TM9-424 6Inch Gun M1900 Barbette M1900

8/16/2019 TM9-424 6Inch Gun M1900 Barbette M1900

1/140

WRDEPIRTMENT

TECHN C 4L

MNUL

T

M

424

Thi s TMsuper sedes OF SB 6 B 16 dat ed 4 Aug 42 andWDT 9 424 1 dat ed 30 Oct 44

Thi s

TMuper sedes

vort i ons of

ordnance

Documents

No 1680 dat ed

1 Mar

18

and

No 1688

dat ed

9 Oct 12 whi ch

appl y t o

t he

mater i el covered i n

t h i s

TIMhowever t hese Or dnance

Document s

r emai n

i n

force

u n t i l i ncorporated

i n

al l

ot her

aff ected

TMs or s p e c i f i c a l l y

r esci nded

6-I NCH

SE CO ST

M TEREL

GUNM1900MOUNTEDON

RRETTE

C RR GEM1900

W4R

DEP RTMENT

rA

RESTRCTED

DSSEMN TIONOF RESTRCTED

M TTER

Noperson

i s

ent i t l ed sol el y by vi r t ue of hi s grade or pos i t i on t o

knowedgc

or

possessi on

of

c lassi f i ed

matter . Such matter

i s

entrusted

onl y

to those

bdi vidual s whose

of f ic ia l dut i es requi re such

knowedge

or

possessi on

See al so

paragraph

236 R380 5

15

March 1944 .

26 IL R H

2945


2/140

WARDEPARTMENT

Washi ngt on 25, D

C

26

March

1945

TM9- 424, 6- i nch

Seacoast

Mat er i el

Gun M1900 Mounted on

Barbette

Car r i age

M1900

i s

publ i shed

f or

t he

i nf or mat i on

and

gui d-

ance

of a l l

concer ned

C

AG 300

. 7

11 Mar 44

r

0 300 . 7/ 737b

BYORDEROF

THE

SECRETARY

OF

WAR

OFFI C AL

J

ULI O

Maj or General ,

The Adj utant Gener al

GC

MARSHALL

Chi ef of

Stag

DSTR BUTI ON AGF 10 ; ASF 2 ;

Dv

ASF

1

; T

of Opns 10 ;

Def

Com 3 ;

Sectors

3 ; Arms

v

B

d

2 ; Tech

v

2 ; SvC 10

; PE

Marked f or OdO° °

S

; Di st

O

5 ;

Di st

Br

O,

3 ; Reg

O, 9 3

;

Decent r al -

i zed

Sub- O,

3 ; Establ i shment s, except Am

3 ;

USMA 20

Ref er

t o FM21- 6

f or

expl anat i on

of di str i buti on

f or mul a.


3/140

ONTENTS

H PTER

5

ORGANZATI ONAL SPARE PARTS

NDACCESSQRIES

70 1d0

83 109

H PTER6 SUBCALI BEREQUPMENT

101 114 109 124

H PTER 7 PREPARATION OF MATERI EL FOR

USEUNDEREXTREMECON D

TIONS

k5 119 125 ?27

H PTER

8

SEACOASTARTI LLERY

PRESSURE

TESTING 120 x

24

128 X29

H PTER

9

REFERENCES 125 128

13 X 133

NDEX

134 136

Paragraphs r aget

H PTER1 I NTRODUCTION 4 1 4

H PTER

2

GUN

ND

CARRI AGE

5 50 5

59

SECTION

I

;

Descri pti on of

gun

5

8

5

11

11

Descri pti on of car ri age

9

18

12

18

I I I

Operat i on 19 25 18 24

I V Lubri cati on 26 28 24 30

V

Mal funct i ons

and corr ecti ons

29

32

30

33

V Care and

preservati on

33 40 33 55

V I I nspecti on andadj ustment 41 49 55 58

V I I Repai r 50 58 59

H PTER3 SIGHTINGEQUPMENT

51

58

60 66

H PTER4 MMUNTION 59 69 67 82


4/140

T

9 424

c

w

c

w

U

w

m

c

c

e

c

m


5/140


6/140

Pars

2 3

3

CHARACTERSTICS

I ntroducti on

2

2 Complete

i nstr ucti ons on

how

o

make ent ri es i n

the Ar t i l l er y

Gun

Book

are

conta ned

t herei n I t i s absol ut el y essent i al

that the

gun

book ent ri es be kept compl ete

and

up-to-date I n order

t o

f ac i l i ta te proper

ma ntenance

of

the

cannon and

i t s rel at ed mat eri el

t hat i s carr i age recoi l

mechani sm

and

associ at ed f i r control

equi p-

ment and t o

avoi d

unnecessary

dupl i cat i on

of

repai rs

and ma nte-

nance the

f ol l ow ng

addi t i onal

entr i es are t o bemade i n thegunbook

a

A

record of

complete

Modi f i cat i on

Work

Orders

Thi s

record

shoul d

showthe date completed and bear the si gnat ur e

of

the

of f i cer

or

mechani c

r esponsi bl e

f or compl eti onof themodi f i cat i on

b ecord of seasonal changes of

l ubri cant s

and

recoi l

oi l i n

suf f i ci ent detai l t o prevent dupl i cat i on and af f ord

proper i dent i f i cat i on

by the

i nspect or

3 Theesti mated accuracy l i f f or

thi s

gun i s 1 250 rounds

h

Fi el d

Report of Acci dents Whenan acci dent

i nvol vi ng

am

muni ti on

occurs duri ng pract i ce the

i nci dent

w l l be reported as

pre-

scri bed

i n

AR 754-10

by

the

ordnance

of f i cer under

whose

super-

vi s i on the ammuni ti on i s ma nta ned or i ssued

Were

practi cabl e

reports

coveri ngma functi ons

of

ammuni ti on

i n

combat w l l be

made

t o the Chi ef of

Ordnance,

gi vi ng the

type

of

mal f uncti on type

of

ammuni ti on,

the

l ot number of

the

complete

rounds

or

separat e l oad-

i ng components, and

condi t i on under which

f i r e d

c Unsati sfactory Equi pment

Report

Suggest i ons f or i mprove-

ment

i n desi gn ma ntenance, saf ety and ef f i ci ency of operati on

prompted by chroni c

f ai l ure

or

ma functi on

of

the

weapon,

spare

parts or

equi pment

shoul d

be reported onWAGO

Form

No

468

Unsat i sf act ory

Equi pment Report,

wth

al l pert i nent

i nformati on

necessary

t o

i n i t i a t e

corr ect i ve

act i on

The

report

shoul d

be for-

warded

t o the

Of f i ce Chief

of Ordnance, Fi el d Servi ce

Ma ntenance

Di vi si on through commandchannels

i n

accordance

wth i nst ruct i on

No

7 on

the

f orm

Such suggest i ons are

encouraged i n order t hat

other

organi zat i ons

may

benef i t I f

W

AGO

Form

No 468 i s not

avai l abl e

ref er

to

TM7-250 f or l i s t of data

requi red

on

Unsat i s-

f actory

Equi pment

Reports

d

Battery

Empl acement

Book ABattery

Empl acement Book

w l l al so be

kept

f or each battery

For i nformati on on care of thi s

book,

and

entr i es

t o

be made

t herei n

ref er

to

TM

-245

a The6- i nch

GunM19

i s

a

manua l y operated

rapi d

f i r

gun

wth

amaximum

ange

of 17, 000 yards at 20

degrees

el evat i on

The

gun

f i r s

separ at el y l oaded armor-pi erci ng

or hi gh- expl osi ve ammuni -

t i on and

i s

norma l y

f i r ed el ect r i cal l y by

means

of an el ect r i c type

pri mer and

a magneto

I f necessary

i t

can

be f i r e d

manual l y

by a

l anyar d

usi ng a

f r i c t i o n type pri mer

Safety

devi ces are

provi ded

to prevent

premature

di schargeof

the gun


7/140

TM

9-424

Pars

3- -4

I ntroducti on

b Arange drum

and

an azimuth c i r c l e are provi ded on the

car

r i age f or di r ect i ng

the gun Both

e l evat i on

and

t raverse

are

mnu-

al l y operated

c The

gun

recoi l s

i n a c radl e

whi ch

carri es the t r unni ons The

recoi l

i s

absorbed

by

spr i ngs

and

a hydraul i c

recoi l

cyl i nder

The

recuperator spr i ngs

re turn

the

gunt o

battery

d The

gun

i s

munted on

a barbett e car r i age Asteel

shi el d

4x/ 2

i nches

thi ck

protects

the

front of

the gun agai nst enemy f i r e

and

bombf ragmnts f i g

1

4 TABULATEDDATA

a

GunM 9

Type

of bar r el

.

Bui l t - up

Type of breech

Lever- pul l

Type

of

breechbiock

i nt err upt ed thread Four - sector par al l el

Cal i ber 6

i n

Length

of

bore-

_

SO

cal

Total

l ength muzzl e

t o

breech

f ace 310

4

i n

Length of barrel

_ _

302

9

i n

Length of r i f l i ng _

254

14 i n

Ri f l i ng or i gi nal

tube

:

Tw st , r i ght - hand, sem- cubi al

parabola

Starts

one turn 50 cal

and

i ncr eases

to

one

turn 2S

cal

Pr i or

to 1918

After 1918

Number

grooves

and

l ands

. 36

54

Wdth

of

l ands . 0 . 15 i n

. 14

i n

Wdth

of

grooves . 4. 3736

i n

. 2091 i n

Depth of grooves 1 1 . 04 i n . 45 i n

Ri f l i ng

l i ner

:

Tw st ,

uni form

r i ght - hand

One t w s t

i n

25 cal

Number

of

grooves

and

l ands 76

Wdth

of

l ands

0 117

i n

Wdth

of

grooves

0 131

i n

Depth

of

grooves

0

05 i n

Wi ght

of bar r el 19,1141b

Range

17, 000 yd

Muzzl e

vel oci ty-

105-pound

proj ec t i l e 2, 804

f ps

108-poundproj ec t i l e

2, 600

f ps

Travel

of

proj ec t i l e i n

barrel

256

. 325

i n

Center

of

gravi ty di st ance f rommuzzl e

210 15

i n

b 1. 457-i nchSubeal i her

Gun

Over - al l l ength

of tube

72. 85

i n

Wi ght of gun

and

adapt er s 138

l b

3


8/140

Par 4 9-424

I ntroducti on

Length of bore

50

cal

Dameter

o£ bore

1. 457 i n

Wei ght

of pr oj ect i l e 1

. 457 l b

Type of

primer I gni t i on 20

gr ai ns

Ri f l i ng

Length 66

. 552 i n

Number

of grooves 12

Twst, uni f orm r i ght - hand

Oneturn

i n

30

cal

e

Ammuni ti on

Armr-percing 105and

108

l b

H gh-expl osi ve

_

90

1b

Chamber

capaci t y 2, 114

cu

i n

Chamber di ameter max 8 i n

Wei ght

of

powder

charge

32

or 37 l b

d Barbette Carri age

Model of 1900

Total weight gun and carr i age

wthout shi el d approx 19

tons

Total weight gun, car r i age, and shi el d approx 45,568

l b

Dameter of empl acement approx __

19

f t

e Recoi l Mechani sm

Type

Hydrospri ng

Number of

hydrau i c

cyl i nder s

1

Ori f i ces

Threegrooves

Buf fer

Dashpot

Recoi l oi l

Recoi l oi l

l i ght

Normal l engt h of recoi l

14 i n

aximum

engt h

of

recoi l

15

i n

Capaci ty of recoi l cyl i nder 3 gal

Number

of

spr i ng cyl i nder s 2

Spri ng pressur e

44,000 l b

f Traverse

Traverse

360

deg

One handwheel

turn 2 . 78

deg

E f f o r t requi red to

traverse

10 l b

Operati on

Manual

g Elevati on

aximum

l evat i on

__

__

20

deg

355

ml s

aximumdepr essi on

Mnus

5

deg

mnus 88 9 ml s

Elevati on f or l oadi ng

10 deg pl us or

mnus 1

deg

177

8 ml s

pl us

or

mnus

17 8

mls

Average

ef fo r t t o el evate or

depress

6

to

8

l b

One

handwheel turn

0. 37

deg

6

6

ml s

Operati on

Manual


9/140

TM9 424

Par

S

5

GUN

BARREL

CHAPTER

2

GUN

ANDCARR AGE

Secti on

DESCRPTION

O

UN

a Thegun

bar r el of

M19

i s of the

bui l t - up type, constructed

of

hoops

j acket,

tube

or

tube wth

l i ner r ecoi l

band and hi nge

pl ate,

and

i s provided wth two keys or r i bs tQprevent rotat i on

of

the

gun i n munt

b The

breech

end of

the barrel i s constructed t o form

a

threaded

recess

i n whi ch the breech bushi ng i s

screwed

e

Thebreech bushi ngact s as the l ocki ngmember f or thebreech-

bl ock

d The hi nge pl ate i s provi ded wth tugs f or the

breechblock

car-

r i er

hinge

pi n

e The r ecoi l band - at the breech end of the barrel has a l ug t o

whi ch the r ecoi l

pi ston

rod i s attached Thi s rod carr i es ayoke t o

t he

ends

o

whi chthecount err ecoi l

spr i ng

rods

ar e

bol ted

f

The

tube

i s bored t o

form

chamber and bore Theseat f or the

gas check pad i s at the rear of the powder chamer The

powder

chamer at the f r ont narrows

t o

form

he

cent eri ng sl ope which

gui des

the

proj ect i l e

i nto the

f orci ng

cone The f orc i ng

cone

i s tapered t o

gui de

the proj ect i l e

rotat i ng

band i nto the

r i f t i ng

The bore i s

r i f l e d

throughout

g The

tubes

f or

M19

have

an

esti mted

l i

of

800

rounds

On

guns

havingthe

ori gi nal tube not

r el i ned , the

r i f l i ng

i s sem - cubi cal

parabol a

and not

uni form

On

guns

whi ch

have

been

r el i ned,

t he

r i f l i ng

i s usual l y

uni form

h

I n

cases

where the

seats f or thegas check

pads have been

en-

l arged, a

mrki ngpl ace i s f astened

t o

the hinge

pl ate, which states

the

extent of enl argemnt

i n si ze

and

the advance of the

gas

check

seat i n

the t ube, Theseguns r equi r e

speci al ri ngs, gas check

pads, and

spi ndl e

di sk,

and som

may

be

found

to have an enl arged obturator

spi ndl e

i The breech hinge pl ate i s

stamed wth

t he

mdel of gun,

nam

of

mnufacturer

and

year

of

mnufacture

The

mzzl ef ace i s mrkedwth themdel of

gun, nam

of

mnu

facturer, and year of mnufacture Theweight of the coml ete gun

i s i ndi cat ed and i i t has been

r el i ned,

the year of

rel i ni ng

i s

mrked

The mzzl e f ace i s scoredwth w t ness ti nes

f or

use of themzzl ebore

si ght

duri ng

or i ent at i on of thegun

5


10/140

Par

5

T I L

9 4 4

Gunand

Carri age

Fi gur e

C osedReady o F i re

R

PD39858

Figure

3

Cl oset

Posi t i on

C ose up o Segment

Gear


11/140

TM9 4 4

Par

Gun

and

arri age

Figure

4

Segment

Gear Rot at i ng Cl ose up

PID

9959

RAPD

9856

Fi gur e 5

Tooth

an Operat i ng

Lever

Gear

Pushi ng

reechbl ock


12/140

Pars 6-7 TM9-424

Gun and Car r i age

6

BREECH

MECHANSM

M 9

f i g s

2

and 3

a Thebreech mchani sm s of the l ever- pul l type w th a f our-

sector

i nt er r upt ed

par al l el threadbreechbl ock Whenthe breechbl ock

i s opened bythe operati ng l ever three operat i ons are

performd

1

The f i r s t

mvement

of

the

l ever

f i g

4

rotates

the

breech

bl ock unti l stopped

by the breechbl ock

stop

At the sam

ti m

the

f i r i ng mchani sms l i de i s movedaway fromthe f i r i ng l ever thus pre-

venti ng the guri

f rom

being f i r ed when the breech i s not l ocked

At

thi s

poi nt

the threadedsectors of thebreechbl ock ar e

disengaged

from

the

threaded

sectors i n the breech bushi ng

and

the

tr ans l at i ng

teeth

of the pi ni on start t o engage

the

t rans l at i ng teethonthegear

segmnt

f i g

12

2

Further

mvement

of the

l ever

draws

the breechbl ock

t o

the

rear unt i l the stop f l ange

str i kes the

bottom

of the

stop groove

i n the

carr i er f i g 5

As the breechbl ock reaches the

end of t r ans l at i on

t o

the rear the i nner end of the

l at c h bol t

sl i des down the

i ncl i ned

groove

on

thebreechbl ock

pal l et and

the

outer end of

the l atch bol t

i s

wth-

drawn

from

the

l atch

bol t

seat

f i g

13

3 Conti nui ng the pul l on the

l ever

draws the breechbl ock

car-

r i er

away from

the

gun f i g

14

and

as the

l at ch l ever

cl ears the

t r i ppi ng stud the l atch bol t

i s f orced by

the l atch

l ever

i nto the

wel l

i n the br eechbl ock l ocki ng the

breechbl ock

t o t he

carr i er

b To

Cl ose

the

Breech

1 Gaspthe handl e of the

l ever

and swng t o the l e f t and for-

ward as

f ar as

i t

w l l

go

whi ch

i s par al l el t o

the breech f ace

of

the

carr i er

2

The

f i r s t

mvement

swngs the

breechbl ock

carr i er

agai nst

the

f ace of the breech

3 As the

car r i er st r i kes

the f ace

of

the gun the

l atch

l ever i s

f or ced

i n

by the t r i ppi ng

st ud

whi ch draws the l at c h bol t out

of

the

wel l and

un ocksthe breechbl ock

from

the carr i er

4

Conti nued

mvement of the

l ever

t r ansl at es t he breechbl ock

forward

unt i l i t i s stopped by the breechbl ock stop The forward

mvemnt of thebreechbl ockcauses the i nc l i ned sur f ace of the breech-

bl ock pal l et t o f orce

the

l atch bol t

outward and i nto

the l atch

bol t

seat l ocki ng

the car r i er t o the f ace of the

gun

5

The

f i nal mvement of the l ever

forward rotates the

breechbl ock

unt i l

the

breechbl ock

stop l ocks

i t

i n

the

f i r i ng

pos i t i on

f i g

2

6 The

l ever mvement which opens or cl oses

the breech

i s one conti nuous mti on

7

OBTI LTRATI QN

a

Obturati on i s the seal i ng of the breech t o

prevent

the escape

of

comusti on

pressure

to

the

rear


13/140

TM9-424 Par

Gun

andCarri age

REAR

SPLI T

R NG

FRONT

SPLI T RNG-- -- X=

GAS

CHECKPAD

FILLING

I N DSK

INNER

RNG

OSTURATORSPINDLE

NO

COMBUSTION

PRESSURE

SPACE

EXAGGERATED)

Fi gur e Qbturator i n

Normal Posi ti on

h When the breech i s

cl osed

the gas

check

padand steel s p l i t

r i ngs

enter the s l i g h t l y taperedgas

check

seat - i n

the

barrel f i g

When the gun i s f i r e d the obturator

spi ndl e i s

f or ced

back by

the

pressure

of

the expand ng

gases

thereby compressi ng the

gas

check

pad and expand ng the

spl i t

r i ngs

f ag 7 Thi s acti on

ef f ect i vel y

seal s

the

breech

Af ter f r i n g the

spl i t

ri ngs

and gas check pad

resume

thei r

ori gi nal

posi t i on and

the

breech may

be

opened A

smal l

spl i t r i ng i s al so used to seal the obturator spi ndl e hol e i n the

gas checkpad The

f i l l i ng- i n

di sk serves as

a

beari ngwasher to

e l i m

i nate

f r i c t i o n between

gas checkpadandbreechbl ock

Thi s

i s

neces-

9

RAPG

95214


14/140

ar

OBTURATOR SPINDLE

MOVES

BACK UNDER

COMBUSTI ON

PRESSURE

COMBUSTI ON

PRESSURE

R NGS EXPAND

AT

SPLI T

N

PAD COMPRESSES

SEALI NG

SPACE

Gun

and

Car r i age

Fi gur e 7

Obt urat or

r

F ir ing

Posi ti on

sary as the

breechbl ock rotates

whi l e

the obturator spi ndl e whi ch i s

keyed t o the breechbl ock carr i er does not

c

entral

bore

i n

the

obturator

spi ndl e

form

a chamber f or

the pri mer and

a

vent f or the pri mer

f l ame

Threaded holes i n the

mushroomheadof the spi ndl e areused t o attach

pl ugs used i n pressure

testi ng

and

are

pl ugged w th

screws

t o prevent burn ng

the threads

when

pressure pl ugs are not used Holes are al so

provi ded i n the

head f o r

a

spanner

wrench

whi ch i s someti mes necessary

f or

the

removal of the obturator spi ndl e

1

TM9 424

R PD

95129


15/140

TM9-424

Pars 7- -8

Gri n

and

arr i age

Fi gure

8

Fi r i ng

Ci rcui t Wri ng

Dagram

8

FIRNGMECHANSM

RECOL FIR NG

CONTACTORX

GROUNDON

GUN

PRMER

FUZE

CRCUTBREAKER

ON REE HX

RAPD95157

d

The spi ndl e f i g 20 has anannul ar

groove

wh chengages the

yoke of the f i r i ng mchani sm

o

hol d the l atter

i n

pl ace Sack of the

groove the spi ndl e i s threaded to take the spi ndl e nut wh ch hol ds

the spi ndl e bal l washer i n pl ace

a The

f i r i ng mchani sm f i g

22

f or theGunM 994

i s

i ntended

f or

use

wth

ei t her

el ectr i c or f r i c t i on pri mrs

I t

consi sts

of the

f o l -

l owng

parts

f i g

40 sl i de sl i de

cat ch

sl i de

housi ngyoke

pi n

ej ector

f i r i ng

l e a f ,

contact

c l i p ,

saf et y

bar

f i r i ng

cabl e ci rcui t

breaker

contact

ci rcui t breaker

housi ng and

ci rcui t

breaker housi ng bracket

b Thegun

cannot be

f i red unl ess

the breech

i s

f ul l y

cl osed and

l ocked

] . I t cannot

be f i redwth

the l anyard f or

as soonas

the

breech-

bl ock

starts t o r ot at e

i n cl osi ng

the

saf et y

bar

enters

the groove

i n

the

si de

of

the

f i r i ng l eaf

preventi ng mvemnt of the l eaf to the rear

2

I t

cannot be

f i red

el ectr i cal l y

because

the f i r ing

ci rcui t

i s not

coml etedunti l the

breech i s f ul l y cl osed and l ocked

3 The pri mr wh ch reseml es

a blank

r i f l e

cart ri dge

wth a

knob-ended wre protrud ng from

the base i s

i nser t ed

i nto primr

chamer

of the

obturator

spi ndl e

4

Wen

f i r i ng by

l anyard the f i r i ng l eaf i s pul l ed backand

pul l s

the wre of thepri mr rearward Th s act i on f i r e s the f r i c t i onpri mr

Wen

f i red

el ectr i cal l y the cl osi ng of thebreechcoml etes the circui t

andthepri mr mrel y awai ts

theel ectri cal i mul sefromhe

mgneto

c

Fi ri ng i rcui t Thegun i s

f i red

el ectr i cal l y by the

mgneto

wh chi s muntedon the t raversi ng handwheel bracket


16/140

Pars

9-10

Thk

9-424

Gun

and

Carri age

9 GENERAL

ec t i on

DESCRI PTI ON OF

CARRI AGE

a Emplacement

The

Barbette

Carri age

M 9

i s

i nstal l ed

i n

a

preparedconcr et e

emplacement

wth

a

rai sed

center ,

of

such

desi gn

as t o

permt

t he recoi l

mechani sm

o cl ear t he

emplacement

at extreme

el evat i on f i g 1)

b Pedestal

The

pedest al , whi ch i s t he

stati onary

foundati on f or

t he pi vot yoke

i s

bol ted t o theconcrete emplacement

Thet raversi ng

wormwheel

andazi mth ci rcl e

aremuntedon

i t f i g

1)

c

Pi vot

Yoke The

pi vot yoke whi ch supports the

cradl e i n i t s

trunni on beari ngs,

rests ona

rol l er thrust beari ng i n

the

cent er of the

pedest al

and i s

balanced

byabronzebushing

at

the top and bottom

of

the

pedest al

d

Recoi l

Mechani smand

Cradle

The

recoi l

mechani smand

cradl e

consi st of

the

f ol l ow ng

asseml i es

Thecradl e,

a l arge

casti ng

i n whi ch the

gun

sl i des f or recoi l

and

counterr ecoi l

the

cradl e t r un-

ni ons andbeari ngs f or

el evat i ng

or depr essi ng thegun the el evat i ng

rack f or the

cont r ol of

el evat i on

or

depressi on

; the recoi l

cyl i nder

f or

sl owng the

gun

t o a gradual

stop i n recoi l

and

counter r ecoi l

;

andthe

r ecuper ator

spr i ngs

f or slowng

the gun i n recoi l

and

returni ng

the

gun t o battery i n count er- r ecoi l

e

Elevati ngMechani sm El evati on or

depressi on i s bymnual ly

operated handwheel

f i g

9

The

el evat i ng mechani sm s munted

on the

l e f t s i de of the yoke The carr i age i s

el evat ed throughaworm

wormwheel

and

pi ni on gear operati ng

on

the

el evat i ng

rack,

whi ch

i s

munted on the cradl e to

el evat e

or depress the gun

The

true-

ni ons are

si t uat ed

at the

cent er

of

gravi t y

to

balancethe

gun

and so

el i mnate theneed f or abrake

f Traversi ng

Mechani sm The

car r i age i s

traversed

mnual ly

f i g

10 through a

worm

wormwheel

and pi ni on

gear

t o

the trav-

ersi ng wor rnwheel

on the

f ace

of

the pedestal

The t raversi ng

handwheel

i s

m. j nted

on

t he r i ght

s i de

of

the car ri age The car-

ri age may be traversed

conti nuousl y

through

360 degrees 6, 400

mls In

some

cases, stops are

employed on

i ndi vi dual

guns

af t er

emplacement

t o

l i m t

the

f i e l d of

f i r e

g

El ectri cal

System

The

el ect ri cal

system

consi st s

of

the

l i ght-

i ng

ci rcui t and the

f i r i n g

ci rcui t

10 PEDESTAL

a

The pedest al

f i g

1 i s

i n

the

general

f ormof

the l ower part

of

a cone,

termnati ng

wth

acyl i ndr i cal

upper

secti on

and

a f l anged

base,

whi ch

i s d r i l l e d f or

munti ng

bol t s

Four

covered mnholes

12


17/140

TM9-424

Pars

10-12

Gunand

Ca

r r i age

are

provi ded f or

cl eani ng the

i nt eri or and

t o gi ve

access t o the 360

degree el ect ri cal contact - r i ng

The

j oi nts between manhol e covers

and

pedest al ar e kept water t i ght

by

means of gasket s

1 The extensi on

of

the cyl i ndri cal

part i s

f i ni shed to form

a

seat f or the t r aver si ng

wormwheel

2 An annul ar

boss

i n

the

bottom

of

the pedest al

form

a bear

i ng f or the l ower end of the pi vot yoke

The

upper

cyl i ndri cal part

of

the

pedest al ma nta ns the pi vot yoke i n a ver t i cal pos i t i on

3 Thewei ght of the revol vi ng par t s i s supportedby a pl ai n

rol l er

t hr ust

beari ng

between

the pi vot

yoke

andthe

annul ar bore

onthe

pedestal

base

11

PIVOT

YOKE

a The

pi vot yoke

has two vert i cal prongs whi ch

bear the t run

n on

beds f or

the

trunni on beari ngs

and

cradl e

The

shi el d suppor t s

are

f i t t ed

i nto f i ni shed recesses i n

the

outer f aces of the

prongs

These

supports

are

al so

bol ted t o

the

prongs

of

the

pi vot

yoke Annul ar

pr oj ecti ons onthe pi vot yoke

prevent

entryof water i nto

the

pedest al

bear i ngs

The

ends of the cored

hol e

i n the stern are cl osed wth

pl ugs

The

t r aver si ng gear caseand

the

platformbracket s are bol ted

to

theprongs Twooi l hol es

are provi dedi n thepi vot yoke

f or oi l i ng

the

upper pedest al

beari ng andan o i l pi pe l eads

from

a

t hi r d

hol e

to

the t hr ust beari ng at

the

l ower end of the pi vot

yoke

12 RE OL

ME H NSM ND

R DLE

a Crad e

The

cradl e i s

bored

to

r ecei ve

the gun O l

grooves

i n l i ners

connected

t o

si x

oi l hol es

i n

the cradl e andtwo i n

the

f r ont

l i ner

i nsur e

proper

l ubr i cat i on Near

the

f r ont

endar e

the

el evat i on

trunn ons

whi ch are

supported

i n

the pi vot yoke

On

the

top

of the

cradl e

i s

a

l i f t i ng

r i ng

The shoulder

guards and

el evat i ng

rack are

attached

t o the cradl e

Underneath

the

rear port i on

and

formng

part

of

the

cradl e are the

recoi l

cyl i nder

andtwo

recuperator spr i ng

cyl i nders

b

Recoi l

The

r ecoi l cyl i nder

holds

3 gal l ons of

oi l

t

has

a

l i ner cap whi ch i s screwed to

the

l i ner i n whi ch three

throt t l i ng

grooves

are

cut

The l i ner

and

l i ner

cap

ar e held i n pl ace

by

the

rear

cyl i nder head

count err ecoi l

buf f er i s provi ded

i n the f ront

end

o£

the

recoi l cyl i nder

The rear

end

of

the

cyl i nder

i s cl osed

wth

a head

i n whi ch

are f i l l i ng

and

dra n hol es f i gs

41

and44

cl osed

wth

screw

pl ugs

and

the

stuf f i ng

box

wth

i t s

gland

and

f ol l ower

The

pi ston

consi st s

of a

l i ner

screwedon the

f r ont end

of

the

pi ston r od

whi ch

i s attachedby

f r ont

and

r ear nut s t o the

recoi l

band

f i g

42

The

recuperator

spr i ng yoke i s carr i ed on the pi ston

rod

i n r ear of

the

r ecoi l band and i s

secured

between

rear

nut and

band

13


18/140

Par

Gunand

Carri age

TM9 424

Fi gure 9

Range arumand

El evat i ng

Handwheel

M 9

RA

P[ 1

39896

e Recuperati on

The

recuperator spri ng cyl i nders

areprolonged

to

the rear by extensi ons

and i n each i s a spri ng rod the rear end

of

wh ch i s

attachedt o a yoke secured

i n the

rear

of the recoi l band

f i g 42 The

head of each spr i ng

rod rests

on

a

col umn of f our

spr i ngs wh ch

are

rested

i n

the

spr i ng

cyl i nder

The

. t wo

smal l er

ones

are

carr i ed

i n

a st i rrup

t hat

t el escopes

wthi n the ext eri or two Each

of

thetwo

spr i ngs

of

the

sam

d amter

i s

partedby

a

separat or

The

l ength of

the spri ng rod

shoud

be

adj usted

f i g

43

so as

to return

the gun i nto battery at

the maximum

angl e of

el evat i on

wthout

shock

but

i n no

case

shoudthe head

o the rodprotrude

f romthe

front

end

of the cyl i nder wh ch

i s open

d

Recoi l

andCounterrecoi l

System The acti on

of

t he gun

i s

as f o l l ows

Wen

f i red

thegunr ecoi l s t o

the rear about 5

i nches

i n

the cradl e

car r yi ng wth

i t the

recoi l pi ston and

recuperator

spr i ngs

rods ; t her eby

comressi ng the

recuperator

spr i ngs

mal l port i on

of

the

energy

of

the

recoi l

i s

absorbed

i n

comressi ng the

spr i ngs

but the

greater port i on

i s absorbedby the

resi stance

wh ch

the

l i qu i d

offers

to bei ng f orced

through the openngs

formd bythe

thrott l i ng

grooves

Thedepths of the

grooves are

proporti oned so that

the

areas of the

openi ngs vary ng wth the

posi t i on

of

the pi ston duri ng

recoi l

w l l be such

as

to produce

a constant

resi stance

assi sted by

the recuperator

spr i ngs throughout

the l engthof

recoi l The

counter

14


19/140

TM

9 4 4

Pars 12-13

Gun

and

Car r i age

Fi gure

10

Traversi ng

Wrm

Housi ng

M

900

recoi l

buf f er

or plunger

i s

tapered t o provide resi stance to control

the

moti on

of the gun duri ng

i t s

return t o battery and f i nal l y bri ng

i t

t o

rest when

the

pi ston

reaches the

f ront

end of the

cyl i nder

13

ELEV TING

MECH NSM NDR NGE RUM i g

9

a El evati ng Mechani sm

n el evat i ng

br acket

bol t ed

t o

the

l e f t

pl atform

br acket cont ai ns the el evat i ng

gear

Bymeans

of

the

el evat i ng

handwheel

movement

i s

commun cated

t o the

cradl e

through

act i on of

the

pi ni on

on the el evat i ng

rack The

el evat i ng

wormwheel

i s

assembled

between two other di sks

whi ch

bear on

i t s

si des

i n such a

manner t hat

the pressure between the

wheel

and

di sks

my

be vari ed by

means

of

a

nut on the outer end of the

el evat i ng pi ni on

shaf t

Thi s nut shou d be

ti ghtened suff i c ient l y t o

provide

enough f r i c t i o n to enabl e the gun t o be el evated

and yet

permt sl i ppage

bef ore any

i nj ur i ous

s t rai n i s brought uponthe

el evat -

i ng

wormwheel

and

worm

Nne hundred

pounds

appl i ed

at

the

muzzl e shou d

s l i p the f r i c t i on

b Range

Dumf i g

9

The range drummechani sm

rack i s

bol ted t o the upper end of

the el evat i ng rack and meshes wth the

pi ni on Moti on of

the pi ni on rotates the drum t o the

out er cyl i n-

dri cal sur f ace of

whi ch

the

graduati on r i ng i s attached

pri ng

I s

R

PD39900


20/140

Pars

13-14

Gunand

Carri age

14 TR VERSING

ME H NSM

T L

9-424

keeps

the f ace

of the pi ni on teeth i n

contact wth those on the

rack,

thus el i mnat i ng backl ash

1 The i nner edge

of

the

r i ng i s

graduated

i n

yards

f or sub

cal i ber range,

the outer edge i n yards f or servi ce

r ange, and

between

these

two

scal es the

r i ng

i s graduated

i n degrees of

el evat i on

The

degree

marks

on

the

el evati ng

scal es

are

determned

by

the use

of

a

cl i nometer

supported

by a

zest

pl aced i n the

mzzl e of the gun

af ter gun

i s

mounted

upon

the

car r i age

NOTE Somerange

drum

have

beenmod f i ed

so that cal i brat i on i s i n ml s

Wenso graduated

hei ght of s i te

does

not af f ect

scal e

2 As the ranges correspond ng

t o

di f f erent

angl es of el evati on

above the hori zont al

depend

upon the

height at whi ch the gun

i s

mounted above

sea

l evel ,

the

range

scal e

mst

be graduated

af ter

mounti ng Thi s shoul d never

be

done

except ti nder the super vi si on

of t he

Ordnance

Departmnt

3 range poi nter

i s

attached t o therange drumbracket and

a shoul der

guard

i s

attached to

the

cradl e

and

spr i ng cyl i nder

head

a The tr aversi ng mchani sm s

l ocat ed on the

ri ght

si de of the

pedestal

Si x

oi l hol es

are

provided

f or

o i l i ng the beari ng of

the

t raversi ng

wormwheel through

the top

of the pedestal The travers-

i ngwormwheel

i s

encl osed

i n a two part gear

case

andbol ted t o the

pi vot

yoke

f i g 10

b Beneath the wormwheel i s the

f r i c t i o n band

The

f r i c t i o n

be

tween

the

f r i c t i on

band

and

wormwheel i s ad usted t o enabl e

the

gun

t o be traversedwthout sl i ppi ng

and

yet permt sl i ppi ng i n case

undue

strai n

i s

brought

on

the

teeth

of

the

wormwheel

c

The

tr aver si ng

wormshaf t i s asseml ed

wth

i t s worm n the

t raversi ng

gear case

i n f ront of the pedest al f i g 10 At both si des

of the worm t i s

supported i n bear i ngs

f ormd

by the tr aver si ng

gear case and cover Two

bal l

thrust beari ngs, encased

i n

col l ars,

bear on ei ther

si de

of the tr aversi ng wormand transmt the thrust

to the worm

casti ng

Concave and convex washers are provi ded

between

t hewormcasi ng and the

bal l

beari ng

t o equal i ze the thrust

Between

the

bal l

beari ng thrust col l ar and the tr aver si ng

worm

shaf t

i s a

spl i t col l ar and

a

spl i t

thrust col l ar

nut

ny

excessi ve

end

pl ay

maybe takenup

by

the thrust col l ar nuts

Theazimth

c i r c l e

i s

bol ted to the

base of

the pedestal

wth the

ver ni er

and poi nt er

attached t o

and

tr aversi ng

wth the pi vot yoke f i g 11

d

Near

i t s rear end,

the t raversi ng shaf t

i s supportedby abeari ng

attached

t o

the

shoul der rest

Onthe

rear

end

of thi s

shaf t

i s

the

tr aversi ng handwheel

e

Wennecessary

to control

amount of

traverse

f or

any

part i c-

ul ar eml acemnt,

traverse stops bol ted t o

the pedest al

l i m t

the

16


21/140

TM

9-424

P

a r s

4 15

Gun

andCarri age

Figure

T

Traversi ng Verni er

M

900

RA

P ] 39899

t raverse

r i ght

or

l e f t

by

cont act i ng the stop armbol t ed to the l ower

s i de of the l t

pl atformbracket

f Shoulder guards arebol ted

t o cradl e and

spr i ng

cyl i nder

heads

on

each

s i de of the

gun

t o

pr otect gunners

f rom

nj ur y dur i ng r ecoi l

and

count er r ecoi l

g

houlder

rest

i s attached

to

the pl atformbracket

on

the

r i ght ( t r aver s i ng) s i de of

the

gun

15 LGHTNG

SYST M

a Thecurrent f or l i ghti ng

i s

obtained fromt he empacemnt

mins

through

a

leaded and

armred twn

conductor cable

whi ch

ent er s

through the bottom

of

the pedes t al

Contact cl i ps

connected

t o

the

two

wres transmt

the current

to

two

cont act r i ngs attached

t o

the pi vot

yoke

thus permt ti ng

themunt

to be

t raversed

360

de

grees

From

hese

r i ngs

t he

power

i s

di st r i buted

t o

8- candl e

power

l amps

one at

the

azimth i ndex and the other

at

the

range scal e

and

t o

2 candl e

power

l ams on thet el escopi c

si ght, one

t o

i l l umnate

the

cross

wres and

one

to

i l lumnate the def l ecti on scal e

there

i s

al so

an engi neer s

pl ug

box

do

t he

t op

of

the

l e f t pl at f or m

br acket

f or

a

portable

lamp

A l lamps

are

11

. 0

vol ts

or

22

vol ts

depending

onthe

voltage of the

empacemnt


22/140

Pars

15-19 TM9-424

Gun

andCarri age

b

The

current

t o the 8 candl e

power

l amps

i s

contr ol l ed

by

124-ohm

r esi st ance

tubes

f or

11 1-vol t ci rcui ts and by 269-ohmre-

si st ance

tubes

f or the

220- vol t ci rcui ts

the

current

t o the

2- candl e

power l amps by 410-ohmresi st ance tubes

f or

the

110- vol t

ci rcui ts

and

by

889-ohmr esi st ance tubes f or the

224- vol t

ci rcui ts

e

The

azi mth

and

el evat i on

l amps

are

contr ol l ed

by

the

water

t i ght

sw t ch l ocat ed

on the

out si de

of the

l e f t

pl atformbracket

The

si ght

l i ght

cabl es are spl i ced t o the end of

a three-conductor cabl e

at

the

other endof whi ch i s ar ecept acl e pl ug to f i t i nto a

wat er t i ght

r ecept acl e pl ug box

The t el escope

i s

provi ded

w th a mechan cal

di mmer

bywhi ch any

desi r ed i l l umnat i on of the cross

w res maybe

obtai ned

16

SHELD

N

SUPPORTS

a

The

cyl i ndr i cal shi el d of the

4

/ 2-i nch

armor pl ate i s mounted

wth i t s

axi s

i ncl i ned 40

degrees to the

hor i zont al i n

order

to provi de

def l ecti ng

sur f ace to enemy

f i r e

I t

weighs

10 418

pounds

and

i s

pi ercedwthagunport and

two

si ghti ng

hol es

The

si ghti ng hol e on

the

l e f t si de

was

used

when

the

mount

was equi pped

wth

a t el escopi c

si ght

on

each si de

Thel e f t

si ght

has

been

d scarded

The

shi el d

i s

attached t o the

si des

of thepi vot yokeby

two

supports

17 GUNNERS PL TFORMS

a Pl atform f or the gunpoi nter and

setter

are

mounted on

each

s i de of

the gun

18 LO DNGTR Y

a I n cases when hand l oadi ng i s

undesi r abl e the l oadi ng tray i s

used

ec t i on

OPERATION

19

PREP R TI ONFOR

FIRNG

a

Bore

Cl eani ng and

Inspecti on Remve t he breech and

muzzl ecovers

i nspect

bore

andchamber

t o

be

sure

no f orei gn mate-

r i a l

has accumul ated

I f di rt y

cl ean wth

dr y- cl eani ng

sol vent

and

wpe

dry

Normal l y, the bore and chamber should be

wped dry

or

cl eaned

t o

remove

the

coati ng

of

oi l

appl i ed

after

the previ ous

f i r i ng

b

Breech

and

Fi ri ngMechani smnspect i on

Open

and cl ose

the breech and

noteacti on I f

operati on

i s

s l uggi sh or

s t i f f determne

cause

and correct

condi t i on

par 29 Wth

the breech

cl osed pul l

dowy the

f i r i ng

s l i de

l atch

bol t

and move the

s l i de t o be sure i t


23/140

TM9-424

Par 19

Gan

and

Carri age

19

RA PD

39 64

Fi gur e 12 Operati ng Lever Pul l ed To Turn Breechbl ock

operates f reel y Thebreechbl ock andbreech r ing threads

shoul d

be

cl ean

Wpe

the gas check pad, cl ean and appl y a t h i n f i l m of

i l

as pr escr i bed by

W O

-424

r Ul ectr i cal Contact Check Before f i r i n g

check

completeness

of the f i r i n g

ci rcui t

The cir cui t mybe

tested

wth

a test l amp or

by f i r i n g a pri mer par

49)

d

mmn tion

Preparati on

1)

Pr o j ec t i l es t o

be

f i red

shoul dbe prepared beforehand

par

65)

and

pl aced

i n

racks provided

2) Veri fy t ype

wei ght

and

l ot

number

of

pro jec t i l e

3) Remverope grommet

and

i nspect

ro ta t i ng

band Remove

any

burs wth f i l e

4) Wpe pro jec t i l e wth cl ean dry wpi ng c l oths

I t

i s i m

portant

that

proj ect i l es be

perf ect l y

cl ean and

free

of sand and

di rt

5)

Pro j ect i l es

equi ppedwth

base detonat i ng

f uzes w l l normal l y

be recei ved fuzed

f or

f i r i n g

Pro j ect i l es

equi pped

wth

poi nt det o

nati ng f uzes w l l

be

normal l y recei ved unfuzedandw l l be

fuzed

as

requi red

i n

the

. f o l l o w n g

manner

:

a) Remvethe eyebol t l i f t i ng pl ug f romthe

pro jec t i l e Do not

remove eyebol t

unt i l

fuze i s t o be

i ns tal l ed Theeyebol t pl ug i s

pro

vi ded

as a l i f t i ng devi ce andal so as a

pl ug

to

keep out f orei gnmatter

b) I nspect f uze

cavi t y andthreads

They

shoul d be

f reed of any

f orei gn

matter that

coul d

i nterf ere wth the

proper

assembl y of

the

fuze


24/140

Par

19

TM9-424

Gun

and Car r i age

RA

PD

39861

Fi gur e 13

Operati ng

Lever Tr ansl at i ng

Breechbl ock

c

I nsert the f uze, bei ng car ef ul that

i s

i s

f i t ted w th

i t s

f e l t

or

rubber washer, and screw

i t

i n by hand

d) Screwup the

f uze

wth the fuze wench, but wthout usi ng

force

e)

I f there any di f f i cul t y i n screwng i n the

f uze, i t

shou d

be

remved

and

another

one

i nser t ed

I f

the

sam

troubl e

i s

ex-

peri enced w t h a second f uze, the

shel l shou d

be rej ected

f

Set

f uze

t o

DELAY

or

SQ superqu ck) as

di rect ed

and

descri bed i n

paragraph

66

g)

For f urt her

i nformti onand

i nstr ucti ons

on

ammun ti on,

see

chapter 4

f i

Al l

powder

char ges,

except

the charge f or the next succeed-

i ng round,

wi l l

be kept

i n

thei r

cont ai ners The

powder

charge f or

any

round w l l

not be

brought i nto the gun eml acemnt

unti l

the

precedi ng

round

has been

f i r e d I nstr ucti ons f or

remval of charges

f rom

cont ai ners

and

preparati ons

f or

f i r i ng

are

gi ven

i n

paragraph 65

7) Previ ous t o

f i r i n g ,

each of

the

pri mrs t o be used

i s

t o

be

i nsert ed i n the obturator spi ndl e to

test each

pri mr

f or proper f i t

e

Recoi l

O l

Checki ng Depress

the gun, t o

zero

degree

0

. 4

m l , remve recoi l

cyl i nder

f i l l i ng

pl ug

f i g 44 , and note

i f

the

cyl i nder

i s

coml etel y

f i l l ed

20


25/140

TM9-424

Pars

20-22

Gun and

Carr i age

RAPD39852

Fi gur e

14 greechbl oek

Stort i ng

To Swng on Carr i er

24

TOTR VERSE

a

The

munt

i s traversed

by

turni ng

thehandwheel of

the

mch-

ani sm

on

the

r i ght s i de

Wen t r acki ng, the

gun

poi nt er

wi l l

mtch

the azimuth readi ng f i g 11

wth pl ot t i ng room

suppl i ed data

For

operati on

of

s i ght i ng and

f i r

control

equi pmnt

refer

t o

chapter 3

21

TOELEV TEOR

DEPRESS

GUN

a The

gun i s el evated or

depressed

mnual l y

by

t ur ni ng

the

handwheel

on the l f t si de,

and i s

di r ected fromthe

pl ot t i ng room

t o

the setter by tel ephone

Ater f i r ing,

the

gun

i s

returned

t o

177

. 8 -m l 1f }-degr ee el evat i on, the l oadi ng

pos i t i on

22

TOLO D

a

Spent

Primr Ej ecti on Af t er around

has been

f i red,

wth the

breech

coml etel y cl osed,

r a i se the s l i de catch

by

pr essi ng upward

on

the handl e

of

the catch f i g 15 This mvemnt

of

the s l i de

wi l l

ej ect

the

f i r e d

primr

b

Breech

Openi ng Gaspthe breech operati ng l ever

and pul l

i t

out of l at ch

Pul l

l ever

to

rotate breechbl ock f i g 12

and

con

ti nue themti onto

swng

the

bl ock cl ear of

thegun

f igs

13

and 14

Hol d the breechopen

t o

the f u l l

ext ent t o

prevent

i nt er f er ence wth

the operati on

of

l oading

21


26/140

Par

22 TM

9-424

GunandCarri age

R

P1

39864

Fi gure 75

Openng

Fi r i ng Mechan smSl i de

To

Remove Pri mr

e

Proj ect i l e

Rammng The

proj ecti l e

brought up

t o the

gun

and

pl aced

i n the chamber

cl ear of

breech

sectors

hand

l oadi ng or

on

the l oadi ng

tray

wth

the rarnmr

head

at

the base of the

pro

j ec t i l e The rammer

then dri ven smrtl y

forward

to

seat

pro

j ec t i l e

securel y

i n the f orci ng cone

d

Powder

Charge I nserti on As the

proj ecti l e

bei ng

rammd

home

the

prepared powder

charge

brought up pl aced

wth

the

i gni ter

pad

dyed

red

to

the

rear

and

pushed

hom

i nto

the

chamber

e Breech

C osing

Cl ose breech by means of operati ng l ever

reversi ng the

operati on

descri bed

i n

subparagraph b above Make

cert ai n

the

l ever

i s

l at ched

i n

posi t i on

Primer

I nserti on

Af ter ej ecti on

of

pr i mer

cl ean

vent and

seat

wth

primr seat cl eani ng brush i nsert newpri mer and

drop

s l i de down

f ar

enough

to permt

s l i de catch

to engage the

notch

i n

thehousing Thebreech then

openedand

the

obturator spi ndl e

mushroomhead

swabbed

wth

wpi ng

cl oth dampenedwth

cl ean

water


27/140

TM9-424 Pars

2

3-24

Gun

and Carri age

23 TOFIRE

24

TO

UNLO

Fi gur e 6 Tr aver si ng

Mechani sm

a

El ectr i cal

Fi ri ng

The

gun

wi l l be f i r ed el ectr i cal l y by operat -

i ng the magneto l ever except i n the case of power

f ai l ure or a

broken

f i r i ng cir cui t

b

Manual Fi ri ng

To

f i r e manual ly,

usi ng f r i c t ion pri mer a l an-

yard i s

attached

to

the

l anyard l oop

on the f i r i ng

l ever

and the

l anyard pul l ed wth a qui ck strong

pul l

not

a

j erk

c

M s f i r e

I n t he

event of a m s f i r e

f ol l ow the

procedure

pre-

scri bed

i n paragraph

29 a

observi ng

the f ol l owi ng

precaut i ons

1

Keepthe

gun

poi nted at the

t ar get

or

i n a

cl ear

f i el d of

f i r e

2 Al l personnel must keep

cl ear

of the l i ne of f i r e

and

the

path recoi l

at

a l l

ti ms

duri ng

ms f i r e

procedures

3

L l s e

the

butt erf l y

net i mprovi sed when removi ng

the

pri mr f romthe

f i r i ng

mchani sm

a

Servi ce Rounds No unloadi ng devi ce i s provi ded wth th is

materi el f or use i n unloadi ng

servi ce

rounds of

ammuni ti on When i t

i s desi red to unloadthe pi ece the proj ect i l e

may

be

f i r ed

out of

the

gun

af ter

i t has been determned that the f i el d of

f i r e i s

cl ear

proj ect i l e canbe removed

by applyi ng an i mprovi sedunloadi ng head

23

TRAVERSI NGH N WHEEL


28/140

Pars

24-27

TM

9-424

Gunand

Carri age

t o the

ogi ve of the proj ect i l e

The

head

however, must have an

out-

si de

d ameter

of 5

/ s

to 5

3

/ 4

i nches

and a

central

open ng

at

l east

334

i nches

i n

d ameter and

6

i nches

l ong

to

cl ear the poi nt - det onat i ng

f uze

b

DummAmmuni t i on The dumm

proj ect i l e

my be ex-

tracted

by

i nsert i ng

the

hand

extractor

through the

hol e

i n

the

base

of

the

proj ect i l e

and pul l i ng i t

back

qui ckl y t o r el ease theband

from

the chamber

f orc i ng

cone

Push proj ect i l e forward

and repeat i f

necessary

Wthdrawproj ect i l e

from

gun

25

AFTERFIRNG

a Cl ean and o i l bore and breech

mechani smas descri bed i n

paragraph 35

b

C eanand l ubr i cat e

al l t ool s and accessori es used i n f i r i ng

c

Repl ace

covers

f or

di rect f i r e

si ght s gun

muzzl e,

and breech

d

Return unused

powder

charges t o

ori gi nal cont ai ners and

wrappi ngs

Mark cont ai ners

so

t hat opened

charges mybe used

f i r s t at the next

f i r i ng

of the

gun

e

I f

the gun

i s acti ve

proj ec t i l es

myremai n

fuzed

I f

i nacti ve

f uzes

shoul d be

removed and returned to ori gi nal boxes and

l i f t i ng

eye pl ugs shoul d be

repl aced

i n proj ect i l es

26 LUBRCATIONORDER

Secti on

I V

LUBRCATION

a

Reproducti onof War Department Lubri cati on

Order LO9-424

f i g

17)

prescri bes

f i r s t andsecond

echel on l ubr i cat i on

maintenance

b

The poi nt s

of

appl i cat i on

l ocat ed on

the

Lubri cati on Order

are i l l ust rated

i n f i gur es 18

and

19

They mybe

i dent i f i ed

by the

numbers around

the

border

of the

War Department Lubri cati on

Order

e

War

Department

Lubri cati onOrder

i s pl acedon or i s i ssued

wtheach i tem

o

mater i el

andi s t o

remai n

wth i t at

al l ti mes

I n

the

event themater i el i s recei ved

wthout

a

War

Department

Lubri cati on

Order a repl acement

w l l be requi si t i oned

i mmed atel y

i n conform

ance wth

i nstr ucti ons and l i s t s i n

M

1-6

27

GENERAL LUBRCATION

SERVCNG

INSTRUCTIONS

a

Lubri cants

arepr escri bed i n the

KEY

i n accordance

wth

three

temperaturesr anges

above 32

° F

from

+32 Ft o 0° F and be

24


29/140

TAN

9-424 Par

27

Gunand

Carri age

l ow

l ° F

The

ti me

t o change

t o

l ubri cant s pr escr i bed

f or

a

di f f erent

temperaturerange

i s

determned

by

mai ntai n ng

a

cl ose checkon

oper a

t i o n

of

themat eri el

duri ng t he approach

t o

prolongedperi ods

when

tem

peratures wi l l be

consi st ent l y

hi gher or

tower Because of

the

ti me

element

i nvol ved

i n

prepari ng

f or

operati on

at

l ower

prevai l i ng

tem

per at ures a

change

t o

l ubri cant s prescri bed

f or a l ower rangewi l l be

undertaken themoment operati on becomes

sl uggi sh

Ordi nar i l y i t

wi l l be

necessary

to

change

l ubri cant s only

when

expected atmos-

pheri c

temperatures are consi st ent l y i n

a h gher or

l ower range

b I nt erval s

speci f i ed on the

Lubri cati on Order are

mnimum

mai ntenance to be performed

by

the usi ng organi zat i on

I nt erval s

may be

reduced

under such

condi t i ons

as

excessi vel y

hi gh ambient

temperatures,

extreme

humd ty,

and

dustyat mospheres

duri ng per i ods

of

prolonged

f i r i ng or

operati on

ny

one

of

these

condi t i ons may

qui ckl y destroy

the

prot ecti ve

qual i t i es

of

the

l ubri cant s

and requi re

more

f requent

servi ci ng

i n

order

t o

prevent mal functi on ng

or dam

age to the

mat eri el Lubri cate mat eri el i mmedi atel y f o l l owi ng

ex

posure t o extrememoi sture

e

Lubri cati onEqui pment

1 Clean l ubr i cat i ng

equi pment

both before

and

af t er use

Operate l ubr i cat i ng

guns

caref ul l y

and

i n such

manner

as

t o

i nsure

a

proper di st r i but i on of

the

l ubr i cant

I f l ubr i cat i ng

f i t t i n g val ves

s t i ck

and prevent

the entrance of the

l ubri cant

remove the f i t t i ng

and

determne the cause Replace broken

or

damaged l ubri cat ors

I f

a

l ubr i cat or cannot be repl aced

i mmed ate y,

cover hol e wth tape

as

a temporary exped ent

t o

prevent

the

entrance

of

di rt

I f oi l l i nes

become

cl ogged

d sassemble

t he

l i ne

andremove

the

obst ruct i on

2 Lubri cati ng f i t t i n g s ,

grease cups oi l cups

oi l hol es

and

i l l

l evel

and

drai n

pl ugs unl ess

otherwse speci f i cal l y

aut hor i zed

are

ci rc l ed

i n

red f or ready

i dent i f i cat i on

3

Wpe

l ubr i cat ors

andsurround ng

sur f ace cl ean

bef or e

appl y

i ng

l ubr i cant Where rel i ef val ves

are

: pr ovi ded

appl y

new l ubri

cant unt i l theold l ubr i cant i s f orced

from

thevent

Excepti ons

are

speci f i ed i n notes

or on the

Lubri cati on

Order

Metal surfaces

on

wh cha

f i l m o f l ubr i cant

must be maintai ned

by manual

appl i cat i on

wi l l always be

wped cl ean

before

the

f i l m

i s

renewed

d

Cleani ng

1 Unless otherwse speci f i ed

use

r i f l e bore cl eaner

or

dr y cl ean

i ng

sol vent to cl ean or

wash al l

metal parts

of

thegun

and carri age

whenever par t i al or

to ta l

d sassembly i s undertaken or

when

renewng

the pro tect i ve l ubr i cant

f i l m

on exposed metal

surf aces

Use of

gasol i ne

f or t h i s

purpose i s

prohi bi ted yal l

par t s

thorough y

be

f or e l ubr i cat i ng Flushng

of

gear cases

or beari ng

housi ngs unl ess

the

i ncl osed mechani sm

s f i r s t

di sassembled i s not authori zed

25


30/140

Par

27

TM4-424

Gunand

Carri age

oz

a_

s

2

6

o o

v o a o o o

N

Fi gure

17

-

i

mn

e

m

c

Kz

X

°°

XX

o

z

lo

c

o co

z _Jz

c7V

c

Y

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mX

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r

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co

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r T

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E

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7

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31/140

TM

9-424

Lubri cat i on

Order

en

m

Gunand

Carr i age'

27

Par

.

27

to

E

J

U

0

r= °C

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32/140

Par

GunandCarri age

i gure 8 Lubri cati on oi nts

28

TM

9 424

RA

PD95 65


33/140

T 9 424

unand Carri age

Pi gure

Lubri cat i on

Poi nt s

29

Par 27

AA PD

95 66


34/140

Pa r s

27-29

TM

9-424

GunandCarri age

2

Care must

be takenwhen cl eani ng

oi l and

grease compart-

ment s t o i nsure t he compl ete

removal

of al l resi due

or sediment

D rt or other f orei gn matter

shoul d not be

al l owed

t o drop i nto any

of the

l ubri cant

reservoi rs

28

LU RC TED

Y

HGHERECHELON

a Cradl e trunn on

bear i ngs par

38a

h

Cradl e l i ner

par

37

a 4 }

e Pivot

yoke

thrust beari ngand

bush ng

par

38d

Secti on V

M LFUNCTIONS

ND

CORRECTONS

29

GUN ND

REECHMECH NSM

a Msf i re

1 I f i t i s uncertai n

whether

primer has f i red,

ej ect

the

primer

af ter

two attempts t o f i r e wth the magneto,

usi ng the butt er f l y net

t o catch theprimer

Examne

theprimer

a I f examnati on shows

that

the primer has not f i red, ei t her

the primer

was def ecti ve or the el ectri c f i r ing ci rcui t was

broken

Proceed

as i n step 2 , bel ow

b I f examnati onshows

that theprimer has

f i r e d ei t her a

hang

f i r e has occurred or the charge has fa i led

t o

i gni te

Proceed

as i n

step

3 , bel ow

2

PRMER

I s

NOT

HE RD

To

FIRE

Make

two

attempts

to

f i r e the primer Remove pri mer , i nsert

new pr i mer , and f i r e

a

I f newprimer f i r e s then

preced ng

primer was defecti ve

b I f newpri mer f a i l s

to f i r e

i t

i ndi cat es

that

themagneto f i r i ng

ci rcui t i s def ecti ve Check

the

f i r i ng

circuit,

t i ghteni ng

connecti ons

or contacts, and r epl aci ng

brokenwres I f

primer s t i l l

does

not f i r e

use f r i c t i on primer and

not i f y

ordnance

maintenance

personnel

3 PRMER

I s

HE RD

To

FIRE

As a

precauti on

agai nst the

dangerous

possi bi l i t y of

a

hangf i re,

keep

the

pi ece

pointed

at the

target or i n

a

cl ear

f i el d of f i r e f or amni mumof

64

seconds

before

removi ng

primer

C ean out pri mer

vent ,

i nsert

new

pri mer, and

attempt

to

f i r e

I f the primer

i s

agai n

heard

to

f i r e

wai t

at

l east

64

seconds,

then

remove

expended pri mer , open breech, wthdraw

unexpl oded charge,

and

examne

Fai l u re

of

the

propel l i ng

charge

i ndi cat es

anabnormal

condi ti on

a I f

the

i gni ter

end of

the

charge was agai nst the proj ecti l e,

i f the

i gni ter

chargewas fol ded over andnot

accessi bl e

t o

the primer

f l ame, or

i f

the

i gni ter

protector

cap

i s s t i l l i n pl ace,

make

the cor-

rect i on

and

rei nsert

30


35/140

TM9-424 gars 29-30

Gri nandCarri age

b the i gni ter i s mssing or wet or i no obvi ous reason f or

f ai l ur e

i s

seen

r epl ace

the charge

i n

the ori gi nal

cont ai ner

and

wrap-

pi ng

Mark

cont ai ner

f or fu ture examnati on

and

report andremove

t o saf e pl ace pend ng examnati on

check

pad seat

maintenance

personnel

c Breechbl ock Di f f i cul t

To

Open

After Fi ri ng

1

Gas check

pad stuck i n 1 Remove, wpe

cl ean

seat

and

appl y a f i l m of oi l Wpe

of f

excess

2

Broken

l oadi ng

tray

i n 2 Remove tray and re

t e r f e r i ng

wth

breechbl ock turn t o

ordnance

mai ntenance

personnel

f or r epai r

Load

by

hand

d Fai l ure of Breech

Mechani sm

ToOperate Freel y

1 Lack of l ubr i cat i on

Bur- 1

Dsassembl e

breech

red dented, or scored part s mechan sm cl ean and rel ubr i

cat e par

3S Report dam

aged breechbl ock threads

or

other damaged

parts t o

ord-

nance

maintenance personnel

e Ri f ti ng

of

GunBore

Rustedor Corroded

1

Bore

i mproperl y

cl eaned 1

Cean and o i l bore

as

and

oi l ed Powder foul i ng or out l i ned i n paragraph35

b

moi sture

cor rosi on

30 RECOL

MECH NSM

a

Gun

Recoi l s

Wth Shock

1 roken recuperator 1 Report

to

ordnance

spr i ngs

maintenance personnel

2 Voi d i n

recoi l cyl i nder

2

Ref i l l

cyl i nder

wth oi l

par 37

b GunReturns t o

BatteryWth

Shock

1 Voi d i n

recoi l cyl i nder

1

Ref i l l

cyl i nder

w t h

oi l

par

37

s z

h

Gas

Leakages

cause Correcti on

1

Brui ses on

gas

check

pad 1 Replace

or

torn

coveri ngs

2

Burred or

broken

spl i t

2

Replace

r i ngs

3 Dented

or

scored gas 3 Report to

ordnance


36/140

Pars

30- - 31

TM9-424

GunandCarri age

Cause

Corr ecti on

2 Recoi l cyl i nder pi ston

rod 2

Repor t to

ordnance

i mproperl y

ad usted

mai ntenance

personnel

3 Pi ston rod

st r i ki ng

cyl - 3

Repor t to

ordnance

i nder

head

i nst ead

of

gun

rest i ng

mai ntenance

per sonnel

on stop

c

Recoi l andCounterrecoi l Sl ow

1 Recoi l sl i des i n

cradl e

1 Rel ubri cate

i mproperl y

l ubr i cat ed

2

Recoi l

s l i de

sur f ace of 2

Cl eanand

coat

gunbar

gun bar r el not properl y l ubr i - r ef wth l ubr i cant

cated

3 Recoi l o i l col dand th i ck- 3 Recoi l speed w l l

be

ened sat i s f actory af ter f i r i ng one or

two

rounds

4 Presence of rust on r e- 4 Remove rust and co r ro

coi l s l i de

s i on

from

r ecoi l sl i de wth

cro-

cus

c l o t h

S St i cky

packi ngs

S

Report to ordnance

mai ntenance

personnel

31 ELEVATING

MECHANSM

a Ef fort

To

El evate

GunUneven

1

El evati ng rack on

cr adl e

1 Repor t

t

o ordnance

out of al i nement

mai ntenance

personnel

2

D r t

between

rack

and

el -

2

Cl ean

rack

and

gear

and

evati ng pi ni on gear

r el ubr i cat e

3 I ce or

forei gn

materi al

i n

3

Report

to ordnance

gear housi ngs

mai ntenance personnel f or

r e-

moval and

r el ubr i cat i on

of l

evati ng

mechani sm

4

Crad e trunn on bear i ngs 4

Lubri cate

bear i ngs sec

not properl y

l ubr i cat ed

I V

S

Trunni on

beari ngs rusted S

Report to

ordnance

or damaged

maintenance

personnel

h

Backl ash

i n Handwheel

1

Wear

of gear s

worm

and

1 Report

to

ordnance

wormwheel

mai ntenance

personnel

2

El evati ng rack

out of

2 Report to ordnance

al i nement

mai ntenance

personnel

3 El evati ng rack and

pi n-

3

Report

t o

ordnance

i on i mproperl y mated

mai ntenance

personnel

32


37/140

TM9-424 Pars 32-33

GunandCarri age

32 TR VERSING

ME H NSM

a Baekl ash i n Handwheel

ause

Carreoi an

1

War of

worm

and

worm

1

Report

to

ordnance

wheel mintenance personnel

2 War

of

tr aversi ng

rack

2

Report to

ordnance

and

pi ni on

gear

mintenance

personnel

b Handwheel Ef fo r t

Excessi vel y

H gh

1 Di r t

rust

or gummed

oi l

1 Removemnhol epl ates

on

pi vot

yoke and pedest al

rol l er

i n

pedest al

Cean

bear i ngs

and

thrust beari ng rel ubr i cate

2 D rt

on

tr aversi ng

worm

2

C ean

and rel ubri cate

wheel

3

Lubricating

oi l

i n

worm 3

Change

l ubr i cant

sec

and

wormwheel

case thickened

by I V

l owtemperature

4

Wrm

st i cki ng

i n

case 4 Report to ordnance

mintenance