Instalacion y mtto cadenas rexnord.pdf

8/11/2019 Instalacion y mtto cadenas rexnord.pdf

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rive hains

INST LL TION

OPER TION

O

M INTEN N E

X

ORIVE H INS

UIIII II



INSTALLATION, OPERATION, AND

MAINTENANCE OF REX DRIVE CHAINS

Table Of

Contents

Protect Your Investment

Types Of

Rex Drive

Chains

Materials

Components

Chain-Sprocket Interaction

Drive

Arrangements

Installation

Of Drive Chains

Chain Slack Catenary

Chain Take-

U

ps

Chain Elongation

Drive

Chain

Maintenance Procedures

Maintenance

Check

Chart

1

3

4

5

6

7

9

9

9

12



Protect

Your

Investment

a ins a re easier to install

and

are able to

more

abuse

than any other sys tems for

power from

one

shaft to

installation lubrication

and

intenance can increase

their

service tife

y several times and save

you

a lot of

in

the long runo

he fas te r

chains operate the

greater

the

that they

require

to

enable

you to

get

the

for your chain drive dollar.

e importance of correct

installation

and

maintenance of

chain

drives

be emphasized too stongly. You have

money in

the purchase

of

chain

r ive equipment. Natural ly you expect

a

from that equipment in

continuous

operation and in long

performance.

chains are

built

to absorb a lot

of

no

chain

will give

complete

unless it is properly installed

nd

operated given periodic inspection and

and proper ly lubrica ted . You

will get

extra

dividends

in

added service tife

through proper care

of

your chain

drives.

is the

purpose

of this handbook to help

you

get more carefree

mileage for your drive

chain dollar. The

degree of care required

depends to a large

extent

on the type of

ins ta llat ion and

the operat ing condi tions.

You wil l p rofi t

by

carefully observing the

lubrication

tips

and chart.

Tests

have

conclusiveIy

pro

ved the importance of

chain

lubrication

in

all services.

When a chain is properIy

Iubricated

wear

Iife is

increased

many foId

Even

under dusty

or

abrasive

conditions

Iubrication is

recommended.

OnIy when apptication conditions render

lubrication absoluteIy impossibIe shouId a

drive chain

be

operated dry

at

a

sacrifice in

wear life

The following pages of

this handbook

provide

vaIuable

data on protect ing your

chain investm ent through corree t

installation

operation

and maintenance

information which w ill point

out

how

you

can

get

maximum

performance

and tife

from

your

drive chains.



Types

Of

Rex

Drive Chains

Rex roUer chains are for smooth efficient high

speed drives of 5000 f.p.m.

and overo

They also

may

be

used

at

slow

or

medium

speeds. They are

available

in

single

and

multiple widths.

Rex double-pitch roUer chains are

made

with the

same size roUers bushings

and

pins as

standard

roUer chains

but with

link plates twice the pitch.

They

are

for slow to

high

speed drives up to 3900

f.p.m.

Rex fabricated steel chains are the best choice for

high

torque drives

at

slow to

medium

speeds.

Rex detachable chains

are

for slow speeds

up

to 350

f.p.m.

and

very lightly loaded drives. Available

in

maUeable iron

and

steel.

Rex Pintle chains are for slow speeds up to 5

f.p.m.

and

lightly loaded drives.

Rex

H type

chains are for slow speeds up to 500

f.p.m.

and medium

loaded drives.

Rex welded steel chains are

an

economical choice for

sorne light

duty

cycle drives

at

slow to

medium

speeds.

is

important

that

power dr ive

chains are operated

in the proper

direction to

assure maximum

wear

life of both

chain

and sprockets

5traight sidebar roUer chain

can

travel in either

direction.

3

AU

other

types of

drive

chains should travel

barre

or

closed

end

toward

the smaUer

sprocket.



Materials Components

And

Processes

Improve Performance

Lengthen

Lile

USHING

STR IGHT SIDE R

~ L L R

SIDE R

Drive

Chain

Design

Rex drive chains consist of pins, bushings. sirlebars,

and

rallers. Píos

and

bushings provide bearing surfaces for the

chain to articula te over sprockets.

The

pin-bushing bearing

area is referred to

as

the cha in joint . Sirlebars conneet

these bearing surfaces into chain.

A

majar

consideration in the selection of 5teel used in chain

manufacturing is hardenability ar how a material will

respond to given processes. These considerations are

extremely

important

when designing a chain to meet

certain

strength

and

wear

resistance requirements.

ideb rs

are tensile members of a

chain

and establish chain

pitch, which i s the distance between chain joints.

Sidebars

can be offset or straight construction.

íns

connect chain links.

They

are locked into

sidebars

by

an interference fit so a relative rotation occurs between the

pin

and

bushing.

ushíng

inside diameter pro

vides

the bearing surface

live

bearing

area} for pin rotation.

The

bushing outer diame ter

provides the bearing surface for chain follers.

oll n

serve thefunction ofproviding smooth roHing action

during engagement with sprocket t eeth. RoHers a re a lso

designed to

accept

the h igh impact loads

imposed during

drive operation thus reducing chain fatigue

and

extending

chain wear I e

Treating Pracesses

ord employs several heat treating processes to improve

eria l characteristics. The hea t treating process used is

the particular requirements of drive

T.H.)

u-hardening, the material is hardened through its entire

s-section. Thru-hardening

is

specified

to

increase strength,

e fatigue resistance

and

reliability.

CARB.)

burizing is a process where components are subjected to a

temperature carbon-rich atmosphere and quenched and

pered to

produce

very high surface hardness while

aining a tough, ductile coreo Carburizing is specified to

maximum surface hardness to prolangwear life.

INDUCTION

C.I.H.)

Circumferential Induction

Hardening

chain píos

duces a deep hard case to a controlIed depth around the

e circumference. Case depths are typically twice that

oí

a

pino The benefits of circurnferentially induction

ening are increased

pin

fatigue resistance

in

corrosive

and a significant improvement

in

wear life.

SELECTIVE

INDUCTION

HARDENING S.I.H.)

Rex Selective Induction Hardening produces a deep hard case

like Circurnferential Induction Hardening except that the

hardness, rather than being circurnferential, is on the

Uve

bearing area of lhe

pin

onIy. The back s ide of lhe

pin is

left

lough and ductile so lhal lhe pln ls capable of laking

maximum shock and overload without failure. Selective

Induction Hardening maximizes wear life while maintaining

optimum toughness.



Chain

- Sprocket Interaction

D WORKING STRAND

0

0

0

: . . . . . . .

o o o o

DN

o

C - SLACK STRAND

The

greatest

amount

of flexlng occurs at points A, B

and D aboye.

During each

complete cycle in a

chain

drive

system,

every link

of

the chain undergoes

cyclic

loading.

In

the

working strand,

the

chain

is under full tension. In

the

slack

strand, [catenary)

there

is

minimum tension

or load.

The chain tension

is

absorbed by the sprocket teeth.

The ability

of

the sprockets to absorb this tension

is

dependent

upon

the pressure angle of

the

teeth, the

number

of

teeth encountered with

the

chain, and

the

tension in

the

slack strand catenary).

As the chain

circles

around the Driver sprocket

(from

Ato

B .

the first tooth

in

contact [at

A)

absorbs

a

given

percent o f the cha in

tension.

The nex t

tooth

absorbs

the same percen t

of the

tension

not

absorbed by the

fírst

tooth.

This

repeats at

each

tooth in contact,

with

Sprocket

Tooth

Form

To function properly, d rive chains mus

be run

over

sprockets tha have teeth proper ly des igned for the

environment in which they operate.

Worn

or

improperly designed sprockets

are

one of the

causes for

premature

chain wear

or

failure. Chain

jumping,

wedging, or

backlash

may

result

he

proper

tooth

design

is

not

utilized.

Closely insped the chain and sprocket interaction to

insure a smoo h and noiseless operation. The chain

should

easily enter

and

exi the sprocke wi hout a

hitch. 5

For a

chain

to provide long dependable life,

the chain

must be

properly

designed

and

manufactured and used

with

sprockets

manufactured

to

ANSI dimensions

to

resist

wear and fatigue.

each

tooth

absorbing

a

percent ofthe chain tension not

absorbed by the

teeth

preceding

it.

Finally,

at

B

there

is only a

small

amount

of

chain

tension not absorbed.

This

unabsorbed tension must

be

balanced

by

the tension

in the

slack

strand

if the

drive is to function properly. Normally,

this

balance

point occurs before the cha in moves into

the s lack

strand

catenary).

From B

to

e

there

is

relatively

little

load

on

the chain.

The load

increases

from e to D

until

(at D) the

chain

is

once g in subject to m ximum tension

This

cyclic loading - from load to no-load,

back

to

load

-

emphasizes the importance of the

proper

design

and

manufacture

of

both the chain

and the

sprockets.

Long service life can only be obtained when

the

drive is equipped with quali ty chain and quali ty

sprockets.



c:r j;J

lE S RECOMMENDED

FIl

G

BEST

RII NGEMENTS

OTHEI CCEPT BlE RR NGEMENTS

least 120° wrap on Ihe driver sprocket is desirable to

r

proper interaclion between chain and sprocket.

small sprocke ls a re

used

horizonlal drives,

it is

to

have

the slack

strand

on the bottom Fig. 7 rather

n on the top Fig. 10. Otherwise with an apprec iable

unt of slack, Ihe

strands

may strike each other.

the drive s ligh tly inclined Fig. 5 less

care

wil be

because the weight

ofthe

slack

chain strand helps

to

beller

contact between

the

chain and sprockets.

I

chain strand

can be moved a smal

amount

by

hand,

it is

too l ight .

Obviously, heavy chains require

considerable

, e jus t to

overcome

chain

weight

when

checking for

slack

ustm nt

ains

should never

be run

with

both strands light.

Tight

ands wil not only cause the

chain

to

wear

rapidly,

but

ded load will be

put

on the shaEts

and bearings of

mected equipment.

Drive

Arrangements

ere center

distances

are short Of

drives

nearly horizontal

slack

should

be in the

bottom strand, especial y where

e-up adjustment

is Iimited Fig.

6 rather than

Fig.

9 An

of

s lack in the top

strand

may

al ow the

chain

to

pinched between the

sprockets,

Fig. 9.

position

of

sprockets

in

drives should

recelve careful

Satlsfactory

operation

can

be

secured with

the

of the drive

a t any

angle to the

horizontal,

proper

nsideration is given Certain arrangements require

less

and

care than

others and are therefore less ap t to

trouble. Various

arrangements are il ustrated

in the

The direclion of

rotation of

the

drive sprocket

is

en the large

sprocket

is

directly above

the

smal

sprocket,

8 a drive

cannot opera

te with much chain slack. As the

wears,

shaEt-center distance

must

be

adjusted or

an

be placed

against

the

outside

ofthe

slack

strand (nearthe

sprocket) to

adjust

slack

and

keep the

chain

in

proper

ntact with the smal sprocket.



Installation

Drive

Chains

Befare beginning any

maintenance

on chain

driven

equipment

be certain the power cabinet is

locked

out.

1. Use

as

little

clearance as

pract ical between lhe

bore of the

sprocket and

the shaf .

Do

nol

drive

the spracket onlo lhe shaft ; fit it.

2. Make sure that

the keys

fit snugly in lhe

keyways

in lhe shafts and sprockets ar laper-

lock

hubo

If there is a gap misalignment exisls.

RI T

WRON

orree alignmen

In aligning lhe sprockets. secure

one

of lhe

sprockets to lhe

shafl and

hold a

slraight

edge

againsl it. A taul wire

or

s lr ing can be used

i

a sufficiently long slraight edge is

nol available

Then slide lhe olher

sprocket

againsl the

slraight

edge and secure i t lo lhe shaf .

Ineorree alignmen

3. Locale

lhe

sprackets as clase

la lhe support

bearings as praclical with the hub away from the

bearing.

5.

5.

Rolale

lhe

sprocket

opposile

lo

the

one

againsl

which lhe straight edge is held.

the

gap

remains conslanl then

lhe shafts are not parallel

and

musl be aligned.

the

gap

chonges

however lhen the bore in

lhe

sprocket is nol

perpendicular lo its face.

lhe re sulting

misalignmenl is judged

to

be

severe

then a new

sprockel is

required.

xtr

re is

misalignment

simultaneousIy.

required

problems

here

can

because both

be present

7





Chain Slack

Catenary

~ - = = C =

~

@

3 Celllcr Oislance

ORRE T SL K

xcessíve Slack

The correct amount of slack is essential to the

proper

operatio

of chain. Unlike beIts chain requires no initial tension an

should

not

be tightened around the sprockets. Proper

adjusted chain drives

should permit

slight flexure

by hand

the slack

strand

of abut 2 -

of

the center distance.

Too much slack is also harrnfuI. On long centers particularI

too much slackwilI cause vibration

and

chain flexure material

reducing the life of the chain. On

long

centers

it

recornmended that the slack strand be supported or taken up b

idler sprockets

or

strip guides of hardwood or brass. The strip

simply a continuous support for the cha in which prevents

from sagging too mucho

When

chain is too tight the

working

parts carry a

much

heavi

load than is necessary and

work

much

harder

witho

delivering any

more

power than properIy installed chain. Th

causes rapid chain

wear

because of increased pressures

in

t

joints.

In

addition this condition overIoads

and

accelerat

wear in the shaft bearings.

Recommended Locations Of

hain

Take Ups

On drives

where it

is

not

practical to

have

adjustable centers

or where

longer center

distances might cause the slack side of thé

cha in to strike an obstruction

or

whip the

instaIlation of a chain take-up is recommended.

The sketches shown here ilIustrate proper

locations for most efficient operation.

Verlical d ive.

hain longation

Wear

on

fue

pin

outside

diameter

and

bushing

inside diameter causes chain elongation.

Once the chain

has

elongated or worn past acceptable limits jumping of sprocket teeth

and/or improper chain-sprocket interaction

can be

expected. Typical aIlowable

elongations are 3 -

5

of chain pitch for drive chains used with sprockets having up to 60

teeth. After the chain has elongated or worn

past

acceptable limits it should be replaced.

9



Drive

Chain

Main tenance Procedures

Type

Lubricant

ication is essential for maximum chain

ket life. Drive chains can and should be

ication effectiveness will vary with the

nt of lubricant used and frequency of

cation. Ideally a lubricant film should

be maintained between working parts.

e manual lubrication is the approach of

lubrication should be applied once a week

the chain is not

under

load.

t

is important

t the lubrication between the pin and the

and

between the roller and the bushing.

n is under the least load after

i t

leaves the

sprocket. This area will contain a catenary

and

this is the area to which manual

ation should be applied

Greases will

not

penetra te the bearing areas

and

are not recommended for lubricating.

üil

should be used. The viscosity must be high

enough to allow the lubricant to work into the

chain.

SAE 3 is considered a good general chain

lubricant.

Temp. Deg.

F

Lubrican

20 -

40

S A E 20

40

- 100

S A E 30

100

-

120

S A E 40

120

-

140

S A E 50

Chain Cleaning

M NU L

OIL

TH

LUBRIC TION

Perodic

cleaning

of

cha in and sprocke ts

to

remove caked lubri cants and t rapped

dirt

and g ri t w ill add

substantially to

sprocket

and

chain IHe.

The

method

of

cleaning

will depend on the

application environment

Several suggested

methods

are:

operating

at

relatively high

speeds

be completely enclosed in an oi case

strand of the

chain should

just dip

the oi when

the

chain is running

the

proper

oi leve . Excess oi

churning

and

heat

best

results dean chain and sprockets

10

Removal and

washing

of

chain

and

sprockets in a suitable

cleaning

solution

Brush chain

and sprockets manually

or

with automatic equipment

to remove

debris

Steam

cleaning



h fls nol p r l le l

h fts p r llel

3

Sprockets must be

mounted

squarely a

securely

on their

shafts.

After c1eaning

allow

adequate time for chain

to

dry.

Cleaning frequency

will

depend

on

service conditions.

After

c1eaning

always relubricate

chain

and

sprockets thoroughly.

When c1eaning always check chain and

sprockets

for signs of wear and corrosion.

4.

Never run

new

chain

over sprockets w

worn or hooked teeth. This practi

reduces

chain

life very

rapidly

increasing internal chain

loads. Excessi

wear

and even breakage

results.

CAUTION

A

chain

guard

or other protect ion

should be installed where dust dirt

abrasives corrosion or elevated

temperatures

are present.

5

Never

run badly worn chain

on

ne

sprockets.

In this case the sprocket pit

is shorter

than

the

chain

pitch

a

correspondingly

just as worn sprock

hurt good chains worn chain will cau

premature

wear

and reduce

wear

tife

new sprockets.

Danger Of Worn Sprockets

Chains cannot be efficient or durable if used

with

worn

or

faulty sprockets.

is therefore

important to inspect sprockets regularly for

wear and alignment.

1.

Chains and sprockets must mate with each

having exactly the same pitch.

Be

sure shafts are set parallel and level in

rigidly supported bearings.

6. Gn single direction

drives

only one

side

the

tooth

wears. not too badly worn t

_ sprockets can be

reversed

to put t

unworn

tooth

face to

work.

This

practica since sprocket

teeth a

symmetrically designed. However

recommend caution in reversing

sprock

on

high-speed

drives. Do not reverse wh

the

back

sides of teeth show any signs

wear.

7. is recommended that the driver sprock

have

hardened teeth for maximum we

tife.

11



A. Excessive Noise

Maintenance Check Chart

For Rex

Drive Chains

H.

Brokeo Sprocket Teeth

le Causes

oí

sprockets

o I i t le or too much s lack

lubrication

ose

casings or beariogs

or sprocket worn

oul

l arge a

ehaio pitch

slze

To

Do

alignment and

correel

cen te ra for

proper

slack.

or idl er

ricate properly

.. check

lubricating

l o be sure oi S reaching all

parls

up

all bolts, and brace

casings

If

place

cha io a nd/ or sprocket

[sorne

can

be

reversed

- see page 11.

eck chaio drive recommendaHon ¿harl

Wear Chaio Side

Bars

Or Liok Plates

Aod

Sides Of Sprocket Teeth

CaUfles

To Do

move

ehaio and

corree

alignment oí

and shaíts

Chaio Climbs Sprockets

Causes

fil(ing

of

chains

on

sprockets

a in worn out

chain wrap

chain

slack

build·up

in

sprocket

tooth pockets

To Do

sure sprocket

bottom

diamelers

are

oversize

place

chain and sprockets

(sorne

ca n be

reversed

- see page 11J

vise

driver arrangemenl

l o ge l more

teeth

in

cantael with

chain, or use

take-up

lo

¡ncrease

wrap

centers

or

take-up

for

proper slack

move mater ia l bui ldkup o protect

drive

cantael with

foreign

material,

Of use

ockets with

mud

relief.

pitch

line

.

Brokeo Pios, Bushiogs,

Or Rollers

ble Causes

speed

too high for

pitch and sprocket

shock

or suddenly

applied loads

ial build-up

in

sprocket

tooth

pockets

ate lubrication

or sprocket corrosion

orI y f it ti ng

sprockets

What

To

Do

1. Use shorter pitch

chain

of

equivalent or

grea ter s trength and/or

check

number

of

sprockel

teeth lo be

sure it

is

within

recommended limits

for

speed

involved.

Select a

sprockel wilh increased number

of

teeth, i f necessary

2.

Reduce

s ho ck loa ds e asy

starts

assure

longer

Iife)

3. Remove material

build-up

(see C·5)

4. Lubricate

properly

5. Protect from corrosion

6. Check

sprackets

for

wear and correct

bottom diameter

E Chaio

Cliogs

To

Sprockets

Possible Causes

1. Incorrect

application or badly

worn

sprockets

2.

Heavy

or tacky lubr icants

3.

Material

build-up

on

driver

sprocket

tooth

pockets

What

To

Do

1.

Replace

chain and sprockels

(sorne

sprockets

can

be

reversed

-

see

page

11)

2. Clean

and lubricate properly

3. Remove material

build.up

{see C 51

F.

Chaio Whip

Possible

Causes

1. Excessive chain slack

2.

High

pulsaling laads

3.

One

or

more

stiff chain joints

What To

Do

1.

¡nstall

chain

take-up or

idler,

or adjus t

centers

2. Reduce load

wherepossibleor

replace

chain

with

one o f

suitable strength

3.

Remove

stiff

I inks, or

dríve

back

on

pins

to

provide

proper

c1earance

between

side

pi

ates

(also

see G- l

lo

G·6J

G. Chaio Gets Stiff

Possible Causes

1.

Misalignmenl

2.

Inadequale lubrication

-

causes wear

3.

Corros ion

4.

Excessive

overloads

5.

Material build-up

in

chain

¡oinl

6. Peening of side

plate

edges

What

To

Do

1.

Check

sprocket a nd

s ha ft a li gnment

(see

C-l

2. Remove

chain

ir d ir ty o r corroded

... clean

and

lubricale

properly

3. Protect

chain

from

corros

ion

4. Reduce

excessive overloads

5.

Protect chain

with

case

... c le an

and

lubricate more aften

6. Check for

chain interference

and

correct

12

Possible Causes

1.

Obslruclions. or

foreign

malerial

in

chaio

cases

2.

Excessive shock

loads,

especially with

small, cast iron sprockels

3.

Chain cl imbing sprockel teeth

What

To

Do

1.

Check

c hai n a nd sprockel clearances

...

remove

foreign

material

2. Reduce excessive shock loads , or use steel

sprockels

3. (See C-l lo C 5}

Collers

Come

Out

Possible Causes

1. Vibration

2.

Obstruction striking cotters

3. Cotters

not

installed properly

( should be

properly

spread and drawn back

snugly

against side platel

What To

Do

1. Reduce

vibration

2.

Eliminale

obstruction,

o r t ap

in

ends

back

until

colter

fits

snugly

againsl side plates,

or

use

riveted chain

3.

Correcl faully inslallation

J Chaio

Drive

Ruos Too Hot

Possible Causes

1.

Operaling

in

excess of

recommended

maximum speed

2. Insufficient

amount

of

lubricalion

3. Chain operaling

loo

fasl for bath

lubricalion

4. Chain immersed

loo

deeply

in oil in

balh

lubricated drive

5.

Chain or shafts

rubbing againsl an

obstruction or

seal drag

What To

Do

1.

Check drive

for recommended

maximum

speed

for type

of lubricalion

used

2.

¡ncrease volume

of oil

and/or

cool oil in

reservoir

3.

Use

oil

slream

syslem of lubrication

4.

Adjust

oillevel to

proper

heíght

5. Remove

obst ruct ion againsl which

chain

rubs



WorUd CUass ustomellSell vice

For over 100 years the dedicated people

Rexnord have delivered

excellence quality and service to our customers around the globe

Rexnord is a trusted name when it comes to providing skill lully

engineered products that improve productivity and efficiency lor

industrial applications woridwide We are committed to exceeding

customer expectations

every area

our business: product design

application engineering operations and customer service

Because

our customer locus we are able to more thoroughly

understand the needs your business and have the resources

available to work ciosely with you to reduce maintenance costs

eliminate redundant inventories and prevent equipment down time

Rexnord represents the most comprehensive portfolio power

transmission and conveying components the world with the brands

you know and trust

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Power of

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PRODueTS

INDUSTRIAL

CHAIIl

COUPLJNOS

EnOSPACE

SPECIAL

COMPOHEIlTS

{

WORL DWID E U STOMER SERVI E

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e: 61.2.4677.3811

61.2.4677.3812

Corrantes

ltda.

Leopoldo RS

ne: 55.51.579.8022

55.51.579.8029

CANADA

Rexnord Canada

Ud.

Scarborough Ontario

Phone:

1.416.297.6868

Fax:

1.416.297.6873

CHINA

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Shanghai China

Phone: 86.21.62701942

Fax: 86.21.62701943

EUROPE

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Vilvoorde Belgium

Phone: 32.2.255.8311

Fax: 32.2.720.1023

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Ketle GmbH

Betzdorf

Germany

Phone:

49.2741.2840

Fax:

49.2741.284362

LATIN

AMERICA

Rexnord lnternational

Ine

Milwaukee Wiseonsin

Phone:

1.414.643.3000

Fax:

1.414.643.3222

MEXICO

Rexnord

SA

de C V

Oueretaro Oro

Phone:

52.442.218.5000

Fax:

52.442.218.1090

SINGAPORE

Rexnord

International

Ine

Singapore

City

Singapore

Phone:

65.6338.5622

Fax:

65.6338.5422

UNITED STATES

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Smyrna Georgia

Phone:

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Fax:

1.770.431.7299

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Grave City Ohio

Phone:

1.614.675.1800

Fax:

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Phone:

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Fax:

1.817.385.2873

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Fresno California

Phone:

1.559.435.1111

Fax; 1.559.439.6887

Rexnord Industrial

Chain

Conveyor

48 West Mitche Street

Mi/waukee

Wisconsin 53214

Phone: 1 414 643 259

Fax:

1 414 643 26

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on-/ine

www.rexnord.com

Documents

Instalacion y mtto cadenas rexnord.pdf