ffjf • // ,'TM11-6115-472-13&P

TECHNICAL MANUAL

OPERATOR'S ORGANIZATIONAL, AND DIRECTSUPPORT MAINTENANCE MANUAL

(INCLUDING REPAIR PARTS ANDSPECIAL TOOLS LIST)

POWER TRANSFER BOX J-3748/G(NSN 6115-01-108-9094)

HEADQUARTERS, DEPARTMENT OF THE ARMY10 SEPTEMBER 1985UNIVERSITYOFVIRGINIALIBRARY

TM 11-6115-472-13&P

SAFETY STEPS TO FOLLOW IF SOMEONEIS THE VICTIM OF ELECTRICAL SHOCK

DO NOT TRY TO PULL OR GRAB THE INDIVIDUAL

IF POSSIBLE , TURN OFF THE ELECTRICAL POWER

IF YOU CANNOT TURN OFF THE ELECTRICALPOWER, PULL, PUSH, OR LIFT THE PERSON TOSAFETY USING A WOODEN POLE OR A ROPE ORSOME OTHER INSULATING MATERIAL

SEND FOR HELP AS SOON AS POSSIBLE

AFTER THE INJURED PERSON IS FREE OFCONTACT WITH THE SOURCE OF ELECTRICALSHOCK, MOVE THE PERSON A SHORT DISTANCEAWAY AND IMMEDIATELY START ARTIFICIALRESUSCITATION

WARNINGHIGH VOLTAGE

is used in the operation of this equipment

DEATH ON CONTACTmay result if personnel fail to observe safety precautions

Never work on electronic equipment unless there is another person nearby whois familiar with the operation and hazards of the equipment and who is competent in administering first aid. When the technician is aided by operators, hemust warn them about dangerous areas. Learn the areas containing high voltage in each piece of equipment. Be careful not to contact high-voltage connections when installing or operating this equipment.

DANGER 208V, turn off switches when input cable and generator are notconnected. Remove input cables before accessing the interior.

CAUTIONDo not close switches unless all maintenance and operating personnel are clearof the related generator set and operating equipment.

B

TM 11-411 5-472-1 3&P

Technical Manual

No. 11-6115-472-13&P

HEADQUARTERSDEPARTMENT OF THE ARMYWashington, DC, 10 September 1985

OPERATOR'S ORGANIZATIONAL, AND DIRECT SUPPORTMAINTENANCE MANUAL

(INCLUDING REPAIR PARTS ANDSPECIAL TOOLS LIST)

POWER TRANSFER BOX J-3748/G(NSN 6115-01-108-9049)

REPORTING ERRORS AND RECOMMENDING IMPROVEMENTSYou can help improve this manual. If you find any mistakes or if you know of away to improve the procedure, please let us know. Mail your letter, DA Form2028 (Recommended Changes to Publications and Blank Forms), or DA Form2028-2 located in the back of this manual direct to: Commander, US ArmyCommunications-Electronics Command and Fort Monmouth, ATTN: AM-SEL-ME-MP, Fort Monmouth, New Jersey 07703-5007.In either case, a reply will be furnished direct to you.

TABLE OF CONTENTSParagraph Page

CHAPTER 1. INTRODUCTIONSection I. GENERAL INFORMATION

Scope 1-1 1-1Consolidated Index of Army Publications and Blank Forms 1-2 1-1Maintenance Forms, Records and Reports 1-3 1-1Reporting Equipment Improvement Recommendations (EIR's) 1-4 1-1

II. EQUIPMENT DESCRIPTION AND DATAEquipment Characteristics, Capabilities and Data. 1-5 1-1Location and Description of Major Components 1-6 1-1

CHAPTER 2. INSTALLATION AND OPERATING INSTRUCTIONSSection I. INSTALLATION INSTRUCTIONS

Grounding J-Box. 2-1 2-1Installing J-Box 2-2 2-1Connecting Generator Cables 2-3 2-1

II. DESCRIPTION AND USE OF OPERATOR'S CONTROLS AND INDICATORSControls and Indicators 2-4 2-3

TM 11-61 15-472-13&P

TABLE OF CONTE NTS-ContinuedParagraph Page

III. PREVENTIVE MAINTENANCE CHECKS AND SERVICESGeneral 2-5 2-3PMCS Procedures 2-6 2-3

IV. OPERATING INSTRUCTIONSOperating Under Normal Conditions 2-7 2-4Transferring to Second Generator 2-8 2-4Parallel Operation of Generators 2-9 2-4Operating Under Unusual Conditions 2-10 2-4

V. PREPARATION FOR MOVEMENT 2-11 2-4

CHAPTER 3. MAINTENANCESection I. TROUBLESHOOTING PROCEDURES

General 3-1 3-1II. MAINTENANCE PROCEDURESReplacing SWITCH 3-2 3-1Replacing Connector 3-3 3-1

APPENDIX A. REFERENCES A -1

B. MAINTENANCE ALLOCATIONSection I. INTRODUCTION B-l B-l

II. MAINTENANCE ALLOCATION CHART FOR POWER TRANSFERBOXJ-3748/G B-3

III. TOOL AND TEST EQUIPMENT REQUIREMENTS FOR POWER TRANSFER BOXJ-3748/G B-4

IV. REMARKS B-5

APPENDIX C. REPAIR PARTS AND SPECIAL TOOLS LISTSection I. INTRODUCTION C-l C-l

II. REPAIR PARTS LIST C-l-1III. SPECIAL TOOLS LIST (Not applicable)

Group 00 Power Transfer Box. C-l-1Section IV. NATIONAL STOCK NUMBER AND PART NUMBER INDEX C-l-1 f

ii

TM11-6115-472-13&P

© 09 © g)

Figure 1-1. Power Transfer Box J-3748/G.

EL9ADOOI

1-0

TM11-6115-472-13AP

CHAPTER 1INTRODUCTION

Section I. GENERAL INFORMATION1-1. ScopeThis manual describes Power Transfer Box J-3748/G(fig. 1-1) hereinafter call J-box. It includes instructions for operation and maintenance, and containsthe repair parts and special tools list (appx B).1-2. Consolidated Index of Army Publicationsand Blank Forms

Refer to the latest issue of DA Pam 310-1 to determine whether there are new editions, changes or additional publications pertaining to the equipment.

1-3. Maintenance Forms, Records, and Reportsa. Reports of Maintenance and UnsatisfactoryEquipment Department of the Army forms and procedures used for equipment maintenance will bethose prescribed by DA Pam 738-750 as contained inMaintenance Management Update.6. Report of Packaging and Handling Deficiencies. Fill out and forward SF 364 (Report of Discrep

ancy (ROD)) as prescribed in AR 735-11-2/DLAR4140.55/NAVMATINST 4355.73A/AFR 400-54/MCO 4430.3F.c. Discrepancy in Shipment Report (DISREP) (SF361). Fill out and forward Discrepancy in ShipmentReport (DISREP) (SF 361) as prescribed in AR55-38/NAVSUPINST 4610.33C/AFR 75-18/MCOP4610.19D/DLAR 4500.15.

1-4. Reporting Equipment ImprovementRecommendations (EIRs)

If your J-box needs improvement, let us know. Sendus an E IR. You, the user, are the only one who can tellus what you don't like about your equipment. Let usknow why you don't like the design. Put it on an SF368 (Quality Deficiency Report). Mail it to Commander, US Army Communications- ElectronicsCommand and Fort Monmouth, ATTN: AM-SEL-ME-MP, Fort Monmouth, New Jersey07703-5007. We'll send you a reply.

Section II. EQUIPMENT DESCRIPTION AND DATA1-5. Equipment Characteristics, Capabilitiesand Data

Use of the J-box will facilitate transferring powerfrom one generator to another without extended interruption of power being supplied to the load. TheJ-box is a simple Y connector, allowing two 60 kwpower units to be simultaneously connected to oneload. When one generator needs to be shut down forservicing, it becomes a simple matter to transfer theload from the first generator to the second with onlyminor loss of power time to the load.DimensionsHeight: 18"Depth: 21"Width: 10"Weight: 65 IbsElectrical CharacteristicsTransfers 220 V, 3-phase, 60 Hz, 50A/phase

1-6. Location and Description of MajorComponents

On the front of the J-box (fig. 1-2) there are twoinput connectors. When not in use, the protectivecovers should be in place. Two switches, protected bya rubber rain flap and a metal cover, are on the leftside of the J-box (fig. 1-3). The output connector andterminal load bar (fig. 1-4) are found on the back ofthe J-box. The internal wiring (fig. 1-5) can bereached by removing the panel located on the rightside of the box. A schematic drawing (fig. 1-6) of thewiring is on the inside of this panel. Three groundstrap assemblies, two 6 ft and one 20 ft, are suppliedwith the J-box to be used for grounding.

1-1

TM11 -611 5-472-1 3&P

PILOT LIGHTGEN. NO.INPUT

GROUNDTERMINAL

POWER CABLEGEN NO.I INPUT

t

PILOT LIGHTGEN NO. 2INPUT

POWER CABLEGEN.N0.2INPUT

EL9AD002

I

Figure 1-2. Power Input Terminals.

1-2

TM11 -611 5-472-1 3&P

SWITCH GENNO. I

Figure 1-3. Switches.

PILOT LIGHTOUTPUT

SWITCH GENNO-2

EL9AD003

1-3

TM 11 -611 5-472-1 3&P

PILOTLIGHTOUTPUT

OUTPUTTERMINAL

I

EL9AD004

Figure 1-4. Power Output/Terminal Load Bar.

I1-4

TM 11 -611 5-472-1 3&P

EL9AD005

Figure 1-5. View of Internal Wiring.

TM11-6115-472-13&P

t

EL9AD006

Figure 1-6. Wiring Schematic

1-4

TM11-6115-472-13&P

CHAPTER 2INSTALLATION AND OPERATING INSTRUCTIONS

Section). INSTALLATION INSTRUCTIONS2-1. Grounding J-box(fig. 2-1)

NOTEAlthough each input cable includes aground lead, separate ground straps arerequired in the event one or both cables aredisconnected.

a. Position grounding rod within 3 feet of theJ-box.b. Connect to ground terminal stud of the J-box,one end each of the two 6- foot and the 20- footgrounding cables provided with the J-box.c. Connect loose end of one 6-foot cable to theground rod.d. Connect loose end of second 6-foot cable toground lug on power unit closest to J-box.e. Connect loose end of 20-foot cable to ground lugon power unit farthest from J-box./ See FM 20-31 for additional details on propergrounding procedures.

2-2. Installing J-Boxa. Ground according to instructions in paragraph2-1 above.

NOTEGenerators must be off.

b. Connect first generator to POWER CABLEGEN NO. 1 INPUT connector (Jl).c. Connect second generator to POWER CABLEGEN NO. 2 INPUT connector (J2).d Connect load to output connector (J3),

2-3. Connecting Generator CablesThe generator cables might be installed for use with adifferent J-box, or may come unassembled. In eitherevent, the following procedure should be followed toassure proper assembly to use with Power TransferBox J-3748/G:a. Turn off generator circuit breaker so power isremoved from the generator power output/terminalload bar.

TM1 1-611 5-472-1 3&P

GENERATOR 2

iy-J >-

GROUND ROD

GENERATOR I

•—•—•-, L_J'

(TO LOAD)

— 20' CABLE

6 ' CABLE

• 6 ' CABLE

EL9AD007

I

Figure 2-1. Grounding Diagram.

2-2

TM 11-6115-472-13&P

6. Insure the open lead ends of the cable are connected to the generator load bar as follows:Connector on If Cable is Pin DesignationPU Load Panel Color Coded isLI -Phase 1 Black AL2-Phase 2 Red B

Connector onPU Load PanelL3-Phase 3LO (Neutral)

If Cable isColor CodedBlueWhite

Power Unit Ground Green

Pin DesignationiscN

Section II. DESCRIPTION AND USE OF OPERATOR'S CONTROLSAND INDICATORS

2-4. Controls and IndicatorsNomenclature

POWER CABLE GENNO. 1 INPUT connector(JDPOWER CABLE GENNO. 2 INPUT connector(J2)Power output connector(J3)Terminal load bar

SWITCH GEN NO. 1 (circuit breaker) (SI)

FunctionGenerator 1 hookup

Generator 2 hookup

Load hookup, with connectorLoad hookup, withoutconnectorDistributes power fromgenerator 1 throughJ -box to load

NomenclatureSWITCH GEN NO. 2 (circuit breaker) (S2)

PILOT LIGHT GEN NO.1 INPUT indicator(DS1)PILOT LIGHT GEN NO.2 INPUT indicator(DS2)PILOT LIGHT OUTPUTindicator (DS3)

PILOT LIGHT OUTPUTindicator (DS4)

FunctionDistributes power fromgenerator 2 throughJ-box to loadIndicates generator 1 isin operation

Indicates generator 2 isin operation

Indicates power beingsupplied to outputconnector/ terminalload barIndicates power beingfurnished to load

Section III. PREVENTIVE MAINTENANCE CHECKS AND SERVICES2-5. GeneralBefore you operate. Always keep in mind the CAUTIONS and WARNINGS. Perform your before (B)PMCS. While you operate. Always keep in mind theCAUTIONS and WARNINGS. Perform your during(D) PMCS. If your equipment fails to operate, trou-bleshoot with the proper equipment and report anydeficiencies using the proper forms. See DA Pam738-750.

2-6. PMCS ProceduresYour preventive maintenance checks and services table lists the inspections and care of your equipmentthat will keep it in good working condition. The interval column tells you when to do the check or service.The procedure column tells you how to do them.Follow these instructions carefully.

B-BeforeD-During

Table 2-1. Operator/Crew Preventive Maintenance Checks and ServicesA-After M-MonthlyW-Weekly

ItemNo.

Interval Items to beinspected

Equipment is notready/available if:B D A W M Procedure

1 * GND ROD Check to see if GND ROD is Loose; see paragraph 2-1.properly placed and connected.Check to see if GND ROD is Bent; straighten if possible or replace.bent.

2 * Connectors Inspect for dents. Dents prevent proper connection ofpower unit cables; return J-box tohigher level maintenance facility.

Check to see if fittings are secure. Connectors are loose due to missing orloose screws; replace/tightenscrews, as necessary.I

2-3

TM 11 -611 5-472-1 3&P

B- BeforeD-During

Table 2-1. Operator/Crew Preventive Maintenance Checks and Services— ContinuedA-After M-MonthlyW-Weekly

ItemNo.

Interval Items to beinspected

Equipment is notready/available if:B D A W M Procedure

* Check to see if connection is se Cables are not connected or are loose;cure. reconnect or tighten, as appropri

ate.3 * SWITCHES Check to see if operable by mov Cannot be moved; return J-box to

ing from OFF to ON and back. higher level maintenance facility.4 * Lights Observe to see if lit. Unlit; remove/replace. If lights remain

offa. Check generators, load, all connections, to insure working properly.6. Return J-box to higher level maintenance facility.

5 * Box surface Inspect for dust/dirt. Clean using soft rag and trichlorotri-fluoroethane.

Inspect for scratches. Touch up with paint as necessary.6 • Side panel Insure side panel in place. Side panel removed; replace.

• Inspect for loose or missing Replace/ tighten screws, as necessary.screws.

7 * Protective flap Inspect rubber gasket for wear. Return J-box to higher level maintenance facility.

• Inspect for loose or missing Replace/tighten screws, as necessaryscrews.

Section IV. OPERATING INSTRUCTIONS2-7. Operating Under Normal Conditionsa. Install using instructions in paragraph 2-2above.b. Following procedures in TM 5-6115-275-14,start generator.c. To apply power to load, turn SWITCH to corresponding connector on. SWITCH GEN NO. 1 is usedin conjunction with POWER CABLE GEN NO. 1INPUT connector (Jl); SWITCH GEN NO. 2 is usedin conjunction with POWER CABLE GEN NO. 2INPUT connector (J2).d. To remove power from load, turn switch off.

2-8. Transferring to Second GeneratorNOTE

Alert load operator that there will be amomentary power loss.

a. Following procedures in TM 5-6115-275-14,start second generator.6. Turn first switch off before turning secondswitch on. Leave unused switch off except when par

allel generator operation is desired (see para 2-9,below). This is a safety feature,c. Stop first generator and service as necessary.

2-9. Parallel Operation of Generatorsa Following procedures in paragraph 2-7 above,hook up and operate both generators.

NOTEGenerators must be in phase synchronization,

6. When supplying power to load, both SWITCHGEN NO. 1 and SWITCH GEN NO. 2 are to be in theon position.c. More detailed information on paralleling andsynchronizing of AC power units can be found in FM20-31.

2-10. Operating Under Unusual Conditionsa. In extremely cold weather, do not touch J-boxwith bare hands.6. Do not stand in water while operating J-box.

Section V. PREPARATION FOR MOVEMENT2-11. The following procedures will befollowed when preparing the equipmentfor movement:

a. Ensure all switches are off.

6. Disconnect all couplings and grounding cablesand stow.c. Replace connector protective covers.d. Locate J-box on generator platform and secure.

I

2-4

TM 11 -611 5-472-1 3&P

CHAPTER 3MAINTENANCE

Section I. TROUBLESHOOTING PROCEDURES3-1. Generala. This table lists the common malfunctions whichyou may find during the operation or maintenance ofthe J-box or its components. You should perform thetests/inspections and corrective actions in the orderlisted.

b. This manual cannot list all malfunctions thatmay occur, nor all tests, inspections or correctiveactions. If a malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.

Table 3-1. Troubleshooting Chart

Malfunction Probable Cause Corrective Action

1. Switches (circuit breakers) trip off whenpower is on.

2. PILOT LIGHT GEN NO. 1 INPUT indicator (DS1) or PILOT LIGHTGEN NO. 2 INPUT indicator (DS2) lightoff.3. PILOT LIGHT OUTPUT indicator(DS3) or PILOT LIGHT OUTPUTindicator (DS4) light off.

Overload condition. Reset switch to on position. If switch trips off again, correctiveaction is necessaryInput connector bad.

Switch bad.

Input connector bad.Switches bad.Output connector bad.

Using multimeter, determine where overload is present and take necessary corrective action.Remove and replace.

Remove and replace.

Remove and replace.Remove and replace.Remove and replace.

Section II. MAINTENANCE PROCEDURES3-2. Replacing SWITCHa Unscrew SWITCH.b. Unscrew and remove side panel.c. Tag and remove wires to SWITCH,d Remove and replace SWITCH.e. Attach wires to SWITCH, remove tags.f. Replace screws under flap.g. Replace side panel.h. Using multimeter, test connection.

3-3. Replacing Connectora. Unscrew connector.b. Unscrew and remove side panel.c. Tag and remove wires to connector,d Remove and replace connector.e. Replace wires and remove tags.f. Replace screws on connector.g. Replace side panel.h. Using multimeter, test connection.

TM 11 -611 5-472-1 3&P

APPENDIX AREFERENCES

DA Pam 310-1 Consolidated Index of Army Publications and Blank Forms.DA Pam 738-750 The Army Maintenance Management System (TAMMS).FM 20-31 Electric Power Generation in the Field.TM 5-61 15-275-14 Operator's, Organizational, Direct Support, General Support, and Depot Main

tenance Manual: Generator Set, Gasoline Engine Driven, Skid Mounted,Tubular Frame, 10KW, AC, 120/208V, 3 Phase, and 120/240V, Single Phase,Less Engine, DOD Models MEP-018A, 60 Hz, (NSN 6115-00-889-1447)and MEP-323A, 400 Hz (6115-00-26-0843).

TM 740-90-1 Administrative Storage of Equipment.TM 750-244-2 Procedures for Destruction of Electronics Materiel to Prevent Enemy Use

(Electronics Command).

A-l/(A-2 blank)

TM11 -611 5-472- 13&P

APPENDIX BMAINTENANCE ALLOCATION

Section I. INTRODUCTIONB-l. GeneralThis appendix provides a summary of the maintenance operations for the J-3748/G. It authorizes categories of maintenance for specific maintenancefunctions on repairable items and components andthe tools and equipment required to perform eachfunction. This appendix may be used as an aid inplanning maintenance operations.

B-2. Maintenance FunctionMaintenance functions will be limited to and definedas follows:a. Inspect To determine the serviceability of anitem by comparing its physical, mechanical, and/orelectrical characteristics with established standardsthrough examination.b. Test. To verify serviceability and detect incipient failure by measuring the mechanical or electricalcharacteristics of an item and comparing those characteristics with prescribed standards.c. Service. Operations required periodically tokeep an item in proper operating condition, i.e., toclean (decontaminate), to preserve, to drain, to paint,or to replenish fuel, lubricants, hydraulic fluids, orcompressed air supplies.d. Adjust. To maintain, within prescribed limits,by bringing into proper or exact position, or by setting the operating characteristics to the specifiedparameters.e. Align. To adjust specified variable elements ofan item to bring about optimum or desired performance.f. Calibrate. To determine and cause corrections tobe made or to be adjusted on instruments or testmeasuring and diagnostic equipments used in precision measurement. Consists of comparisons of twoinstruments, one of which is a certified standard ofknown accuracy, to detect and adjust any discrepancy in the accuracy of the instrument being compared.g. Install The act of emplacing, seating, or fixinginto position an item, part, module (component orassembly) in a matter to allow the proper functioningof the equipment or system.h. Replace. The act of substituting a serviceablelike type part, subassembly, or module (componentor assembly) for an unserviceable counterpart.

i. Repair. The application of maintenance services(inspect, test, service, adjust, align, calibrate, replace) or other maintenance actions (welding, grinding, riveting, straightening, facing, remachining, orresurfacing) to restore serviceability to an item bycorrecting specific damage, fault, malfunction, orfailure in a part, subassembly, module (component orassembly), end item, or system./ Overhaul That maintenance effort (service/action) necessary to restore an item to a completelyserviceable/operational condition as prescribed bymaintenance standards (i.e., DMWR) in appropriatetechnical publications. Overhaul is normally thehighest degree of maintenance performed by theArmy. Overhaul does not normally return an item tolike new condition.k. Rebuild. Consists of those services/actions necessary for the restoration of unserviceable equipment to a like new condition in accordance with original manufacturing standards. Rebuild is the highestdegree of materiel maintenance applied to Armyequipment. The rebuild operation includes the act ofreturning to zero those age measurements (hours,miles, etc.) considered in classifying Armyequipments/components.

B-3. Column Entriesa. Column 1, Group Number. Column 1 lists groupnumbers, the purpose of which is to identify components, assemblies, subassemblies and modules withthe next higher assembly.6. Column 2. Component/Assembly. Column 2 contains the noun names of components, assemblies,subassemblies, and modules for which maintenanceis authorized.c. Column 3, Maintenance Functions. Column 3lists the functions to be performed on the item listedin column 2. When items are listed without maintenance functions, it is solely for purpose of having thegroup numbers in the MAC and RPSTL coincide.d. Column 4, Maintenance Category. Column 4specifies, by the listing of a "work time" figure in theappropriate subcolumn (s), the lowest level of maintenance authorized to perform the function listed incolumn 3. This figure represents the active time required to perform that maintenance function at theindicated category of maintenance. If the number or

B-l

TM11-6115-472-13&P

complexity of the tasks within the listed maintenance function vary at different maintenance categories, appropriate "work time" figures will be shownfor each category. The number of task-hours specified by the "work time" figure represents the averagetime required to restore an item (assembly, subas-sembly, component, module, end item or system) to aserviceable condition under typical field operatingconditions. This time includes preparation time,troubleshooting time, and quality assurance/qualitycontrol time in addition to the time required to perform the specific tasks identified for the maintenancefunctions authorized in the maintenance allocationchart. Subcolumns of column 4 are as follows:

C— Operator/CrewO— OrganizationalF— Direct SupportH—General SupportD—Depote. Columns, Tools and Equipment. Column 5 specifies by code, those common tool sets (not individualtools) and special tools, test, and support equipmentrequired to perform the designated function.f. Column 6, Remarks. Column 6 contains an alphabetic code which leads to the remark in sectionIV, Remarks, which is pertinent to the item oppositethe particular code.

B-4. Tool and Test Equipment Requirements(Sect. Ill)

a. Tbol or Test Equipment Reference Code. Thenumbers in this column coincide with the numbersused in the tools and equipment column of the MAC.The numbers indicate the applicable tool or testequipment for the maintenance functions.b. Maintenance Category. The codes in thiscolumn indicate the maintenance category allocatedthe tool or test equipment.c. Nomenclature. This column lists the noun nameand nomenclature of the tools and test equipmentrequired to perform the maintenance functions.d. National/NATO Stock Number. This columnlists the National/NATO stock number of the specifictool or test equipment.e. Tbol Number. This column lists the manufacturer's part number of the tool followed by the FederalSupply Code for manufacturers (5-digit) in parentheses.

B-5. Remarks (Sect. IV)a. Reference Code. This code refers to the appropriate item in section II, column 6.6. Remarks. This column provides the required explanatory information necessary to clarify items appearing in section II.

(Next printed page is B.3)

B-2

TH 11-6115-472-138PSECTION II MAINTENANCE ALLOCATION CHART

FOR

POWERTRANSFERBOXJ-3748/G

(1) (2)COMPONENT/ASSEMBLY

(3)MAINTENANCEFUNCTION

(4)MAINTENANCE CATEGORY (5)TOOLS

ANDEQPT.

(6)REMARKSGROUP

NUMBER C O F H D

00 POWERTRANSFERBOXASSY(SC-D-881063)(MTBF- 50,000)

InspectTest

0.2

Test0.1

0.211,2

ReplaceRepairRepair

0.50.3

1.0A

B-3

2314-79

TM 11-6115-472-13&PSECTION JH TOOL AND TEST EQUIPMENT REQUIREMENTS

TOR

POWERTRANSFERBOXJ-3748/G

TOOL OR TESTEQUIPMENTREF CODE

MAINTENANCECATEGORY NOMENCLATURE

NATIONAL/NATOSTOCK NUMBER TOOL NUMBER

1 0. F MULTIMETERAN/URM-105 6625-00-581-2036

2 F TOOLKIT, ELECTRONICEQUIPMENTTK-100/G 5180-00-605-0079

B-4 HIS«-F»1111.7710.17; 6013

TH 11-6115-472-134P

SECTION IV. REMARKS

REFERENCECODE REMARKS

REPAIR IS BY REPLACEMENT OF LAMPS AND GASKETS.

I B-5/(B-6 blank)

TM 11 -611 5-472-1 3&P

I APPENDIX CREPAIR PARTS AND SPECIAL TOOLS LIST

I

SECTION I. INTRODUCTIONC-l. ScopeThis manual lists and authorizes spares and repair parts; special tools; special test, measurement, and diagnostic equipment (TMDE); and other special support equipment required for performance of organizational,direct support and general support; maintenance of the J-3748/G. It authorizes the requisitioning, issue, anddisposition of spares, repair parts and special tools as indicated by the source, maintenance and recoverability(SMR) codes.

C-2. GeneralThis Repair Parts and Special Tools List is divided into the following sections:a. Section II. Repair Parts List A list of spares and repair parts authorized by this RPSTL for use in theperformance of maintenance. The list also includes parts which must be removed for replacement of theauthorized parts. Parts lists are composed of functional groups in ascending numeric sequence, with the parts ineach group listed in ascending item number sequence.6. Section III. Special Tools List Not applicable.c. Section IV. National Stock Number and Part Number Index. A list, in National item identification number(NUN) sequence, of all National stock numbered items appearing in the listing, followed by a list in alphamericsequence of all part numbers appearing in the listings. National stock numbers and part numbers are cross-referenced to each illustration figure and item number appearance.

C-3. Explanation of Columns (Section II and III)a. Item No. (Column 1)). Indicates the number used to identify items called out in the illustration.b. SMR Code (Column (2)). The source, maintenance, and recoverability (SMR) code is a five-position codecontaining supply/requisitioning information, maintenance category authorization criteria, and dispositioninstruction, as shown in the following breakout:

SourceCode

XX

MaintenanceCode

RecoverabilityCode

11st twopositions XX

How you get an item. 3d position

Who can install, replace oruse the item.

4th position

Who can docomplete repair(see note) on theitem.

IWho determinesdispositionaction on anunserviceableitem.

NOTEComplete repair: Maintenance capacity, capability, and authority to perform allcorrective maintenance tasks of the "Repair" function in a use/user environment in order to restore serviceability to a failed item.

C-l

TM11-6115-472-13&P

(1) Source code. The source code tells you how to get an item needed for maintenance, repair, or overhaul ofan end item/equipment. Explanations of source codes follows:

Code

PAPBPCPDPEPFPG

KDKFKB

MO— Made at org/AVUM category

MF- Made at DS/AVUM category

MH-MadeatGScategory

ML— Made at Specialized Repair Activity(SRA)

MD— Made at Depot

AO— Assembledby org/AVUM category

AF— AssembledbyDS/AVIM category

AH— Assembledby GS category

AL— Assembledby SRA

AD— Assembledby Depot

Explanation

Stocked items; use the applicable NSN to request/requisition itemswith these source codes. They are authorized to the category indicated by the code entered in the third position of the SMR code.

NOTEItems coded PC are subject to deterioration.

Items with these codes are not to be requested/requisitioned individually. They are part of a kit which is authorized to the maintenancecategory indicated in the third position of the SMR code. The complete kits must be requisitioned and applied.

Items with these codes are not to be requested/requisitioned individually. They must be made from bulk material which is identified bythe part number in the description and usable on code (UOC) columnand listed in the Bulk Material group of the repair parts list. If theitem is authorized to you by the third position code of the SMR code,but the source code indicates it is made at a higher category, orderthe item from the higher category of maintenance.

tItems with these codes are not to be requested/requisitioned individually. The parts that make up the assembled item must be requisitioned or fabricated and assembled at the category of maintenanceindicated by the source code. If the disposition code of the SMR codeauthorizes you to replace the item, but the source code indicates theitem is assembled at a higher category, order the item from thehigher category of maintenance.

Code Explanation

XA— Do not requisition an "XA" coded item. Order its next higher assembly.XB— If an "XB" item is not available from salvage, order it using the FSCM and part number given.XC— Installation drawing, diagram, instruction sheet, field service drawing, that is identified by manufactur

ers part number.XD— Item is not stocked. Order an "XD" coded item through normal supply channels using the FSCM and

part number given, if no NSN is available.

C-2

TM 11-41 15-472-13&P

NOTECannibalization or controlled exchange, when authorized, may be used as asource of supply for items with the above source codes, except for those sourcecoded "XA" or those aircraft support items restricted by requirements of AR750-1.

(2) Maintenance code. Maintenance codes tell you the category of maintenance authorized to USE andREPAIR support items. The maintenance codes are entered in the third and fourth positions of the SMR codeas follows:

(a) The maintenance code entered in the third position tells you the lowest maintenance categoryauthorized to remove, replace, and use an item. The maintenance code entered in the third position will indicateauthorization to one of the following categories of maintenance.

Code Application/ExplanationC— Crew or operator maintenance done within organizational or aviation maintenance.O— Organizational or aviation unit category can remove, replace, and use the item.F— Direct support or aviation intermediate category can remove, replace, and use the item.H— General support category can remove, replace, and use the item.L— Specialized repair activity can remove, replace, and use the item.D— Depot category can remove, replace, and use the item.

(b) Themaintenance code entered in the fourth position tells whether or not the item is to be repaired andidentifies the lowest maintenance category with the capability to do complete repair (i.e., perform all authorizedrepair functions). This position will contain one of the following maintenance codes.

NOTESome limited repair may be done on the item at a lower category of maintenance, if authorized by the Maintenance Allocation Chart (MAC) and SMRcodes.

Code Application/ExplanationO— Organizational or aviation unit is the lowest category that can do complete repair of the item.F— Direct support or aviation intermediate is the lowest category that can do complete repair of the item.H— General support is the lowest category that can do complete repair of the item.L— Specialized repair activity (designate the specialized repair activity) is the lowest category that can do

complete repair of the item.D— Depot is the lowest category that can do complete repair of the item.Z— Nonreparable. No repair is authorized.B— No repair is authorized. (No parts or special tools are authorized for the maintenance of a "B" coded item).

However, the item may be reconditioned by adjusting, lubricating, etc., at the user category.(3) Recoverability code. Recoverability codes are assigned to items to indicate the disposition action on

unserviceable items. The recoverability code is entered in the fifth position of the SMR Code as follows:

Recoverabilitycodes Application/ExplanationZ— Nonreparable Item. When unserviceable, condemn and dispose of the item at the category of maintenance

shown in the third position of SMR Code.O— Reparable item. When uneconomically reparable, condemn and dispose of the item at organizational oraviation unit category.

F— Reparable item. When uneconomically reparable, condemn and dispose of the item at direct support oraviation intermediate category.

H— Reparable item. When uneconomically reparable, condemn and dispose of the item at general supportcategory.

D— Reparable item. When beyond lower category repair capability, return to depot. Condemnation anddisposal of item not authorized below depot category.

L— Reparable item. Condemnation and disposal not authorized below specialized repair activity (SRA).A— Item requires special handling or condemnation procedures because of specific reasons (e.g., precious metal

content, high dollar value, critical material, or hazardous material). Refer to appropriate manuals/directives for specific instructions.

TM 11-41 15-472-1 3ft P

c. FSCM (Column (3)). The Federal Supply Code for Manufacturer (FSCM) is a 5-digit numeric code which isused to identify the manufacturer, distributor, or Government agency, etc., that supplies the item. Ad. Part Number (Column (4)). Indicates the primary number used by the manufacturer (individual, company, Bfirm, corporation, or Government activity), which controls the design and characteristics of the item by meansof its engineering drawings, specifications, standards, and inspection requirements to identify an item or rangeof items.

NOTEWhen you use a NSN to requisition an item, the item you receive may have adifferent part number from the part ordered.

e. Description and Usable on Code (UOC) (Column (5)). This column includes the following information.(1) The Federal item name and, when required, a minimum description to identify the item.(2) The statement "END OF FIGURE" appears just below the last item description in Column (5) for a

given figure in both section II and section III.f. Qty (Column 6)). Indicates the quantity of the item used in the breakout shown on the illustration figure,which is prepared for a functional group, subfunctional group, or an assembly.

C-4. Explanation of Columns (Section IV)a. National Stock Number (NSN) Index.(1) Stock number column. This column lists the NSN by National item identification number (NUN)

sequence. TheNUN consists of the last nine digits of the NSN. When using this column to locate an item, ignorethe first four digits of the NSN. When requisitioning items use the complete NSN (13 digits).(2) Fig. column. This column lists the number of the figure where the item is identified/located. The

illustrations are in numerical sequence in sections II and III.(3) Item column. The item number identifies the item associated with the figure listed in the adjacent Fig.

column. This item is also identified by the NSN listed on the same line.6. Part Number Index. Part numbers in this index are listed by part number in ascending alphamericsequence. «(1) FSCM column. This column lists the Federal supply code for manufacturer (FSCM). Tj(2) Part number column. This column indicates the part number assigned to the item.(3) Stock number column. This column lists the National stock number for the associated part number and

manufacturer identified in the part number and FSCM columns to the left.(4) Fig. column. This column lists the number of the figure where the item is identified/located in sections II

and III.(5) Item column. The item number is that number assigned to the item as it appears in the figure referenced

in the adjacent figure number column.

C-5. Special InformationNational stock numbers (NSN's) that are missing from P source coded items have been applied for and will beadded to this TM by future change/revision when they are entered in the Army Master Data File (AMDF). Untilthe NSN's are established and published, submit exception requisitions to: Commander, US Army Communications-Electronics Command and Fort Monmouth, ATTN: AMSEL-MM, Fort Monmouth, NJ 07703-5006 forthe part required to support your equipment.

C-6. How to Locate Repair Partsa When National stock number or part number is not known.(1) First Using the table of contents, determine the assembly group or subassembly group to which the

item belongs. This is necessary since figures are prepared for assembly groups and subassembly groups, andlistings are divided into the same groups.(2) Second. Find the figure covering the assembly group or subassembly group to which the item belongs.(3) Third. Identify the item on the figure and note the item number.(4) Fourth. Refer to the Repair Parts List for the figure to find the part number for the item number noted

on the figure.(5) Fifth. Refer to the Part Number Index to find the NSN, if assigned. I

C-4

TM 11 -611 5-472-1 3&P

6. When National stock number or part number is known.(1) First Using the index of National stock numbers and part numbers, find the pertinent National stock

number or part number. The NSN index is in National item identification number (NUN) sequence (para 4a(l)).The part numbers in the part number index are listed in ascending alphameric sequence (para 46). Both indexescross-reference you to the illustration figure and item number of the item you are looking for.(2) Second. After finding the figure and item number, verify that the item is the one you're looking for, then

locate the item number in the repair parts list for the figure.

C-7. AbbreviationsNot applicable.

TM 11-6115-472-13&P

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TM 11-6115-472-13&P

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I(1) (2) (3)ITEM SMRNO CODE FSCM

(4) (5)

SFCTION II TM11-6115-472-13SP(1) (2) (3)ITEM SMRNO CODE FSCM

(4) (5) (6)PARTNUMBER DESCRIPTION AND USABLE ON CODES(UOC) QTY

47 PAFZZ 96906 MS90725-7 SCREW, CAP, HEXAGON H..... . 248 PAFZZ 82163 DGN-13RP TERMINAL 549 PAFZZ 96906 MS35335-93 WASHER, LOCK 550 PAFZZ 96906 MS16203-67 NUT, PLAIN, HEXAGON 551 PAFZZ 80063 SC-C-881 481-1 LEAD, ELECTRICAL 152 PAFZZ 80063 SC-C-881481-2 LEAD, ELECTRICAL 153 PAFZZ 80063 SC-C-881475-5 LEAD, ELECTRICAL I54 PAFZZ 80063 SC-C-381 475-7 LEAD, ELECTRICAL 155 XBFZZ 80063 SC-C-881536 PANEL, INSULATOR I56 PAFZZ 80063 SC-C-881481-3 LEAD, ELECTRICAL 157 PAFZZ 80063 SC-C-881481-4 LEAD, ELECTRICAL 158 PAFZZ 80063 SC-C-881481-5 LEAD, ELECTRICAL 159 PAFZZ 80063 SC-C-881481-6 LEAD, ELECTRICAL 160 XBFZZ 80063 SC-C-881535 FILLER, INSULATOR 161 XBFZZ 80063 SC-B-881438 BUS BAR 162 PAFZZ 80063 SC-C-881475-3 LEAD, ELECTRICAL *.. 163 PAFZZ 80063 SC-C-881 475-1 LEAD, ELECTRICAL 164 PAFZZ 80063 SC-C-881475-6 LEAD, ELECTRICAL 165 PAFZZ 80063 SC-C-881475-8 LEAD, ELECTRICAL i66 PAFZZ 80063 SC-C-381398 WIRE ASSY. GROUND 167 PAFZZ 80063 SC-B-881392 SCREW, CAP 468 PAF7Z 96906 MS35425-39 NUT, PLAIN, WING 469 XBFZZ 80063 SC-C-881538 PANEL, INSULATOR 170 XBFZZ 80063 SC-C-881427 COVER, PROTECT.ASSY 171 PAFZZ 96906 MS35309-361 SCREW, CAP, HEX 8

7? PAFZZ 96906 MS15795-914 WASHER, FLAT 8

73 PAFZZ 96906 MS51922-19 NUT, SELF-LOCKING, HE 8

74 XBFZZ 80063 SC-C-88 1423-1 PLATE DESIGNATION 275 PAFZZ 96906 MS35206-227 SCREW, MACHINE.... 1276 PAFZZ 96906 MS35338-41 WASHER, LOCK 1277 PAFZZ 96906 MS27183-6 WASHER, FLAT 1278 XBFZZ 80063 SC-C-881423-3 PLATE DESIGNATION 179 XBFZ7 80063 SC-C-88 1423-2 PLATE DESIGNATION 1

END OF FIGURE

I

C-l-2

SECTION IV TM1 1-6115-472-13GP

NATIONAL STOCK NUMBER AND PART NUMBER INDEX

NATIONAL STOCK NUMBER INDEXSTOCK NUMBER FIG. ITEM STOCK NUMBER FIG. ITEM5310-00-009-7694 C-l 505310-00-022-8847 C-l 425310-00-045-3296 C-l 45310-00-045-4007 C-l 765310-00-045-5214 C-l 725310-00-080-8495 C-l 685310-00-082-1404 C-l 775310-00-184-8971 C-l 385305-00-225-3840 C-l 475310-00-543-4717 C-l 445310-00-584-7995 C-l 4053AO-00-801-2957 C-l 315310-00-809-4058 C-l 465310-00-809-8546 C-l 55310-00-877-5797 C-l 376710-00-900-9423 C-l 135310-00-948-9708 C-l 495305-00-984-4984 C-l 755305-00-984-6194 C-l 325305-00-993-1848 C-l 35310-00-997-1888 C-l 455310-01-026-5824 C-l 395310-01-034-2835 C-l 73

C- 1-1

SECTION IV TH 11-6 11 5-472- 13£PNATIONAL STOCK NUMBER AND PART NUMBER INDEX

FSCM PART NUMBER

74193 AM3-AO-6G88044 AN961-616T82168 DGN-13RP96906 MS15795-91496906 MS16203-2796906 MS16203-3996906 MS16203-6796906 MS18012-596906 MS21044N396906 MS27183-1096906 MS27183-696906 MS27183-896906 MS35206-22796906 MS35206-24696906 MS35207-26596906 MS35309-36196906 MS35333-UO96906 MS35335-9396906 MS35338-10396906 MS35338-4196906 MS35338-4396906 MS35425-2896906 MS35425-3996906 MS35649-225296906 MS51922-1996906 MS90725-780063 SC-B-88139280063 SC-B-88143880063 SC-C-539759-280063 SC-C-38139880063 SC-C-88139980063 SC-C-88141180063 SC-C-88141380063 SC-C-88141480063 SC-C-88141780063 SC-C-88142280063 SC-C-881423-l80063 SC-C-881423-280063 SC-C-881423-380063 SC-C-88142780063 SC-C-88142880063 SC-C-88143980063 SC-C-88144680063 SC-C-88145680063 SC-C-88145780063 SC-C-88146080063 SC-C-88146180063 SC-C-88146480063 SC-C-88146580063 SC-C-88146980063 SC-0881470

PART NUMBER INDEXSTOCK NUMBER

5310-00-045-52145310-00-584-79955310-01-026-58245310-00-009-76945340-00-801-29575310-00-877-57975310-00-809-40585310-00-082-14045310-00-809-85465305-00-984-49845305-00-984-61945305-00-993-1848

5310-00-022-88475310-00-948-97085310-00-184-89715310-00-045-40075310-00-045-32965310-00-543-47175310-00-080-84955310-00-997-18885310-01-034-28355305-00-225-3840

FIG.C-C-C-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-c-t^c-c-c-c-c-c-c-c-c-c-c-c-c-c-

ITEM

34434872403950313746775753237142493876444684573476761866628182415117479787091472012192627172221

C-I-2

SECTION IV TM11-6115-472-13EP

ft

NATIONAL STOCK NUMBER AND PART NUMBER INDEX

FSCM PART NUMBER

80063 SC-C-88147380063 SC-C-881475-180063 SC-C-P81475-280063 SC-C-881475-380063 SC-C-88 1475-480063 SC-C-881475-580063 SC-C-881475-680063 SC-C-831475-780063 SC-C-881475-880063 SC-C-881481-180063 SC-C-881481-280063 SC-C-881481-380O63 SC-C-881481-480O63 SC-C-881481-580O63 SC-C-88 1481-680O63 SC-C-88148380063 SC-C-88153580O63 SC-C-88153680063 SC-C-88153780063 SC-C-88153880063 SC-C-88153980063 SC-D-88106680063 SC-D-88140080063 SC-D-88140880063 SC-D-881^0980063 SC-D-88141080063 SC-D-88141272619 181-8836-0931-55

3

PART NUMBER INDEXSTOCK NUMBER FIG. ITEM

6210-00-900-9423

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C-I-3

RECOMMENDED CHANGES TO EQUIPMENT TECHNICAL PUBLICATIONSI

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(Jk\ mmi iffl® SfflSODIBtl) W"TH THIS PUBLICATION?

FROM (PRINT YOUR UNIT'S COMPLETE ADDRESS)/ [THEN JOT DOWN THE ^ CommanderStateside Army DepotATTN: AMSTA-US ,„,Stateside, N.J. 07703-5007f f DOPE ABOUT IT ON THISK^J FORM. CAREFULLY TEAR ITU v, OUT. FOLD IT AND DROP IT

3\ \JN THE MAIL' ^ DATE SENT

PUBLICATION NUMBER PUBLICATION DATE PUBLICATION TITLE

^ ^ 10 July 1975

TM 11-5840-340-20P 23 Jan 78 Radar Set AN/PRC-76BE EXACT PIN-POINT WHERE IT IS IN THIS SPACE TELL WHAT IS WRONG

AND WHAT SHOULD BE DONE ABOUT IT:PAGENO

PARAGRAPH

FIGURENO

TABLENO

33 For item 2, change the NSN to read: 5835-00-134-9186.Reason: Accuracy.

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AND GIVE IT TO YOUR HEADQUARTERS

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FILL IN YOURUNIT'S ADDRESSV FOLD BACK

DEPARTMENT OF THE ARMY

OFFICIAL BUSINESSPENALTY FOR PRIVATE USE $300

POSTAGE AND FEES PAIDDEPARTMENT OF THE ARMY

DOD 314

CommanderUS Army Communications-Electronics Commandand Fort MonmouthATTN: AMSEL-ME-MPFort Monmouth, New Jersey 07703-5007

RECOMMENDED CHANGES TO EQUIPMENT TECHNICAL PUBLICATIONSI IfST.rHEN...JOT DOWN THE}^DCffld'HCilOG!]!! l^BdJLlKl WITH THIS PUBLICATION?.> /^T^ 6 \DOPE ABOUT IT ON THISrmi~ORM. CT OUT :AREFULLY TEARPUBLICATION NUMBER PUBLICATION DATE PUBLICATION TITLE

JROP n- n, -rue- i, A ,, DATE SENTIN THE MAIL. J

TM 11-6115-472-13&P 10 Sept 1985 power Transfer Box 0-3748/QBE EXACT PIN-POINT WHERE IT IS IN THIS SPACE TELL WHAT IS WRONG

AND WHAT SHOULD BE DONE ABOUT IT:PAGENO.

PARAGRAPH

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TABLENO.

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DA FORM 2028-2 PREVIOUS EDITIONS P.S.--IF YOUR OUTFIT WANTS TO KNOW ABOUT YOUR'-•''» 1 JOU '» fcWfcU *. ABp OR^ni ETP DCrOAAMCKinATinKI AAAtCCA rADO^IKI /-/^DCnc TUI

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OFFICIAL BUSINESSPENALTY FOR PRIVATE USE $300

POSTAGE AND FEES PAIDDEPARTMENT OF THE ARMY

UOO 314

CommanderUS Army Communications-Electronics Commandand Fort MonmouthATTN: AMSEL-ME-MPFort Monmouth, New Jersey 07703-5007

By Order of the Secretary of the Army:

JOHN A. WICKHAM JR.General, United States Army

Official: Chief of Staff

DONALD J. DELANDROBrigadier General, United States Army

The Adjutant General

DISTRIBUTION:To be distributed 1n accordance with DA Form 12-36 literature

requirements for J-3748/6.

ft U.S. GOVERNMENT PRINTING OFFICE: 1986-505-044/20139