TM-9-2320-280-34
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
JANUARY 1996
TM-9-2320-280-34 - Page 363 of 1258
6 - 5 . 200 AMPERE ALT E R N ATOR (12338796-1) TESTING AND REPA
I R
This task covers:
a.
Alternator Output Testing
d.
Cleaning
b.
Disassembly
e.
Assembly
c.
Static Testing
a. Alternator Output Testing
1.
Mount pivot arm of 500 amp test stand to high speed side and screw mounting flange adapter to
pivot arm. Connect pulley drive shaft to high speed head. Screw pulley drive shaft to mounting
flange adapter.
2.
Mount alternator to starter/alternator mounting bracket on 500 amp test stand. Connect “V” belt
from 500 amp test stand pulley to alternator pulley. Adjust belt tension.
3.
Connect cable from alternator ground terminal to 500 amp test stand “G-” terminal. Connect cable
from alternator “Bat” terminal to 500 amp test stand “G+” terminal. Connect cable from alternator
regulator “IGN” to 500 amp test stand “F” terminal.
4.
Make a jumper wire with a ring terminal at both ends. Connect jumper wire on 500 amp test stand
from IGN SWITCH terminal to “F-B” terminal.
5.
Set 500 amp test stand as follows:
Model GSAR-500
Model AGT-99A
(a) DC ammeter load and starter selector
X10
500 amp
(b) DC ammeter field and battery charge selector
X1
5 amp
(c) Field circuit switch
Regulator
Regulator
(d) DC voltmeter circuit selector
RECT/GEN
RECT/GEN
6.
Turn 500 amp test stand master power switch and master load switch to “ON” and battery switch to
24V DC. Green lamp on 500 amp test stand must illuminate.
INITIAL SETUP:
Applicable Models
_______________
M996, M996A1, M997, M997A1, M997A2
To o l s
____
General mechanic's tool kit:
automotive (Appendix G, Item 1)
Puller (Appendix G, Item 136)
Test Equipment
_____________
Multimeter (Appendix G, Item 120)
Test stand (Appendix G, Item 94)
M a t e r i a l s / P a rt s
____________
Sealing Compound (Appendix B, Item 57)
Sealant (Appendix B, Item 43)
Locknut (Appendix E, Item 63)
Eighteen locknuts (Appendix E, Item 64)
Three lockwashers (Appendix E, Item 87)
Twelve locknuts (Appendix E, Item 65)
Personnel Require d
________________
One mechanic
One assistant
Manual Refere n c e s
________________
TM 9-2320-280-20
TM 9-2320-280-24P
TM 9-4910-663-12
TM 9-4910-485-12
Equipment Condition
_________________
Alternator removed (TM 9-2320-280-20).
General Safety Instructions
______________________
Always support alternator core and shaft assembly
during removal and installation.
Maintenance Level
_______________
Direct support
TM 9-2320-280-34
6 - 3 8
Change 1
NOT E
Prior to operation of the test stand, make certain that all switches
and controls are in the “initial” positions as referenced in:
Operator and Maintenance Manual, TM 9-4910-663-12 (UMC
Model GSAR-500), or Operator and Maintenance Manual, TM 9-
4910-485-12 (Sun Model AGT-99A).
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