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 408 of 1258

TM 9-2320-280-34

6 - 6.

STARTER REPAIR (Cont ’d)

6.

Connect 24-volt supply to starter motor (10).

CAUTION

Do not operate starter motor for more than 30 seconds at a time.

Allow starter motor to cool at least 2 minutes between tests or

damage to starter motor may result.

7.

Close switch (9), adjust voltage to 20 volts on voltmeter (13) using carbon pile (12), and check

rotating speed of armature with tachometer.

Check current draw on ammeter (11).

8.

Maximum current draw should be 65 amperes with a minimum armature speed of 5,000 rpm.

If low

speed, high current draw condition exists, check bearing alignment or inspect armature for shorts or

grounds.

If low speed, low current draw exists, inspect start motor for faulty connections or poor

brush contact.

FOLLOW-ON TASK:

Install starter (TM 9-2320-280-20).

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