SECTION II. TROUBLESHOOTING.

TM 9-2920-252-34&P

SECTION II. TROUBLESHOOTING.

2-4. TROUBLESHOOTING.

(1) If internal binding prevents manual rotation

of drive shaft, remove oil pump assembly. (Refer to

Chapter 3, Section II for disassembly instructions.)

a. Troubleshooting by DS/GS personnel will be

limited to manual checks for rotational freedom and

electrical resistance checks of internal circuits.

(a) Try manual rotation of the drive shaft for

the oil pump assembly, and again try manual rotation of

the generator drive shaft.

b. Repair of the regulator by DS/GS maintenance is

not authorized, so the troubleshooting is limited to

electrical resistance checks which might verify suspected

(b) If binding is felt in oil pump drive shaft,

malfunction and identify which internal circuit is at fault.

install a replacement oil pump assembly. (Refer to

Chapter 3, Section III for assembly instructions.)

c. Generator Rotational Freedom Check. Try to

rotate the generator drive shaft by hand. The drive shaft

(2) If generator drive shaft does not bind, but

should turn freely, but inertia of rotor (resistance due to

there is no rotor resistance, shaft may be broken.

rotor's weight) should be sensed as rotation starts or is

Remove drive shaft assembly. (Refer to Chapter 3,

stopped.

Section II for disassembly instructions.) Inspect removed

parts for damage.

2-2