Section X. MAINTENANCE OF ELECTRICAL SYSTEM

TM10-3930-242-12

Figure 4-19. Fan belt tension control spring, and bracket pulley, removal and installation.

Section

MAINTENANCE

ELECTRICAL

SYSTEM

WARNING

7052-103 is a part of adapter set NSN

4910-00-348-7600).

Drycleaning solvent, P-D-680, used to

(2) When a high-charging rate with fully

clean parts is potentially dangerous to

personnel and property. Do not use near

charged batteries is indicated, operate the unit at

open flame or excessive heat. Flash point

half throttle and disconnect the field jumper. If the

of solvent is 138F.

output remains high, the fault is in the generator. If

the output drops to zero, the fault is in the

4-32. General

regulator. Replace a defective regulator and/or

This section contains information for organizational

generator.

maintenance of the electrical system.

(3) When a low or no-charging rate with par-

WARNING

tially or fully discharged batteries, inspect for loose

Before disconnecting any electrical

connections or damaged wiring. If none are found,

components, make sure battery cables are

stop the engine and disconnect the field jumper.

disconnected at batteries to prevent a

Momentarily connect a jumper wire between the

serious bum or shock to personnel or

field terminal and the positive terminal of the

damage to equipment. Disconnect bat-

batteries to polarize the generator. Reconnect the

tery ground cable first. When recon-

field jumper and start the engine. If the charging

necting batteries, starter, or any bare,

rate does not increase as the engine speed is in-

unprotected wires, coat with silicone

creased, slow the engine and connect a jumper wire

rubber adhesive.

between the armature and field terminals. If the

charging rate does not increase as the engine speed

4-33. Engine Generator

is increased, the generator is faulty. Replace a

a On-Equipment Testing of Generator and

defective generator and/or regulator.

Voltage Regulator.

b. Removal.. Refer to figure 4-21 and remove the

(1) Refer to figure 4-20 and install adapter P/N

engine generator.

7052-103 in the generator receptacle. (Adapter, P/N

c. Cleaning and Inspection.

4-21