Section X. MAINTENANCE OF THE ELECTRICAL SYSTEM

TM 10-3930-634-12

(2) Move the radiator fan control lever to the ON

position to facilitate installation of the spring. Install

spring. Move fan control lever to off position.

Figure 4-17.

Section X. MAINTENANCE OF THE ELECTRICAL SYSTEM

4-32. General

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

This section contains information on the maintenance

or fully discharged batteries is indicated, inspect for

of the electrical system which is the responsibility of

loose connections or damaged wiring. If none are

organizational maintenance personnel.

found, stop the engine and disconnect the field jumper.

Momentarily connect a jumper wire between the

WARNING

generator field terminal and the positive terminal of

Before disconnecting any electrical compo-

the batteries to polarize the generator. Reconnect the

nents, make sure battery cables are discon-

field jumper and start the engine. If the charging rate

nected at batteries to prevent a serious burn

does not increase as the engine speed is increased, slow

or shock to personnel or damage to the equip-

the engine and connect a jumper wire between the ar-

ment. Disconnect battery ground cable first.

mature and field terminals. If the charging rate does

When reconnecting batteries, starter or any

not increase as the engine speed is increased, the

bare, unprotected wires, coat with silicone

generator is faulty. Replace defective generator and/or

rubber adhesive.

regulator.

4-33. Engine Generator

b. Removal. Remove right engine side panel. Refer to

a. On-Equipment Testing of Generator and Voltage

figure 4-19 and remove engine generator.

Regulator.

c. Cleaning and Inspection.

(1) Refer to figure 4-18 and install a suitable

(1) Clean generator housing and bracket with an

adapter in the generator receptacle.

approved cleaning solvent.

(2) When a high-charging rate with fully charged

(2) Inspect the generator and bracket for cracks,

batteries is indicated, operate the unit at half throttle

breaks, and loose or worn bearings. Check wiring for

and disconnect the field jumper. If the output remains

cuts and deterioration.

high, the fault is in the generator. If the output drops to

d. Installation. Refer to figure 4-19 and install the

zero, the fault is in the regulator. Replace a defective

generator and/or regulator.

engine generator.

4-16