CHAPTER 4 REPAIR OF ELECTRICAL SYSTEM

TM 10-3930-630-34

CHAPTER 4

REPAIR OF ELECTRICAL SYSTEM

Section I. ALTERNATOR

(3) Remove three thru bolts (10) from

4-1.

Description.

alternator frames.

a. The fork lift truck electrical system

(4) Scribe a mark on frames (11 and 14).

provides power for the lights, horn, gages and for

Use a screwdriver to pry the frames apart. Remove

starting the engine. Electricity is stored in the 12 volt

screws (12) and disconnect terminals (13) from stator

battery. Charging for the battery is supplied by a belt

(29). Move end frames (11 and 14) apart to disclose

driven alternator, mounted on the right side of the

rotor (15). Place tape over the slip ring end on rotor (15)

engine, below the thermostat housing. The alternator is

and over the shaft to protect them from dirt and

directly connected to the ignition coil, through a resistor,

damage.

and to the ammeter. The connection to the battery is

(5) Place rotor (15) in a vise with

through the starter solenoid terminal. Refer to TM 10-

protected jaws and tighten only enough to hold rotor in

3930-630-12 for a wiring diagram of the electrical

place. Remove drive end frame (14) from rotor (15).

system.

b. A solid state voltage regulator is mounted

inside the alternator. The regulator never requires

4.3

Alternator, Cleaning, Inspection and Repair

adjustment and no provision for adjustment is provided.

a. Cleaning. Clean all metal parts with a

suitable dry cleaning solvent, and dry thoroughly with

compressed air. Remove all dirt, dust and foreign matter

4-2.

Alternator, Removal, and Disassembly

from the frames and fields with compressed air.

a. Removal. Refer to TM 10-3930-630-12

b. Rotor Test.

and remove the alternator.

(1) Check field winding for shorts.

b. Disassembly. Disassemble the alternator

Connect an ohmmeter as shown in figure 4-2 to the rotor

into major subassemblies for testing as follows:

slip rings.

(1) Remove nut (1, fig. 4-1) and waster

(2) If ohmmeter shows an infinite reading,

(2) and, using a suitable puller, remove pulley (3) from

slip rings and/or rotor coil is open. Replace rotor.

the alternator shaft.

(2) Remove nuts (4 and 5) and washers

(6, 7, and 8) from terminal stud (9).

4-1