Fan and Fan Belt

3-39. Fan and Fan Belt

a. Inspection. Inspect belt for wear. fraying or

deterioration. Check for belt deflection and adjust

(para 3-12), if necessary.

b. Fan Belt Removal and Inspection.

(1) Loosen alternator adjusting strap (fig. 3-5)

to loosen fan belt and slip belt from alternator pulley.

(2) Remove radiator grille and panel (para 3-37).

(3) Refer to figure 3-24 and remove hydraulic

pump as follows:

(4) Disconnect three hydraulic lines from hy-

draulic pump.

(5) Remove four screws and lock washers secur-

ing hydraulic pump plate to engine. Remove pump

plate, with pump attached, from engine.

(6) Slip fan belt (18, fig. 3-23) from crankshaft

pulley and work belt up and over fan blades and off

fan pulley.

(7) Install new belt by slipping over fan blades

and around crankshaft pulley and fan pulley.

(8) Refer to figure 3-24 and install hydraulic

Figure 3-24. Hydraulic pump, installed view.

pump and plate and secure with four screws and

(21) securing fan to fan hub on water pump.

lock washers. Connect hydraulic lines to pump. In-

(3) Remove fan (19) and fan pulley (22) from

stall radiator grille (para 3-37).

engine.

(9) Slip fan belt over alternator pulley and refer

(4) Install engine fan as follows:

to paragraph 3-12 and adjust fan belt tension and

(5) Install fan pulley and fan on fan hub, with

secure alternator.

c. Engine Fan Removal and Installation. Refer to

fan pulley engaging fan belt.

figure 3-23 and remove engine fan as follows:

(6) Secure fan and pulley to hub with four screws

(20) and lock washers (21). Tighten screws securely.

(1) Refer to paragraph 3-37 and remove radiator

(7) Refer to paragraph 3-37 and install radiator

grille and radiator.

and radiator grille.

(2) Remove four screws (20) and lock washers

Section XII. ELECTRICAL SYSTEM

e. The indicator circuit, horn circuit, and lighting

3-40. General

circuits are protected by fuses. Two fuses are mount-

ed on a panel beneath the instruments. The other

a. Refer to figure 1-3 for a schematic diagram of

fuses are in holders directly in the lines.

the electrical system.

f. The starting circuit consists of a starter button,

b. The main components of the engine electrical

solenoid relay and engine starter.

system are the battery, alternator, voltage regulator,

g. The battery is a 12 volt, negative ground, long

ignition coil, distributor and spark plugs.

type, mounted in a battery box below the operator's

c. Parts of the engine electrical system that power

seat. The voltage regulator is mounted on the side of

indicators and other instruments are the coolant

the battery box.

temperature transmitter, engine oil pressure trans-

Caution: Before attempting removal of any

mitter, and a pressure snitch in the hourmeter

electrical component, disconnect the battery

circuit.

ground wire.

d. Lights on the truck consist of a front headlight

and a stop and taillight. A pressure switch on the

3-41. Alternator

brake master cylinder powers the stop light. The

a. Output test. Connect the alternator in a test

light switch on the instrument panel actuates the

circuit as shown in figure 3-25.

lights.

3-26