CHAPTER 6 REPAIR OF COOLING SYSTEM

TM 10-3930-630-34

CHAPTER 6

REPAIR OF COOLING SYSTEM

Section I. DESCRIPTION

A gear in the fan drive adapter, driven by the camshaft

6-1. General

gear, drives a1 pulley. The belts are driven by the

pulley and, in turn, drive the fan and alternator pulleys.

The cooling system for the lift truck engine consists of a

A tank, mounted below, which is an integral part of the

water pump, a fan drive adapter, cooling fan, drive belt

radiator, cools the transmission oil. Capacity of the

radiator, thermostat and connecting hoses.

system is 9 quarts (9.45 liters) of coolant.

6-2. Cooling System Operation

Section II. RADIATOR

(b) Clamp the flushing gun (fig. 6-1) in the upper

6-3. Description

hose.

The radiator stores coolant and provides cooling

jacket with water.

surfaces for the fan driven air to pass over and lower the

(d) Apply air pressure at 6 psi (0.42 kg/m2)

temperature of the coolant. It is mounted at the rear of

the truck in a cutout in the counterweight. A grille is

maximum and blow out water.

provided to protect the radiator.

(e) Shut off air, fill jacket with water again and

apply air pressure. Repeat until flushing stream runs out

clear.

6-4. Radiator, Removal and Disassembly

(f) Disconnect flushing gun. Connect hose to

radiator and install thermostat (TM 10-3930-630-12).

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

Disassembly.

Disassemble the radiator

removal of the radiator.

assembly in numerical sequence as illustrated in figure

b.. Cooling System Fish.

6-2.

(1) Radiator

6-5. Radiator, Cleaning, Inspection and Repair

NOTE

It is not necessary to remove the

a. Flush transmission oil cooler tank (bottom part of

radiator to perform reverse flushing.

radiator) with cleaning solvent and blow out with

Disconnect the upper and lower

compresses air.

radiator hoses and proceed as

b. Brace all fractures and breaks for proper sealing.

follows.

If damage is severe, replace the radiator assembly.

c. To clean cooling fins direct a blast of' dry air

(a) Check to be certain radiator cap is tight.

against the real of the radiator core to dislodge dust

(b) Clamp ) flushing gun (fig. 6-1) in the lower hose

which may accumulate due to dusty operating

with a hose clamp.

conditions.

(c) Turn on the water and fill the radiator.

d. Clean the cooling system to remove lime, scale,

(d) Apply 4iir pressure at 6 psi (0.42 kg/m2)

and other foreign deposits from the cooling system.

maximum gradually, to avoid radiator damage.

e. Refer to TM 10-3930-630-12 and inspect all

(e) Shut off air, fill radiator with water again and

hoses and fittings for signs of deterioration, and replace

apply air pressure. Repeat until the flushing stream runs

if necessary.

out clear.

6-6. Radiator, Reassembly and Installation

(f) Clean and inspect radiator cap. Replace if

a. Reassembly. Reassemble the radiator in the

damage is noted. Radiator cap must maintain 7 psi in

reverse of numerical sequence as illustrated in figure 6-

system.

(2) Water Jacket.

b.. Installation. Refer to TM 10-3930-630-12 and

(a) Refer to TM 10-3930-630-12 and remove the

install the radiator.

thermostat and disconnect upper hose and lower hoses

from radiator.

6-1