Thermostat - TM-10-3930-632-120081

TM 10-3930-632-12

(1) Drain the cooling system.

(2) If the condition of the radiator is

(2) Loosen the clamp and disconnect the

uncertain, test it for leaks as follows:

upper hose from the thermostat housing. Remove the

(a) Plug all outlets except the top

bypass hose from the elbow on the thermostat housing;

outlet. Immerse the radiator in water and apply low

remove the elbow and thermostat (fig. 4-36).

pressure air (10 PSIG maximum) through the top outlet.

b. Inspection and Testing.

(b) Carefully check for air bubbles

which indicate a leak.

(1) Inspect the thermostat and thermostat

NOTE

housing for cracks, distortion, scale or dirt deposits, or

other physical damage.

Make sure the radiator is empty of water

(2) Suspend the thermostat in a pan of

before performing an air check. Water in

water on a stove. Place a thermometer capable of

radiator may prevent the air from being

reading temperatures up to the boiling point in the pan.

ejected through a leaking area.

Heat the water. The thermostat must open between

d. Installation.

150to 185 F.

(3) Replace the gasket and, if defective,

(1) Install the radiator as shown in figure 4-

replace the thermostat.

36.

c. Installation.

(2) Close the drain cock at the bottom of

(1) Install the thermostat housing as shown

the radiator and fill the radiator in accordance with

in figure 4-36.

current directives. Use antifreeze, if necessary (table 3-

(2) Install the upper hose and the bypass

2), or use water containing a rust inhibitor.

hose.

(3)

Run the engine until it reaches

operating temperature and check for leaks. Operate the

4-55. Fan and Alternator Belts

fork lift truck in forward and reverse directions and

a. Adjustment. The fan and alternator belts

check the transmission oil level. Add oil if necessary.

(4) Install the overhead guard and radiator

must be tightened so that they can be deflected between

cover.

3/4 and 1 inch at a point midway between the crankshaft

pulley and the fan drive pulley. If necessary, adjust the

4-54. Thermostat

belts as shown in figure 4-39.

a. Removal.

4-53