24. SERVICE PROCEDURE 24.1.11 THERMOSTATS REMOVAL 1. Drain the cooling system. Refer to “DRAINING THE SYSTEM” in this section. 2. Remove the radiator hose from the termostat housing and remove the four mounting capscrews. 3. Remove the thermostat and o-rings and clean all gasket material from either mating surfaces. 4. Visually inspect the thermostat sel for cracks, corrosion or other damage. If the seal is damaged, it must be replaced. NOTE: Use care when removing the thermostat seal so as not to damage the housing. Use a punch and hammer to remove the seal from the housing. Inspect the housing for cracks or damage. 5.
Make sure the thermostat housing is clean before installing the new seals. NOTE: When installing the new seal, the flat side of the seal must be facing the mandrel. Use thermostat seal mandrel, Part No. CUST-1225, and a hammer to install the new seal. INSTALLATION 1. Install new thermostat with new o-ring. 2. Re-install thermostat housing and all component parts. 3. Fill the cooling system. Refer to “COOLING THE SYSTEM” in this section. Check the fan for cracks, loose rivets (for metal fans) and bent or loose blades. Make sure it is securely mounted. Tighten the capscrews if loose. Replace damaged fans.
24.1.13 CHECK AND TIGHTEN TRACK SHOE BOLTS If the machine is used with track shoe bolts a loose, they will break, so tighten any loose bolts immediately. Method for tightening 1. Tighten first to a tightening torque of 390 ± 40 Nm (40 ± 4 kgm, 290 ± 30Ib ft) , then check that the nut and shoe are in close contact with the link mating surface. 2. After checking, tighten a further 120 o ± 10 o . Order for tightening Tighten the bolts in the order shown in the diagram. After tightening, check that the nut and shoe are in close contact with the link mating sur- face. PC450-ENG 3-32 WARNING Personal injury can result from a fan blade failure. Never pull or pry on the fan.
This can damage the fan blade(s) and cause fan failure. WARNING