Radiator Pressure Cap - Clean/Replace
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At operating temperature, the engine coolant is hot and under pressure. Steam can cause personal injury. Check the coolant level only after the engine has been stopped and the fill cap is cool enough to touch with your bare hand. Remove the fill cap slowly to relieve pressure. Cooling system conditioner contains alkali. Avoid contact with the skin and eyes to prevent personal injury. |
The radiator on this machine has a top tank on the front right side of the machine. The radiator cap is located above the top tank and is the filler cap.
- Open right engine compartment door (1).
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Illustration 2 g03710139 - Slowly remove radiator cap (2) in order to relieve system pressure.
- Inspect the radiator cap for damage, for deposits, or for foreign material. Clean the radiator cap with a clean cloth. Replace the radiator cap if the radiator cap is damaged.
- Install the radiator cap.
- Close the right engine compartment door.
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| Illustration 1 | g03710133 |
Cooling System Water Temperature Regulator - Replace
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Personal injury can result from hot coolant, steam and alkali. At operating temperature, engine coolant is hot and under pressure. The radiator and all lines to heaters or the engine contain hot coolant or steam. Any contact can cause severe burns. Remove filler cap slowly to relieve pressure only when engine is stopped and radiator cap is cool enough to touch with your bare hand. Do not attempt to tighten hose connections when the coolant is hot, the hose can come off causing burns. Cooling System Conditioner contains alkali. Avoid contact with skin and eyes. |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products. Dispose of all fluids according to local regulations and mandates. |
Replace the thermostat on a regular basis in order to reduce the chance of unscheduled downtime and of problems with the cooling system.
A new thermostat should be installed after the cooling system has been cleaned. Install the thermostat while the cooling system is drained. You may install the thermostat while the cooling system coolant is drained to a level that is below the thermostat housing.
Note: If you are only installing a new thermostat, drain the cooling system coolant to a level that is below the thermostat housing.
- Loosen the hose clamp and remove the hose from the elbow. Disconnect the hose assembly from the thermostat housing assembly.
- Remove the bolts from the elbow. Remove the elbow.
- Remove the gaskets, the thermostat, and the thermostat housing.
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NOTICE Never operate an engine without water temperature regulators in the cooling system. Water temperature regulators help to maintain the engine coolant at the proper operating temperature. Cooling system problems can develop without water temperature regulators.
Show/hide tableNOTICE If the thermostat is installed incorrectly, it will cause the engine to overheat.
- Install the new thermostat and the new gasket. Install the thermostat housing on the engine cylinder head.
- Install the elbow and the hose. Tighten the hose clamp.
- Replace the coolant that was drained from the system. Refer to Operation and Maintenance Manual, "Capacities (Refill)".
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| Illustration 3 | g03706528 |
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Right side view | |