112 Maintenance Section
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Cooling System Coolant Change
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.
Illustration 193
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3. Loosen drain valve (2) that is located at the bottom right corner of the radiator. Drain the coolant into a suitable container.
NOTICE 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, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.
Illustration 194
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Dispose of all fluids according to local regulations and mandates.
4. Remove coolant drain plug (3) that is located in the engine block above the starter. Drain the coolant into a suitable container.
If the coolant in the machine is changed to another type of coolant, consult your Caterpillar dealer.
Note: Check the threads of the drain plug for damage. Check the sealant on the drain plug for damage. The drain plug can be reused if threads are not damaged and the sealant is not damaged.
1. Allow the engine to cool.
Illustration 195 Illustration 192
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2. Loosen pressure cap (1) from the coolant tank slowly in order to release pressure. Remove the pressure cap.
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5. Loosen hose clamp (5) that is located on the hydraulic oil cooler. Remove hose (4). Allow the coolant to drain into a suitable container.
