Lubrication & Maintenance/500 Hour/12 Month Checking Engine Electrical Ground Connections Keep all engine ground connections clean and tight to prevent electrical arcing which can damage electronic components. Also see precautions in Troubleshooting Section when welding on engine or machine. OUOD002,0000169 –19–23NOV01–1/1 Checking Cooling System CAUTION: Explosive release of fluids from pressurized cooling system can cause serious burns. Shut off engine. Only remove filler cap when cool enough to touch with bare hands. Slowly loosen cap to first stop to relieve pressure before removing completely. TS281 –UN–23AUG88 IMPORTANT: Air must be expelled from cooling system when system is refilled.
Loosen temperature sending unit fitting at rear of cylinder head or plug in thermostat housing to allow air to escape when filling system. Retighten fitting or plug when all the air has been expelled. High-Pressure Fluids 1. Visually check entire cooling system for leaks. Tighten all clamps securely. 2. Thoroughly inspect all cooling system hoses for hard, flimsy, or cracked condition. Replace hoses if any of the above conditions are found. 3. Inspect the coolant pump for wear or leakage. OURGP11,0000151 –19–06JAN04–1/1 30-16 021604 PN=153