GEAR GP-TRANSFER 8P7902 - Caterpillar

Sudden movement of the machine or the release of oil under pressure can cause personal injury. At operating temperature, the hydraulic oil is hot and under pressure. Hot oil can cause burns. To prevent possible personal injury, release the pressure in all of the implement circuits before any hydraulic lines or components are disconnected or removed.
1. Release the pressure in the hydraulic system as follows:a. Move the machine to a smooth horizontal location. Move away from working machines and personnel.b. Permit only one operator on the machine. Keep all other personnel either away from the machine or in view of the operator.c. Move the switch for the CUSHION-HITCH to the "LOCKDOWN" position. Be sure the rear bracket assembly of the hitch is down against (resting on) the front hitch assembly.d. Activate the parking and secondary brakes. Lower the bowl to the ground. Lower the apron. Stop the engine.e. Move all scraper control levers to all positions to release the pressure in the hydraulic system.f. Carefully loosen the fill cap on the hydraulic oil tank to release the pressure in the tank.g. Be sure all hydraulic pressure is released before any fittings, hoses or components are loosened, tightened, removed or adjusted. Wait at least five minutes after the machine is turned off. 2. Remove eight bolts (1) that hold grill assembly (2) in position. Remove the grill assembly. 3. Disconnect hose assemblies (3) and (4). Put plugs in the hose assemblies to prevent oil loss and to keep dirt out of the hydraulic system. 4. Remove two bolts (5) and the washers from each side of the hydraulic oil cooler. 5. Remove hydraulic oil cooler (6) from the machine. The following steps are for the installation of the hydraulic oil cooler.6. Check the condition of the hydraulic oil cooler prior to installation. Remove any dirt or debris that may restrict the flow of air through the core. Straighten any cooling fins that may be bent.7. Install the hydraulic oil cooler in the reverse order of removal.8. Check the oil level in the hydraulic oil tank. If necessary, fill the hydraulic oil tank with oil to the correct level. For the correct filling procedure, see the Operation & Maintenance Manual for 623F Elevating Wheel Tractor-Scrapers, SEBU6720.