VALVE 3236851 - Caterpillar

At operating temperature, the hydraulic oil tank is hot and under pressure. Hot oil can cause burns. To prevent possible personal injury, release the pressure in the hydraulic system before and hydraulic lines or components are disconnected or removed.
Release the pressure in the hydraulic system as follows:a. shut off the engine.b. Move the control levers through their full travel strokes. This will relieve any pressure that may be present in the pilot system.c. Slowly loosen the air breather cap on the hydraulic oil tank to release the pressure.d. Tighten the air breather cap on the hydraulic oil tank.e. The pressure in the hydraulic system has now been released. Lines and components can now be removed.1. Drain the hydraulic tank to a level below the bottom of the hydraulic oil cooler. 2. Secure grill with straps and hoist. Remove bolts and washers (1) and remove grill (2). 3. Remove bolts and washers (3), secure with straps and hoist and remove cover (4). 4. Remove bolts and washers (5) and disconnect hydraulic line (6) on top of oil cooler. 5. Remove bolts (7) and disconnect hydraulic line on bottom. Remove bolts (8). Radiator is raised for photo purposes. 6. Secure oil cooler with hoist and strap. Remove bolts (9) and large washer and remove small oil cooler (10). Repeat for larger oil cooler. Install in the reverse order. Fill hydraulic tank to the correct level. See the Operation & Maintenance Manual.