CAP-RADIATOR 2668550 - 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 any 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. Support Grapple head with blocks as shown. 2. Remove bolts (1) and cover (2). 3. Disconnect four lines (3). 4. Remove cotter pin (5), nut (6), pin (4), friction disc "hidden", retainer (7), plate (8), friction disc "hidden", retainer (9), spring disc "hidden". Use machine hydraulics to separate arch and cross head from grapple head. Install in the reverse order. Fill the hydraulic oil tank with oil to the correct level. See the Operation & Maintenance Manual for the correct filling procedure.