BUSHING 1F3559 - Caterpillar

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 the implement hydraulic circuits (boom, stick and bucket) before any hydraulic lines or components are disconnected or removed.
1. Release the pressure in the hydraulic system as follows:a. Fully retract the stick cylinder rod.b. Adjust the position of the bucket so it will be flat on the ground when the boom is lowered.c. Lower the boom until the bucket is flat on the ground.d. Stop the engine.e. Place the engine start switch in the "ON" position without starting the engine.f. Move the control levers for the boom, stick, bucket and swing to all full stroke positions. This will release any pressure that might be present in the pilot system.g. Slowly move the travel pilot control pedal to "FORWARD" and "REVERSE" travel positions. This will release any pressure in the travel circuit.h. Slowly loosen and remove the pressure cap on the hydraulic tank to release the hydraulic pressure.i. Reinstall and tighten the pressure cap on the hydraulic tank.j. The pressure in the hydraulic system has been released and implement/travel lines and components can be removed. 2. For installation purposes, put identification marks on three hose assemblies (1) as to their location on pilot manifold (2). Disconnect the three hose assemblies from the pilot manifold. Put plugs in the ends of the hose assemblies to prevent loss of oil and to keep contaminants out of the hydraulic system. 3. Remove low flow pressure relief valve (3) from pilot manifold (2). Remove the two O-ring seals from the low flow pressure relief valve. The following steps are for the installation of the low flow pressure relief valve.4. Check the condition of the O-ring seals used on the low flow pressure relief valve. If any of the seals are damaged, use new parts for replacement.5. Install the low flow pressure relief valve in the reverse order of removal.6. Check the oil level of the hydraulic oil tank. Fill the hydraulic oil tank with oil to the correct level. Refer to the Operation & Maintenance Manual for the correct filling procedure.