HOSE 3858502 - 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 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 rod in the stick cylinder.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. Shut off the engine, and put the hydraulic activation control lever in the "Lock" position.e. Move the control levers for the boom, bucket, stick and swing through their full travel strokes. This will relieve any pressure that may be present in the pilot system.f. Slowly loosen the air breather cap on the hydraulic oil tank to release the pressure.g. Tighten the air breather cap on the hydraulic oil tank.h. The pressure in the hydraulic system has now been released. Lines and components can now be removed.2. Open the right rear access door. 3. Disconnect wiring harness (4). Disconnect hose assembly (1) from the travel speed solenoid valve. Put a plug in the hose assembly to prevent oil loss and to keep dirt and debris out of the hydraulic system.4. Remove two socket head bolts (3) that hold travel speed solenoid valve (2) to the pilot manifold. Remove the travel speed solenoid valve. Remove the two O-ring seals from the body of the valve. Install the travel speed solenoid valve in the reverse order of removal. Prior to installing the valve, check the condition of the two O-ring seals used in the valve body. If the seals are damaged, use new parts for replacement. Tighten the two socket head bolts that hold the travel speed solenoid valve