HOSE 3817234 - 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. Put identification marks on the two wiring harnesses that are connected to components on the pilot manifold. Disconnect two wiring harnesses (3).4. Put identification marks on 13 hose assemblies (1) that are connected to the pilot manifold. Disconnect 13 hose assemblies (1). Put plugs in the ends of the hose assemblies to prevent oil loss and to keep dirt and debris out of the hydraulic system.5. Remove the three bolts that hold the pilot manifold in position. Remove pilot manifold (2). The following steps are for the installation of the pilot manifold.6. Put pilot manifold (2) in position, and install the three bolts which hold it.7. Check the condition of the O-ring seals used in the ends of 13 hose assemblies (1). If any of the seals are damaged, use new parts for replacement.8. Connect 13 hose assemblies (1) in their original locations on the pilot manifold.9. Connect two wiring harnesses (3) in their original locations on the pilot manifold.10. Check the oil level in the hydraulic oil tank. Fill the hydraulic oil tank to the correct level. Refer to the 350 & 350 L Excavators Operation & Maintenance Manual for the correct filling procedure.