WRENCH 5P1663 - Caterpillar

Do not remove any valve, hydraulic fitting or valve core, nor disassemble any parts until pressure has been released. Failure to release pressure can cause personal injury or death.
The following steps are to release the pressure in the system:a. Shut off engine.b. With operator in seat and bucket on ground, engage selector valve (pilot control) and actuate an implement control lever about ten times to release pressure in hydraulic system.c. Press the relief valve button on the hydraulic tank breather to release the tank pressure.
Hydraulic oil that is under pressure and hot can cause bodily injury. Move the control levers to relieve pressure in the hydraulic system. Let the hydraulic oil become cool before any lines are disconnected in the hydraulic system.
Located on the cab riser1. Disconnect pilot pressure sensor wiring harness (1) at the electrical connection. Remove bolt (2), the washer, and the clips that hold electronic control assembly (3) to the panel assembly.
Located on the manifold & relief valve (pilot)2. Remove pilot pressure sensor (4) and the O-ring from elbow (5). The following steps are for the installation of the sensor (pilot pressure). Check all components for wear or damage and replace if necessary. Apply 1U-6396 O-ring Compound to all O-ring seals prior to installation, if applicable.3. Install pilot pressure sensor (4) and the O-ring to elbow (5)4. Put electronic control assembly (3) in position on the cab riser. Install bolt (2), the washer, and the clips. Connect pilot pressure sensor wiring harness (1) at the electrical connection.