INSTALLER A- 5P7298 - Caterpillar

At operating temperature, the hydraulic oil is hot and under pressure. Hot oil can cause burns. Sudden movement of the machine or release of oil pressure can cause injury to persons on or near the machine. To prevent possible injury, perform the following procedure before working on the hydraulic and steering systems.
a. Move the machine to a smooth horizontal location. Move away from working machines and personnel. Lower all implements to the ground. Install the wheel lean pin in front axle.b. Permit only one operator on the machine. Keep all other personnel either away from the machine or in view of the operator.c. Activate the parking brake. Place all implements on the ground and put the blade in the "FLOAT" position.d. Stop the engine.e. Turn the steering wheel back and forth several times to relieve pressure in the steering accumulator.f. Carefully loosen the filler cap on the hydraulic tank to release pressure in the tank.g. Be sure all hydraulic pressure is released before any fitting, hose or component is loosened, tightened, removed or adjusted.h. Tighten the cap on the hydraulic tank.i. The pressure in the hydraulic system must be released before lines or components can be removed.
Hydraulic pressure can exist in the hydraulic lines between the control valves and the cylinders with the engine stopped. Manually relieve pressure before working on any hydraulic circuit.
2. Remove two bolts (1). Remove four bolts (2). Use two people to remove cover plate (3) from the machine frame. The weight of the cover plate is 14 Kg (31 lb). 3. Disconnect quick connect (4). Disconnect the fitting of hose (6) from hydraulic pump pressure sensor (5). Plug the fittings to prevent loss of oil, and to keep dirt out of the oil system. Remove two nuts and bolts (7) from sensor (5). Remove hydraulic pump pressure sensor (5) from mounting bracket (8).Install Hydraulic Pump Pressure Sensor
1. During installation of the hydraulic pump pressure sensor, check the condition of all O-ring seals used in the ends of hose assemblies that were disconnected. If any of the seals are damaged, use new parts for replacement.2. Position hydraulic pump pressure sensor (5) to mounting bracket (8). Install two nuts and bolts (7) in sensor (5). Connect hydraulic hose (6) to hydraulic pump pressure sensor (5). Reconnect electrical quick connect (4).3. Use two people to position cover plate (3) to the machine frame. Install four bolts (2). Install two bolts (1).