ENGINE AR 2724677 - 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. Disconnect wire assembly (1).3. Disconnect oil line (2) from differential lock actuator valve (4). Plug the fittings on oil line (2) in order to prevent the loss of oil, and in order to keep dirt out of the oil system.4. Remove bolts and washers (3) and differential lock actuator (4) from the differential. 5. Remove O-ring seals (5) from differential lock actuator valve (4). The following steps are for the installation of the differential lock actuator valve.6. During the installation of the differential lock actuator valve, check the condition of all the O-ring seals used. If the seals are damaged, use new parts for replacement.7. Install O-ring seals (5) to differential lock actuator valve (4)8. Position differential lock actuator valve (4) and install bolts and washers (3).9. Connect oil line (2) to differential lock actuator valve (4).10. Connect wiring harness (1).Disassemble & Assemble Differential Lock Actuator Valve
Start By:a. remove differential lock actuator valve 1. Remove nut (5) and the washer that hold coil assembly (4) to differential lock actuator valve (1).2. Remove coil assembly (4) from differential lock actuator valve (1).3. Remove cartridge (3) from differential lock actuator valve (1). Remove three O-ring seals (2) from cartridge (3). The following steps are for the assembly of the differential lock actuator valve.4. Make sure that all components of the differential lock actuator valve and the matching components are clean prior to installation. During the installation of the differential lock actuator valve, check the condition of all O-ring seals used. If any of the seals are damaged, use new parts for replacement. Cartridge Seal kit 6G-5979 contains three O-ring seals.5. Install three O-ring seals (2)