CONT GP -B 0R6777 - Caterpillar

Before the pressure control valve is removed from the machine, be sure that all of the pressure in the system has been released. Disconnect the pump line and pilot lines, and remove the valve assembly.
1. Remove cover (1) from valve body. Be careful when removing the cover, because there is spring force behind the cover. 2. Remove three springs (2), (3) and (4) from the bores in the valve body. 3. Remove valves (5) and (6). The larger valve will have shims in it. 4. Remove plug (7), spring (8) and ball check (9). There is another ball check valve in the cover. Remove it too. Keep the parts of the two ball checks separate. They must be installed in the same bore from which they were removed.Assemble Pressure Control Valve
1. Install the ball check valves, springs and plugs. Be sure to get the ball checks back in their respective bores. These groups are different and can not be mixed. 2. Put SAE 10 oil on valves (5) and (6). Install the valves in their repsective bores. Install shims in the larger valve. 3. Install the spring (2) in the bore for the small valve and springs (3) and (4) in the bore for the large valve. 4. Be sure that the seals are installed in cover (1) and install the cover with four bolts. It may be necessary to use longer bolts to get compression of the springs for assembly.