BLOCK 7W3337 - Caterpillar

Illustration 1 g03814145
Water Spray System (OFF)
(1) Pump control valve
(2) Reverse combination valve
(3) Pressure switch
(4) To tank filter
(5) Water spray system pump
(6) Forward combination valve
(7) Charge relief valve
(8) Charge pump
(9) Water spray motor When the engine is operating, the input shaft of the water spray system pump (5) rotates. When the pump solenoids in pump control valve (1) are not energized, both sides of the pump servo piston are open to case drain. In this case, the servo piston moves the pump swashplate to the neutral position. Charge pressure acts against charge relief valve (7). When charge pressure is greater than the setting of the valve, the oil pressure overcomes the spring force, and the charge relief valve opens.Charge pressure also acts against the makeup valve in reverse combination valve (2) and forward combination valve (6). If