CASE & FRAME GP 1141796 - Caterpillar

The Control Switch is in the OFF position
Illustration 1 g01078105
(1) Piston motor (2) Control valve (3) Solenoid (4) Variable orifice (5) Load sensing line (6) Variable spring (7) Load sensing valve (8) Inlet passage (9) Variable spring (10) Pressure compensator valve (11) Piston pump (12) Orifice (13) Suction line from hydraulic tank (14) Swashplate pistonWhen the engine is initially started, piston pump (11) draws oil through suction line from the hydraulic tank (13). Oil flows to load sensing valve (7), pressure compensator valve (10), and control valve (2) .Control valve (2) has an on/off solenoid (3). When the solenoid switch is in the OFF position, the control valve (2) is closed. Oil flows to inlet passage (8). When the force of the oil pressure in inlet passage (8) becomes higher than the force of variable spring (6), the spool assembly in load sensing valve (7) moves to the right. This allows oil flow through pressure compensator valve (10). Oil from pressure compensator valve (10) flows to the head end of swashplate piston (14) and oil also flows to orifice (12). Oil from orifice (12) flows back into the hydraulic tank. The pressure setting for variable spring (6) is 1400 kPa (203 psi). An increase or a decrease in the force that is applied by variable spring (6) changes the pressure setting of load sensing valve (7) .If oil pressure in inlet passage (8) becomes higher than the force of variable spring (9), the spool assembly in pressure compensator valve