CIRCUIT 3534712 - Caterpillar

Illustration 2 g01261945
Anti-reaction valve (neutral position)
(1) Block
(3) Anti-reaction valve
(4) Anti-reaction valve
(5) Fine swing solenoid valve (if equipped)
(6) Passage
(7) Port
(8) Passage
(9) Passage
(10) Passage
(11) Port
(12) Passage
(13) Spring
(14) Valve seat
(15) Passage
(16) Plunger
(17) Passage
(18) Spring
(19) Piston chamber
(20) Passage
(21) Spring chamber
(22) Spring
(23) Valve seat
(24) Plunger
(25) Spring
(26) Piston
(31) Passage
(36) Motor rotary group During a swing operation of the upper structure, the oil delivery from the idler pump flows through passage (8) or passage (10) in block (1) to motor rotary group (36). When the swing joystick is in the NEUTRAL position, the swing control valve is in the NEUTRAL position. The oil delivery from the idler pump is blocked at the swing control valve. No oil delivery flows to the motor rotary group. The return oil from the swing motor is also blocked at the swing control valve.Plunger (24) in anti-reaction valve (3) shifts downward by the force of spring (25) until the plunger is stopped by piston (26). Valve seat (23) shifts downward by the force of spring (22) until the valve seat comes in contact with plunger (24). Plunger (16) and valve seat (14) in anti-reaction valve (4) are shifted downward in the same manner as anti-reaction valve (3).
Illustration 3 g01261950
Anti-reaction valve (swing operation)
(1) Block
(3) Anti-reaction valve
(4) Anti-reaction valve
(5) Fine swing solenoid valve (if equipped)
(6) Passage
(7) Port
(8) Passage
(9) Passage
(10) Passage
(11) Port
(12) Passage
(13) Spring
(14) Valve seat
(15) Passage
(16) Plunger
(17) Passage
(18) Spring
(19) Piston chamber
(20) Passage
(21) Spring chamber
(22) Spring
(23) Valve seat
(24) Plunger
(25) Spring
(26) Piston
(31) Passage
(34) Spring chamber
(36) Motor rotary group When the swing joystick is moved from the NEUTRAL position in order to perform a swing operation, the swing control valve shifts. The oil delivery from the idler pump flows through the swing control valve and port (11) in block (1). The oil delivery then flows through passage (10), passage (12) and motor rotary group (36). Return oil from the motor rotary group flows through passage (6), passage (8), port (7) and the swing control valve to the hydraulic tank. The motor rotary group rotates.A portion of the pressure oil from the idler pump at port (11) also flows to anti-reaction valves (3) and (4).At anti-reaction valve (3), pressure oil from the idler pump and the force of spring (22) shifts valve seat (23) downward against plunger (24). Plunger (24) shifts downward against piston (26).Pressure oil from the idler pump also flows through passage (9). The pressure oil enters spring chamber (34) of anti-reaction valve (4). Plunger (16) shifts upward against the force of spring (18). Valve seat (14) is moved upward against the force of spring (13) by plunger (16).
Illustration 4 g01261963
Anti-reaction valve (swing stop)
(3) Anti-reaction valve
(4) Anti-reaction valve
(5) Fine swing solenoid valve (if equipped)
(7) Port
(8) Passage
(9) Passage
(10) Passage
(11) Port
(13) Spring
(14) Valve seat
(15) Passage
(16) Plunger
(17) Passage
(18) Spring
(19) Piston chamber
(20) Passage
(21) Spring chamber
(22) Spring
(23) Valve seat
(24) Plunger
(25) Spring
(27) Orifice
(26) Piston
(28) Valve chamber
(29) Passage
(30) Ball
(31) Passage
(32) Orifice
(33) Ball
(35) Valve chamber
(36) Motor rotary group When the swing joystick is returned to the NEUTRAL position, the oil delivery from the idler pump to motor rotary group (36) is blocked at the swing