320 GX and 323 GX Excavator Systems Solenoid Valve (Hydraulic Lockout) Caterpillar


Solenoid Valve (Hydraulic Lockout)
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320 GX and 323 GX Excavator Systems [M0120170]
HYDRAULIC SYSTEM
VALVE GP-SOLENOID
320 GX and 323 GX Excavator Systems Solenoid Valve (Hydraulic Lockout)
1.1. References


Illustration 1g06573021
Main control valve
(1) Solenoid manifold
(2) Hydraulic lock solenoid valve


Illustration 2g06606683
Cab
(3) Hydraulic activation control lever (LOCKED position)


Illustration 3g06606752
(3) Hydraulic activation control lever
(4) Limit switch lever
(5) Bar
(6) Limit switch

Limit switch (6) and lever (4) are on a bracket with hydraulic activation control lever (3). The limit switch is activated by hydraulic activation control lever (3).

When hydraulic activation control lever (3) is shifted to the LOCKED position, solenoid valve (2) of oil manifold (1) is not energized. Pilot oil is not supplied to the pilot control valves. Thus when the joysticks and/or the travel levers/pedals are operated, the cylinders or the motors are not activated.

The engine will not start unless hydraulic activation control lever (3) is in the LOCKED position. If some one unexpectedly operates the machine, the machine will not operate.

When hydraulic activation control lever (3) is placed in the UNLOCKED position, solenoid valve (2) is energized and pilot oil passes through the solenoid valve. Pilot oil now flows to the pilot control valves.



Illustration 4g06199316
Partial diagram of solenoid valve (hydraulic activation) (UNLOCKED circuit)
(2) Hydraulic lock solenoid valve
(7) Passage (pilot oil to valve)
(8) Passage (pilot oil flow to pilot valves)
(9) Passage (return oil)

When hydraulic activation control lever (3) is placed in the UNLOCKED position, plunger (4) of limit switch (6) is depressed by control lever (3). Limit switch (6) is in the ON state.

When hydraulic activation control lever (3) is in the UNLOCKED position, solenoid (2) controls the hydraulic lock valve. When solenoid (2) is energized, the spool moves. Passages (7) and passages (8) open. Pilot pressure oil from passage (7) flows through passage (8). Pilot oil is now delivered through passage (8) to the pilot control valves.

When hydraulic activation control lever (3) is moved to the LOCKED position, plunger (4) of limit switch (6) is not depressed by control lever (3). Limit switch (6) is in the OFF state.

When hydraulic activation control lever (3) is in the LOCKED position, solenoid (2) is not energized. Passage (9) opens and passage (7) closes. Passage (7) is not open to passage (8). Pilot oil supply to passage (8) is stopped. Pilot oil supply to the pilot control valves is blocked. The cylinders and the motors cannot be activated.

References



Illustration 5g06471531

Reference: For more information, refer to supplemental video "320, 320 GC, 323, 325, 326, 326 GC, 330, 330 GC, 336, 336 GC and 340 Excavator Solenoid Valve (Hydraulic Lockout) System Operation" on AVSpare Channel1 (A CWS login is required to access AVSpare Channel1).

Note: Click or copy the following link into a web browser. (A CWS login is required to access AVSpare Channel1) or scan the following QR code using a QR enabled device.

https://channel1.mediaspace.kaltura.com/media/t/1_orgzphgc


Illustration 6g06541371

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