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| Illustration 1 | g00786716 |
Pilot oil manifold (1) Pilot oil manifold (2) Hydraulic activation solenoid valve | |
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| Illustration 2 | g00681576 |
Cab (3) Hydraulic activation control lever (LOCKED position) | |
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| Illustration 3 | g00681580 |
Cab (3) Hydraulic activation control lever (UNLOCKED position) | |
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| Illustration 4 | g00763773 |
(3) Hydraulic activation control lever (4) Limit switch (5) Plunger (6) Box | |
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| Illustration 5 | g00786717 |
Cab (bottom view) (6) Box | |
When hydraulic activation control lever (3) is placed in the LOCKED position, solenoid valve (2) of pilot 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.
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| Illustration 6 | g00747088 |
Partial diagram of solenoid valve (hydraulic activation) (UNLOCKED circuit) (2) Hydraulic activation solenoid valve (7) Solenoid (8) Spring (9) Spool (10) Control valve (11) Passage (12) Passage (13) Passage (14) Passage (return oil) (15) Passage (pilot oil to swing parking brake solenoid valve) (16) Swing parking brake solenoid valve (17) Pilot oil flow to pilot valves (joysticks) (18) Valve (hydraulic activation) (19) Passage | |
When hydraulic activation control lever (3) is placed in the UNLOCKED position, plunger (5) of limit switch (4) is depressed by control lever (3). Limit switch (4) is in the ON state.
The hydraulic activation solenoid valve (2) consists of solenoid (7) and control valve (10). When hydraulic activation control lever (3) is in the UNLOCKED position, solenoid (7) controls valve (10). When solenoid (7) is energized, spool (9) moves in a downward direction against the force of spring (8). Passage (12) opens. Pilot pressure oil from passage (13) flows through passage (11) to valve (18). The spool in valve (18) moves in a downward direction. Pilot pressure oil in passage (19) flows through valve (18). Pilot oil is now delivered through passage (15) to swing parking brake solenoid valve (16). Pilot pressure oil in passage (19) is also delivered to the pilot control valves (joysticks and travel levers/pedals) through line (17).
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| Illustration 7 | g00747089 |
Partial drawing of solenoid valve (hydraulic activation) (LOCKED position) (1) Hydraulic activation solenoid valve (7) Solenoid (8) Spring (9) Spool (11) Passage (12) Passage (13) Passage (14) Passage (return oil) (20) Passage | |
When hydraulic activation control lever (3) is moved to the LOCKED position, plunger (5) of limit switch (4) is not depressed by control lever (3). Limit switch (4) is in the OFF state.
When hydraulic activation control lever (3) is in the LOCKED position, solenoid (7) is not energized. Spool (9) is forced upward by spring (8). Passage (20) opens and passage (12) closes. Passage (13) is not open to passage (11). Pilot oil supply to line (17) is stopped. Pilot oil supply to the pilot control valves (joysticks and travel levers/pedals) is blocked. The cylinders and the motors can not be activated.