ABSORBER AS-SHOCK 1544812 - Caterpillar

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Pilot oil manifold (1) Pilot oil manifold (2) Solenoid valve (hydraulic activation)
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Cab (3) Hydraulic activation control lever (LOCKED position)
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Cab (3) Hydraulic activation control lever (UNLOCKED position)
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(3) Hydraulic activation control lever (4) Limit switch (5) Plunger (6) Box
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Cab (bottom view) (6) Box Limit switch (4) and plunger (5) are contained in box (6). 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 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.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.
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Partial diagram of solenoid valve (hydraulic activation) (UNLOCKED circuit) (2) Solenoid valve (hydraulic activation) (7) Solenoid (8) Spring (9) Spool (10) Control valve (11) Passage (12) Passage (13) Passage (14) Passage (oil flow to hydraulic tank) (15) Line (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) PassageWhen 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 solenoid valve (hydraulic activation) (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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Partial drawing of solenoid valve (hydraulic activation) (LOCKED position) (1) Solenoid valve (hydraulic activation) (7) Solenoid (8) Spring (9) Spool (11) Passage (12) Passage (13) Passage (14) Passage (oil flow to hydraulic tank) (20) PassageWhen 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