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| Illustration 1 | g01233476 |
The joystick controls the hook. The joystick is a dual axis pilot valve. When the joystick is moved forward the hook will lower. When the joystick is moved backward the hook will raise. When the joystick is moved to the FORWARD/LEFT position the quick drop function will be activated. The joystick cannot be moved to the right. The cartridge that would normally be activated by moving the joystick to the right has been replaced with a spacer.
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| Illustration 2 | g01233478 |
(1) Pin (2) Cross-Drilled Hole (3) Hook Raise (4) Hook Lower (5) Inlet Port From Pump (6) Quick Drop (7) Cartridge (8) Outlet Passage | |
Pilot supply oil enters the pilot valve through port (5). Cross-drilled holes (2) supply pilot oil to all of the cartridges in the valve.
The cartridge (7) controls the path which connects to the supply. The cartridge (7) also controls the path which connects to the tank.
When the operator activates the pilot control valve, the oil flows to the control valve through passage (5). If the valve is not activated the oil is drained from passages (3), (4) and (6) and returns to the tank through passage (8). A small flow of oil is constantly drained through an orifice in the warm-up circuit port in order to keep the valve responsive in cold weather. The control valve allows the oil to turn the winch motor clockwise or the control valve allows the oil to turn the winch motor counterclockwise.
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| Illustration 3 | g01236753 |
Section of the cartridge assembly (9) Plunger (10) Ball (11) Centering spring for the plunger (12) Control spring (13) Bias spring (14) Spool (15) Retainer | |
In the NEUTRAL position, the pilot supply oil is blocked by the spool (14). Oil from the end of the control spool in the control valve flows to the tank. The spool is held in this position by the control spring (12), bias spring (13), and the centering spring for the plunger (11) .
Move the pilot lever to the desired position. The pin (1) from the lever pushes down on the plunger (9). The plunger (9) pushes down on the retainer (15). The retainer (15) pushes on the control spring (12). The control spring (12) pushes on the spool (14). The bias spring (13) acts against the control spring (12). The springs determine the position of the spool. The spool closes the path from the control to the tank. The spool opens a path from the pilot supply oil to the control valve. As the cartridge nears the end of the stroke, the ball (10) is pushed by the plunger (9). The ball forces the spool downward. Now, the position of the spool is not regulated by the two springs. The position of the spool is controlled directly by the plunger. This causes the control pressure to rapidly rise to the supply pressure. The rapid rise in pressure is present in all cartridges.