For additional information on the hydraulic system, refer to Hydraulic Schematic, KENR6525.
HOLD Position
Note: Detailed oil flow is not shown for the HOLD position. Refer to Illustration 1 for references to components.
When the engine is running, the charge pump (not shown) sends pilot oil to pressure accumulator (19) through line (20). Pilot oil is available to the electrohydraulic pilot solenoids.
The valve spools in the HOLD position block the passages to the rod end and to the head end of the hydraulic cylinders. The oil is trapped and the implements do not move. In the HOLD position, the spring centers the valve spool.
Open Operation
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| Illustration 1 | g01929876 |
Open operation (11) Anti-drift valve (12) Multipurpose bucket control valve (13) Multipurpose bucket cylinders (14) Line relief valve (multipurpose bucket rod end) (15) Line relief valve (multipurpose bucket head end) (19) Accumulator (20) Flow from the charge circuit of the right drive pump (22) Margin relief valve (24) Pilot control solenoid (26) Implement pump (27) Hydraulic oil tank | |
When the multipurpose bucket control is moved to the OPEN position, the solenoids allow pilot oil to flow to the left end of multipurpose bucket valve spool (12). This causes the valve spool to move to the right.
The movement of multipurpose bucket valve spool (12) causes the load signal pressure to increase. The pressure at implement pump (26) increases. The oil from implement pump (26) now flows to the rod ends of multipurpose bucket cylinders (13). This causes the cylinder pistons and rods to retract. The movement of the cylinder pistons and rods pushes oil out of the head ends of the multipurpose bucket cylinders.
The oil from the head end flows into the valve bank. Then, the oil travels to hydraulic tank (27) .
There are no detents on the multipurpose bucket control. When the multipurpose bucket control is released, the control moves to the HOLD position. The spring moves multipurpose bucket valve spool (12) back to the HOLD position. The oil in the multipurpose bucket cylinders is blocked by the multipurpose bucket valve spool. Therefore, movement of the cylinders is stopped until the multipurpose bucket control is moved again.
Close Operation
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| Illustration 2 | g01929878 |
Close operation (11) Anti-drift valve (12) Multipurpose bucket control valve (13) Multipurpose bucket cylinders (14) Line relief valve (multipurpose bucket rod end) (15) Line relief valve (multipurpose bucket head end) (19) Accumulator (20) Flow from the charge circuit of the right drive pump (22) Margin relief valve (24) Pilot control solenoid (26) Implement pump (27) Hydraulic oil tank | |
When the multipurpose bucket control is moved to the CLOSE position, the solenoids allow pilot oil to flow to the right end of multipurpose bucket valve spool (12). This causes the valve spool to move to the left.
The movement of multipurpose bucket valve spool (12) causes the load signal pressure to increase. The pressure at implement pump (26) increases. The oil from implement pump (26) now flows to the head ends of multipurpose bucket cylinders (13). This causes the cylinder pistons and rods to extend. The movement of the cylinder pistons and rods pushes oil out of the rod ends of the multipurpose bucket cylinders.
The oil from the rod end flows into the valve bank. Then, the oil travels to hydraulic tank (27) .
There are no detents on the multipurpose bucket control. When the multipurpose bucket control is released, the control moves to the HOLD position. The spring moves multipurpose bucket valve spool (12) back to the HOLD position. The oil in the multipurpose bucket cylinders is blocked by the multipurpose bucket valve spool. Therefore, movement of the cylinders is stopped until the multipurpose bucket control is moved again.