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9 HYDRAULIC LIFT UNIT
9 HYDRAULIC LIFT UNIT
9.1.8
Position feedback link
When the control lever is set to the "up" position, it will push the spool of the control valve, located at the
rear of the hydraulic cylinder case, through the link. The oil will flow into the cylinder to push up the
piston, causing the lift arm to rise.
However, if the lift arm fails to move, a "rise" signal continues to be output.
For this reason, even if the control lever is in the "up" position, the spool of the control valve will be
returned to the "neutral" position by the action of the feedback rod attached to the lift arm. The same
applies when the control lever is in the "down" position.
When the control lever is set in the "up" position
Sudden rise
Slow rise
Neutral
(A) Main spool
(B) Control lever (up)
(C) Feedback rod
(D) Lift arm
185
EF494T TM 06/2011 edition
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