Hydraulic System 121
Proportional Valve
AUTOMIZER™ vehicles are equipped with a proportional valve (see Figure 5-3), as part of the arm vane
pump, that powers all arm functions (gripper [open/close], lifting arm [extend/retract, up/down],
chute [left/right], crusher panel [up/down], etc.) and other options.
As such, the amount of flow coming out of it will be according to the position of the spool. This
feature, called proportional control, allows infinite control of the speed and movement of the arm.
Each section of this valve is actuated by an electric coil located under the valve.
Figure 5-3
Proportional valve
• Input/output cover: provided with main relief valve
• Crusher panel section (optional): not proportional, with load sensor relief
• Chute section (optional): not proportional, with load sensor relief
• Gripper section (open/close): not proportional, with load sensor relief
• Lifting arm section (up/down): proportional, no load sensor relief
• Lifting arm section (extend/retract): proportional, no load sensor relief
Input /output cover
Crusher panel
Chute
(co-mingle units only)
Gripper (open/close)
Lifting arm (up/down)
Lifting arm (extend/retract)
Electric coil
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