260
Hydraulic System
Proportional Valve
E
XPERT
™ vehicles with an automated arm are equipped with a proportional valve (see Figure 5
5), as
part of the
arm
vane pump, that powers all arm functions (gripper [open/close], lifting arm [extend/
retract, up/down], chute [left/right], etc.) and other options.
As such, the amount of flow coming out of it will depend on the position of the spool inside a valve
section. This feature, called proportional control, allows infinite control of the arm speed and
movement.
Each section of this valve is actuated by an electric coil located under the valve.
Figure 5
-
5 Proportional valve
•
Input/output cover
: provided with main relief valve
•
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
Chute
(co-mingle units only)
Gripper (open/close)
Lifting arm (up/down)
Lifting arm (extend/retract)
Electric coil
Summary of Contents for EXPERT
Page 1: ...EXPERT TM MAINTENANCE MANUAL...
Page 2: ......
Page 3: ...EXPERT MAINTENANCE MANUAL...
Page 10: ...viii Table of Contents...
Page 18: ...8 Introduction...
Page 244: ...234 General Maintenance...
Page 251: ...Lubrication 241 Figure 4 11 Glass compartment lubrication chart optional...
Page 252: ...242 Lubrication Figure 4 12 EXPERT lubrication chart...
Page 264: ...254 Lubrication...
Page 320: ...310 Hydraulic System...
Page 357: ...Troubleshooting 349...
Page 358: ...350 Troubleshooting...
Page 386: ...378 Multiplexing...