194 Lifting Arm
Gripper Auto-Closing System
The HELPING-HAND™ lifting arm is equipped with a system that automatically closes the gripper in
the event the operator forgets to close it. It does so at a preset height, preventing a collision between
the gripper and the hopper walls.
Also, if the vehicle is parked for a long period of time with the gripper inside the hopper, the gripper
cylinder may leak pressure, causing the gripper to open by itself. But as soon as the hydraulic system is
brought online (P
UMP switch “ON”), the auto-closing system closes the gripper automatically before
the operator can move the arm. In this, the system acts as though the operator had pushed the
CLOSE
GRIPPER button on the joystick.
The Gripper Auto-Closing System is activated by a limit switch located at the base of the H
ELPING-
H
AND™ arm. When the gripper reaches a certain height, a signal is sent to the on/off valve coil to close
the gripper.
Figure 10-7
Gripper Auto-Closing limit switch
Figure 10-8
Gripper closed (left) and open (right)
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