212 Lifting Arms
Figure 10-6
Bolts
6. Check both arm stowed limit switches.
For more information, see Adjusting Arm Stowed Limit Switches (2) on page 90.
7. Lubricate arm moving parts as per the arm lubrication chart on page 228.
8. Lock out and tag out the vehicle (see Locking Out and Tagging Out the Vehicle on page 12).
Gripper Auto-Closing System
Lifting arms are equipped with a system that automatically closes the gripper if the operator forgot to
close it. The system automatically closes the gripper at a preset height, preventing collision between
the gripper and the hopper wall.
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. As soon as the hydraulic system is
brought online (pump switch ON), the system closes the gripper automatically before the operator
can move the arm.
For this to work, the system acts as though the operator would push the
CLOSE GRIPPER button on the
joystick.
The “auto-closing system” is activated by a limit switch located on the side of the arm. When the
gripper passes the auto-closing limit switch, a signal is sent to the ON/OFF valve coil to close the
gripper.
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