DU-WS-0012-01 Rev B 5/24/16 GCX Corp. Page 7 of 15
7.1 Adjusting Counterbalance
The VHM-PL arm is shipped in its upmost position (top of
height adjustment range)
– be sure it is still in this position
before proceeding. The Arm must be unlocked to perform
the counterbalance adjustment. This is done by pulling the
handle grip
and inserting a 1/8” hex wrench into the handle
grip holes as shown. When grip is released, the hex wrench
will stay in position and hold the handle grip in the un-lock
position (the arm will freely move up and down).
Remove
hex key after completing counterbalance adjustment.
Installation Note: VHM-PL (locking)
7.0 Adjusting the Arm
Counterbalance Adjustment
–
The Counterbalance Adjustment Screw is located under the Arm in front of the rear pivot
assembly. Grasp the mounted device or handle (making sure the hex wrench does not fall out) and move the Arm to a level
horizontal position. Using a 5/32
” hex wrench, tighten (+) or loosen (-) the Counterbalance Adjustment Screw.
Counterbalance is correctly adjusted when the mounted device can be moved up or down with minimal force and does not
rise or fall after releasing the Arm.
Installation Note:
Adjustments are factory pre-set. However, adjustments to counterbalance, tilt tension, swivel tension,
and pivot tensions may all be required to achieve optimal arm performance. Detailed instructions for making adjustments
follow in the section below. When properly adjusted the mounted device will move easily throughout the arms full range of
motion. Refer to the Routine Maintenance Check List in Section 11 for a quick guide to these functional checks.
Caution:
The counterbalance procedure is performed with the device(s) and accessories installed on the Arm.
When unlocking the arm to perform the counterbalance procedure, use caution as it may be necessary to
support the weight of the arm/mounted device(s). This process may require an additional person. Use caution
while performing this procedure.
Counterbalance
Adjustment Screw
