DU-MND–0013-01 Rev A 9/28/10 GCX Corp. Page 10 of 10
8.0 Troubleshooting the VHM Arm
Symptom
Possible Cause
Remedy
Channel not plumb. Check with
level.
Adjust Channel to plumb, or
reinstall Channel.
Weight of instrument not
compatible with Load Rating of
the Arm.
Mount instrument on arm with
compatible Load Rating.
Swivel hardware loose.
Adjust Swivel Nut (section 4.5).
Pivot hardware loose.
Adjust Pivot Bolt (section 4.4).
Mounting surface (e.g. wall, side
of anesthesia machine, etc.) not
structurally sound (does not hold
mounting hardware).
Mounting surface must be
reinforced or Channel must be
relocated.
Mounted instrument does not
appear level or parallel to the
floor.
Channel loose at mounting
surface.
Check for plumb and tighten, or
relocate (reinstall) Channel.
Arm not counterbalanced
correctly for weight of the
instrument.
Perform counterbalance
adjustment per section 4.1.
Instrument drifts up or down when
the Arm is unlocked.
Weight of mounted instrument
(load) not compatible with Load
Rating of Arm.
Use arm with compatible Load
Rating, and perform
counterbalance adjustment per
section 4.1.
Arm pivots too freely.
Pivot Bolt too loose.
Arm does not pivot easily.
Pivot Bolt too tight.
Adjust Pivot Bolt (section 4.4).
Instrument swivels too freely.
Swivel Nut too loose.
Instrument difficult to swivel.
Swivel Nut too tight.
Adjust Swivel Nut (section 4.5).
Tilt Adjustment Lever too tight.
Instrument difficult to tilt.
Excessive tilt tension.
Tilt Adjustment Lever too loose.
Instrument will not maintain tilt
position.
Insufficient tilt tension.
Adjust tilt and tilt tension per
section 4.6.
Arm difficult to move up or down
when unlocked.
Arm not counterbalanced
correctly for weight of mounted
instrument.
Perform counterbalance
adjustment per section 4.1.
Arm inadvertently slides down
Channel.
Set Screws (4) in Slide are loose.
Reposition Arm and tighten set
screws.
Arm not counterbalanced
correctly for weight of mounted
instrument.
Locking Knob (Arms with Spring
Lock) will not pull out (release).
Weight of mounted instrument
(load) not compatible with Load
Rating of Arm.
Perform counterbalance
adjustment per section 4.1.
Counterbalance Bolt difficult to
adjust.
Arm not locked in a horizontal
position.
Reposition Arm and lock in
horizontal position.