Poweramp VH SERIES HYDRAULIC 10.2011 - Manual (Page 36)

34 4111-0002 — Sept 2010
TROUBLESHOOTING
Symptom Possible Cause Solution
Platform does not rise to
full height.
Low hydraulic fluid. Add fluid as needed. See Periodic Maintenance in
the Maintenance section.
Platform DOES rise to
full height, but lip DOES
NOT extend or extend
fully.
Low hydraulic fluid. Add fluid as needed. See Periodic Maintenance in
the Maintenance section.
Logic block (valve) lever
cable weight too low on
cable.
Adjust cable weight. See Adjust Cable Weight and
Down Speed Control in the Adjustment section.
Lip does not extend. Logic block spool valve
stuck in the up position or
valve lever binding so that
the lever will not push the
spool down.
Apply penetrating oil to spool area and valve lever
pivot at top of logic block.
If necessary, disconnect the valve lever from logic
block. Move spool valve up and down until spool
valve slides freely. If the spool valve cannot be
made to slide freely, replace spool valve.
Lubricate valve lever pivot with white lithium grease.
Lip extends almost
immediately when the
RAISE button is pushed.
Platform rises after lip is
fully extended.
Logic block spool valve
stuck in the down position or
valve lever binding causing
lever to prematurely push
the spool down.
Apply penetrating oil to spool area and valve lever
pivot at top of logic block.
If necessary, disconnect the valve lever from logic
block. Move spool valve up and down until spool
valve slides freely. If the spool valve cannot be
made to slide freely, replace spool valve.
Lubricate valve lever pivot with white lithium grease.
Platform locks into
“safety” as platform
lowers. Lip drops to
vertical position.
Platform lowering speed is
too fast.
Adjust platform down speed control.
See Adjust Cable Weight and Down Speed Control
in the Adjustment section.
NOTE: Extreme cold weather OR incorrect fluid
may cause platform to lock. Adjustment is same.