Poweramp VH SERIES HYDRAULIC 10.2011 - Manual (Page 35)

33 4111-0002 — Sept 2010
TROUBLESHOOTING
Symptom Possible Cause Solution
Platform does not
rise. Pump operates in
pressure relief mode.
Heavy object(s) on platform. Remove object(s) from platform.
NOTE: For safety reasons, the dock leveler
is designed to lift only the platform’s
own weight.
Dock leveler binds. Check for visible obstructions that could cause
binding. Remove obstructions. If no obstructions
found, call Poweramp Technical Services. See
inside back cover for phone number and address.
Pressure relief set too low. Increase pressure relief. See Adjust Main Pressure
Relief in the Adjustment section.
NOTE: The pressure relief valve must not
be set at a level that causes the
motor operating current to exceed
the full load amp value* at any time,
including when operating in pressure
relief.
* The full load amp value can be found on the inside cover of the
control panel.
Platform rises slowly. Low hydraulic fluid. Add fluid as needed. See Periodic Maintenance in
the Maintenance section.
Contaminated hydraulic
system.
Clean and inspect valves. Flush contaminated oil
from hydraulic system. Fill system with new oil. See
Periodic Maintenance in the Maintenance section.
Damaged or restricted
hydraulic hose(s).
Replace damaged hose(s). Remove restriction.
Pressure relief set too low. Increase pressure relief. See Adjust Main Pressure
Relief in the Adjustment section.
NOTE: The pressure relief valve must not
be set at a level that causes the
motor operating current to exceed
the full load amp value* at any time,
including when operating in pressure
relief.
* The full load amp value can be found on the inside cover of the
control panel.
Pump motor loads down
when platform reaches
the full raised position.
Pressure relief set too high. Decrease pressure relief. See Adjust Main Pressure
Relief in the Adjustment section.
NOTE: The pressure relief valve must not
be set at a level that causes the
motor operating current to exceed
the full load amp value* at any time,
including when operating in pressure
relief.
* The full load amp value can be found on the inside cover of the
control panel.