Poweramp POWERHOOK SERIES - Manual (Page 46)

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, see Maintenance section for proper fluid
level and type.
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.
TROUBLESHOOTING DOCK LEVELER
Trouble shooting Levelers see appropriate manuals
4111-0010 — Nov 2010 44