34
4111-0024 — Apr. 2020
© 2020 Systems, LLC
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, contact Systems, LLC Technical Services.
Pressure relief set too low.
Increase pressure relief. See page 29 for instruction.
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 hydraulic fluid, see pages 26-27 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
pages 26-27 for proper fluid level and type.
Damage or blocked
hydraulic hose(s) and/or
valve(s).
Replace damaged hose(s). Check and remove
blockage from hose(s) and/or valve(s).
Pressure relief set too low.
Increase pressure relief. See page 29 for instruction.
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 starts to
raise from the lowered
position.
Pressure relief set too high.
Decrease pressure relief. See page 29 for
instruction.
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
