Poweramp VEH SERIES HYDRAULIC - Manual (Page 18)

Always barricade the work area to prevent unauthorized use of the unit during repair or mainte-
nance procedures.
Always lock OFF all electrical disconnects when servicing the unit. Always stand clear of the
dockleveler lip when working in front of the unit.
Perform the following proceedures prior to beginning detailed troubleshooting:
A. Check all fuses inside the control assembly(s). Replace any bad fuse with one of
equivalent specification.
B. Confirm presence of necessary voltages inside the control assembly(s).
WARNING
TROUBLESHOOTING GUIDE
DOCK LEVELER
PROBLEM CAUSE(S) SOLUTION
Leveler does not operate.
Motor does not energize. 1. Motor overload device
tripped. 1. Reset Overload relay (3 phase) or replace fuse (1
phase). Determine cause of device tripping. NOTE: If
replacing fuse, replace with device of equal
specifications.
Leveler does not operate.
Motor energizes but does
not run (motor hums,
overload device should
trip). 1. 3 phase units only -
voltage at one line is absent
(motor being single phased). 1A. Fuses at motor branch circuit overcurrent device
only - check for tripping fuse. Replace fuse. Determine
cause of fuse tripping.
1B. Check motor starter for component failure.
Disconnect wires at load side of starter. Use voltmeter to
read lin-to-line voltages at line side and load side of
starter. Line side and load side voltage values should be
nearly identical. Replace starter if values not identical.
1C. Check all wiring to motor for high resistance (loose)
or no connection.
2. Replace motor..
Leveler will not raise.
Pump operates in
pressure relief. 1. Load on platform. 1. Remove load. Unit is designed to raise no more than its
own weight as a safety feature.
Leveler operates slowly. 1. Low hydraulic fluid. 1. Add fluid. See Preventive Maintenance section, page
13.