32
4111-0024 — Apr. 2020
© 2020 Systems, LLC
Symptom
Possible Cause
Solution
Platform does not rise
or lower. Motor does not
energize.
Motor overload device
tripped.
Reset overload relay or breaker. Determine cause of
device tripping.
Motor starter (three-
phase) or motor relay
(single-phase) not
energizing.
Check voltage at starter or relay coil.
• If voltage is present and starter or relay does not
energize, replace starter or relay.
• If voltage is not present, check all components in
series with the starter or relay coil.
• Check all fuses inside the control panel(s). Replace
any blown fuse(s) with a fuse of equal specification.
• Make sure the correct voltages are present at the
proper locations inside the control panel(s).
Before performing the detailed troubleshooting procedures, check the following items first:
TROUBLESHOOTING
When service under the dock leveler is required,
always lock all electrical disconnects in the OFF
position after raising the platform and engaging the
maintenance prop.
Always post safety warnings and barricade the
work area at dock level and ground level to prevent
unauthorized use of the dock leveler before
maintenance is complete.
A hard hat or other applicable head protection
should always be worn when working under or
around a dock leveler.
Always stand clear of platform lip when working in
front of the dock leveler.
It is recommended and good safety practice to use
an additional means to support the dock platform
and lip anytime when physically working in front of
or under the dock leveler. This additional means
may include, but is not limited to a boom truck, fork
truck, stabilizing bar or equivalent.
FIG.“A”
File Name: 1751-1293
Decal Size: 3.75 x 6.25
CRUSH HAZARD
DO NOT WORK UNDER OR IN FRONT OF
DOCK LEVELER
unless ALL props have been
properly positioned and secured. First, back out
bolt to position side maintenance prop(s) as shown
in figure “A” below. Then position storage prop and
secure with prop lock pin as shown in figure “B”
below. Failure to do so will result in death or
serious injury. Refer to owner’s/user’s manual for
proper procedure.
Prop Lock
Pin
Storage
Prop
Stored
Position
Maintenance
Position
Bolt
Maintenance
Prop
1751-1293
FIG.“B”
