32
4111-0035 — Dec. 2018
©
2018 Systems, LLC
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.
Unless the dock leveler is equipped with a tethered
remote, two people are required to engage the
maintenance prop: one person to operate the unit,
the other person to engage the maintenance prop.
In addition, 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.
• 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:
TPR Troubleshooting
Symptom Possible Cause Solution
TPR vehicle restraint
lights do not ash, and
the hook does not raise.
Power source malfunction. Check for blown fuse at branch circuit disconnect.
Incorrect wiring. Verify electrical schematics.
TPR vehicle restraint
lights are ashing, but
the hook does not raise
or lower to full extent.
Chain is loose or broken. Adjust or replace as required.
Low incoming voltage. Verify incoming power at L1 and L2.
Drive motor faulty. Check motor, repair or replace.
Incorrect wiring. Verify wiring per electrical schematic.
Incorrect brake torque. Brake torque should greater than 42 ft-lbs.
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