364111-0021-N — Sept. 2018© 2018Symptom Possible Cause SolutionPlatform does not rise.Motor does not energize.Motor fuse blown. Reset circuit panel or disconnect fuse. Determinecause of overload.Motor failureCheck voltage to motor.• If voltage is present and motor does not energize,replace motor.• If voltage is not present, check all components inseries with the motor.Platform does not rise.Motor hums, but does notrun.Incorrect voltage is presenton line.Check line for proper voltage• If proper voltage is not present, check allcomponents in series with the motor.• If proper voltage is present and motor does notrun, check for obstructions.• If no obstructions are found, replace motor.• Check all fuses inside the control panel(s). Replaceany blown fuse(s) with a fuse of equal specification.• Make sure the correct voltages are present at theproper locations inside the control panel(s).Before performing the detailed troubleshooting procedures, check the following items first:TROUBLESHOOTINGWhen service under the dock leveler is required,always lock all electrical disconnects in the OFFposition after raising the platform and engaging themaintenance prop.Always post safety warnings and barricade thework area at dock level and ground level to preventunauthorized use of the dock leveler beforemaintenance is complete.A hard hat or other applicable head protectionshould always be worn when working under oraround a dock leveler.Always stand clear of platform lip when working infront of the dock leveler.Unless the dock leveler is equipped with a tetheredremote, two people are required to engage themaintenance prop: one person to operate the unit,the other person to engage the maintenance prop.In addition, it is recommended and good safetypractice to use an additional means to supportthe dock platform and lip anytime when physicallyworking in front of or under the dock leveler. Thisadditional means may include, but is not limited to aboom truck, fork truck, stabilizing bar or equivalent.