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Sticking Solenoid
When an elevator reaches its upper or lower level, an electrical contact is made to release the safety interlock of the appropriate door (either the upper- or lower-level access door to the elevator car). This interlock is unlatched by a solenoid when the car reaches its "stop" position.
Our elevator repairman determined the solenoid was occasionally overheating, which led to tightening on the internal solenoid shaft, binding it and preventing the proper release of the safety latch.
Although it was possible to manually force the shaft home and release the latch, this procedure is inconvenient and possibly unsafe. A brief shot of WD-40 was enough to solve the problem of the shaft binding, allowing the system to function normally. After using WD-40, the operation of the elevator has been normal for several months.
Make sure that you check the manufacturer's warrantee before using WD-40 on an elevator, so as not to void it.
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Brought to you by...
John Hosbein
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Did you know...
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WD-40 removes sap and splattered bugs from cars |
The trade secrets described in the WD-40 Job Site were provided to WD-40 Company by industry professionals, and do not constitute recommendations or suggestions from WD-40 Company. WD-40 Company has not tested these tips. Consumers should exercise caution when attempting to complete a project, and take heed of any warnings printed on the WD-40 packaging.
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