In the event of a power failure, a defective hoist motor or a defective brake coil, the load can be lowered by hand. To do so, the brake is released manually using the brake release lever.
Lowering a load by hand is an emergency measure.
The pictures show the procedure on a GM 1000 modular wire rope hoist. The procedure on GM 800 does not differ significantly from this.
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Danger from falling load! The load accelerates quickly if the brake is released too far. This could cause the load to lower in an uncontrolled fashion. Warn persons around the crane about the emergency lowering procedure. Activate the brake release lever very carefully. |
Cordon off the operating range around the crane sufficiently.
Inform persons around the crane about the emergency lowering
procedure.
Remove the screws on the fan cover.
Pull the fan cover off to the rear.
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Threaded rod |
Brake release lever |
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Screw a threaded rod M8 into the brake release
lever.
Carefully, and slowly, tilt the brake release lever backwards using
the threaded rod.
● The brake is released, the load slips downwards.
Tilt the brake release lever back if the load is losing height too
quickly.
The brake lining is subject to a heavy load during emergency lowering and can quickly overheat. Therefore, the brake rotor must be replaced afterwards. See Replacing the brake rotor on the hoist drive.
