HADEF 46/21E Installation, Operating And Maintenance Instruction page 10

 Disengaging clutch
The disengaging clutch separates the winch drum
from the gear in order to pull off the uncharged
wire rope.
Illustration 4
DANGER!
Disengaging of the drum may never be effected under load and/or when current is on!
4.4.1 Emergency brake release - hoist (option)
Electric Electric-EX Pneumatic + EX
A
Manual emergency brake release for
lowering the load in case of power
supply failure by means of lever (A).
Illustrattion. 5
10 5.52.262.00.01.13