By turning the spring adjustment nut (11), pretension the brake spring (12) unit
the upper edge of the piston plate (13) shows the required value on the braking torque
2.2 Lifting gap
Engage brake, i.e. de-energise lifting device,
Lift the rubber shroud covering the top of the solenoid, exposing the top of the
lifting rod and the locking washer.
Y turning the connecting rod at the nut (5) adjust the reserve stroke (X) of approx.
`X' must be checked due to shoe wear and adjustment on connecting rod.
Refer to table for dimension (X) • Energise lifting devices
The gap between the rake shoes and the drum (shoe clearance gap Y) should be 0,3
mm. Check using feeler gauge.
The shoe clearance gap must be uniform and the same size at both shoes, if not, the
brake has to be adjusted again.
3.1 Control of the brake lining wear
The reserve stroke at the lifting device (X) decreases with increasing lining wear
and must therefore be regularly controlled and readjusted.
If the reserve stroke at the lifting device has decreased to the half of the desired
value, the brake must be readjusted as described under 2,2,
3.2 Replacement of the brake shoes
When reaching the minimum lining thickness of approx. 3 to 5 mm; the worn-out brake
linings must be replaced. For this purose, the brake must not be dismantled if the
following instructions are adhered to:
Energise Lifting Device.
Release brake shoe pin (7) after removing the cotter pin/circlips and pivot the brake.shoe
(6) out upwards.
Open the brake by turning at the nut (5) of the connecting rod so that the new brake
shoe can be installed in reverse sequence.
Readjust lifting gap as per item 2.2.
Control adjustment of braking torque (item 2.1) and correct it if necessary.
Brakes with new brake lining need a running process in order to get an adequate contact
pattern of the friction surface and to reach the full braking torque. The braking
effect can be reduced in this phase and an increased wear of brake lining can occur.
Remove base plate pin (3), swing arm (2) upwards and push brake over the brake drum
For reinstallation of brake arm, insert the coupling bolt (21) of the synchronous
lifting mechanism again into the bore of the brake arm, mount the base plate pin
(3) again and secure it via circlip.
(De-energize the brake and) adjust it towards sides and height so that the brake
drum axis is in the middle between the brake and shoes (6) and that the brake drum
protrudes uniformly at both sides of the brake shoes.
Underlay the base plate (1) with suitable shims and tighten it with screws at the