OPERATING MANUAL DAF290 MAINTENANCE
ThyssenKrupp Aufzugswerke GmbH
7. Maintenance
7.1 Replacing brake shoes
Note: With a remaining lining thickness less or equal to 3 mm, or if the brake
linings have become unusable and the required deceleration is not achieved,
the brake linings have to be replaced.
Caution: Before starting work, the counterweight and elevator car must be
secured against uncontrolled movement. The installation must be de-
energised. No torque may be acting on the traction sheave.
1.) Removing the brake shoe:
• Remove pressure spring screw from brake shoe until the shoe can be
moved freely. Remove the locking ring at the brake shoe pin.
• Remove brake shoe and refit the adjusting screw for brake magnet and
test switch actuation at approx. the same distances on the new brake
shoe.
• Install a new brake shoe on the machine.
• Reseat or bed in the lining to 75% contact area of the lining surface.
• Check the lateral alignment of the brake lining in relation to the brake
disc support. In the case of misalignment, disassemble brake shoe and
align to the brake disc centre by rearranging the spacer washers at the
shoe bearing. (Washer thickness = 1 mm.)
• Screw pressure spring with screw onto brake shoe until the brake lining
is against the brake disc.
Important: The test switch screw must not touch the switch contact, or only
very lightly, because otherwise the switch will be damaged.
2.) Setting the brake shoe stroke:
With the solenoid actuated, the air gap between brake disc and brake
lining should be 0.3 mm
• Set stroke as described in Chapter 7.2
• Change and set the second brake shoe in the same way.
• Secure setting by tightening the counter nuts.
3.) Setting braking deceleration
Set the deceleration as described in Chapter 7.3.
4.) Setting the brake test switches
Make the setting of the brake test switch at the brake shoes as described
in Chapter 7.4.
5.) Checking the settings on the replaced shoes
• After replacement, operate with electrical recall and observe whether
both brake shoes open evenly.
Important: After every brake shoe change, the shoe stroke, braking
deceleration, setting and operation of the test switches must be checked and
corrected if necessary.
Product has been
replaced
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