Work on the product
Checking the backlash 65
TK Elevator
BA, TW45 | 6231003860 | 03/2023
Fig.34 ATR_2_12_0060_0
Item Designation Item Designation
1 Ventilation, filling opening 2 Oil gauge glass
3 Oil drain 4
7.5 Checking the backlash
If the running performance deteriorates, this might have been caused by ex-
cessive backlash in the worm gear toothing.
Wear on the worm wheel gear toothing changes the existing tooth thickness
and this can be determined using the following measurement of the backlash.
NOTICE
Backlash too great!
Teeth on worm wheel worn; deterioration in running performance.
If the running performance deteriorates (noises, jerking, etc.), measure
the backlash.
If a wear limit value (backlash) of 1.5 mm is reached, replace the toothing.
1. Disconnect the power from the installation and secure it against reactiva-
tion.
2. Secure the car and counterweight against movement.
3. Take the load off the traction sheave.
The traction sheave must be free to move.
4. Perform the measurement with the service brake closed.
5. Release the emergency brake, if present.
6. Fit a measuring attachment to the traction sheave, e.g. screw clamp.
7. Specify the measuring radius (M) and mark the measuring point.
The radius (r) for the TW45C = 95 mm.
8. Attach a dial gauge with magnet stator at the gear drive housing and align
to the measuring point (M).
9. Turn the traction sheave by hand until the dial gauge pointer moves.
10. Move the traction sheave back and forth until resistance is felt.
11. Read off the dial gauge (ME).
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