User's Guide ______________________________________________________________________
188 _________________________________________________________________ M211296EN-A
Replacing Bearings of WAA151
Replacement of the bearings should only be done by a trained technician.
To replace the ball bearings, follow the procedure below and refer to
Figure 112 on page 191.
1. Open the cup wheel fixing screw with a 2-mm Allen key. Remove
the cup wheel assembly.
CAUTION
The cup wheel fixing screw has been treated with sealant. Do not remove
the fixing screw to ensure perfect sealing after reassembling.
2. Loosen the hex nut of the connector (use a 22-mm tool).
CAUTION
Be careful not to bend the connector pins.
3. Loosen the three pan head screws at the bottom of the sensor body
(use a 7-mm tool).
4. Remove the lower body assembly by pulling it straight outwards.
5. Loosen the spacer screws with a 7-mm tool and disconnect the
heating element outlet.
6. Remove the printed circuit board including the opto-coupler.
CAUTION
Do not twist or bend the connector. This may break the pins.
7. Loosen the fixing screw of the chopper disc with a 2-mm Allen key
and remove the chopper disc.
8. Remove the external retaining ring (using narrow-pointed pliers).
9. Remove the spacer ring.
10. Remove the internal retaining ring at the bottom of the shaft (using
narrow-pointed pliers).
11. Remove the lower bearing.
12. Push out the shaft downwards through the upper body.
13. Remove the top bearing after pulling out the shaft.
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