Wilo Rexa CUT GE Einbau- Und Betriebsanleitung Seite 158

en
9.6.1 Instructions on using screw lock-
ing devices
9.6.2 Which repair work may be carried
out
9.6.3 Readjusting the macerator
2 1
Fig. 11: Setting the blade gap
158
Maintenance and repair
▪ Wipe up spillage quantities of fluid and operating fluid immediately!
▪ Always replace O-rings, gaskets and screw locking devices!
▪ Observe the tightening torques in the appendix!
▪ Never use force when carrying out this work!
A screw locking device can be used on the screws. Screw locking is done at the factory
using two different methods:
▪ Thread-locking fluid
▪ Mechanical screw locking device
Always re-apply the screw locking device!
Thread-locking fluid
Medium-strength thread-locking fluid (e.g. Loctite 243) is used for the liquid screw
locking compound. This threadlocker can be loosened with increased force. If the
thread-locking fluid cannot be loosened, then the compound must be heated to ap-
prox. 300 °C (572 °F). Clean the components thoroughly after dismantling.
Mechanical screw locking device
The mechanical screw locking device consists of two Nord-Lock wedge lock washers.
The screw connection is secured by the clamping force. The Nord-Lock screw locking
device must only be used on bolts with strength class 10.9 which have been coated
with Geomet. The use of stainless screws is prohibited!
▪ Readjusting the cutting gap.
The gap between cutting plate and blade is approx. 0.1...0.2 mm (0.004...0.008 in). The
blade gap here is set using the shims between the rotating blade and the impeller. If the
gap becomes too great, cutting performance is impaired and clogging increases. In this
case, the gap needs to be readjusted.
Required tools
▪ Torque wrench with size 5 Allen key bit
▪ Size 5 Allen key
▪ Suitable equipment for fixing the rotating blade in place
Work steps
1
2
3
4
5
‡
Protective equipment has been fastened on
‡
Pump cleaned and disinfected if necessary
5
4 3
‡
The required tools are ready for use
1. Fix the rotating blade in place with suitable equipment.
2. Unscrew the blade fastening screw. WARNING! Danger of cutting injuries! The
blade has sharp edges. Wear suitable protective gloves.
3. Remove the blade.
4. Set a gap of 0.1 to 0.2 mm (0.004...0.008 in) by removing or replacing shims. At-
tention: NOTICE! The blade must not grind against the cutting plate.
5. Attach the blade again.
6. Screw in the fastening screw. Max. tightening torque: 37 Nm (27 ft·lb)
7. Measure the gap and repeat the work steps if necessary.
Blade
Cutting plate
Shims
Fastening screw
Impeller
WILO SE 2019-02