h) Tighten the adjustment screw.
Prevent the impeller from rotating.
Tightening torque: 22 Nm (16 ft-lb)
i) Tighten the screw a further 1/8 turn (45°).
j) Check that the impeller can rotate freely.
3. Measure the clearance.
Final clearance: 0.1–0.5 mm (0.004–0.02 in)
4. Fit the cutting ring and tighten the screws.
6.7.4 Install the cutting wheel
1. Fit the plastic shim between the cutting ring and the cutting wheel.
The 0.19 mm (0.007 in.) thick plastic shim is a spare part: Adjustment washer
811 62 50.
2. Fit the cutting wheel to the adjustment screw until the wheel touches the plastic shim.
3. Fit and tighten the set screw.
Tightening torque: 55 Nm (41 ft-lb).
4. Make sure that the impeller and cutting wheel can rotate freely.
5. If the cutting wheel does not rotate freely, then adjust it:
a) Prevent the cutting wheel from rotating, and loosen the set screw.
b) To increase the clearance, prevent the adjustment screw from rotating and turn the
cutting wheel counterclockwise.
c) Make sure that the impeller and cutting wheel can rotate freely.
d) Measure the distance between the cutting wheel and the cutting ring.
6 Maintenance
48 Flygt 3069 Installation, Operation, and Maintenance Manual
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