26
Step 2
Remove the rotorcase to allow fitting of product seals.
4. Maintenance 4.4 Assembly
Step 2
Apply liquid gasket to the face of the cover where it mates with the gearcase.
Step 3
Carefully slide the cover over the shaft ensuring the lip seal is
centred and not cut or damaged. Tighten the screws (6).
4.4.8 Fitting and shimming rotorcase
The rotorcase may require re-shimming if new components have been fitted. Back clearances must be checked before operating
the pump.
NOTE!
Your supplier can advise the correct clearances from the pump serial number. Should they need adjustment follow steps below.
Any incorrect setting of clearances is likely to damage the pump in operation. Shims vary in colour for different thickness, and are
grouped in equal packs at the top and bottom of the rotorcase held in place by shim retainers.
4.4.7 Fitting gearcase cover
Step 1
Clean the gearcase cover bore and remove all gasket material from the face. Press a new lip seal (7) into the cover (5).
Step 1
1. Remove the shim retainers (8A) and fit one of the thinnest shims (8) to top and bottom position.
2. Replace shim retainers and screws (8B).
3. Fit the rotorcase (9) to the gearcase (1), tighten the rotorcase retaining nuts (4) and fit the rotors (17).
The back clearances can now be measured using feeler gauges. The additional shimming required to bring the clearances within
tolerance can be determined, fit additional shims and re-check the clearances.
