MAINTENANCE MANUAL
GP/146/99. Issue 9. October 2005
To Refit
When the correct clearance has been obtained, fit the cover plate. After ensuring
the joint face (A) on the pump body and the joint face on the cover plate are clean,
smooth and free from deformation, align the holes in the cover plate with the holes in
the pump body and clamp, using twelve M10 x 1.5mm stainless steel socket head
screws tightened to a torque of 57nm (42 lbs ft).
Spin the impeller to check for fouling, then remove the nut and spacer tool.
©Hale Products Europe LTD, Warwick
16
Note: the clearance between the impeller and the cover plate should be set at 0.23/0.33
(0.009”/0.012”) shimming where shown.
Impeller Clearance
Spacer - used only for
clamping impeller while
clearances are being checked
Impeller Shims
Clamping Sleeve
Impeller
Cover Plate
Face A
Fig 4-2
Assembly and clearances of the high pressure impeller.
Section 5
CARBON SEAL AND SEATING ASSEMBLY
When the high pressure impeller is removed, the mechanical carbon face seal is
accessible for examination. In the event of excessive leakage past the carbon seal
and out of the drain hole in the pump head, remove low pressure and high pressure
impellers per Sections 3 and 4. Examine the carbon seal. If the face of the carbon
seal seating ring is scored, it is essential to replace it and to fit a new seating ring
which is mounted within the rear face of the high pressure impeller. To remove the
carbon seal seating ring, remove two M6 nyloc nuts and washers and gently remove
it, taking care not to lose the wave spring. The stationary carrier may be left in place
if only the wearing faces are being replaced.
GP/146/99
WTmaint - Issue9. 10-2005October 2005
