Slurry Pump
WH17AM1AAA0EN_04B.DOC JAN 04-W08
Care and maintenance
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9.5 Dismantling and assembly
9.5.1
Setting pump clearances
• Impeller clearance adjustment (Standard Slurry Impeller)
These adjustments enable the back (frame side) and front (inlet side) running clearances
to be kept to a minimum so that maximum operating efficiency is maintained throughout
the wear life of the pump. The back impeller clearance is adjusted using the adjusting
screw and the front clearance by adding or removing case shims.
When no further adjustment is possible, the pump must be disassembled and inspected
and worn parts renewed.
1. Isolate the drive motor and attach suitable warning plates to the relevant switches. It
is advisable to remove the fuses and/or lock the isolator open to avoid accidental
starting.
2. Remove the drive safety guard and disconnect the belt drive or direct coupling as
applicable.
3. Where fitted, a mechanical seal requires setting for disassembly. Section 9.5.3
would provide the relevant instructions, where applicable.
4. Back (Frame Side) Clearance
This clearance, which should be adjusted first, is achieved by moving the complete
rotating assembly towards the drive end:
a) Pull off cover (P24) from the bearing frame and slacken housing clamp screws
(P16) - 2 off, tension screws (P23) - 2 off, and adjusting screw locknut (P38).
b) While rotating shaft (B11) by hand, take up the back clearance by turning
adjustment screw (P19) against retaining plate (P22) until impeller (W3) is just
touching back liner (W4).
c) Back off the adjusting screw through the saddle until the end of the screw
touches bearing frame (P14).
d) Rotate the adjusting screw one turn. Check that impeller (W3) clears back liner
(W4).
e) Tighten tension screws (P23), housing clamp screws (P16) and adjusting screw
locknut (P38).
NOTE:TENSION AND CLAMP SCREWS MUST BE TORQUE TIGHTENED TO THE TORQUE VALUES
LISTED IN TORQUE SETTING TABLES, SECTION 11.1.
Having completed the back clearance, the front clearance should be adjusted as follows:
5. Front (Inlet Side) Clearance
NOTE:THE COMPLETE BEARING FRAME AND ROTATING ASSEMBLIES ARE MOVED TOWARDS
THE CASE WHEN SETTING THIS CLEARANCE.
a) Slacken bearing frame screws (P11) and nuts (P1) on case bolts (P4).
b) Insert a jack screw (P10) in each side of the frame flange and turn the screws
evenly to withdraw the bearing frame by approximately 4mm.
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