Shim High Pressure Stage Impeller - Waterous HL Series Overhaul Instructions

1. Using shim pack Waterous part no. 52880, install two (2) .010 in.
(.254 mm) thick shims on the impeller shaft. Note that the shim pack
includes two (2) .002 in. (.050 mm), one (1) .005 in. (.127 mm) and
three (3) .010 in. (.254 mm) shims.
2. Install impeller key and high pressure impeller.
3. Install a temporary spacer on the shaft. See Spacer Detail for fabric­
ation details.
4. Install the impeller washer and locknut.
5. Restrain the companion flange on the drive end of the pump from
moving and torque locknut to 140-150 lb-ft (190-203 N•m).
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Depth
Micrometer
High Pressure
Impeller
F−1031, Section 4321
Reassembly - Shim High Pressure Impeller
Determine Amount of Shims Required
Shims
Impeller
Balance Hole
Volute Body
Impeller Locknut
6. Check the gap measurement between the high pressure and volute
body with a depth gauge. Insert the gauge through one of the holes in
the impeller. See Depth Detail below.
7. The gauge must read between .639 and .642 (16.23 and 16.31 mm).
This dimension sets the clearance at .009 to .012 in. (.23 to .31mm).
8. If the measurement does not meet the required gauge reading, add or
remove shims until the required clearance is achieved.
9. Remove the impeller and temporary spacer leaving the correct shims on
the impeller shaft.
Impeller Washer
Shims
Impeller Key
High Pressure Impeller
Spacer
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