Inspection; Impeller Wear; Mechanical Seal; Oil Seals - Waterous PB18 Series Operation Instructions Manual

Page 17 of 20
After the pump has been disassembled, check the following before reassembly:

Impeller Wear

1. Check the wear hubs on the impeller for excessive
wear, or clearance with the wear rings. If the clear‐
ance exceeds 0.020/0.025in., or if the impeller hubs
are badly scored or grooved, replace the impeller and
both wear rings. Tapped holes are provided in each
wear ring to aid in removing them.
2. Check all O-rings for cuts,nicks, or other damage.

Mechanical Seal

1. When a mechanical seal is removed, it must be re‐
placed.
2. Check the shaft sleeve in the area under the mechani‐
cal seal bellows to be sure it is free of severe
scratches or other damage. On geared pumps, check
the impeller hub in the area under the mechanical
seal to be sure it is free from scratches or other dam‐
age.
Note: Discard spring retainer if included with
mechanical seal.
Figure 15. Mechanical Seal Installation
Coat O-ring with
oil before installing
in head.
If lubricant or other foreign material
should get on the sealing surfaces,
wipe it off with denatured alcohol and
a lint-free cloth.
Surface opposite O.D. chamfer
must face primary ring.
Check the impeller shaft and engine crankshaft sleeve for
signs of severe wear from the oil seal.
Ball Bearing, Gears and Needle Bearing
Check for severe wear and replace as necessary.
Coat inside of bellows before
installing. Use a water-based
lubricant.
Elastomer
slide over shaft to seat with
stationary ring.
IL2368

INSPECTION

Oil Seals

Note: On direct mounted
pumps bellows assembly
rides on shaft sleeve.
On geared pumps, the
bellows assemlby rides
on the impeller hub.
Note: If Waterous Mechanical
Seal Lubricant part no. 52608
is not available, P80 rubber
lubricant, straight dish soap
or glycerin may be substi‐
tuted.
bellows must
Lubricate shaft or shaft
sleeve before installing
bellows assembly. Use a
water-based lubricant.