Waterous PB18 Series Operation Instructions Manual - page 18
INSPECTION
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.
Oil Seals
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.
Elastomer bellows must
slide over shaft to seat with
stationary ring.
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.
Lubricate shaft or shaft
sleeve before installing
bellows assembly. Use a
water-based lubricant.
Note: On direct mounted
pumps bellows assembly
rides on shaft sleeve.
On geared pumps, the
bellows assemlby rides
on the impeller hub.
Coat inside of bellows before
installing. Use a water-based
lubricant.
Coat O-ring with
oil before installing
in head.
IL2368
Figure 15. Mechanical Seal Installation
Note: If Waterous Mechanical
Seal Lubricant part no. 52608
is not available, P80 rubber
lubricant, straight dish soap
or glycerin may be substi‐
tuted.