Waterous Company
F−2058
Page 5 of 6
INSPECTION
After the pump has been disassembled, check
the following before reassembly:
Impeller Wear
1. Check the wear hubs on the impeller for ex-
cessive wear, or clearance with the wear rings.
If the clearance 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 pump is disassembled, it is advis-
able to install a new mechanical seal during
reassembly, especially if the pump had been in
service for a long period of time.
2. If parts of the seal are to be reused, ex-
amine mating seal faces for severe scratches,
scoring or other damage. If the bellows,spring,
etc., are not in good condition, replace the com-
plete mechanical seal assembly.
3. Check the shaft sleeve in the area under
the mechanical seal bellows to be sure it is free
of severe scratches or other damage. Also
check the impeller hub in the area under the
mechanical seal to be sure it is free from
scratches or other damage.
Oil Seals
Check the impeller shaft and engine crank-
shaft sleeve for signs of severe wear from the
oil seal.
Ball Bearing, Gears, and Needle Bearing
Check for severe wear and replace as neces-
sary.
REASSEMBLY
Direct Mount and Geared Pumps
Reassembly of the pump is basically the re-
verse of disassembly. The following guidelines
will help in reassembly.
1. Check the engine crankshaft for any corro-
sion deposits that will interfere with seating
and sealing of the shaft sleeve.
2. Lubricate all O−rings when installing.
3. The shaft sleeve should seat down tight
against the shoulder of the engine crankshaft.
It may "pop" back slightly on initial installa-
tion, but will seat down tight when the impel-
ler or drive gear is tightened onto the shaft.
4. When installing mechanical seal seat ring,
be careful not to scratch the sealing surface
that contacts the carbon sealing washer.
Direct Mount Pump
1. Lubricate the shaft sleeve with light oil.
Carefully press the seal onto the shaft sleeve.
Be sure there are no burrs on the end of the
sleeve.
2. If new wear rings are used, press them into
the bores carefully so they seat down square at
the bottom of the bore.
3. Replace the sealing washers under the
socket head cap screws that secure the pump
adapter to the engine, if they show signs of be-
ing badly bowed, cracked or corroded.
4. Install the impeller. Make sure it is seating
tight against the shaft sleeve by checking for
any gap where the sleeve seats against the en-
gine crankshaft shoulder. These surfaces
should be tight together with no gap.
5. Complete reassembly of the pump and any
fittings previously removed.
Geared Pump
1. If the oil seals in the gear case are replaced,
be sure that the lip of the seal is pointed toward
the oil.