F−2058
Page 4 of 6
Waterous Company
PUMP REPAIR AND OVERHAUL
Refer to Service Parts List provided with Por-
table Pump packet.
The following instructions describe the proce-
dures for removing and installing wear rings,
impeller,mechanical seal, and other parts.
Pump Disassembly
1. Disconnect any suction and discharge pip-
ing. It is not necessary to remove suction or
discharge adapters, or discharge valve.
2. Disconnect the copper tube attached to the
priming line petcock at the suction inlet of the
pump.
Direct Mounted Pump
1. Remove (4) cap screws from the engine side
of the pump volute body. Slide the volute body
off the adapter attached to the engine.
2. Remove the socket head cap screw and
washer holding the impeller to the engine
crankshaft. If the impeller does not pull off the
crankshaft easily, 1/4−20 puller holes are pro-
vided in the impeller to assist in removal. Be
sure to protect the tapped hole in the shaft
when using any type of puller. Remove the im-
peller key.
3. Remove the mechanical seal rotating
parts. The stationary seal ring will remain in
the pump adapter.
4. Remove the (4) socket head cap screws and
washers holding the pump adapter to the en-
gine. Remove the pump adapter. Press out the
mechanical seal stationary seal ring.
5. If water has been leaking past the shift
sleeve, the O−ring seal should be replaced. Re-
move the sleeve. If it is difficult to remove, a
"vice−grip" or "channel−lock" type tool may be
used but only if the end next to the engine is
gripped. Do not mar the surface under the me-
chanical seal bellows.
Geared Pump
1. Remove bolts, nut and lock−washers from
the volute body. Slide the volute body off the
adapter attached to the gear case.
2. Remove the 1/2−20 lock nut from the impel-
ler shaft. If the impeller does not pull off the
impeller shaft easily, use a gear puller or two
screw drivers between the impeller and adapt-
er. Remove the impeller key. The mechanical
seal rotating parts will come off with the impel-
ler. The stationary seal ring will remain with
the adapter.
3. Drain oil from gear case.
4. Remove the 10 hex head screws from the
gear case cover.
5. Remove the cover adapter from the gear
case. Press out the impeller shaft and bearing
assembly from the cover adapter. Press out the
mechanical seal stationary seal ring and the
oil seal.
6. The impeller shaft assembly with the ball
bearing, pinion gear, spacer, needle bearing in-
ner race and snap ring should not require dis-
assembly unless inspection reveals wear of the
ball bearing, needle bearing race or pinion
gear. Drive the roll pin out of the gear. Using
a suitable sleeve, press the bearing and the
gear off the gear end of the shaft. Remove the
snap ring from the end of the impeller shaft
and slide the needle bearing inner race off. If
the bronze spacer is deformed, it may have to
be machined off.
7. Remove the socket head cap screw and
washer holding the drive gear to the engine
crankshaft. If the gear does not pull off the
shaft easily, use a gear puller taking care to
protect the tapped hole in the shaft. Remove
the key.
8. Remove the (4) socket head cap screws and
washers holding the gear case to the engine.
Remove the gear case. Press out the shaft seal
if necessary. The impeller shaft needle bearing
cannot be removed without destroying it; use
your judgement.
9. If oil has been leaking past the shaft sleeve,
the O−ring seal should be replaced. Remove
the sleeve. If it is difficult to remove a "vice−
grip" or "channel−lock" type tool may be used
but grip the shaft end near the gear. Do not
mar the sleeve surface under the seal.
10. Clean the magnetic drain plug and check
to be sure the breather is not plugged.
