Page 14 of 14
10. Insert the impeller shaft assembly in the gear case
cover. Be sure the inner race is on the shaft end, ta
‐
pered end facing out.
11. Using a new gasket, place the gear case cover on the
gear case and replace the ten hex head screws and
lock washers.
Note: It is very important to keep the mechanical
seal sealing surfaces clean and scratch free. Any
dirt, oil, or scoring can cause immediate failure or
premature wear.
E501 Pumps Only (Steps 12-16):
(See Figure 11)
Note: The bellows assembly fits tight on the im
‐
peller hub. This tight fit is necessary for the seal to
withstand the high pressures this pump creates.
Use plenty of mechanical seal lubricant and
push bellows assembly onto impeller hub using
a slight twisting motion to ease installation.
Note: If Waterous Mechanical Seal Lubricant part
no. 52608 is not available, P80 rubber lubricant,
straight dish soap or glycerin may be substituted.
12. Install the impeller gasket.
13. Coat the impeller hub and inside diameter of the bel
‐
lows assembly with mechanical seal lubricant. Install
bellows assembly onto impeller hub with the primary
ring facing away from the impeller. Make sure the pri
‐
mary ring stays in its retainer (use a small amount of
grease on the backside of the primary ring as needed
to keep the ring in place).
14. Clean the sealing surface of mechanical seal primary
ring with soft cloth and denatured alcohol.
15. Place key in shaft keyway and install the impeller onto
the shaft.
INSPECTION
E511 Pumps Only (Steps 17-20):
(See Figure 12)
Note: If Waterous Mechanical Seal Lubricant part
no. 52608 is not available, P80 rubber lubricant,
straight dish soap or glycerin may be substituted.
16. Coat the impeller shaft and inside diameter of the bel
‐
lows assembly with mechanical seal lubricant. Make
sure the primary ring stays in its retainer (use a small
amount of grease on the backside of the primary ring
as needed to keep the ring in place). Clean the seal
‐
ing surface of mechanical seal primary ring with soft
cloth and denatured alcohol. Install the bellows as
‐
sembly, seal spring and spring collar onto the impeller
shaft with primary ring facing the stationary ring. Push
assembly evenly, using collar until primary ring con
‐
tacts the stationary ring.
17. Install new retaining ring. Do not reuse the old retain
‐
ing ring.
Note: Retaining ring material may be different
from original.
18. Install the impeller key in shaft keyway and install the
impeller onto the shaft.
19. Install the Nord-Lock
®
washer (see Detail A on Fig
‐
ure 11) and nut. Torque nut to 70 ft-lbs. maximum.
20. Press new wear ring into the volute carefully so that it
seats squarely in the bottom of the bore.
21. Place the volute over the lubricated O-ring of the gear
case cover and replace the fasteners to secure.
22. Complete reassembly of the pump and any fittings
previously removed.
Testing
1. Before testing the pump, rotate the engine crankshaft
as outlined in the
“Preparation Before Operation” sec
‐
tion. Be sure there are no abnormal rubbing noises.
2. The mechanical seal may leak when the pump is first
run after it has been repaired. This leakage should
stop after the seal faces run-in.
3. With the pump running, check for unusual noises or
leaks at volute joints, pump adapter/gear case engine
screws, or gear case / engine adapter interface.
These should be corrected before the pump is re
‐
turned to service.
