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CAUTION
To avoid costly damage to the pump, follow this
service procedure carefully. Do not attempt to repair
anything that is not mentioned in this service section.
Before you start
Special tools needed for repairing the pump are men-
tioned in the text and described in the Accessories
section on page 26. Be sure you have all the neces-
sary tools and repair parts on hand.
Pump Thrust Bearing and Seal
Replacement
NOTE: It is not necessary to remove the pump from
the standpipe. However, if you are also repairing the
lower pump, you can install the shaft holding tool and
move the pump to the repair stand at this time. Use
the tool indicated in Fig. 4.
NOTE: Replace the pump thrust bearing (A) assembly
at least once a year. Replace the assembly if the pump
housing temperature goes over 150_F (53_C), which is
the first sign of bearing failure.
Disassembly
(Refer to Fig. 5, except where indicated)
1. Shut off the power to the pump. Close the check
valve (J) and/or the line isolation valves (Q).
Remove the motor. Refer to Installing the Motor
on page 6.
2. Remove the slinger chamber screws, cover and
gasket (3, 21, 20). Inspect the chamber opening
and clean out any residue.
3. Remove the retainer plate (58c) and rubber cou-
pling insert (6) from the pump coupling assembly
(58). Loosen the slinger (40) setscrew.
4. Hold the pump coupler (58) and screw the shaft
nut (28) off the shaft (33), using a socket wrench.
5. Remove the screws, washers and springs (10, 11,
25) and lift out the coupling assembly (58).
6. Remove the bearing support (22) and key (58b)
from the shaft (33).
7. Remove the adjusting nut lockscrew and plug (19,
27). Then remove the adjusting nut (35).
12
308060
Service
Shaft Holding
1
Tool 218634
(for standard pumps)
Shaft Holding
2
Tool 207727
(for high-profile
pumps)
Fig. 4
8. Remove the three screws (13) and shaft seal
assembly (41).
NOTE: To service the lower pump section, refer to
page 15. Otherwise, continue with Step 9.
9. If the pump is mounted in a repair stand, install the
shaft holding tool. See Fig. 4.
10. Install the shaft seal assembly (41) with the three
screws (13).
11. Replace the shaft seal (8) in the adjusting nut (35).
Install the adjusting nut, engaging just one thread
in the pump base (31).
12. Position the bearing support (22) on the adjusting
nut (35) so its pin (P) and the slot in the support
align.
13. Screw the adjusting nut (35) down just until the
bearing support (22) bottoms out on the housing.
Turn the nut back 1 to 1-1/2 turns to engage
bearing support.
14. Slide the coupling assembly (58) over the shaft
(33).
15. Align the keyway and insert the key (58b) between
the coupling assembly and shaft.
16. Use the special tool, 178779, to check the shaft
location dimension. Place the tool on the face of
the coupler (58), between the coupler tabs as
shown in the detail of Fig. 6. The tabbed portion of
the tool should touch the top of the shaft (33).
Screw the adjusting nut (35) up until you attain the
0.25 in. (6.3 mm) dimension.
17. Install the shaft nut (28) using a socket wrench
and bottom it on the coupling assembly (58).
18. Align the hex of the nut retainer plate (58c) with
the shaft nut (28) and secure the lockwire (58d).
36a
36b
1
2
03123
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