OM-07089
S SERIES PUMPS
PAGE E - 11
MAINTENANCE AND REPAIR
Second Stage Diffuser and Wear Ring Removal
(Figure E-1 & E-2)
Disengage the hardware (14 and 15) and separate
the second stage diffuser (23) and gaskets (19 and
20) from the seal plate (52) and intermediate (47).
Inspect the wear ring (11) for excessive wear or
scoring. If replacement is required, use a small bit
to drill two holes horizontally through the wear ring,
180
apart. Use a chisel to complete the cuts
through the wear ring, and remove it from the sec
ond stage diffuser.
Be careful
not to damage the
diffuser bore.
Second Stage Impeller Removal
(Figure E-1)
A tool for removing the lock nut (18) may be fabri
cated as shown in Figure E-5.
2 PIECES OF 0.25” SQUARE X 1.5” LONG KEYSTOCK
- POSITION 180
APART AND WELD
5.0”
0.5”
MAKE FROM STANDARD 2.75” O.D. 16 GA. TUBING
Figure E-5. Impeller Locknut Tool
Wedge a steel rod between the vanes of the impel
ler (7) and one of the studs (34) to prevent shaft ro
tation. Straighten the taps on the impeller lock
washer (12), and position the locknut removal tool
over the shaft so the keystock engages the slots in
the locknut. Use a pipe wrench to turn the tool and
remove the locknut and washer.
Remove the rod from the impeller vanes, and install
two 3/8-16 UNC by 2-inch long capscrews in the
tapped holes in the impeller, and use a suitable
puller to remove the impeller from the shaft. Use
caution when removing the impeller; tension on
the seal spring will be released. Retain the impeller
key (42).
Lower Seal Removal
(Figures E-2 and E-6)
Carefully remove the seal spring. Lubricate the ro
tor shaft (40) and work oil under the bellows as
sembly. Slide the hooked ends of two stiff wires
along the shaft and pull the rotating portion of the
seal from the shaft.
To remove the stationary portion of the seal, re
move the socket head capscrews (10), and slide
the seal plate (52) from the shaft. Remove and dis
card the seal plate O‐ring (51). Place a
clean
cloth
on a flat surface and place the seal plate on the
cloth with the impeller side down. Use a drift pin or
screwdriver to press on alternate sides of the sta
tionary seat until the stationary element and seat
are removed.
NOTE
Use caution not to damage the moisture detector
(36) after the seal plate is removed.
If no further disassembly is required, proceed to
the appropriate areas in
PUMP END REASSEMB
LY
.
Upper Seal Removal
(Figures E-1 and E-6)
Unless cracked or otherwise worn, it is not neces
sary to remove the intermediate (47) for access to
the upper seal assembly (50).
If the intermediate must be removed, see
the procedure under
Motor Disassembly
in this section.
Do not
attempt to loosen
the hardware (14, 15, 48, 49 and 69) secur
ing the intermediate or bearing cap (44)
before referring to this section; otherwise,
the rotor shaft and bearings could be dam
aged.
Remove the seal retaining ring (31) using snap ring
pliers. Use caution when removing the retaining
ring; tension on the seal spring will be released.
Remove the spring retainer and seal spring.
