Xylem IM023 R03 Model 45HB-70HB Multi-Stage Centrifugal Booster Pump - Manual (Page 3)

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10. Remove motor end-plug to expose slot in end of mo-
tor shaft.
11. Heat shaft sleeve/coupling with a torch by directing a
flame through hole in suction housing (21). This will
break down Loctite
® thread locking compound to
allow removal of the sleeve/coupling. NOTE: Thread
is right-hand. Turn counter-clockwise to loosen.
12. Remove shaft assembly, including rotating portion
of mechanical seal, by holding motor shaft with a
screw-driver in motor shaft slot while turning pump
shaft assembly counter-clockwise with a ½” wrench.
NOTE: Due to the applied heat, the mechanical seal
must be discarded and replaced with a new mechani-
cal seal.
13. Remove bolts holding adapter to motor.
14. Remove suction housing/adapter combination from
motor.
15. Place suction housing/adapter on a flat surface and
push out stationary portion of mechanical seal.
REASSEMBLY
1. Clean all parts, especially pump and motor register
fits, seal seat counter bore in suction housing, and
shaft (in particular where shaft sleeve/coupling fits
against shaft shoulder).
2. Clean shaft sleeve/coupling threads and motor shaft
threads. Clean old Loctite from threads with a wire
brush. Apply Locquic Primer T
® , (Loctite ® Product
No. 74756 available in Automotive Parts and Hard-
ware stores) and allow to dry.
3. Lubricate counterbore of suction housing (21) and
rubber bushing of new stationary seal seat with
light oil or soapy water and press into counterbore
squarely and evenly. CAUTION: Do Not mar or
contaminate the lapped face of the new mechanical
seal seat.
4. With motor in vertical position, remount suction
housing/adapter on motor. Make certain the mo-
tor shaft does not dislocate the new mechanical seal
stationary seat.
5. Apply a thin coat of light oil or soapy water to outer
surface of sleeve/coupling and inside diameter of rub-
ber portion of the new rotating seal member.
6. Slide spring retainer, spring and rotating member of
the new mechanical seal over the sleeve/coupling,
making certain the seal face stays in the holding
collar, and spring retainer is squarely seated against
shoulder of sleeve/coupling. CAUTION: Take care
to prevent damage or dirt on lapped faces of the new
mechanical seal.
7. Coat motor shaft threads with Loctite ® 271.
8. Thread the shaft sleeve/coupling, with rotating por-
tion of mechanical seal in place, onto the threaded
motor shaft until the sleeve/coupling bottoms on the
motor shaft shoulder. Use screwdriver in motor shaft
slot to hold while tightening the shaft assembly with
a ½” wrench.
9. Use a straight edge across face of suction housing to
check location of outboard end of shaft sleeve/cou-
pling. Due to variations in motor shaft lengths and
pump parts, it will be from 0.080” short (below the
straight edge) to flush.
10. If sleeve/coupling is below the straight edge, add
0.010” shims until top face of shims are one (1) shim
higher than straight edge (interferes with straight
edge).
11. Reassemble stages on shaft, checking impeller hub
height after each stage. Hub must be flush with
straight edge or higher. Add 0.010” shims as neces-
sary.
11a. On 10 HP models install bearing spider at half way
point in the stack, use shaft sleeve (13) and shim
accordingly.
12. Install shaft sleeve (4) on shaft.
13. Apply thread sealant (Loctite
® HVV Pipe Sealant) to
suction housing (21) threads plus discharge head (2)
threads and reassemble casing to pump. (Tighten to
50 foot pounds torque.) CAUTION: Do Not apply
sealant to casing threads.
14. Turn pump by hand with a ½” socket over the end
of the pump shaft inside the discharge head (2). Turn
counter-clockwise. Unit should turn with resistance
of only the mechanical shaft seal.
14a. Replace snap ring (1) on shaft.
15. Replace motor end plug.
16. Do not start unit until suction line and pump are
completely filled with water. Refer to OPERATION
Section.
REASSEMBLY