Maintenance (Continued)
IMPORTANT: Stainless steel
components deform easily, be careful to
avoid damaging pump components
during disassembly.
6. Unscrew Hex Nut (Ref. No. 37) from
pump Shaft in a counter-clockwise
direction and remove along with
Sleeve Cup (Ref. No. 35).
7. Lift Volute (if still present) and
Impeller (Ref. No. 26) from stack
and set aside.
IMPORTANT: Take note of sequence
parts are arranged in and direction they
are facing, number and mark if
necessary (see Figure 6 & 7).
8. Lift next Volute/Crossover (Ref.
No. 34), Inner Bearing (Ref. No. 32),
and Impeller from stack.
NOTE: Inspect Inner and Outer Bearings
for wear. If grooves can be seen or felt,
replace both bearings as a set.
9. Use a large straight blade
screwdriver to carefully pry Cap (Ref.
No. 28) from Crossover to free Wear
Ring (Ref. No. 29).
NOTE: Inspect for wear by placing Wear
Ring over nose of Impeller and noting
clearance between two diameters. If fit
is not snug, replace Wear Ring.
10. Repeat Steps 7 and& 8 for each
stage (some stages have no
bearings).
NOTE: Inspect Shaft (Ref. No. 21) for
grooves, replace if splines are worn.
11. Lift Cylinder (Ref. No. 20) from
Casing (Ref. No. 39), use a soft
mallet to break loose if necessary.
NOTE: Inspect o-ring groove in Casing
after o-ring is removed. Rust/pitting in
this region may cause leaks, be sure to
clean or replace Casing entirely if
damage is excessive.
12. If stage-1 Volute (Ref. No. 38)
remains in Casing, now is the time to
remove it. Gently pry loose with a
straight blade screwdriver, being
careful to avoid bending it.
13. Unscrew 2 fasteners (Ref. No. 42).
14. Use a straight blade screwdriver to
pry pipe Flange (Ref. No. 41) loose.
15. Use a putty knife to scrape off old
Gasket (Ref. No. 40) from Flange
and Casing.
REASSEMBLY
1. Always use new Gaskets (Ref.
No. 40) when reassembling. Attach
pipe Flanges (Ref. No. 41) with
Fasteners (Ref. No. 42). Tighten
evenly and torque to 33 ft-lbs
[45 N-m].
2. Place new O-ring (Ref. No. 19) into
cleaned groove of Casing (Ref.
No. 39), be sure to lubricate with
soapy water or suitable material.
3. Place stage-1 Volute (Ref. No. 38)
back into Casing (Ref. No. 39)
making sure it is seated properly.
4. Carefully guide Cylinder (Ref. No. 20)
back into Casing and press down.
IMPORTANT: If Cylinder does not fully
seat, O-ring may be pinched. If this
occurs, lift Cylinder back out and try
stretching O-ring. Be sure components
are adequately lubricated and have not
been damaged. Repeat process until end
of Cylinder bottoms on Casing.
5. Reassemble Impellers (Ref. No 26),
Crossovers (Ref. No. 34), etc. onto
pump Shaft (Ref. No. 21) in same
order they were removed (see
Figure 6 & 7) and torque Hex Nut
w/Nyloc (Ref. No. 37) to 13 ft-lbs
[18 N-m].
IMPORTANT: NEVER reuse Hex Nut
w/Nyloc, ALWAYS replace with new
unused one.
6. Take Impeller/Crossover stack by
Shaft and lower into pump until
properly seated.
7. Place new O-ring (Ref. No. 19) into
cleaned groove of Adapter (Ref.
No. 8), be sure to lubricate with
soapy water or suitable material.
8. Install wave Spring (Ref. No. 18)
with ends pointed towards Adapter.
With wave Spring seated on proper
landing in Adapter, carefully guide
Adapter onto pump and press down.
IMPORTANT: If Adapter does not fully
seat, O-ring may be pinched. If this
occurs, lift Cylinder back out and try
stretching O-ring. Be sure components
are adequately lubricated and have not
been damaged. Repeat process until
Adapter bottoms on end of Cylinder.
9. Reinstall Fasteners (Ref. Nos. 15
& 16) onto Staybolts (Ref. No. 17)
and tighten diagonally.
10. Proceed to Reassembly portion of
Shaft Seal Replacement.
11
Specifications Information and Repair Parts
Manual
Models PM1, PM3, and PM5
