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SHURflo Operating Instructions, Performance,
Specifications and Parts Manual
®
Noryl
Series and Polypropylene Series
Maintenance
Make certain
that the unit is
disconnected from the power source
before attempting to service or remove
any components!
REMOVAL OF OLD SEAL ASSEMBLY
Should the mechanical seal (Ref. No. 5)
require repair, proceed as follows and
refer to Figures No. 5 - 7.
IMPORTANT: Always replace both the
seal seat and seal as an assembly to
ensure proper mating of components!
1. Remove bolts (Ref. No. 8) connecting
the pump housing casing (Ref. No. 2)
to the body adapter (Ref. No. 1).
2. Remove the pump housing casing
(Ref. No. 2).
Care should be taken
not to pinch or "shave"
the O-ring gasket (Ref. No. 6) between the
body adapter and the housing casing.
3. Remove the impeller (Ref. No. 4)
from the shaft by unscrewing it
counterclockwise as viewed from
the pedestal pump face.
NOTE: Pump shaft must be held in
place to remove impeller. Impeller (Ref.
No. 4) unscrews CCW when looking
at the front of the pump.
4. The ceramic seat is located on the
back side of the impeller (part of
Ref. No. 5). Pry the seat out by
using a screwdriver in the inside
hole (see Figure 5). Be careful not
to damage or scratch the inside
surfaces of the bore holding the
seat. Such scratches can cause
leaks. Replace the impeller if such
damage occurs.
Form L-4074 (12/09)
5. Remove the body adapter (Ref. No.
1) from the pedestal by removing
the adapter bolts.
6. Use a wooden dowel to push out
the mechanical seal (part of Ref.
No. 5) from the body adapter (Ref.
No. 1). (See Figure 5.) Do not dig
the seal out from the front.
INSTALLATION OF NEW SEAL
ASSEMBLY
The precision
carbon/ceramic faces
on the mechanical seal are easily damaged.
Handle your repair seal carefully. Do not
touch the carbon/ceramic seal faces.
IMPORTANT: Be sure that shaft
shoulder does not damage carbon face.
1. Thoroughly clean all surfaces of the
seal cavity in body adapter (Ref. No. 1).
2. Replace the o-ring inside the cavity
(Ref. No. 11). Using seal installation
tool (see Figure 6), press in new
mechanical seal being careful not
to scratch the polished carbon face.
3. Wet the rubber portion of the new
seal seat (part of Ref. No. 5) with a
light coating of soapy water. While
wearing clean gloves or using a
clean light rag, press seal seat
squarely into impeller recess. Use
the cardboard washer (usually sup-
plied with new seal) to place over
the polished ceramic surface and
use a piece of pipe or dowel rod to
press in firmly but gently (see Figure
5). Avoid scratching the ceramic
face, usually white.
7
4. Dispose of cardboard washer. Check
again to see that ceramic surface is
free of dirt and all other foreign
particles and that it has not been
scratched or damaged.
5. Install the body adapter (Ref.
No. 1) to the pedestal using bolts.
Be careful not to damage the seal
when sliding over the shaft.
6. While preventing the shaft from
turning, screw impeller (Ref.
No. 4) onto shaft and tighten
(see Figure 5).
NOTE: A short "run-in" period may be
necessary to provide completely
leakproof seal operation.
This completes the seal installation.
7. Check if shaft turns freely by spin-
ning impeller. If rubbing or binding
is found, remove impeller.
8. Place o-ring (Ref. No. 6) into groove
on back side of housing. It may be
necessary to temporarily hold the
o-ring in the groove with grease.
Seal assembly will
produce minor drag
when spinning shaft, but rubbing any-
where else must be eliminated! Otherwise,
damage to pump and/or motor may occur.
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