Maintenance; Pump Service - Pentair STA-RITE J Serie Manual De Instalación Y Operación

MAINTENANCE

PUMP SERVICE

This centrifugal pump requires little or no service other than
reasonable care and periodic cleaning. Follow the procedure
outlined below for shaft seal replacement.
NOTICE: Pumps use mechanical seals with a rubber seat
ring or a sealing O-Ring. THESE SEALS ARE COMPLETELY
INTERCHANGEABLE.
NOTICE: The highly polished and lapped faces of this seal
are easily damaged. Read instructions and handle the seal
with care.
Some models are equipped with an impeller screw, which has a
left-hand thread. Before unscrewing the impeller, remove the
impeller screw.
REMOVAL OF OLD SEAL
1. After unscrewing impeller, carefully remove rotating part of
seal by prying up on sealing washer, using two screwdrivers
(see Figure 5-A shown below). Use care not to scratch
motor shaft.
2. Remove seal plate from motor and place on flat surface,
face down. Use a screwdriver to push ceramic seat out
from seal cavity (see Figure 5-B shown below).
Mechanical seal
rotating half
A-Seal removal-rotating half
S873 (08-01-20)
Mechanical seal
stationary half
Seal Plate
B-Seal removal-stationary half
Figure 5: Seal Service
Installation of Floating Seat
(See Figure 5-C shown below)
1. Clean polished surface of floating seat with clean cloth.
2. Turn seal plate over so seal cavity is up, clean
cavity thoroughly.
3. Lubricate outside rubber surface of ceramic seat with
soapy water and press firmly into seal cavity with finger
pressure. If seat will not locate properly in this manner,
place cardboard washer over polished face of seat and
press into seal cavity using a 3/4" socket or 3/4" piece of
standard pipe.
4. Dispose of cardboard washer. Be sure polished surface
of seat is free of dirt and has not been damaged by
insertion. Remove excess soapy water.
Installation of Rotating Part of Seal Unit
(See Figure 5-D shown below)
1. Reinstall seal plate using extreme caution not to hit
ceramic portion of seal on motor shaft.
2. Inspect shaft to make sure that it is clean.
3. Clean face of sealing washer with clean cloth.
4. Lubricate inside diameter and outer face of rubber drive
ring with soapy water and slide assembly on motor shaft
(sealing face first) until rubber drive ring hits shaft shoulder.
5. Screw impeller on shaft until impeller hub hits shaft
shoulder. This will automatically locate seal in place and
move the sealing washer face up against seat facing.
Reinstall impeller screw (if used).
3/4" socket
or pipe
Cardboard
washer
(supplied w/seal)
Polished
surface
Rubber
surface
C-Stationary half installation
Shaft
shoulder
Rubber drive
ring
Sealing
face
Impeller
D-Rotating half installation
5939 0109
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