Maintenance; Pump Disassembly - Pentair AERMOTOR VNA Serie Manual Del Usuario

Maintenance

L2
L2
B B
A A
L1
L1
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To avoid electrical
shock hazard, use
insulated-handle
screwdriver to short
capacitor terminals
as shown.
Figure 16: Hold Shaft to Unscrew
Impeller
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Figure 17
Figure 18: Press in Seal
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PUMP DISASSEMBLY

The seal consists primarily of two parts: a rotating member and a floating
seat.
The highly polished and lapped faces of the seal are easily
damaged. Read instructions and handle the seal with care.
Step 1. Be sure disconnect switch is off.
Step 2. Remove wiring from pump.
Step 3. Remove discharge piping to pump.
Step 4. Remove cap screws holding base volute to pump adapter. Piping
to the well need not be disturbed. Lift pump motor and adapter
assembly off base volute.
Step 5. Dismantle pump: Remove canopy, and by holding the centrifu-
gal switch with a wrench, the impeller can be unscrewed off the
pump shaft, exposing the seal (Figure 16). The motor shaft has
right hand threads.
REMOVAL OF OLD SEAL
Step 1. After unscrewing the impeller, carefully remove the rotating part
of the seal by prying up on the sealing washer using two screw-
drivers (Figure 17).
Step 2. Pry loose the floating seat by applying screwdriver between seat
and cavity in casting. Remove rubber seat ring. Clean cavity from
which seal was removed and clean motor shaft.
INSTALLATION OF NEW SEAL
Step 1. Clean polished surface of floating seat with clean cloth.
Step 2. Wet the O-Ring in the ceramic seat with soap solution.
Step 3. Press seat into cavity firmly and squarely, with finger pressure
(Figure 18). If seat will not locate properly, place cardboard wash-
er over polished face of seat and use piece of 3/4" standard pipe
for pressing purposes.
Step 4. Dispose of cardboard washer and again make sure that polished
surface of seat is free of dirt or foreign particles and has not been
scratched or damaged by insertion. Install adapter on motor; be
sure regulator lines up with pressure switch.
Step 5. Inspect shaft to make sure it is clean. Clean face of sealing washer
with clean cloth.
Step 6. Apply soap solution to inside diameter and outer face of rubber
drive ring. Slide seal assembly on shaft (sealing face first), until rub-
ber drive ring slides over shaft shoulder (See Figure 19, Page 12).
Step 7. Screw impeller on shaft until impeller hub hits shaft shoulder. This
will automatically locate seal in place and move the sealing wash-
er face up against floating seat face (Figure 20, Page 12).
Step 8. Reassemble remainder of pump in order of disassembly.
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