Pentair MYERS HJ Serie Manual Del Usuario página 16

Maintenance
Risk of electric shock. Can shock, burn or
kill. To guard against accidental personal injury, the
electric power to the pump should be turned off and the
pressure tank drained before servicing pump.
HJ and HJA Models
How to Dismantle (HJ Deep Well)
1. Disconnect power and drain pressure tank before
dismantling pump.
2. Disconnect pressure switch tube, remove pump case
bolts and bracket foot bolts.
3. Use heavy screwdriver behind bolt ears and pry
motor bracket from case.
4. Remove diffuser plate bolts and take off diffuser
(Figure 10). When replacing diffuser, use three .010"
thick shims equally spaced between impeller eye
and diffuser to prevent impeller rubbing diffuser
and binding.
Figure 10 - Remove Diffuser Plate
5. Remove impeller by holding pump shaft with water
pump pliers and unscrewing impeller – left-hand
counterclockwise facing the impeller to remove
(Figure 11.) Impeller can also be removed by prying
out motor shaft end cap. Use a screwdriver in slot
in end of shaft or a 7/16" open end wrench on shaft
flats and hold to prevent shaft rotation. Unscrew
impeller counterclockwise.
Figure 11 - Remove Impeller
6. Using two screwdrivers, as shown in Figure 12, pry
out rotating assembly of shaft seal.
Figure 12 - Pry Out Seal
7. Pump shaft is extension of motor shaft so it is not
necessary to replace or adjust for seal position.
8. Remove 4 bolts holding motor to bracket and
remove motor.
How to Dismantle (HJ Shallow Well)
1. Disconnect power and drain pressure tank before
dismantling pump.
2. Remove case bolts and pry bracket from pump case.
3. Remove screen and plastic diffuser plate. When
replacing diffuser, use three .010" thick shims
equally spaced between impeller eye and diffuser to
prevent impeller rubbing diffuser and bindings.
4. On 1/2 HP models, hold impeller with pliers and
unscrew venturi tube. On 3/4 and 1 HP models,
venturi tube is screwed into the pump case
(Figure 13.)
Figure 13 - Remove Venturi
5. Hold pump shaft with pliers and unscrew impeller as
shown (Figure 11.)
6. When replacing impeller, file any plier cuts on shaft
smooth after tightening in place.
7. Priming screen must be placed with dimple down.
THIS IS IMPORTANT FOR PROPER PRIMING. DO
NOT LEAVE THIS SCREEN OFF.
8. Nozzle on 1/2 HP models can be removed from
pump case with any standard 1-1/4" socket wrench
with an extension (Figure 14).
On 3/4 and 1 HP models venturi tube and nozzle
can be removed in same manner using 27/32" socket
for the venturi and 9/16" socket with extension
for nozzle.
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