Pentair MYERS HJ Serie Manual Del Usuario página 17

Maintenance
Figure 14 - Remove Nozzle
9. When replacing nozzle and venturi, be sure they
are tight against the shoulder. Use care to not cross
thread. If nozzle is not fully engaged in case, flow
will be blocked by venturi entrance.
10. Remove 4 bolts holding motor to bracket and
remove motor.
Replacing Mechanical Seal
1. The seal used on all HJ units is 5/8" size.
2. This seal is made in two parts:
a. Rotating assembly, stainless steel spring, drive
ferrule with rubber ring and carbon seal ring.
b. Stationary ceramic seal ring mounted in
synthetic rubber cup.
3. Always replace both rotating assembly and stationary
ceramic seat. DO NOT USE OLD STATIONARY
SEAT WITH NEW ROTATING ASSEMBLY SEAL.
4. Old ceramic ring can be removed from housing
by cracking with a chisel or screwdriver without
removing the pump shaft.
5. Housing and shaft must be clean and free of sand
and dirt before replacing new seal. Wash parts with
clean water.
6. Place stationary ceramic seat into housing. Press in
with fingers only.
7. Place rotating assembly unit on shaft, carbon
ring toward ceramic seat, and press into position
with fingers.
8. Dirt on seal faces can cause failure.
All pumping parts of unit can be removed from case
without disturbing well piping or tank piping.
HR Models
How to Dismantle (HR Deep Well)
1. Disconnect power and drain pressure tank before
dismantling pump.
2. Disconnect the pressure switch tube, remove the
4 cap screws and separate the pump case from the
seal plate.
3. Remove the 3 cap screws holding the diffuser to the
seal plate and remove the diffuser. When replacing
the diffuser, use three .010" thick shims equally
spaced between the impeller eye and diffuser
opening. This centers the diffuser and prevents
impeller rub (Figure 15.)
Figure 15 - Remove Diffuser
4. Remove the impeller by holding the pump shaft with
a screwdriver placed in the slot end of the motor
shaft and rotating the impeller counterclockwise
(Figure 16.)
Figure 16 - Remove Impeller
5. Remove the rotating assembly of the shaft seal.
6. The seal plate may now be removed.
7. The ceramic stationary seal can be driven out using a
3/4" dowel.
How to Dismantle (HR Shallow Well)
1. Disconnect power and drain pressure tank before
dismantling pump.
2. Disconnect the pressure switch tube, remove the
4 cap screws, and separate the pump case from the
seal plate.
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