Pentair MYERS HJ Serie Manual Del Usuario página 18

Maintenance
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 16.)
4. On 1/2 HP models, unscrew venturi tube from
impeller. On 3/4 and 1 HP models, venturi tube is
screwed into the pump case (Figure 17.)
Figure 17 - Remove Venturi
5. Remove the impeller by holding the motor shaft with
a screwdriver placed in the slot end of the shaft, and
rotating the impeller counterclockwise.
6. The nozzle on 1/2 HP models can be removed from
pump case with any standard 1-1/4" socket wrench
with an extension (Figure 18). On 3/4 and 1 HP
models the nozzle is part of the pump body. 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.
Figure 18 - Remove Nozzle
7. Remove the rotating assembly of the shaft seal.
8. The seal plate may now be removed.
9. Drive the ceramic stationary seal out with a
3/4" dowel.
Replacing Mechanical Seal
Before handling shaft seal parts, make sure your hands
are clean. Always replace both the ceramic stationary
seal and the rotating assembly.
1. Clean the shaft and seal cavity with water.
2. Lubricate the seal cavity and the rubber cup of the
ceramic stationary seal with soapy water.
3. Press the stationary ceramic seat into housing. Press
in with fingers only.
4. Install seal plate on motor. Take care to not scratch
ceramic seal.
5. Install rotating seal assembly on shaft, carbon ring
toward ceramic seat, and press into position with
fingers. The carbon face should be lubricated with
soapy water.
6. Install the impeller. Tighten with a screwdriver
holding the shaft.
All pumping parts of unit can be removed from case
without disturbing well piping or tank piping.
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