Maintenance - aermotor VNA2 Serie Manual Del Usuario

Maintenance

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Figure 16
Figure 17
Figure 18
Figure 19
Figure 20
PUMP DISASSEMBLY/ASSEMBLY
Step 1. Turn off power at disconnect switch. Disconnect power lines from
pressure switch.
Step 2. Remove the two cap screws holding the pump to the flange adapt-
er. Don't disturb the piping in the well.
Step 3. Remove the adapter flange gasket and scrape the surfaces clean.
Step 4. Unscrew and remove the straight barbed fitting at the pressure
switch.
Step 5. Draw a line down the side of the pump with a marker to help
alignment during reassembly. Mark the pump from the motor to
the base volute (see Figure 16).
Step 6. Turn the pump upside down on the bench and block it. Remove
the four cap screws from the base. With a mallet, tap upward on
the base to loosen it. Lift the base off of the intermediate volute
(see Figure 17).
Step 7. To reduce the chance of dropping the pump onto your foot, lay it
down on the bench; block it so it won't roll.
Step 8. Hold the motor shaft with pliers or vice grips through the opening
in the pump adapter. Unscrew the impeller nut off the end of the
shaft (see Figure 18).
Step 9. The impellers are keyed to the shaft and do not unscrew. Insert
two screw drivers on opposite sides under the exposed impeller
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and pry the impeller off (Figure 19) to remove it.
Step 10. Carefully tap a small screwdriver or thin bladed chisel in between
the intermediate volute and the pump adapter in two or three
places around the pump to separate the castings (Figure 20). Do
not mar the seal ing surfaces; do not break pieces out of the adapt-
er or volute – the castings are easily damaged.
Step 11. Remove the intermediate volute and slide the impeller spacer off
of the shaft.
Step 12. Remove the impeller. Don't disturb the shaft keys if you are only
replacing the seal.
Step 13. Rotate the seal spring retainer cup so that the slot lines up with
the shaft keys; remove the cup and spring.
Step 14. Remove the two cap screws holding the adapter bracket to the
motor.
Step 15. With two screwdrivers on opposite sides of the pump, carefully pry
the pump adapter away from the motor. This will pull the seal off
of the motor shaft. Use caution to make sure that the ceramic seal
does not dig into the shaft and scratch the shaft's sealing surface.
INSTALLATION OF NEW SEAL
Step 1. Clean all gasket surfaces thoroughly before reassembly. Clean the
seal bore cavity in the pump adapter.
Step 2. Wet the rubber seat ring with soapy water and push the stationary
part of the seal into the seal bore cavity. Use a piece of 1" pipe
pressing on a cardboard washer (to prevent damaging seal surface)
as a press. Make sure that the seal half is fully seated in the seal
bore cavity. Remove the cardboard once the seal is in place.
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