Jung Pumpen V1d-01 Manual De Instalación Y Del Operario página 7

Maintenance
Main Seal Replacement
1. Follow steps 1 through 4 under "Cleaning the
Impeller".
2. Follow steps 1 through 4 under "Impeller
replacement".
3. lay the pump on its side and remove the oil plug
from the bracket. drain oil into a clean container
and check for water in the oil and for pollutants in
the oil.
NOTICE: Water is heavier than oil. look for water at
the bottom of the oil. It will appear as tiny bubbles.
If there is water present in the oil, the shaft seal or
the o-ring will need to be replaced. If there is no
water present in the oil, the shaft seal and o-ring do
not need replacing.
4. remove the two 8 mm capscrews that hold the
motor housing to the bracket. tap around the parting
line with a lead hammer or rawhide mallet to loosen
the motor housing. remove the motor housing from
the bracket.
5. remove the oil seal and oil seal bushing from the
motor housing.
6. remove the motor housing o-ring and clean the
o-ring groove.
7. remove the seal retaining ring from the motor
housing.
NOTICE: the shaft seal consists of 5 parts - the upper
and lower silicon carbide seals, two rotating silicon
carbide seals, and the spring. Be sure that you do not
scratch or mar the shaft when removing the seals. If the
shaft is marred, it must be dressed smooth with fine
emery or crocus cloth before installing new seal. do
not reduce the shaft diameter.
8. pull and turn the rotating seal halves to remove them
from the motor shaft. If necessary, use a flat blade
screwdriver to help pry the seals from the shaft.
9. unscrew four capscrews and remove the bracket
from the motor housing.
10. use a flat blade screwdriver and very carefully pry
the lower seal half from the cavity.
11. use a flat blade screwdriver and very carefully pry
the upper seal half from the bracket cavity.
For parts or assistance, call Jung Pumpen Customer Service at 1-800-642-5930
Installing the New Shaft Seal
NOTICE: Install all new o-rings, seals, and gaskets
during reassembly. It is good practice to replace the
o-rings each time the pump is serviced.
1. Clean the seal cavities in the bracket and motor
housing.
2. lubricate the seals with a very small amount of
clean oil.
3. Inspect the shaft for nicks and scratches.
4. With finger pressure only, press the stationary seal
halves firmly and squarely into the seal cavities in
the bracket and motor housing.
NOTICE: Be sure you do not scratch the seal surface.
5. reinstall the lower seal retaining ring.
6. reinstall the bracket on the motor. use a new
o-ring. torque 8 mm capscrews to 48 ft-lb (65 nm).
7. slide the rotating seals and the spring onto the shaft.
NOTICE: Be sure you do not scratch the seal surface.
Be careful that the shaft shoulder does not damage
the seal faces when they are passing over the shaft.
Make certain the polished surfaces of the rotating
seals face the mating surfaces of the stationary
seal halves.
8. Clean the o-ring groove in the bracket and install a
new o-ring.
NOTICE: It is good practice to replace the o-rings
each time the pump is serviced.
9. reinstall the volute casing on the bracket. torque
four allen screws to 5.9 ft-lb (8 nm).
10. Grease the shaft cover on the inside. DO NOT use
grease containing graphite
11. assemble all impeller-mounting components and
tighten finger tight.
12. slide impeller over impeller mount.
13. set impeller-to-motor housing gap to .007" (2 mm).
see Figure 6.
14. Block impeller with a piece of wood and torque
central impeller screw to 48 ft-lb (65 nm).
15. attach motor unit to volute casing. torque four allen
screws to 5.9 ft-lb (8 nm).
16. refill pump with specified amount of fresh, clean oil.
do not overfill.
17. position pump vertically and check for free
impeller rotation.
the pump is ready to return to service.
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