Maintenance
20
3A4586E
Reassemble After Cleaning
NOTE: Any damaged parts must be replaced as they
could harbor microorganisms that can contaminate the
fluid.
NOTE: Lubricate the o-rings and threaded fittings with
appropriate waterproof sanitary lubricant during assem-
bly.
1.
Replace damaged seals or o-rings, as necessary.
Use food grade lubricant on o-rings.
2.
Reinstall mechanical seal bushing (206) into gear
reducer (205).
3.
Replace upper o-ring (207a), upper seal (207b),
lower seal (207c), noting orientation between both
seals, lower o-ring (207d), washer (207e), spring
(207f) ensuring hook in spring lines up with lower
seal housing hole, washer (207e), and gasket (208).
4.
Install the female end of the drive shaft (209) into
the gear reducer (205), use a rigid rod through the
gear reducer observation hole, and tighten the drive
shaft hand tight,
5.
Install the gasket (212) and outer tube (217) over
the drive shaft assembly.
6.
When the gasket (212) and the flange of the outer
tube (217) meet the bushing (206), the internal drive
shaft assembly is properly inserted and the outer
tube hex nut can be tightened. Use a large wrench
to tighten the hex nut. Tighten the set screw (213).
7.
Install the gasket (210) to the male end of the drive
shaft before threading the rotor. Tighten hand tight.
NOTE: Food grade lubricant may be used on the
stator to aid insertion into the stator tube.
8.
While aligning the alignment tab on the stator tube
(220 or 221) and the recess on the stator (219),
insert the stator into the threaded end of the stator
tube.
9.
Install the ring (218) and stator tube onto the outer
tube (217). Tighten hand-tight.
NOTE: The threads are reverse direction. Tighten
by rotating the stator tube in a counter-clockwise
direction.
10. Attach the motor:
a.
For 25C420, 25C421, 25C780, or 25C781
pumps, position the motor over the coupler
(202) and tighten the nut (203) hand tight.
NOTE: In the next step, attach the motor for the
25C422 or 25C782 while it is resting on a hori-
zontal surface. Do not attempt to assemble in a
vertical orientation.
b.
For 25C422 or 25C782 pump, align the coupler,
motor, motor hanger, and motor mount flange.
Use two longer bolts to loosely attach the motor
hanger and motor mount flange to two holes on
the motor. Using the four shorter bolts, loosely
attach the motor mount flange to the motor.
After all bolts are inserted, tighten using a
crossing pattern until all bolts are tight. Torque
to 30-36 ft-lb (41-49 N-m).
11. When installing pump into container, attach the
ground wire to the lower unit as specified in
Grounding on page 6.
