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SEAL ASSEMBLY AND MOTOR REPLACEMENT
ROTARY SEAL ASSEMBLY REPLACEMENT
CAUTION
Make certain that the power supply is
disconnected before attempting to service the unit! The rotary
seal assembly must be handled carefully to avoid damaging
the precision lapped faces of the sealing components.
1. Disengage pump body (Ref. No. 10) from motor mounting ring
(Ref. No. 2).
2. Remove diffuser (Ref. No. 6).
3. To remove the impeller use a 9/16" open end wrench to hold the
motor shaft. On Uni-frame motors, remove the rear cover, the
flat area is located between the governor and rear bearing. On
Nema J motors, the shaft flat area is located in the middle of
the mounting ring. Uni-frame or Nema J motors are indicated
by 56U or 56J respectively in the frame "FR" block on the motor
decal.
4. The rotary seal (Ref. No. 4) will come loose at this time. Use a
screwdriver (or similar instrument) to pry the ceramic seal and
rubber gasket from the recess of the mounting bracket.
CAUTION
Be careful not to damage the motor shaft
or recess surface.
5. Clean the recess and motor shaft thoroughly.
6. Install the new rotary seal assembly.
a. Insert the ceramic seal and the rubber gasket into the recess.
NOTE: To help facilitate installation, apply a drop of liquid soap to
the outside diameter of the rubber gasket. Make certain that the
ceramic seal is kept clean and free of dirt and/or oil.
b. Slip the remaining parts of the rotary seal assembly onto the
motor shaft.
NOTE: Apply a drop of liquid soap to the inside diameter of the
rubber drive ring.
7. Replace the impeller and diffuser removed in Steps 2 & 3.
8. Reassemble the pump body to the motor and mounting bracket.
MOTOR REPLACEMENT (Figure 5)
1. Uni-Frame motors can be replaced in the field with any standard
Nema J jet pump motor by following the instructions below.
CAUTION
Before attempting to replace the motor,
make certain that the power supply is disconnected and the
system pressure is relieved.
2. Remove pump body (Ref. No. 10), diffuser (Ref. No. 6), impeller
(Ref. No. 5), and shaft seal (Ref. No. 4) by following steps 1, 2, 3
& 4 of Rotary Seal Replacement.
3. Uni-Frame motors (indicated by 56U in the frame “FR” block on
the motor decal) can be removed as follows:
a. Disassemble pump base (Ref. No. 14) from unit by removing
two (2) 3/8” hex nuts.
b. Remove four (4) thru bolts from rear of motor and pull away
shell and stator assembly (discard).
c. Disconnect four (4) self tapping screws that hold the bearing
housing to the mounting ring. Discard bearing housing, rotor
assembly and (2) square headed screws.
4. Replace motor with standard Nema J jet pump motor by
positioning motor against the mounting frame and assembling
with four (4) 3/8” x 3/4” cap screws. The mounting base is
connected at the bottom of the mounting frame with two (2) of
the four (4) 3/8” x 3/4” cap screws.
5. Follow steps 5, 6, 7 and 8 of Rotor Seal Assembly to reassemble
the remainder of the pump. Because damage to the shaft seal is
most likely to occur in disassembly, a new seal will be necessary.
NOTE: The pumps and motors require no lubrication. The ball
bearings of the motor have been greased at the factory and under
normal operating conditions should require no further greasing.
