Service and Repair
Procedure for Removal of Plug-in Type Pump - Motor Assembly
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Procedure for Removal of Plug-in Type Pump - Motor Assembly
Not all installed pump/motor units will have a locknut securing the pump shell. Steps 3A and
11 can be skipped if no locknut is present.
The UMP (Unitized-Motor-Pump) contains no serviceable parts (other than the foot valve)
and should not be modified or adjusted.
1. Place pump in a horizontal position on a clean surface.
2. Block up under the 3-inch column pipe so that the pump/motor assembly is about 2 inches above supporting
surface.
3A. If a locknut is present; loosen setscrew in locknut. Unscrew the locknut from the discharge head. Slide the
adapter tube up to expose the four hex head machine bolts.
3B. Loosen and remove the four hex head machine bolts on the top of the pumping unit just above the shell and
around the motor.
4. Do not let the pump roll. Using your hands, (do not use a wrench) hold pump at the extreme bottom end and
use a slight up and down motion to pull the pump from the casting attached to the 3-inch pipe.
Up and down motion to remove the pump unit should not be greater than 1/4 inch. Motion
greater than 1/4 inch could damage a positioning dowel pin in the top of the motor.
5. If the motor leads tend to stay plugged into the motor, finish removing the motor until the leads can be pulled
out of the top of the motor by hand (this is a “plug in” type connection). Verify the number of wires. If there are
only three wires, the pigtail and conduit seal must be replaced with the proper 5-wire version.
Installed pump/motor units with 3-wire pigtails must be upgraded to the proper 5-wire
pigtail and conduit seal assemblies.
6. Pull the pigtail connector in the discharge head out far enough to see the o-ring in the sidewall of its socket.
Remove the connector’s o-ring from the connector’s socket and discard it. Get a 1.234” ID x 0.139” (-218 P/
N 072-712-1) wide o-ring and lubricate it with petroleum jelly. Slide the new o-ring over the pigtail connector
and push it in the groove in the wall of the connector’s socket. Lubricate the pigtail connector body with
petroleum jelly and push it back into its socket, making sure the index tab is in the socket’s notch.
7. Remove the block from the top of the new pump-motor assembly.
8. Look at bottom of the discharge head casting which remains screwed to the 3-inch pipe. Note the position of
the one hex head bolt and mechanical interlocking dowel pin. Place the four machine bolts through the four
bolt holes.
One hole (180 degrees away from the hex head) remains open, this is the locating pin hole.
9. Find the locating pin on top of the motor. This pin must go into the remaining open hole referred to in notice
following Step 8.
10. Place the new pump/motor assembly in position by starting the locating pin into the hole referred to above.
The mechanical interlocking dowel pin will engage into a recessed cavity in the motor first. Gently push the
motor into place until the shell starts to pass over the large ‘O’ ring. Position the four machine bolts into the
bolt holes and start threads. Draw all bolts down evenly until all are snug. After all bolts are snug, torque bolts
to 24-34 ft-lbs (32-46 N•m).
Draw all bolts down evenly until all are snug. This will help avoid damaging the connector and dowel pin.
11. If a locknut is present; slide the adapter tube down over the discharge head so that it sets against the shell.
Thread the locknut onto the discharge head and tighten until the adapter tube is firmly held in place against
the pump shell. Torque the locknut to 55-75 ft-lbs (75-102 N•m). Torque the setscrew in the locknut to 25-50
in-lbs (2.8-5.6 N•m).
Содержание Maxxum Big-Flo 6
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