Service And Repair
5. Place the new gasket from the UMP replacement kit on the new UMP so that all the holes align.
CAUTION
Gaskets from competitive UMPs will not seal properly and performance will be
reduced.
6. Pull the pigtail connector in the discharge head out far enough to see the o-ring in the sidewall of its socket
(see Figure 24). Remove the connector's o-ring from the connector's socket and discard it. Get a 0.551" ID x
0.070'' wide o-ring from the kit 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 its index tab is in the socket's notch.
Connector's o-ring
(-015 [0.551'' ID x
0.070'' wide])
7. Align the UMP positioning dowel so it inserts in the proper hole in the discharge head (see Figure 24) and
push the UMP into position using hand force only. The UMP should be snug against the discharge head prior
to installing the UMP retaining bolts.
Use hand force to push the UMP onto the discharge head. If the UMP does not seat
WARNING
snug against the discharge head, remove the UMP and correct the problem.
8. Install the four UMP retaining bolts and lock washers. Snug and then torque the bolts using a cross pattern
technique. Torque to 7 ft-lbs (11 N•m).
Do not use the bolts to pull the UMP into position. Use the cross pattern technique.
WARNING
Do not over torque the bolts. Not following instructions may cause parts to fail.
Discharge head
Positioning
rjpumps/fig6.eps
Figure 23. UMP Bolts And Gasket
Pigtail female connector/indexing tab is out
of its socket - this is the incorrect position
when attaching the UMP!
Figure 24. Verifying Pigtail's Female Connector Is Seated Properly
Gasket
UMP
dowel
Pigtail female connector/index-
ing tab is fitted in notch of its
socket - this is the correct
position when attaching the
UMP!
Insert the positioning dowel
on the UMP in this hole
25
Replacing the UMP
rjpumps\fig36.eps
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