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Service And Repair
6. Remove the old UMP by removing the four bolts holding the discharge head as shown in Figure 27. Discard
the old gasket and fasteners.
7. Visually inspect the pigtail connector in the discharge head - replace if damaged. Be certain the indexing tab
of the pigtail is seated in the notch of the discharge head.
8. Pull the pigtail connector in the discharge head out far enough to see the O-ring in the sidewall of its socket
(see Figure 28). 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 Hardware/Seal 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])
9. Place the new gasket from the UMP replacement kit on the new UMP so that all the holes align.
Gaskets from competitive UMPs will not seal properly and performance will be re-
CAUTION
duced.
10. Align the UMP positioning dowel so it inserts in the proper hole in the discharge head (see Figure 28) 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.
Discharge head
Positioning
rjpumps/fig6.eps
Figure 27. UMP Bolts And Gasket
Pigtail female connector/indexing tab is out
of its socket - this is the incorrect position
when attaching the UMP!
Figure 28. 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
32
Replacing the UMP
rjpumps\fig36.eps
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