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Service And Repair
Replacing the UMP
25
5.
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
reduced.
Figure 23. UMP Bolts And Gasket
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.
Figure 24. Verifying Pigtail’s Female Connector Is Seated Properly
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
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.
Do not over torque the bolts. Not following instructions may cause parts to fail.
CAUTION
rjpumps/fig6.eps
UMP
Positioning
dowel
Gasket
Discharge head
In
s
ert the po
s
itioning dowel
on the UMP in thi
s
hole
rjp
u
mp
s
\fig
3
6.ep
s
Connector'
s
o-ring
(-015 [0.551'' ID x
0.070'' wide])
Pigt
a
il fem
a
le connector/indexing t
ab
i
s
o
u
t
of it
s
s
ocket - thi
s
i
s
the incorrect po
s
ition
when
a
tt
a
ching the UMP!
Pigt
a
il fem
a
le connector/index-
ing t
ab
i
s
fitted in notch of it
s
s
ocket - thi
s
i
s
the correct
po
s
ition when
a
tt
a
ching the
UMP!
WARNING
WARNING