UMP Replacement Instructions
Replacing the UMP for the Red Jacket STP
10
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 4). 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.
Figure 4. Verifying Pigtail’s Female Connector Is Seated Properly In Discharge Head
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
reduced.
10. Align the UMP positioning dowel so it inserts in the proper hole in the discharge head (see Figure 4) 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.
Fasteners are not metric - use fasteners provided with equipment.
11. Install the four new UMP retaining bolts and lock washers from the UMP replacement kit. Snug and then
torque the bolts using a cross pattern technique to 7 ft-lbs (11 N•m).
Do not use the bolts to pull the UMP into position. Use the cross pattern to snug and
torque the bolts. Do not over torque the bolts. Not following these instructions may
cause parts to fail.
12. Get the three extractable o-ring seals (3.975’’ ID x 0.210’’ wide [upper], 3.850’’ ID x 0.210’’ wide [middle],
and 3.725‘’ x 0.210’’ wide [lower]) from the hardware/seal kit. The three o-rings are very close in size so take
extra care to distinguish each one before replacing them in the extractable. Lubricate each o-ring with
petroleum jelly and then install them in their assigned grooves in the extractable (see Figure 5).
In
s
ert the po
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itioning dowel
on the UMP in thi
s
hole
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il fem
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le connector/indexing t
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when
a
tt
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ching UMP!
Pigt
a
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le connector/indexing
t
ab
i
s
fitted in notch of it
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ocket -
thi
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i
s
the correct po
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ition
b
efore
a
tt
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ching UMP!
Connector'
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o-ring
053-5
CAUTION
WARNING
WARNING