Service And Repair
Replacing the UMP
26
9.
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 25).
10. Remove the manifold’s female connector’s o-ring (see Figure 25). Get a 0.862’’ ID x 0.103’’ wide o-ring from
the kit and lubricate it with petroleum jelly. Slide the o-ring over the female connector and push it down into its
groove.
11. Reinstall the extractable unit into the manifold and tank. Torque the extractable lock-down nuts in an alternating
pattern to 50 ft-lbs (68 N•m).
12. Turn the air purge screw 2 - 3 turns counterclockwise (see Figure 22).
The air purge screw is retained by a hitch pin to limit travel. Do not attempt to rotate
beyond 3 turns.
13. Turn the pump on and let it run for about 2 minutes to purge air from the manifold’s hydraulic cavities. While
the pump is still running, turn the air purge screw clockwise until it is completely closed.
14. If applicable, open the ball valve down line from the pump.
Figure 25. Locating Packer And Manifold O-Rings
WARNING
Upper extractable o-ring
(-345 [3.975'' ID x 0.210'' wide])
Middle extractable o-ring
(-344 [3.850'' ID x 0.210'' wide])
Lower extractable o-ring
(-343 [3.725'' ID x 0.210'' wide])
Female connector o-ring
(-118 [0.862'' ID x 0.103'' wide])
Contractors box o-rings
(-928 [2.090'' ID x
0.118'' wide])
Extractable wiring compartment cover
o-ring (-928 [2.090'' ID x 0.118'' wide])
2" NPT plug o-ring
(-228 [2.234'' ID x 0.139'' wide])
rjpumps/fig11vsfc.eps