Repair
6. Place the piston (9) flats in a vise and unscrew
the rod (17).
7. Place the preassembled piston seat/guide
assembly (P, items 10, 11, and 12) onto the
piston (9) so the 45 beveled seating surfaces
match.
8. Place the flats of the displacement rod (1) in a
vise. Screw the piston (9) onto the displacement
rod (1) hand tight, then torque to 250–265 ft-lb
(339–359 N•m).
Figure 10
9. Using an adjustable wrench on the flats of the
priming piston rod (17), screw the rod into the
piston (9). Torque to 92–101 ft-lb (125–137 N•m).
Be careful n ot to crea te burrs on the flats of the
rod.
Figure 11
10. If the cylinder (8) was removed from the valve
housing (13), lubricate the seal (6) and place
it on the top of the cylinder. (The cylinder is
symm etrical, so either end can be the top.)
Screw the cylinder into the valve housing.
Figure 12
11. Screw the outlet housing (3) ont o the cylinder.
Torque to 390±45 ft-lbs (528 ± 61 N•m).
12. Lubricate the displacement rod (1). Slide the rod,
piston assembly, and priming piston rod (17) into
the cy linder (10) from the bottom, until the top of
the rod (1) protrudes from the packing nut (2).
Figure 13
13. Lubricate the seal (6) and install it on the bottom
of the cylinder (8).
14. Follow ReplaceIntakeValve,page12,to
assemble the pump.
334127A 15
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