Service
12 310643U
18. Slide piston assembly into bottom of sleeve. Make
sure V-packing and u-cup are not rolled over or
damaged. Mark IV models: Install o-ring (231) on
sleeve spacer (230). Install sleeve spacer on
sleeve.
19. Grease top inch or two of piston rod that will go
through the cylinder throat packings.
20. Grease o-ring (221) and place on sleeve. Slide
sleeve/piston rod assembly into bottom of cylinder.
Replace o-ring (207) if desired. NOTE: O-ring (207)
is not required for safe pump operation.
21. Torque seal and packing nut (202) down onto throat
adjustment spacer (228) to 100 +/- 10 in-lb (11.3 +/-
1.1 N•m).
Remove o-ring when pump packings begin to leak
after extended use. Then tighten packing nut down
until leakage stops or reduces. This allows approxi-
mately 100 gallons of additional operation before a
repacking is required.
22. Push up retaining spring (26) with screwdriver.
23. Push in pin (29). NOTE: Make sure retaining ring
falls into slot.
NOTICE
Do not slide piston assembly into top of sleeve as this
may damage piston packing.
202
228
