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308996
Service
Disassembly
When disassembling the pump, lay out all removed
parts in sequence, to ease reassembly.
NOTE: U–cup Repair Kits are available. For the best
results, use all the new parts in the kit. Kit parts are
marked with an asterisk, for example (8*).
1.
Fig. 4. Place outlet housing (7) in vise.
2.
Apply adjustable wrench to flats of intake
valve (19). Unscrew intake valve from
cylinder (9). Remove seal (8) from intake valve.
Remove ball stop (3) and ball (17). Inspect ball
and seat (D) of intake valve for wear or damage.
3.
Unscrew cylinder (9). Gently pull cylinder straight
out of outlet housing. Displacement rod (1) and
piston assembly may come out with cylinder. If not,
pull displacement rod out.
a.
Fig. 5. Unscrew wet cup (2) from outlet hous-
ing (7). Remove u–cup (4), bearing (5), and
seal (8).
b.
Fig. 4. Remove seal (8) from cylinder (9).
Shine light into cylinder to inspect inner sur-
face for scoring or wear.
4.
Fig. 6. Place flats of piston housing (16) in vise.
5.
Using adjustable wrench, unscrew displacement
rod (1) from piston housing. Examine displacement
rod for scratches or other damage.
6.
Fig. 7. Remove nut (13), lockwasher (12), u–cup
seals (14), and spacers (15) from piston
housing (16). Inspect seals for wear or damage.
7.
Clean all parts with compatible solvent and inspect
for wear or damage.
8.
Remove piston housing from vise. Remove
ball (11) and examine it and piston seat (A).
