Disassembly

Service

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).

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