Repair
Repair Piston
Note
The piston valve is avai lable as a
preassembled, pre–lubricated kit. The kit
includes the piston seat/guide assembly (P,
items 6, 9, 10, 11, and 12). Order Part No.
237906.
1. Follow Replace Intake Valve, page 12,to
disassemble the pump.
2. Remove outlet housing (3).
3. Using a rubber mallet, drive the displacement
rod (1) and the priming piston rod (17) out of the
cylinder (8). Inspect the outer surfaces of the
rods for damage by running a finger over the
surface.
Figure 7
4. Remove the seal (6) from the botto m of the
cylinder (8). See Fig. 7. Shine a light into the
cylindertoexaminetheinsidesurfaceforscoring
or damage.
Only if the cylinder is damaged,
or there is evidence of leaking around the top
cylinder seal (6),
unscrew the cylinder from the
outlet housing, using a pipe wrench. Remove the
top cy linder seal.
Figure 8
5. Place the flats of the displacement rod (1)
in a vise. Unscrew the piston (9) from the
displacement rod; the priming piston rod (17)
will come with it. Slide the piston seat/guide
assembly (10, 11, and 12) off the piston (9).
Figure 9
14
334127A
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