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Displacement Pump Service
Disassembly
NOTE: Displacement Pump Repair Kit 238225
includes repair parts for the pump throat and
piston. Use all the parts in the kit for the best
results. Parts included in the kit are marked
with a dagger, for example (7{), in the text and
drawings. See the Parts List on page 15.
1. Flush the pump.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
2. Relieve the pressure.
3. Disconnect the hoses, remove the pump from its
mounting, and clamp the air motor base (28) in a
vise horizontally by closing the vice jaws on the
flange.
Intake Valve. See Fig 5.
1. Relieve the pressure.
2. Unscrew the valve housing (111). Remove the
o-ring (105{), retainer (112), and ball (104).
3. Inspect the parts for wear or damage. If the ball is
nicked, replace it. Reassemble, using grease on
the male threads.
Displacement Pump. See Fig 5.
NOTE: Clean and inspect all parts for wear or damage
as you disassemble them. Replace parts as
needed. For best results, always replace all
the o-rings and packings when you disassem-
ble the pump.
1. Relieve the pressure.
2. Follow steps 1 to 7 of Disassembly on page 10.
3. Carefully inspect the smooth inner surface of the
cylinder (110) for scoring or irregular surfaces.
Such damage causes premature seal wear and
leaking. Replace the cylinder as needed.
Reassembly
Do steps 16 through 23 in Air Motor and Throat
Service on page 13.
Fig. 5
104
111
105{
110
112
05617
{ Included in Pump Repair Kit 238225, which may
be purchased separately. The Parts List on page
15 includes all parts in kit.