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Displacement Pump Repair
Intake Valve. See Fig. 11.
1. If possible, flush the pump.
2. Relieve the pressure.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
3. Unscrew the valve body (119). Remove the o-ring
(108), ball (106), and retainer (120).
4. 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. 11.
NOTE: Clean and inspect all parts for wear or
damage as you disassemble them. Replace parts as
needed. For the best results, always replace all the
o-rings and packings when you disassemble the pump.
The parts list on page 19 gives the recommended
parts to keep on hand.
1. If possible, flush the pump.
2. Relieve the pressure.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
3. Follow Disconnecting the Reciprocator and
Displacement Pump on page 9. Remove the
intake valve.
4. Carefully inspect the smooth, inner surface of the
cylinder (118) for scoring or irregular surfaces.
Such damage causes premature seal wear and
leaking, so replace the part if needed.
5. Grease the new piston seal and install with the lips
facing up as shown in Fig. 11.
6. Reconnect reciprocator and displacement pump
per steps 1 through 6 of
Replacing Throat Seals
Assembly after
on page 13.
115
116
110
112
117
120
106
119
Lips face down.
Lips face up.
Fig. 11
104
118
108
108
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