20 308155
Displacement Pump Repair
(Models 239882, 224741, and 224742)
Intake Valve. See Fig. 13.
WARNING
To reduce the risk of serious injury, whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 9.
1. If possible, flush the pump. Relieve the pressure.
2. Unscrew the valve body (110). Remove the o-ring
(111), ball (109), and retainer (112).
3. Inspect the parts for wear or damage. If the ball is
nicked, replace it. Reassemble, using liquid thread
sealant on the male threads.
Displacement Pump. See Fig. 13.
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 22 gives the recommended parts to keep
on hand.
A guide collar is required for installing the piston in the
displacement cylinder. Order Guide Collar Tool, Part
No.168085, or make a collar using shim stock having a
0.016 in. (0.41 mm) maximum thickness.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 9.
1. If possible, flush the pump. Relieve the pressure.
2. Remove the intake valve. Follow Disconnecting
the Reciprocator and Displacement Pump
procedure on page 13.
3. Carefully inspect the smooth, inner surface of the
cylinder (108) for scoring or irregular surfaces.
Such damage causes premature packing wear and
leaking, so replace the part if needed.
4. Place the piston housing (104) in a vise. Unscrew
the piston seat (107), and remove the packings.
5. Grease the new piston packings, and stack them
one at a time on the piston seat (107), making
sure all parts face the way shown in Fig. 13. Install
the ball (116). Apply liquid sealant to the male
threads of the seat (107), and screw on the piston
housing (104).
6. Remove the ball retainer (112) from the intake
housing assembly by grabbing the open leg and
pulling it toward the center of the housing. Inspect
the ball (109) and seat, and replace as needed.
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