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Displacement Pump Service
12 309868D
Displacement Pump Service
Be sure you have all necessary parts on hand. Pump
Repair Kit 246918 includes repair parts for the pump
and air motor. Use all of the parts in the kit for the best
results. Parts included in the kit are marked with one
asterisk, for example (13*), in the text and drawings. See
Parts, page 14.
1. Flush the pump and relieve the pressure.
2. Disconnect the hoses, remove the pump from its
mounting, and clamp the air motor base in a vise
horizontally by closing the vice jaws on the flange.
3. Unscrew the intake valve housing (106) from the
fluid cylinder (105). Disassemble the intake valve
(see Parts, page 14). Clean and inspect the parts
for wear or damage, and replace parts as needed.
Be sure to check the o-ring (104*). Unless further
intake valve service is needed, reassemble and
reinstall, using liquid sealant on the male threads.
4. Use a strap wrench on the fluid cylinder (105) to
screw it out of the air motor base (28). Carefully
inspect the smooth inner surface of the cylinder for
scoring or irregular surfaces. Such damage causes
premature packing wear and leaking, so replace the
part if it is damaged.
5. Using wrenches on the flats of the displacement
rod (29) and on the flats of the fluid piston (107),
unscrew the fluid piston from the displacement rod.
6. Take the piston ball (100) out of the displacement
rod (29), and take the packing o-ring (102*) off of
the fluid piston (107).
7. Clean and inspect the parts. Use all the repair kit
parts during reassembly, and replace other parts as
necessary.
8. Place the piston ball (100) in the displacement
rod (29).
9. Install the new packing o-ring (102*) on the fluid
piston (107).
10. Clamp the flats of the fluid piston (107) in a vice and
torque the displacement rod (29) to the piston to
40 to 60 ft-lb (54 to 81 N•m).
11. Clamp the air motor base (28) in a vise horizontally
by closing the vice jaws on the flange.
12. Use a strap wrench to screw the fluid cylinder (105)
to the air motor base (28), and torque to
40 to 60 ft-lb (54 to 81 N•m).
13. If you disconnected the ground wire, reconnect it
before you resume regular pump operation.
To reduce the risk of serious injury whenever you are
instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 6.