Service
8 306518ZAC
Service
Displacement Pump Service
Pump Repair Kit 238286 is available and includes repair
parts for the pump and air motor. Use all parts in the kit
for best results.
1. Flush the pump.
2. Relieve the pressure before proceeding, page 6.
3. Disconnect the hoses, remove the pump from its
mounting, and clamp the air motor base (5) in a vise
horizontally by closing the vise jaws on the flange.
4. Unscrew the intake valve body (107) from the fluid
cylinder (105). Disassemble the intake valve. (See
Parts Drawing Page 12.) Clean and inspect the
parts for wear or damage, and replace parts as
needed. be sure to check the o-ring (108). Unless
further intake valve service is needed, reassemble
and reinstall, using liquid sealant on the male
threads.
5. Use strap wrench on the fluid cylinder (105) to
screw it out of the air motor base (5). Carefully
inspect the smooth inner surface on the cylinder for
scoring or irregular surfaces. Such damage causes
premature packing wear and leaking, so replace the
part if it is damaged.
6. Using wrenches on the flats of the displacement rod
(8) and on the flats of the fluid piston (11), unscrew
the fluid piston from the displacement rod.
7. Take the ball (111) out of the displacement rod (8),
and take the packing o-ring (104) off of the fluid pis-
ton.
8. Clean and inspect all parts. Use all the repair kit
parts during reassembly and replace other parts as
necessary.
9. Place the piston ball (109) in the displacement rod
(8).
10. Install the new packing o-ring (104) on the fluid pis-
ton (110).
11. Clamp the flats of the fluid piston (110) in a vise,
and torque the displacement rod (8) to the piston to
40 to 60 ft-lbs (54 to 81 N.m).
12. Clamp the air motor base (5) in a vise horizontally
by closing the vise jaws on the flange.
13. Use a strap wrench to screw the displacement
pump cylinder (105) to the air motor base (5), and
torque to 95 to 105 ft-lbs (129 to 142 N.m).
14. If the ground wire was disconnected before servic-
ing, be sure to reconnect it before you operate the
pump.
Air Motor and Throat Service
Refer to FIG. 3 and FIG. 4 for the following instructions.
Pump Repair Kit 238286 is available and includes repair
parts for the pump and air motor. Use all parts in the kit
for best results.
Two accessory tools should be used: Padded Pliers,
207579, are used to grip the trip rod without damaging
its surface; Gauge, 171818, is used to ensure the proper
clearance between the poppets and seat of the transfer
valve.
Disassembly
1. Flush the pump.
2. Relieve the pressure, see page 6.
3. Disconnect the ground wire from the grounding
screw (5a), disconnect the hoses, remove the pump
from its mounting, and clamp the air motor base in a
vise horizontally by closing the vise jaws on the
flange.
4. Use a strap wrench on the fluid cylinder (105) to
screw it out of the air motor base (5).
5. Pull the displacement rod (8) down as far as it will
go. (F
IG. 3)
