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Air Motor and Throat Service
12. Slide the piston rod (29) down through the
packing, and lower the piston (27) into the air
motor base (28).
13.
Clamp the air motor base (28) in a vise horizontally
by closing the vice jaws on the flange.
14.
Install the u-cup packing (107t) with the lips up,
and place the piston washer
(113) on the
pistodvalve seat (109).
NOTE: Make sure the lips of the u-cup packing
(107t) face up. See Fig. 3.
15. Place the piston ball (103)
in the piston rod
(29).
17. Clamp the flats of the pistodvalve seat
(109)
in
a
vice, and, using a crow's-foot wrench, torque the
piston rod (29) to the piston valve seat to
40
to 60
ft-lb.
18. Clamp the air motor base (28) in a vise horizontally
by closing the vice jaws on the flange
19. Use a strap wrench to screw the displacement
pump cylinder (110) to the air motor base (28), and
toque with a crow's-foot wrench to 95 to
105
ft-lb.
20.
Before remounting the pump, connect an air hose
and run the air motor slowly (at about
40
psi
[3 bar]) to see that
it operates smoothly.
16.
Apply Loctitem to the threads of the pistodvalve
21. Reconnect the ground wire before regular
seat (109). and thread the assembly from Step
14
operation of the pump.
onto the piston rod (29).
Displacement Pump Service
Disassembly
1. Follow
the
Pressure
Relief
Procedure on
NOTE:
Displacement Pump Repair Kit 237-602
page 8.
includes repair parts for the pump throat and
2. Follow steps 1 through
6
of Disassembly on page
1.
2.
piston. Use all the parts in the kit for the best
results. Parts included
in
the kit are marked
with a dagger, for example
(i't),
in the text and
drawings. See the
Parts
List on page
16.
Flush the pump. Follow the Pressure Relief
Procedure on page
8,
before proceeding.
mounting, and clamp the air motor base
(28)
in a
Disconnect the hoses, remove the pump from its
vise horizontally by closing the vice jaws on the
flange.
Intake Valve
See Fig 5 .
1. Follow the Pressure Relief Procedure on
page 8.
2. Unscrew the vatve housing (111). Remove the
O-ring (105t), 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
disassemble the pump.
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
14
through
21
in Air Motor and Throat
Service
on
this page.
Fig.
5
t
lncluded in Repair Kif
237-602.
308-485
13
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