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Air Motor and Throat Service
8 309868D
Air Motor and Throat Service
Before You Start
• Be sure you have all necessary parts on hand.
Pump Repair Kit 246918 includes repair parts for
the pump and air motor. Use all the parts in the kit
for the best results. Parts included in the kit are
marked with one asterisk, for example (17*), in the
text and drawings. See Parts, page 14.
• Two accessory tools should be used: Padded
Pliers, 248198, are used to grip the trip rod without
damaging its surface. Gauge, 15E796, is used to
ensure the proper clearance between the poppets
and seat of the transfer valve.
Disassembly
1. Flush the pump, and relieve the pressure.
2. Disconnect the ground wire from the grounding
screw (28a), 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. Use a strap wrench on the fluid cylinder (105) to
screw it out of the air motor base (28). See Parts,
page 14.
4. Pull the displacement rod (29) down as far as it will
go. See F
IG. 3.
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.
Remove the ball (100) from the end of the displace-
ment rod, and remove the packing o–ring (102*)
from the fluid piston. See Parts, page 14.
6. Clamp the air motor upright in the vice by closing
the vice jaws below the flange.
7. Unscrew the cylinder cap nut (39) from the top of
the air motor cylinder (35).
8. Pull up on the cylinder cap nut (39) to expose the
trip rod, grasp the trip rod with padded pliers (Part
No. 248198), and unscrew the cylinder cap nut from
the trip rod.
9. Remove the six screws (9) holding the air motor
cylinder (35) to the air motor base (28), and care-
fully pull the cylinder straight up off of the
piston (34).
10. Pull the air motor piston/displacement rod assembly
(29, 34) clear of the air motor base (28) by pulling up
on the air motor piston.
11. Remove the o–rings (13*, 103*) and u–cup
packing (16*) from the air motor base (28). Use nee-
dle–nose pliers to remove the u–cup packing from
the bottom of the air motor base.
To reduce the risk of serious injury whenever you are
instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 6.
CAUTION
Do not damage the plated surface of the trip rod (40).
Damaging the surface of the trip rod can result in
erratic air motor operation. Use the special padded
pliers to grasp the rod.
CAUTION
To avoid damaging the cylinder wall, lift the cylinder
straight up off of the piston. Never tilt the cylinder
while you are removing it.
F
IG. 3
39
35
32*
34
28a
16*
28
40
18*
19
13*
9
flange
29
05725B