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Repair
10 308883T
Air Motor and Throat Seals
Reassembly
1. Clean all the parts carefully in a compatible solvent,
and inspect for wear or damage. Use all the repair
kit parts during reassembly, and replace other parts
as needed.
2. Check the polished surfaces of the piston (2), dis-
placement rod (8), and cylinder (17) wall for
scratches or wear. A scored rod causes premature
throat seal wear and leaking.
3. Lubricate all parts with a light, water-resistant
grease.
4. Install the new throat seal (6), lips facing down.
Screw the packing nut (38) into the base (5).
5. Slide the displacement rod (8) down through the
throat, and lower the piston (2) into the base (5). Be
sure the o-rings (9, 10, and 24) are in place. (F
IG. 4)
6. Pull the exhaust valve poppets (16) into the value
actuator (13), and clip off the top part shown with
dotted lines in F
IG. 5.
7. Install the transfer valve grommets (12), and reas-
semble the valve mechanism. Before you install the
lockwires (31) in the adjusting nuts (30), use the
special gauges, 171818, to adjust the transfer valve
so there is 0.145 inches (3.7 mm) clearance
between the poppets (1b) and the seat when it is
open. Snap the toggles (25) to the up position. (F
IG.
5)
8. Reassemble the air motor, and assemble to the dis-
placement pump. Torque the extensions tube (64)
to the base (5) at 45 to 55 ft-lbs (61 to 75 N.m).
Before you install the air motor plate, tighten the
throat packing nut (38) snugly; do not overtighten it.
9. Before you remount the pump, connect an air hose,
and run the pump slowly, at about 40 psi (.028 MPa,
2.8 bar), to see that it operates smoothly.
10. Reconnect the ground wire before regular operation
of the pump.
FIG. 5
1
14
16
31
30
1b
12
1b
2
11 22
M
26 27 25
L
2
13
14
11
0.145 in.
(3.7 mm)
2
1b
16
1a
30
12
30
24
Cutaway View
30
3