7. Hold piston rod 320746 at its bottom flats and
unscrew spacer 320749 from the piston rod.
8. Pull piston rod down and out of air motor body
338906.
9. Unscrew inlet body 320727. Remove “O” ring
171009-29.
10. Unscrew two toggle caps 337471. Remove
springs 317524 and “O” rings 171000-14.
11. Slide plungers 321457 and toggles 320737 out of
shuttle 320736 and remove shuttle.
12. Unclamp and turn the air motor to the horizontal.
Clamp the air motor body, with the inlet body
opening face up.
13. Through the air-inlet body opening, unscrew four
screws 171636. Lift out valve retaining spring
330842, slide valve 320726, valve retainer
330843, valve seat 320730, and gasket 320731.
NOTE
Inspect slide valve and seat (part of 398439) for any
scoring or damage. They must be replaced if there is
any damage.
14. Remove retaining ring 171006-15, brass washer
320748, leather washer 314671 and block “V”
packing 314670, from inside of packing nut at top
of the air motor base
NOTE
Packing nut 320745 is staked in place and should not
be removed unless damaged. If the retaining ring is
damaged, order either the packing nut 320745 or the
entire air-motor base assembly (See Figure 3). This
part must be staked into position when reassembled.
15. Remove retainer 321633, adapter 331342,
washer 310010, v-packing 310011, and o-ring
171000-17 from the air-motor base.
16. Inspect the body 338906 for excessive rust or
damage. If this part must be replaced, it can be
removed from adapter 321087. The two parts are
sealed together with o-ring 171009-41, then
staked together. The parts must be staked into
position after reassembly.
17. Clean all parts and inspect for wear or damage.
CAUTION
Worn or damaged motor and pump parts can
cause injury to personnel and damage to
property. REPLACE any worn or damaged parts.
If using an Alemite repair kit, use all replacement
parts in kit.
REASSEMBLY OF AIR MOTOR
1. Before reassembling the air motor, lubricate
parts as noted in the following instructions:
a. Lubricate all “O” rings, seals, and packings
with oil.
b. Brush a coat of grease containing molybde-
num (moly) in toggle sockets of shuttle
320736 and plungers 321457, inside bore of
shuttle, outside diameter of plungers, and on
slide valve 320726.
c. Dip gasket 320731 and springs 317524 in
Lubriplate #1550 lubricant.
d. Coat the bore of cylinder 331843-4 and out-
side diameter of piston 321082 with the mix-
ture outlined in step 1c.
e. Soak leather washer 314671 in SAE No. 30
oil for a minimum of eight hours.
2. Before reassembly of the air motor, reassemble
all parts that must be staked into position, as
noted in the following instructions:
a. Packing nut 320745 is sealed to the top of
body 338906 with o-ring 171013-12. Stake
the packing nut to the body.
b. Body 338906 and adapter 321087 are
sealed together with o-ring 171009-41. Stake
the adapter to the body.
3. Position block “V” packing 314670, leather
washer 314671, and brass washer 320748 into
packing nut. Secure with retaining ring 171006-
15 (See Figure 3a).
NOTE
The open end of the “V”, from block “V” packing
314670 must face the bottom of air motor base.
(Step 3).
4. Slide washer 310010 into adapter 331342. Slide
v-packing 310011 into adapter.
NOTE
The open end of the “V”, from block “V” packing
310011 must face the top of air motor base. (Step 4).
5. Slide adapter 331342 into the air-motor base.
6. Place gasket 320731, valve seat 320730, valve
retainer 330842, slide valve 320726, and valve
retaining spring 330842 into air motor base.
Secure with four screws 171636.
4
