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12 308639
Service
Repairing the Air Valve
Tools Required
D Torque wrench
D 7-mm or 9/32-in. socket wrench or TorxR
screwdriver T20
D Needle-nose pliers
D O-ring pick
D Lithium-base grease, Part No. 111920 (Lubriplate
630AA or equivalent)
NOTE: Air Valve Service Kit 238765 is available.
Parts included in the Air Valve Service Kit are marked
with a symbol in the Air Motor Parts List, for
example (3{). See page 23. Use all the parts in the
kit for the best results.
Disassembly (See Fig. 4)
1. Relieve the pressure.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 9.
2. With a 7-mm or 9/32-in. socket wrench or TorxR
T20 screwdriver, remove the screws (3), air valve
cover (5), and valve cover gasket (20).
3. Move the main valve (6) to the center position, and
pull it out of the cavity. Using a needle-nose pliers,
pull the pilot block (16) straight up and out of the
cavity.
4. Pull the two actuator pistons (7) out of the
bearings (8). Remove the u-cup seals (9) from the
pistons. Pull the push pins (18) out of the bearings
(17). Remove the o-rings (19) from the housing
(2) with an o-ring pick.
5. Inspect the valve plate (11) in place. If damaged,
use a TorxR T20 screwdriver or 7-mm or 9/32-in.
socket wrench to remove the screws (3).
6. Remove the valve plate (11) and seal (12). See
Fig. 5.
7. Inspect the bearings (8 and 17) in place. The
bearings are tapered, and, if damaged, must be
removed from the outside. See Removing and
Replacing Bearings and Air Gasket on page 18.
8. Clean all parts and inspect for wear or damage.
Replace as needed. Reassemble as explained on
page 13.
06323
06322
Torque to 28 to 50 in-lb (3.2 to 5.6 NSm).
Fig. 4
3
2
2
5
20
6
16
7
8
9
18
17
19
11
3
2
1
Apply grease to lapped
surfaces of 16.
1
Install with lips facing narrow end of piston.
3
groove
2
4
Insert narrow end first.
4
5 Insert wide end first.
5
6
Grease.
6
6
3