Repair
Manual 3A7718A
13
Repair Air Motor
Refer to
, on page 16 for this section.
NOTE: Air Motor Seal Kits are available. To order the
correct kit for the pump, see page 18. Parts included in
the kit are marked with an (*). For best results, use all of
the parts in the kit.
Disassemble the Air Motor
1.
Stop the pump in the middle of its stroke. Follow
2.
Disconnect the air lines.
3.
Use a 10 mm socket wrench to remove four screws
(18), then remove the air valve (17) and gasket (16).
4.
Remove four screws (18) to remove the manifold
(15) and gasket (14).
5.
Use a 10 mm socket wrench to remove the pilot
valves (19) from the top and the bottom covers.
6.
Remove the lift ring (31) and o-ring (32) from the
center of the top cover.
7.
Remove the tie bolts (10).
8.
Remove the top cover and take out the o-ring (9).
9.
Remove the cylinder (11).
10. Slide the piston assembly (5) straight up and off of
the bottom cover.
11. Remove the o-ring (8) from around the piston.
12. Remove the retaining ring (4), the u-cup seals (3,
33), and the o-ring (9) from the bottom cover.
Reassemble the Air Motor
NOTE: Use NLGI No. 1, bentone-based grease for
lubricant.
For easier reassembly, begin with the top cover (13)
turned over on the workbench then reassemble the air
motor from top to bottom.
1.
Lubricate and install the o-ring (9) onto the top cover
(13).
2.
Lubricate the inside of the cylinder (11) then lower
the cylinder (11) onto the top cover (13).
3.
Lubricate then install the o-ring (8) around the
piston assembly (5).
4.
Slide the piston assembly (5) down onto the cylinder
(11), making sure that the o-ring (9) stays in place.
5.
Lubricate then install a new u-cup seal with flange
(33) in the bottom of the bearing located in the
bottom cover (1), making sure that the u-cup faces
up and the flange faces down. Then lubricate and
install a new u-cup seal (3) in the top of the bearing
making sure that the u-cup lips are facing up (F
8).
6.
Install the retaining ring (4).
7.
Lubricate and install the o-ring (9) onto the bottom
cover (1).
8.
Place the bottom cover (1) carefully onto the
cylinder (11), sliding the rod through the bearing.
The manifold surfaces of the top and bottom covers
must align.
9.
Install the tie bolts (10) and hand tighten.
NOTICE
To prevent damage, do not attempt to take apart the
piston assembly (5).
F
IG
. 8
3
Lips Face Up
33
Lips Face Up
4
Summary of Contents for Dyna-Star 25T843
Page 15: ...Notes Manual 3A7718A 15 Notes...
