Graco NXT Air Motor M02LN0 Instructions And Parts page 14

Repair
Disassemble the Air Motor
1. For motors with DataTrak: Remove screw to dis-
connect the reed switch from the air valve. See F
3, page 9.
2. Use a 10 mm socket wrench to remove four screws
(18). Remove the air valve (17) and gasket (16*).
3. Remove the muffler(s).
4. Remove four screws (18) and remove the manifold
(15*) and two gaskets (14*).
5. Use a 10 mm socket wrench to remove the pilot
valves (19) from the top and bottom cover.
6. Remove the tie bolts.
Tie Bolt
Model Hex Size
M02xxx 13 mm
M04xxx 13 mm
M07xxx
and 17 mm
M12xxx
M18xxx
and 17 mm
M34xxx
14
.
IG
ti12747a
ti12748a
ti12749a
ti12750a
7. Remove the top cover. Remove the o-ring (9*).
8. Remove the shield (12) from around the cylinder.
Remove the cylinder (11).
9. Depending on your displacement pump model, you
may need to remove an adapter from the bottom of
the piston assembly.
10. Slide the piston assembly (5) straight up off the bot-
tom cover.
NOTICE
Do not attempt to take apart the piston assembly (5).
11. Remove o-ring (8*) from around the piston.
12. Remove u-cup seals (3*, 43*), and o-ring (9*) from
the bottom cover.
Reassemble the Air Motor
NOTE: For easier reassembly, start with the top cover
(13) turned over on the workbench and assemble the air
motor upside-down.
1. Lubricate and install the o-ring (9*) on the top cover
(13).
2. M07xxx, M12xxx, and M18xxx only: Install the
upper bumper (29) on the top cover (13).
3. Lubricate the inside of the cylinder (11). Lower the
cylinder (11) onto the top cover (13).
4. Lubricate and install the o-ring (8*) around the pis-
ton (5).
5. Slide the piston assembly (5) down into the cylinder
(11). Be sure the o-ring (9*) stays in place.
6. Install the shield (12) around the cylinder (11) and in
the groove on the top cover (13).
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