Graco M04xxx, M34xxx Disassemble the Air Motor, Reassemble the Air Motor, Tie Bolt, 13 mm, 17 mm

Repair

Disassemble the Air Motor

1.For motors with DataTrak: Remove screw to dis- connect the reed switch from the air valve. See FIG. 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
		ti12747a
M04xxx	13 mm
		ti12748a
M07xxx
and	17 mm
M12xxx
		ti12749a
M18xxx
and	17 mm
M34xxx
		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).

14 312796R