Graco 309868D important safety instructions Clean and Service, Reassembly

12.Remove the o–ring (18*) from the air motor piston (34).

13.Clamp the displacement rod upright in the vice by closing the vice jaws on the flats of the displace- ment rod.

14.Use a screwdriver to push down on the trip rod yoke (23) to snap the toggle assemblies (L) down. See FIG. 4.

15.Remove the lockwires (25*) from the adjusting nuts (24*) of the transfer valves. Screw the top nuts off. Screw the valve poppet (32*) stems out of the grommets (17*) and bottom nuts (24*). Take the valve poppets off of the stems, and squeeze them firmly to check for cracks.

16.Grip the toggle arms (38) with pliers. Compress the springs (20) and swing the toggle assembly (L) up and away from the piston lugs (M), and remove the assembly. Check that the valve actuator (27) is sup- ported by the spring clips (26), but slides easily into them. See Fig. 4.

To reduce the risk of pinching or amputating your fin- gers, always keep fingers clear of the toggle assemblies (L).

17.Remove the trip rod yoke (23), actuator (27), and trip rod (40). Check the exhaust valve poppets (31*) for cracks.

To remove the exhaust valve poppets (31*), stretch them out and cut the end off with a sharp knife.

Clean and Service

1.Clean all the parts carefully in a compatible solvent and inspect for wear or damage. Use all the repair kit parts during reassembly, and replace other parts as necessary.

2.Check the polished surfaces of the air motor piston (34), displacement rod (29), and cylinder wall (35) for scratches or wear. A scored rod will cause premature packing wear and leaking.

3.Lubricate all parts with a light weight, water-resis- tant grease.

Air Motor and Throat Service

Reassembly

1.Clamp the displacement rod (29) upright in the vice by closing the vice jaws on the flats of the displace- ment rod.

2.Pull the new exhaust valve poppets (31*) into the valve actuator (27), and clip off the top parts of the poppets (shown with dotted lines in the Cutaway View in Fig. 4).

3.Install the new grommets (17*) in the actuator (27), place the inlet valve poppets (32*) in the piston, and thread the bottom valve nuts (24*) onto the stems of the inlet valve poppets until there are a few threads left before the threads run out.

If you thread the valve nuts too far down onto the poppets, they will run off the threaded part of the poppets.

4.Grease heavily and place the trip rod (40) in the air motor piston (34), place the actuator (27) in the yoke (23), and place the well–greased actuator/yoke assembly in the piston, with the trip rod going through the center holes of the actuator and yoke and the stems of the inlet valve poppets (32*) going through the grommets (17*).

5.Thread the top valve nuts (24*) onto the stems of the inlet valve poppets (32*) until one thread of the inlet valve poppets is exposed above the valve nuts.

6.Install the toggle pins (36) in the yoke (23), place the toggle arm (38) ends of the toggle assembly (L) onto the toggle pins, and snap the pivot pin (37) ends of the toggle assembly into the piston lugs (M).

7.Measuring with the gauge (Part No.15E796), create 0.105 in. (2.7 mm) of clearance between the inlet valve poppets (32*) and the piston seat when the inlet valve is open. See the Cutaway View in Fig. 4.

Adjust the distance between the inlet valve poppets and the piston seat by turning the top valve

nuts (24*).

8.Tighten the bottom valve nuts (24*) by hand. The grommets (17*) should be slightly compressed.

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