Graco 237010, 220667, 220666, 237012, 220663, 237008, 237013, 237011, 220664 Repairing the Pilot Valve

Service

Repairing the Pilot Valve

NOTE: Air Valve and Pilot Valve Repair Kit 220656 is available. See page 38 to order. Parts included in the kit are marked with an asterisk, for example, (5j*). Use all the parts in the kit for the best results.

Disassembly

1.Relieve the pressure.

WARNING

PRESSURIZED EQUIPMENT HAZARD

To reduce the risk of a serious injury whenever you are instructed to relieve pressure, follow the Pres- sure Relief Procedure on page 10.

2.Unscrew the valve cap (5c) from each of the valve housings (5d) and remove the parts. Clean and inspect the parts for damage. See Fig. 9.

3.To replace the rod seal (5j*):

a.Cut a small slit in the tube ends (72* and 42*) and disconnect them from the pilot valve fit- tings (5h) and air valve tees (40n).

b.Unscrew the cap screws (37) and remove the pilot valve housings (5d). Grease the rod seals (5j*) and install one on each side of the pump.

c.Secure the pilot valve housings (5d) to the pump with the cap screws (37).

d.Connect the new tubes (72* and 42*) to the pilot valve fittings (5h) and air valve tees (40n).

Assembly

1.Apply lithium base grease to the inside and outside of the air valve (5b), and to the o-rings and seals.

2.Install the o-ring (5e*), being sure to completely seat it on the flat in the valve housing (5d). Install the long end of the valve stem (5a) into the hous- ing.

3.Install the small spring (5g) over the valve stem (5a), the air valve (5b) over the spring, and the larger spring over the air valve.

4.With the copper gasket (5i*) in place on the valve cap (5c), screw the cap onto each of the valve housings (5d). Torque the cap to 7.4 to 12.5 ft-lb (10 to 17 NSm).

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