Graco Contractor King 279005 Instructions Manual page 28

Air Motor Repair
8. Reattach the solenoid bracket and the solenoid, if
needed.
9. Use screw to attach the reed switch assembly to
the new air valve, if needed. Be sure the sensor
cables are connected properly (see pump or
package manual).
10. Reconnect the air line and pilot valve lines to the
motor.
Replace Seals or Rebuild Air Valve
Contact Graco to order kits for your pump.
Disassemble the Air Valve
1. Perform steps 1–6 from Replace Complete Air
Valve, page 27.
2. Use a 3 mm hex key to remove two screws (315).
Remove the valve plate (314).
3. Remove the one-piece cup assembly (313), and
spring (310 - spring not shown).
301
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313
314
315
4. Remove the retaining ring (320) from each end. Use
the piston (304) to push the end caps (316) out of
the ends. Remove end cap o-rings (317).
5. Remove manual shuttle override buttons (319) from
inside end caps.
6. Remove manual shuttle override button o-rings
(318).
7. Slide out the piston (304). Ramp (305) is adhered to
the housing (301) and can be reused.
Reassemble the Air Valve
1. The piston (304) and u-cup seals (306) come
pre-assembled. Lubricate the u-cup seals (306) on
both ends of the piston (304) and install it in the
housing.
2. Lubricate and install the detent assembly (307) into
the piston, with the beveled center toward the
detent cam.
3. Lubricate and install new o-rings (317) on end caps
(316). Lubricate and install new o-rings (318) and
manual shuttle override buttons (319) on end caps
(316). Install the end caps into the housing.
4. Install a snap ring (320) on each end to hold end
caps in place.
5. Install the spring (310).
6. Install the base cup (313).
7. Install the valve plate (314). Lightly tighten the
screws (315) to hold it in place
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