Graco Dyna-Star 25T843, Instructions Manual

Page: 12 / 22

Repair
12 Manual 3A7718A
Reassemble the Air Valve
1. Lubricate detent cam (104) and install into housing.
2. Lubricate the u-cups (108) and install on the piston
(103) with the lips facing the center of the piston.
3. Lubricate both ends of the piston (102) and install it
into the housing.
4. Lubricate the detent assembly (103) and install it
into the piston.
5. Lubricate new o-rings (106) and install on the end
caps (107) and install the end caps into the housing.
6. Install a snap ring (110) onto each end to held the
end caps in place.
7. Install the spring (111).
8. Lubricate and install the air valve cup (112).
9. Align the small round magnet with the air inlet.
10. Install the valve plate (105), then tighten the screws
(109) to hold in place.
Replace Pilot Valves
1. Stop the pump in the middle of its stroke. Follow
Pressure Relief Procedure , page 10.
2. Disconnect the air line to the motor.
3. Use a 10 mm socket wrench to remove the old pilot
valves (19) from the top and bottom covers.
4. Lubricate and install the new pilot valves (19)
(torque 95 - 105 in-lb/10.7 - 11.9 N•m).
F
IG
. 6
108
108
102
Lips Face Up
Lips Face Down
F
IG
. 7
112
Magnet