Replace Pilot Valves - Graco NXT M02 Series Instructions - Parts Manual

Repair
Reassemble the Air Valve
1. Lubricate detent cam (104◆) and install into hous-
ing.
2. Lubricate the u-cups (108†◆) and install on the pis-
ton (102◆) with lips facing toward the center of the
piston.
108†◆
Lips face down
102◆
108†◆
Lips face up
F . 7: Air valve u-cup installation
IG
3. Lubricate both ends of the piston (102◆) and install
it in the housing.
4. Lubricate and install the detent assembly (103◆)
into the piston.
5. Standard models: Lubricate new o-rings (106†✠◆)
and install on the end caps (107✠). Install the end
caps into the housing.
DataTrak models: Lubricate and install new o-ring
(106†✠◆) on bottom end cap (107✠). Lubricate and
install new o-ring (119†✠◆) and runaway reset but-
ton (118) on top end cap (117✠). Install the end
caps (107✠, 117✠) into the housing.
6. Install a snap ring (110◆✠) on each end to hold end
caps in place.
12
7. Install the spring (111◆). Lubricate and install the
air valve cup (112◆). Align the small round magnet
with the air inlet.
112◆
F . 8: Air valve cup installation
IG
8. Install the valve plate (105◆). Tighten the screws
(109†◆) to hold it in place.

Replace Pilot Valves

1. Stop the pump at the middle of its stroke. Relieve
ti12754a
the pressure. See page 9.
2. Disconnect the air line to the motor.
3. Remove the tie rod shield (TS). Slide the drip shield
(DS, if present) down on the tie rods.
DS
4. Use a 10 mm socket wrench to remove the old pilot
valves (19) from the top and bottom covers.
5. Lubricate and install the new pilot valves (19).
Torque to 95-105 in-lb (11-12 N•m).
Magnet
ti12752a
ti12916a
TS
312796B