Repair; Pressure Relief Procedure; General Information; Repair Air Valve - Graco NXT 25A641 Instructions/Parts And Repair

Repair

Pressure Relief Procedure

Follow the Pressure Relief Procedure whenever
you see this symbol.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as skin injection, splashing
fluid, and moving parts, follow the Pressure Relief
Procedure when you stop dispensing and before
cleaning, checking, or servicing the equipment.
The NXT air motor is used with the Graco DynaMite 190
Pump. Follow the Pressure Relief Procedure
described in the DynaMite 190 Pump Instructions, man-
ual 308302.

General Information

• Reference numbers and letters in parentheses in
the text refer to the callouts in the figures and the
parts drawing.
• Always use Genuine Graco Parts and Accessories,
available from your Graco distributor. If you supply
your own accessories, be sure they are adequately
sized and pressure rated for your system.

Repair Air Valve

Replace Complete Air Valve
1. Shut off air to the motor and relieve pressure.
2. Disconnect the air line to the motor.
3. See F . 5 on page 8. Remove four screws (211).
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Remove the air valve (214) and gasket (209).
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4. To repair the air valve, go to Disassemble the Air
Valve, page 5. To install a replacement air valve,
continue with step 5.
5. Align the new air valve gasket (209) on the mani-
fold, then attach the air valve (214). Torque screws
(211) to 95-105 in-lb (11-12 N•m).
6. Reconnect the air line to the motor.
Replace Seals or Rebuild Air Valve
NOTE: Air Valve Seal Kits are available. See page 16.
Air Valve Repair Kits are available. See page 16.
Air Valve End Cap Kits are available. See page 16.
Disassemble the Air Valve
1. Perform steps 1-3 under Replace Complete Air
Valve, page 5.
2. See F . 1. Use a 2 mm or 5/64 hex key to remove
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two screws (309). Remove the valve plate (305),
cup (312), and spring (311).
311
312
305
309
F . 1. Air Plate Removal
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3. See F . 2. Remove the snap ring (310) from each
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end. Use the piston to push the end caps (307) out
of the ends. Remove end cap o-rings (306).
4. Remove the piston (302). Remove the u-cup seals
(308) from each end and the detent assembly (303)
and detent cam (304) from the center.
Repair
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