Repair; Pressure Relief Procedure; Repair Or Replace Air Valve - Graco Husky 3300 Repair Parts

Repair

Repair

Pressure Relief Procedure

Follow the Pressure Relief Procedure when-
ever you see this symbol.
This equipment stays pressurized until pressure is
relieved manually. To help prevent serious injury from
pressurized fluid, such as splashing in the eyes or on
skin, follow the Pressure Relief Procedure whenever
you stop pumping and before you clean, check, or ser-
vice the equipment.
1. Shut off the air supply to the pump.
2. Open the dispensing valve, if used.
3. Open the fluid drain valve to relieve fluid pressure.
Have a container ready to catch the drainage.

Repair or Replace Air Valve

Replace Complete Air Valve
1. Stop the pump. Relieve the pressure. See Pressure
Relief Procedure in previous section.
2. Disconnect the air line to the motor.
3. Remove screws (104, metal pumps) or nuts (116,
plastic pumps). Remove the air valve and gasket
(113).
4. To repair the air valve, go to Disassemble the Air
Valve, step 1, in next section. To install a replace-
ment air valve, continue with step 5.
5. Align the new air valve gasket (113*) on the center
housing, then attach the air valve. See Torque
Instructions, page 20.
6. Reconnect the air line to the motor.
10
Replace Seals or Rebuild Air Valve
NOTE: Repair kits are available. See page 31 to order
the correct kit(s) for your pump. Air Valve Seal Kit parts
are marked with a †. Air Valve Repair Kit parts are
marked with a ◆. Air Valve End Cap Kit parts are
marked with a ✠.
Disassemble the Air Valve
1. Perform steps 1-3 under Replace Complete Air
Valve, page 10.
2. See F . 2. Use a Torx screwdriver (T8 for alumi-
IG
num centers, T10 for plastic centers) to remove two
screws (209). Remove the valve plate (205),
cup assembly (212-214), spring (211), and detent
assembly (203).
3. Pull the cup (213) off of the base (212). Remove the
o-ring (214) from the cup.
4. See F . 2. Remove the retaining ring (210) from
IG
each end of the air valve. Use the piston (202) to
push the end cap (207) out of one end. Remove the
u-cup seal (208). Pull the piston out the end and
remove the other u-cup seal (208). Remove the
other end cap (207) and the end cap o-rings (206).
5. Remove the detent cam (204) from the air valve
housing (201).
3A0411A