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Page 10

Replacing Air Storage Tank Components
Pressure Switch Replacement

Reference Figure F

Tools:

1/8 hex drive or Allen wrench, #2 Phillips screw driver, 12 in. or smaller crescent wrench, thread seal-

ing compound or Teflon tape.

1. Unplug the AA-75CF compressor and drain the air storage tank.
2. Remove compressor chassis from case bottom as per the Compressor Chassis Removal section.
3. Remove four exhaust baffle screws to allow access to the pressure switch screws.
4. Loosen pressure switch cover screw and remove pressure switch cover.
5. Loosen the unloader valve nut and remove unloader tube.
6. Loosen screws on the pressure switch to release the motor power leads, the control wire leads and

the switch ground.

When replacing leads, be sure the wire pair leading through the motor exhaust chassis to the motor

connects to the MOTOR location on the pressure switch and that the wire pair from the control wire

set, contained in polyester braid, connects to the LINE location of the pressure switch. Similar wire

colors should attach on the same side of the pressure switch.

7. Remove pressure relief valve, female quick connect fitting, and pressure gauge.
8. Using the hex of the coupler fitting, turn pressure switch off of the air storage tank. Guide wires

slowly through the 5/8 grommet during the initial turn.

9. Remove the coupler fitting from the pressure switch.
10. Replace pressure switch and reassemble by reversing steps. Use Teflon tape to seal pipe threaded

fittings.

Note:

In addition to exposing wire connections, removing the pressure switch cover exposes a pair of

adjustment screws used to control the AA-75 CF compressor’s cut off pressure and pressure range.

By turning the metal screw clockwise the air storage tank cut off pressure is increased. Turning the

plastic screw clockwise increases the separation between the cut off and cut in pressure. Air storage

tank pressure should never be adjusted to exceed 110 psi.

Check Valve Replacement

Reference Figure G

Tools:

12 in. or smaller crescent wrench, Teflon tape or thread sealing compound.

1. Remove compressor chassis from case bottom as per the Compressor Chassis Removal section.
2. Loosen nuts on 1/8 poly fittings and disconnect unloader tube and tank side tank drain tube.
3. Push in the release ring of the push-in elbow fitting on the tank then pull tank/aftercooler tube

loose.

4. Remove push-in elbow fitting and 1/8 tube fitting from the check valve.
5. Remove check valve from the air storage tank.
6. Replace check valve and reassemble by reversing steps. Use Teflon tape to seal pipe threaded

fittings.

Removing the Air Storage Tank

Reference Figure G

1. Remove compressor chassis from case bottom as per the Compressor Chassis Removal section.
2. Complete Pressure Switch Replacement procedure omitting steps 7, 9 and 10.
3. Complete Check Valve Replacement procedure omitting steps 4 and 6.
4. Remove three tank assembly screws and the 1/8 tube fitting on the tank bottom.
5. Rotate the air storage tank slowly clockwise and remove through the exhaust duct side of the

compressor chassis leading with the tank bottom.