Graco 231-081, Instructions And Parts List

27

307–920

BRIDGE RECTIFIER REPLACEMENT

Before doing this procedure, follow the 

Pressure

Relief Procedure Warning 

on page 23 to reduce

the risk of a fluid injection injury , splashing in the

eyes or on the skin, injury from moving parts, or

electric shock. 

Unplug the sprayer

.

WARNING

NOTE:

The most common cause of bridge failure is

a faulty motor.

 Check the motor before replac-

ing the bridge to prevent damaging the new

bridge.

1.  Remove the pressure control cover.
2.  Disconnect all wires from the bridge (308) at the ap-

propriate terminals.

3.  Outside the pressure control are two screws (331).

Loosen, but don’t remove the screw near the back of

the control. Then loosen and remove the front screw.

Slide the bridge out.

4.  Slide the slotted end of the new bridge (308) into the

pressure control so the lockwasher (333) on the rear

screw (331) is IN FRONT of the bridge. See the DE-

TAIL below.

5.  Install the front screw (331), lockwasher (333) and

nut (332). Make sure the bridge is flush with the side

of the pressure control and tighten the screws se-

curely.

The lockwashers (333) must be in front of the bridge

to avoid overheating which will result in bridge

failure.

 Refer to the DETAIL in Fig 17.

CAUTION

6.  Connect all wires. Carefully route the wires.

Be sure the flat blade of the insulated male connector

is centered in the wrap–around blade of the female

connector when the connections are made. Improper

connections may cause the sprayer to malfunction.
Route all wires carefully to avoid interference with the

movement of the bourdon tube, circuit board, or

pressure control cover which could cause a

malfunction.

CAUTION

7.  Reinstall the pressure control cover.

Fig 17

332

333

308

331

BRIDGE INSTALLATION DETAIL

303 310

309

308

306

SLOTTED 

END

LOOSEN AND

REMOVE

LOOSEN THIS SCREW

BUT DO NOT REMOVE

CIRCUIT BREAKER REPLACEMENT

Before doing this procedure, follow the 

Pressure

Relief Procedure Warning 

on page 23 to reduce

the risk of a fluid injection injury , splashing in the

eyes or on the skin, injury from moving parts, or

electric shock. 

Unplug the sprayer

.

WARNING

1. Remove the pressure control cover.
2. Use a small screwdriver to slide the terminal adapter

off the circuit breaker terminal.

3. Disconnect the single black wire from the circuit

breaker (309) to the ON/OFF switch (303).

4. Use a 5/8” socket wrench to loosen the nut and boot

(310) on the circuit breaker button.

5. Push down on the top of the circuit breaker and pull it

out of the pressure control.

6. Install the new circuit breaker in the reverse

order.

7. Reinstall the pressure control cover.

Do not allow the circuit breaker contacts to touch the

bourdon tube, which will cause a short. Tighten the

circuit breaker nut firmly to prevent the circuit

breaker from turning.

CAUTION

6.  Reinstall the cover.