Circuit Breaker - Graco 231–034 Instructions And Parts List

WARNING
To reduce the risk of a serious injury, follow the
Pressure Relief Procedure on page 4 whenever
you are instructed to relieve the pressure.
NOTE: The most common cause of a bridge fail -
ure is a faulty motor . Check the motor before replac-
ing the bridge to prevent damaging the new bridge.
NOTE: Refer to Fig. 17 for this procedure.
1. Relieve the pressure.
2. Remove the cover (63) of the pressure control.
3. Disconnect all the wires from the bridge (308).
303
G1
G2
Fig. 17
Circuit Breaker Replacement
WARNING
To reduce the risk of a serious injury, follow the
Pressure Relief Procedure on page 4 whenever
you are instructed to relieve the pressure.
NOTE: Refer to Fig. 17 for this procedure.
1. Remove the cover (63).
2. Use a small screwdriver to slide the terminal off of
the circuit breaker (309).
3. Disconnect the black wire (306) between the circuit
breaker (309) and the switch (303).
Bridge Replacement
310
309
306
308
63
4. Loosen but do not remove the screw (331A).
Remove the screw (331B). Slide out the bridge.
5. Install the new bridge (308). Be sure the lock-
washers (333) are IN FRONT of the bridge.
Tighten the screws (331) securely.
CAUTION
The lockwashers (333) must be in front of the
bridge to avoid overheating, which will cause the
bridge to fail. See the detail in Fig. 17.
6. Connect all the wires properly and route them
carefully.
01225
4. Use a 5/8 inch socket wrench to loosen the nut
and the boot (310) on the circuit breaker.
5. Push down on the top of the circuit breaker (309)
and pull it out of the pressure control.
6. Install the new circuit breaker in the reverse order
of disassembly.
CAUTION
Do not allow the contacts of the circuit breaker to
touch the bourdon tube, which will cause an electri-
cal short. Firmly tighten the nut on the circuit
breaker to prevent the circuit breaker from turning.
331A
331B
308
333
332