Bunn LPG-2, G9WD MOTOR Models G9, G9-2, MHG, SERVICE Cont, Franklin Motor, Marathon Motor

SERVICE (Cont.)

MOTOR (Models G9, G9-2, MHG)
FIG. 15 MOTOR	P1309

Location:

The motor is located in the upper wrapper under the hopper.

Test Procedure:

1.Remove the hole plug located on the right side of the housing. Press the red “Reset” button visible through the opening. Listen carefully for a “click”. This resets the motor protection circuit and may indicate that something other than coffee was inserted into the hopper for grinding.

If the grinder remains unable to start, proceed to step 2. If the grinder stops operating shortly after starting, refer to the removal and replacement steps to gain access-to the grind chamber. Remove any foreign materials that may be found.

2.Disconnect the grinder from the power supply.

3.Remove the electrical access panel at the rear of the motor.

4.Check the voltage across terminals L1 & L2 of the motor with a voltmeter when the Off/On/Start switch is placed in the “START” (right) position and released. Connect the grinder to the power supply. The indication must be:

(a)120 volts ac for two wire 120 volt models.

(b)240 volts ac for two wire 240 volt models.

5.Disconnect the grinder from the power supply.

If voltage is present as described and the grinder remains unable to start, replace the motor.

If voltage is not present as described, refer to the Wiring Diagrams, and check the grinder wiring harness.

Removal and Replacement - MOTOR

1.Remove all wires from the Off/On/Start switch, motor, and motor mounting plate.

2.The entire wiring harness must be fed into the bottom of the grinder housing through the hole in the motor mounting plate.

3.Remove both 6-32 screws beneath the upper front inspection panel.

4.Remove the six 10-32, hex head screws on top of the motor mounting plate.

5.Slowly slide the assembly out the rear of the grinder housing. The mounting plate will have to be raised to gain clearance for the motor hardware and wiring harness bushing.

6.Remove the four 5/16”-18 bolts and nuts to separate the motor from the mounting plate.

7.Mount the new motor and tighten the four bolts and nuts. They should be tightened approximately one full turn past snug.

8.Slide the motor mounting plate into the rear of the grinder housing.

9.Feed the wiring harness into the top of the housing through the hole in the motor plate.

10.Reinstall the six 10-32 hex head screws through the motor plate and the two 6-32 screws through the housing.

11.Reattach the green wire to the 10-32 stud on the motor mounting plate.

12.Refer to the Off/On/Start switch section when recon- necting the switch wires.

13.Refer to the illustration below when reconnecting the motor wires.

	WHI/ BLU to Snubber
	WHI/BLU to Relay
	WHI/BLK to Cordset
	(120V models)
	RED/BLK to Cordset
	(230V models)
	WHI/BLK to Snubber
	GRN to Chasis Ground
	YEL to Snubber
	FRANKLIN MOTOR
	WHI/BLK to Snubber
	YEL to Snubber
	WHI/ BLU to Snubber
	WHI/BLK to Cordset
	WHI/BLU to Relay
	GRN to Chasis Ground
	MARATHON MOTOR	P621
	FIG. 16 MOTOR WIRING
26	41545 122209