Bunn G9-2 HD-S - Manual (Page 12)

12
SERVICE (cont.)
Motor
Location:
The motor is located in the upper wrapper.
Test Procedure:
1. Remove the cover plate located on the right side
of the housing. Press the red “Reset” button vis-
ible through the opening. Listen carefully for a
“click”. This resets the motor protection circuit
and may indicate that something other than cof-
fee was inserted into the hopper for grinding.
If the grinder remains unable to start, proceed to #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. Unplug the grinder.
3. Remove the electrical access panel at the rear of
the motor.
4. Connect a voltmeter across terminals L1 & L2 of the
motor. Plug-in the grinder. Momentarily press the
Off/On/Start switch to the “START” (lower) posi-
tion and release. The indication must be 120 volts
ac for 120V models and 230 volts ac for 230V
models.
5. Unplug the grinder
If voltage is present as described and the grinder re-
mains unable to start, replace the motor.
If voltage is not present as described, refer to the
Wir-
ing Diagrams, and check the grinder wiring harness.
Removal and Replacement - MOTOR
1. Remove all wires from the solenoids and lift the
hopper assy out of the grinder housing.
2. Remove all wires from all switches, motor, and
motor mounting plate.
3. The entire wiring harness must be fed into the bot-
tom of the grinder housing through the hole in
the motor mounting plate.
4. Remove both 6-32 screws beneath the upper front
inspection panel.
5. Remove the six 10-32, slotted, hex head screws
on top of the motor mounting plate.
6. Slowly slide the assembly out the rear of the
grinder housing. The mounting plate may have to
be raised to gain clearance for the motor hard-
ware and wiring harness bushing.
7. Remove the four 5/16"-18 bolts and nuts to sepa-
rate the motor from the mounting plate.
8. Mount the new motor and tighten the four bolts
and nuts. They should be tightened approximately
one full turn past snug.
9. Slide the motor mounting plate into the rear of
the grinder housing.
10. Feed the wiring harness into the top of the hous-
ing through the hole in the motor plate.
11. Reinstall the six 10-32 hex head screws through
the motor plate and the two 6-32 slotted head
screws through the housing.
12. Reattach the green wire to the 10-32 stud on the
motor mounting plate.
13. Refer to the Off/On/Start Switch, Hopper Selector
Switch and Batch Selector Switch sections when
reconnecting the switch wires.
14. Refer to the Solenoid section when reconnecting
the solenoid wires.
15. Refer to the following illustration when reconnect-
ing the wires.
P607
10218 051603