Motor - Bunn LPG Operating & Service Manual

SERVICE (cont.)

Motor

FIG. 11 MOTOR
Location:
The motor is located inside the hopper assembly.
Test Procedures:
1. Disconnect grinder from the power supply.
2. On Model LPG-2E, disconnect the black wire and
the white wire to the motor from the main wiring
harness, the red wire to the circuit breaker and the
red wire to the Off/On/Start switch. On Model LPG
disconnect the motor wiring harness from the
main wiring harness.
3. Connect the leads of an ohm meter to the red wires
from the motor.
If continuity is present the overload is good.
If continuity is not present the overload will not reset,
replace the motor.
4. Set an ohm meter to read at least 20 ohms.
Connect the leads from the ohm meter to the black
wire and the white from the motor. The ohm
reading should be approximately 18 ohms. Using
the bean agitator slowly rotate the motor shaft in
approximately 1/8 turn steps through one full
rotation. If ohm readings are consistent motor
windings are good. If readings vary more than ±1
ohm, replace motor.
NOTE: Clean all grind burrs and mounting surfaces
before reassembly.
Removal and Replacement:
1. On Model LPG-2E, disconnect the black wire and
the white wire to the motor from the main wiring
harness, the red wire to the circuit breaker and the
red wire to the Off/On/Start switch. On Model LPG
disconnect the motor wiring harness from the
main wiring harness.
2. On Model LPG-2E, disconnect the red wire from
the left and right solenoid, the orange wire from
the left solenoid and the violet wire from the right
solenoid.
P1022
3. Refer to Fig 12. Remove the three #10-32 x .25"
screws (1) securing the motor to the motor sup-
port bracket.
4. Remove the motor, solenoid and solenoid compo-
nents (2) from the hopper housing (3) as an
assembly.
NOTE: Steps 5 thru 14 apply only to Model LPG-2E.
5. Refer to Fig.13. Remove the three #8-32 Keps
nuts.
6. Lift the retaining ring w/hopper gasket (1) over the
motor and burr housing assembly (9). Set aside
for reassembly.
7. Remove the filler plate (2) and set aside for reas-
sembly.
8. Lift slide plate, solenoid plunger and spring (3) off
of the dowel pin in the mounting ring (6) and slide
solenoid plunger and spring (3) out of solenoid
coil. Set aside for reassembly. Repeat for opposite
side.
11
FIG. 12 MOTOR REMOVAL
2
3
1
P1049
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