Gear Motor; Shaft Seal Installation And Replacement (See Figure 7.); Figure 7. Imd 300 Shaft Seal; Figure 8. Auger And Extruding Head Removal - Cornelius IMD Series Installation Manual

6. Recharge unit with refrigerant per nameplate.
7. Turn power and water On to unit.
8. With unit running adjust modulating valve to proper setting.
9. Go through a complete system check.

GEAR MOTOR

The gear motor is equipped with a start relay and a manual reset overload. When current is applied, the relay
energizes and completes the circuit to the start winding. The motor reaches a predetermined speed and the
relay drops out, disconnecting the start winding. The run winding remains in the circuit as long as current is ap-
plied.
The purpose of the overload is to automatically shut off the motor in the event of a mechanical bind of the trans-
mission, an overload condition within the evaporator or an electrical malfunction. It does this by sensing amper-
age draw. If the motor stalls the start relay would energize and stay energized. The amperage would surge to 5
to 6 times greater than normal draw. In this event the overload would shut off the transmission in 4 to 8 seconds.
If the motor is subjected to an abnormal load, but does not reach stall condition, the overload will react, but over
a greater period of time. The reaction time depends upon the amperage to which it is subjected.
The overload, through the safety circuit, also shuts off the compressor.
Refer to Troubleshooting Guide.
E- - RING
WASHER, PLAIN FLAT
SHAFT SEAL
LOCATOR SEAL
GEARMOTOR

FIGURE 7. IMD 300 SHAFT SEAL

SHAFT SEAL INSTALLATION AND REPLACEMENT (SEE FIGURE 7.)

1. Place shaft seal locator seat over gear motor output shaft, embossed side down, and push down until shaft
seal seat rests flush on top of gear motor.
2. Place rubber coated ceramic seal (important: ceramic face up) over output shaft and push down until seal
rests on top of the shaft seal seat. (Lubricate rubber on ceramic seal with [#06195] rubber lubricant.)
3. Place shaft seal with carbon face down(spring up) over output shaft and push (gently) downward until seal
rests on carbon face of the output shaft seal.
4. Push down on the washer compressing the spring on the output shaft seal. While holding the seals (down)
in place slide the E--ring into the groove on the output shaft.
638085277
BEARING DELRIN
COLLAR WITH
ANTI- - ROTATION RIB

FIGURE 8. AUGER AND EXTRUDING HEAD REMOVAL

14
AUGER NUT
BEARING NYLON
GROOVE
EXTRUDING
HEAD
AUGER
"D" DRIVE