Magnetic Lock; Evaporator Assembly; Refrigeration Test - Grindmaster D-15 Service Manual

MAGNETIC LOCK

Magnetic Lock Problems
If a unit is not spraying, check the following:
a) The impeller must spin freely when the bearing sleeve is held between
the thumb and the forefinger,
b) The impeller should turn when assembled and the motor switch is
turned "ON".
c) The pump motor runs without the impeller in place.
d) The air-gap between the drive magnet and the impeller is too great,
causing a loss of "magnetic lock".
NOTE: When adjusting the drive magnet on the pump motor shaft, place
the drive magnet assembly as high as possible and still leave 1/16" clear-
ance between the magnet and the underside of the top tray. The spacers on the motor bracket may be removed first
for easier access.
Magnetic Lock Adjustment
1. Remove the pump motor assembly from the unit by loosening the (2) pump motor bolts with a 7/16 wrench. (To
remove the left pump motor assembly on a D25, you will have to remove the (2) bolts that connect the frame to
the top tray on the left side and raise the frame slightly to slide the motor out.)
2. With a 3/32 Allen Wrench, loosen the (2) set-screws on the drive magnet and raise the magnet. The magnet
should be as close as possible to the evaporator cover without rubbing. Tighten the set-screws and replace the
pump motor assembly.
TOP TRAY ASSEMBLY STEPS (EVAPORATOR ASSEMBLY)
1. Unplug the unit.
2. Remove all panels.
3. Remove 4 tray mounting bolts in upper corners.
4. Evacuate refrigerant.
5. Disconnect pump motor wires.
6. Unsolder suction line and capillary tube.
7. Replace filter drier.
8. Swap pump motor assemblies to new evaporator assembly.
9. Reassemble.
10. Evacuate and charge system.

REFRIGERATION TEST

2. Turn unit ON - if
refrigeration is OK
a frost pattern will
form in less than 5
minutes.
Crathco® Beverage Dispensers
THIS IS A TRIAL AND ERROR ADJUSTMENT
GUIDE PIN BEARING SLEEVE
IMPELLER
STAINLESS TOP
TRAY
3/32" ALLEN SET
SCREW
PUMP
MOTOR
NUT
Figure N
1. Add water to well.
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