67
Model C602
Troubleshooting
Air Mix Pump System Troubleshooting
PROBLEM PROBABLE CAUSE REMEDY
1. Air/mix pump will not operate in
the AUTO mode when the draw
valve is opened.
a. Pump drive is out on reset. a. Allow the unit to cool and press
the reset button.
b. Malfunctioning interface board. b. Replace interface board.
c. Faulty pump motor. c. Replace motor.
d. Faulty connection or draw switch. d. Check connections or replace
switch.
2. Piston travels back and forth,
but the product is not being
pumped.
a. Gasket was installed incorrectly,
fits loosely, has holes, or was
lubricated.
a. Inspect gasket.
b. O-rings are worn, torn or fit too
loosely.
b. Inspect o -rings.
c. Piston and valve body cap must
be assembled correctly and fit
snugly in the pump cylinder.
c. Check the pump cylinder for
proper assembly and position.
d. Missing or defective check ring. d. Replace the check ring.
3. Excessive pump cylinder wear. a. Inadequate or incorrect lubrication
of the pump cylinder.
a. Lubricate properly .
b. Ball crank rotates clockwise. b. Rewire the ball crank rotation to
rotate counterclockwise.
4. Too much pressure in the
freezing cylinder.
a. Plugged relief hole in the feed
tube.
a. Clean the relief hole in the feed
tube.
5. Not enough pressure in the
freezing cylinder.
a. Weak, damaged or missing check
ring.
a. Replace or install the check ring.
b. Malfunctioning draw switch. b. Reposition or replace the
microswitch.
6. One pump c annot be assembled. a. Soft serve and shake pump parts
are mixed up.
a. Consult the operator’s manual for
correct pump assembly
combinations.
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