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1. PUMP MOTOR DOES NOT RUN
Power to pump is off.
Low voltage.
Mix pump hose jammed inside black cover/clamp.
Pump motor overloaded.
Pressure switch on pump is defective.
Defective motor/capacitor
Defective toggle switch.
2. PUMP OPERATES BUT CYLINDER WILL NOT FILL
NOTE 1: A PROPERLY WORKING PUMP WILL FILL AN 8 OZ. CUP WITH MIX IN ABOUT 9 SECONDS.
NOTE 2: IMMEDIATELY AFTER A "BAG CHANGE" THE PUMP MAY BE UNABLE TO RE-ESTABLISH IT'S
PRIME WITH THE SYSTEM AT OPERATING PRESSURE. IN THIS CASE, TURN THE PUMP OFF. DRAW 2-3
PINTS TO REDUCE SYSTEM PRESSURE TO ZERO. TURN PUMP ON. PURGE REMAINING AIR IN MIX BAG
AND PICK-UP HOSE.
IMPORTANT: Before connecting the pick-up hose to the mix bag, purge the mix bag of air to the extent
possible.
Out of Mix.
MIx pump hose kinked inside black cover/clamp.
Hoses assembled incorrectly.
Mix pump hose service life is exceeded.
Mix pump hose not connected to freezer.
Ice crystals in mix.
Mix bag drawn against adapter.
Foreign objects in mix.
Check valve is backwards.
3. OVERRUN TOO LOW OR NO OVERRUN
Overrun setting too low.
Air leak.
Air compressor not pumping air.
4. OVERRUN TOO HIGH
Mix pump hose service life is exceeded.
Out of mix.
Overrun setting too high.
Pick-up leg of mix pump hose is collapsing.
NOTE: ALSO SEE "2" ABOVE.
SECTION 5
TROUBLESHOOTING
Supply power to pump.
Check for low voltage.
Disconnect pump from power source. Remove four
cover/clamp thumb screws. Separate cover/clamp halves
and remove outer half. Remove jammed hose. Re-install
cover/clamp and tighten four thumb screws securely.
Allow motor thermal overload to reset. See Sec. 4.2 for
hose replacement. Do not use jammed portion of hose.
Allow internal thermal overload to reset; determine
overload cause and repair.
Check mechanical operation and continuity of pressure
switch.
Check motor amperage draw and/or capacitor. Replace
motor or capacitor.
Check continuity; repair or replace.
Replenish mix supply.
Follow mix pump hose jammed repair. (See #1 above.)
Refer to diagram for correct hose connections.
Reposition/replace mix pump hose. See Sec. 4.2.
Connect mix pump hose to freezer.
Completely thaw mix prior to use.
Assure bag is clear of pick-up tube.
Clear blockage. Use fresh mix.
Observe flow arrow for proper orientation.
Increase overrun setting.
Tighten all hose clamps.
Contact local Stoelting Distributor.
Reposition/replace mix pump hose.
Replenish mix supply.
Decrease overrun setting.
See Section 4.2.
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