Troubleshooting - Mix Pump - Stoelting U431 I2 Owner's/Operator's Manual

5.4 TROUBLESHOOTING - MIX PUMP

PROBLEM
1 Power to pump is off.
2 Low voltage.
3 Mix pump hose jammed inside black
Pump motor does
not run.
4 Pump motor overloaded.
5 Pressure switch on pump is defective. 5 Check mechanical operation and continuity of
6 Defective motor/capacitor.
Note 1: A properly working pump will fi ll an 8 oz. cup with mix in about 9 seconds.
Note 2: Immediately after a bag change the pump may be unable to reestablish 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, remove as much air
from the mix bag as possible.
1 Out of Mix.
2 Mix pump hose kinked inside black
Pump operates but
cylinder will not fi ll.
3 Hoses assembled incorrectly.
4 Mix pump hose service life is
5 Mix pump hose not connected to
6 Ice crystals in mix.
7 Mix bag drawn against adapter.
8 Foreign objects in mix.
9 Check valve is backwards.
1 Overrun setting too low.
2 Air leak.
Overrun too low or
no overrun.
3 Air compressor not pumping air.
4 Air check valve in backwards.
Owner's Manual #513660
POSSIBLE CAUSE
cover/clamp.
cover/clamp.
exceeded.
machine.
1 Supply power to pump.
2 Check for low voltage.
3 Disconnect pump from power source. Remove
four cover/clamp thumb screws. Separate
cover/clamp halves and remove outer half.
Remove jammed hose. Clean and re-install
cover/clamp and tighten four thumb screws
securely. Allow motor thermal overload to
reset.
4 Allow internal thermal overload to reset;
determine overload cause and repair.
pressure switch.
6 Check motor amperage draw and/or capacitor.
Replace motor or capacitor.
1 Replenish mix supply.
2 Disconnect pump from power source. Remove
four cover/clamp thumb screws. Separate
cover/clamp halves and remove outer half.
Remove jammed hose. Clean and re-install
cover/clamp and tighten four thumb screws
securely. Allow motor thermal overload to
reset.
3 Refer to diagram for correct hose connections.
4 Reposition/replace mix pump hose. See
Section 4
5 Connect mix pump hose to machine.
6 Completely thaw mix prior to use.
7 Ensure bag is clear of pick-up tube.
8 Clear blockage. Use fresh mix.
9 Observe fl ow arrow for proper orientation.
1 Increase overrun setting.
2 Tighten all hose clamps.
3 Contact local Stoelting Distributor.
4 Check arrow for direction of fl ow.
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REMEDY
U431 I2 Model Machines