Troubleshooting Mix Pump - Stoelting F431 Service Manual

7.5 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.
7. Defective toggle switch.
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.
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.
7. Check continuity; repair or replace.
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 4.9
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.
55
REMEDY