Vollrath U421 Water Cooled - Manual (Page 33)

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5. REPLACEMENT MIX PUMP HOSE WON'T FEED THROUGH PUMP
Feeding hose into discharge hole of mix pump cover. Feed hose into pick-up side of cover.
Hose ends not cut squarely. Carefully cut hose end off squarely (no tails).
Force feeding too quickly. Gently and slowly assist feeding of hose up into pick-up
hose side of cover.
Pump motor not running. Turn on motor switch. Also see Item 1 above.
6. AIR EXITING MIX PICK-UP HOSE
Pickup tube check valve missing. Contact local Stoelting Distributor.
7. DISPENSED PRODUCT AIR "POPS"
Overrun setting too high. Reposition/replace mix pump hose.
Mix pump hose service life is exceeded. Reposition/replace mix pump hose.
Overdrawing the freezer's capacity. Reduce dispense rate.
Recent "mix-out" condition. Open spigot fully and allow excess air to "belch" out.
NOTE: ALSO SEE 2 & 4 ABOVE.
8. MIX LEAKAGE FROM PUMP
CAUTION: To prevent mix pump damage from dried mix deposits, immediately disassemble and clean
pump.
Mix pump hose service life is exceeded. Remove mix pump hose. Disconnect pump from power
source. Remove mix pump cover/clamp. THOROUGHLY
rinse three squeeze rollers using a spray bottle filled with
hot water. Thoroughly clean all mix from pump. See Sec.
4.2 for hose replacement. Lubricate squeeze roller
bearings, see Item #10 below.
9. PUMP HAS POOR CAPACITY
Lift and run limits are exceeded. Pump is limited to 10' lift, 20' run.
NOTE: Also see 2, 4, 6 & 7.
10. PUMP IS NOISY/SQUEAKING
NOTE: THE ACTION OF THE AIR COMPRESSOR ROCKING ARM CREATES A REPETITIVE CLICKING SOUND DURING
OPERATION. THIS IS NORMAL.
NOTE: THE PERISTALTIC MIX PUMP HAS THREE SQUEEZE ROLLERS WHICH USE SELF LUBRICATING BEARINGS. IF
SQUEAKING EXISTS WITH THE MIX PUMP HOSE IN PLACE, AND STOPS WITH THE HOSE REMOVED, THE SQUEEZE
ROLLER BEARINGS CAN BE LUBRICATED USING A SILICONE BASED SPRAY. REMOVE THE MIX PUMP HOSE.
DISCONNECT PUMP FROM ELECTRICAL POWER. REMOVE FOUR COVER/CLAMP THUMBSCREWS. REMOVE ENTIRE
COVER/CLAMP AS ONE UNIT. SPRAY SILICONE BASED LUBRICANT ON EACH END OF EACH SQUEEZE ROLLER.
SPIN ROLLERS TO WORK LUBRICANT INTO BEARINGS. REPEAT AS NEEDED.
CAUTION: DO NOT USE CLEANING/DISSOLVING TYPE LUBRICANTS LIKE WD-40. THESE LUBRICANTS
ARE NOT BEARING FRIENDLY AND WILL ACCELERATE BEARING WEAR.
11. MIX IN AIR HOSES
Air/mix tee above black cover/clamp. Air/mix tee must be below black cover/clamp.
Air leak. Tighten all hose clamps.
Mix hose on wrong air/mix tee fitting. Refer to diagram for correct hose connections.
Pressure control manifold o-ring leak. Check o-ring and manifold; replace as required.