Vollrath F431 - Manual (Page 39)

33
PROBLEM POSSIBLE CAUSE REMEDY
Overrun too high.
1. Mix pump hose service life is
exceeded.
1. Reposition/replace mix pump hose.
2. Out of mix. 2. Replenish mix supply.
3. Overrun setting too high. 3. Decrease overrun setting.
4. Pick-up leg of mix pump hose is
collapsing.
4. Reposition hose.
Replacement mix
pump hose won’t
feed through pump.
1. Feeding hose into discharge hole of
mix pump cover.
1. Feed hose into suction side of cover.
2. Hose ends not cut squarely. 2. Carefully cut hose end off squarely (no tails).
3. Force feeding too quickly. 3. Gently and slowly assist feeding of hose up
into pick-up hose side of cover.
4. Pump motor not running. 4. Turn on motor switch.
Air exiting mix pick-
up hose. 1. Pickup tube check valve missing. 1. Contact local Stoelting Distributor.
Dispensed product
air “pops”
1. Overrun setting too high. 1. Decrease overrun setting.
2. Mix pump hose service life is
exceeded.
2. Reposition/replace mix pump hose.
3. Overdrawing the machine’s capacity. 3. Reduce dispense rate.
4. Recent low mix condition. 4. Open spigot fully and allow excess air to
escape.
Mix leakage from
pump.
CAUTION: To prevent mix pump damage from dried mix deposits, immediately
disassemble and clean pump.
1. Mix pump hose service life is
exceeded.
1 Remove mix pump hose. Disconnect pump
from power source. Remove mix pump cover/
clamp. Clean the rollers a small amount of
soapy water. Clean mix from pump. See
Section 4.2 for hose replacement.
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.
Mix in air hoses.
1. Air/mix tee above black cover/clamp. 1. Air/mix tee must be below black cover/clamp.
2. Air leak. 2. Tighten all hose clamps.
3. Mix hose on wrong air/mix tee fi tting. 3. Refer to diagram for correct hose connections.
4. Pressure control manifold o-ring leak. 4. Check o-ring and manifold; replace as
required.