Stoelting F431 Service Manual page 64

PROBLEM
1. Mix pump hose service life is
2. Out of mix.
Overrun too high.
3. Overrun setting too high.
4. Pick-up leg of mix pump hose is
1. Feeding hose into discharge hole of
Replacement mix
2. Hose ends not cut squarely.
pump hose won't
3. Force feeding too quickly.
feed through pump.
4. Pump motor not running.
1. Pickup tube check valve missing.
Air exiting mix pick-
up hose.
1. Overrun setting too high.
2. Mix pump hose service life is
Dispensed product
air "pops" 3. Overdrawing the machine's capacity. 3. Reduce dispense rate.
4. Recent low mix condition.
CAUTION: To prevent mix pump damage from dried mix deposits, immediately
disassemble and clean pump.
1. Mix pump hose service life is
Mix leakage from
pump.
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 that 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 is noisy/
pump hose. Disconnect pump from electrical power. Remove four cover/clamp thumbscrews.
squeaking.
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.
1. Air/mix tee above black cover/clamp. 1. Air/mix tee must be below black cover/clamp.
2. Air leak.
3. Mix hose on wrong air/mix tee fi tting. 3. Refer to diagram for correct hose connections.
Mix in air hoses.
4. Pressure control manifold o-ring leak. 4. Check o-ring and manifold; replace as
POSSIBLE CAUSE
exceeded.
collapsing.
mix pump cover.
exceeded.
exceeded.
1. Reposition/replace mix pump hose.
2. Replenish mix supply.
3. Decrease overrun setting.
4. Reposition hose.
1. Feed hose into suction side of cover.
2. Carefully cut hose end off squarely (no tails).
3. Gently and slowly assist feeding of hose up
into pick-up hose side of cover.
4. Turn on motor switch.
1. Contact local Stoelting Distributor.
1. Decrease overrun setting.
2. Reposition/replace mix pump hose.
4. Open spigot fully and allow excess air to
escape.
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.
2. Tighten all hose clamps.
required.
56
REMEDY