Stoelting U3-02 User manual

Model U3-02
OPERATORS MANUAL
Manual No. 513557

This manual provides basic information about the machine. Instructions and suggestions are
given covering its operation and care.
The illustrations and specifications are not binding in detail. We reserve the right to make
changes to the machine without notice, and without incurring any obligation to modify or pro-
vide new parts for machines built prior to date of change.
DO NOTATTEMPT to operate the machine until instructions and safety precautions in this
manual are read completely and are thoroughly understood. If problems develop or questions
arise in connection with installation, operation, or servicing of the machine, contact Stoelting.
Stoelting Foodservice Equipment
502 Highway 67
Kiel, WI 53042-1600
U.S.A.
Main Tel: [phone]
Fax: [phone]
Customer Service: 888.429.5920
Fax: [phone]
Email: [email protected]
© 2014 PW Stoelting, LLC
stoeltingfoodservice.com

Safety Alert Symbol:
This symbol Indicates danger, warning or caution.
Attention is required in order to avoid serious per-
sonal injury. The message that follows the symbol
contains important information about safety.
Signal Word:
Signal words are distinctive words used throughout
this manual that alert the reader to the existence and
relative degree of a hazard.
CAUTION
The signal word “CAUTION” indicates a potentially
hazardous situation, which, if not avoided, may result
in minor or moderate injury and equipment/property
damage.
A Few Words About Safety
Safety Information
Read and understand the entire manual before
operating or maintaining Stoelting equipment.
This manual provides the operator with information
for the safe operation and maintenance of Stoelting
equipment. As with any machine, there are hazards
associated with their operation. For this reason safety
is emphasized throughout the manual. To highlight
specific safety information, the following safety defini-
tions are provided to assist the reader.
The purpose of safety symbols is to attract your at-
tention to possible dangers. The safety symbols, and
their explanations, deserve your careful attention
and understanding. The safety warnings do not by
themselves eliminate any danger. The instructions
or warnings they give are not substitutes for proper
accident prevention measures.
If you need to replace a part, use genuine Stoelting
parts with the correct part number or an equivalent
part. We strongly recommend that you do not use
replacement parts of inferior quality.
WARNING
The signal word “WARNING” indicates a potentially
hazardous situation, which, if not avoided, may result
in death or serious injury and equipment/property
damage.
CAUTION
The signal word “CAUTION” not preceded by the
safety alert symbol indicates a potentially hazardous
situation, which, if not avoided, may result in equip-
ment/property damage.
NOTE (or NOTICE)
The signal word “NOTICE” indicates information or
procedures that relate directly or indirectly to the
safety of personnel or equipment/property.

TABLE OF CONTENTS
SECTION 1 — INTRODUCTION ............................................................................................................................ 1
1.1 Description ..................................................................................................................................................... 1
1.2 Specifications ................................................................................................................................................. 1
SECTION 2 — INSTALLATION INSTRUCTIONS................................................................................................... 3
2.1 Shipment and Transit ..................................................................................................................................... 3
2.2 National Sanitation Foundation Compliance Requirements............................................................................ 3
2.3 Installation ...................................................................................................................................................... 3
2.4 Mix Pump Check Out ..................................................................................................................................... 5
SECTION 3 — OPERATION INSTRUCTIONS ....................................................................................................... 7
3.1 SafetyPrecautions ......................................................................................................................................... 7
3.2 Pump Motor Switch ........................................................................................................................................ 7
3.3 Operation Of U3 Mix Pump............................................................................................................................ 7
3.4 Cleaning......................................................................................................................................................... 8
3.5 Disassembly and Inspection of Removable Parts.......................................................................................... 8
3.6 Sanitizing and Startup.................................................................................................................................... 9
3.7 CleaningMixLines ......................................................................................................................................... 9
SECTION 4 — MAINTENANCE INSTRUCTIONS ............................................................................................... 11
4.1 OverrunAdjustment .......................................................................................................................................11
4.2 PreventativeMaintenance ..............................................................................................................................11
SECTION 5 — TROUBLESHOOTING ................................................................................................................ 13
SECTION 6 — REPLACEMENT PARTS INFORMATION .................................................................................... 15
6.1 How to Order Replacement Parts................................................................................................................. 15
6.2 Parts List and Reference Drawings ............................................................................................................. 15

LIST OF ILLUSTRATIONS
Figure Description Page
1 U3 Pump ................................................................................................................. 1
2 Mix Transfer Line .................................................................................................... 3
A Mix Pump Hose ...................................................................................................... 4
B Pickup Hose ........................................................................................................... 4
C Pickup Hose ........................................................................................................... 4
3 Mix Pump Installation.............................................................................................. 5
D 4-wayTeeConnection ............................................................................................. 5
4 Pump Motor Switch................................................................................................. 7
5 Mix Pump Operation ............................................................................................... 8
6 Removing Parts ...................................................................................................... 8
7 Overrun Adjustment................................................................................................ 11
8 Reposition Mix Pump Hose..................................................................................... 12
9 Pump Roller Assembly............................................................................................ 12
10 Pump and Decal Assembly ..................................................................................... 15
ExplodedParts Illustrations..................................................................................... 17-21
WiringDiagram........................................................................................................ 23

1
1.1 DESCRIPTION
TheModelU3RemoteMixPumpisspeciallydesignedfor
usewithStoeltingremotepressurizedfreezers. Usedwith
largecapacitymixcontainerslocatedinyourbulkstorage
cooler, the U3 Pump keeps mix handling to a minimum.
Stoelting’s Model U3 Remote Mix Pump performs three
important functions with precision and reliability. First, it
transfers a continuous supply of mix from your remote
storagecontainertothefreezingcylinderofyourfreezer-
quickly, conveniently. Second, the U3 Pump precisely
injects a preset amount of air into the mix, maintaining
overruntoassuremaximumprofitability. Third,itpressur-
izesthefreezingcylinder,forcingfrozenproductthrough
the spigot at the rapid dispense rates needed by high
volumelocations.
SECTION 1
INTRODUCTION
1.2SPECIFICATIONS
WEIGHT
24 lbs. (10.89 kg)
DIMENSIONS
Width: 9-3/4" (24.8 cm)
Height: 8-1/2" (21.6 cm)
Depth: 10-1/8" (25.7 cm)
ELECTRICAL
1phase,120volts.Approximately1.6totalrunningamps.
Cordandplugattached.
WARRANTY
Oneyear parts.
UL,C-ULApproved,NSFApproved
Figure 1
U3 Pump

2

3
2.1 SHIPMENT AND TRANSIT
Themixpumphasbeencompletelyassembled,operated
and inspected at the factory. Upon arrival at the final
destination, the mix pump must be checked for any
damagethatmayhaveoccurredduringtransit.
Themixpumpshouldarriveinsatisfactorycondition. THE
CARRIER IS RESPONSIBLE FOR ALL DAMAGE IN
TRANSIT,WHETHERVISIBLEORCONCEALED. Donot
paythefreightbilluntilyouhavecheckedtheequipment.
Havethecarriernoteanyvisibledamageonthefreightbill.
Ifconcealeddamageand/orshortageisfoundlater,advise
the carrier inspector within 10 days and request inspec-
tion. Thecustomermustplaceclaimfordamagesand/or
shortages in shipment with the carrier. Stoelting, Inc.
cannot make any claims against the carrier.
2.2NATIONALSANITATIONFOUNDATION
COMPLIANCEREQUIREMENTS
Inordertocomplywith"NSFInternational"(NSF)code#6:
A. This unit (remote pump) must be installed with a
“NSF”listedrefrigerated mix transfer line.Themix
transfer line must be pitched to cooler, with no sags
or low points, to allow complete drainage (Fig. 2).
B. The product at the mix pump and in transfer lines
mustbemaintainedbelow 41°F (5°C.)
2.3 INSTALLATION
A. Follow the steps below to install the mix pump in an
uprightposition on the wallusingoptionalpump
mounting kit. Allow clearance for a mix container
underpump.See Figure 2.
1.Mount bylocatingfour (4) hole centersoncooler
wall using mounting bracket as template.
CAUTION
KNOW THE COOLER'S WALL DESIGN BEFORE
DRILLING TO PREVENT PERSONAL INJURY OR
PROPERTYDAMAGE.
2.Drill four (4)1/2inchdiameter holes intocooler
wall 3/4 inch deep. See Figure 3.
3.Insert well-nut toflangeandapplysilicone sealant
aroundoutsidediameterofflange and cooler wall.
4.Repeat steps 2 & 3 for other located hole centers.
5.Mount bracket to cooler wall with supplied wing
screws. Hand tighten until secure.
6.Thread plastic standoffs(smallpartsbag)onto all
threepump mounting studs locatedunderthe
pumpuntilbottomed.
7.Mount pump to bracket with wing nuts. Pump will
beheld above the bracketbythestandoffs.
SECTION 2
INSTALLATION INSTRUCTIONS
Figure 2
Mix Transfer Line
COOLERWALL 
PUMP

MIX
CONTAINER

REFRIGERATION
UNITFORMIXLINE

FREEZER

CHECK
VALVE

20 FT. MAXIMUM


10 FT. LIFT
MAXIMUM


4
B. Mix Pump Hose Installation.
Follow the steps below to install the mix pump hose.
1.Turnpumpon.
2. Feed one end of mix pump hose into the entering or
pick-up hose side (left) of black cover.
3.Gentlypushthehoseintotheblackcoveruntilitbegins
to feed. See Figure A.
Figure A
4. Allow the hose to feed itself thru the pump until 6"
remains on the entering side.
5.Turnpumpoff.
6. Connect mix pump hose to pickup hose adapter using
small hose clamp. See Figure B.
CAUTION: DO NOT TWIST MIX PUMP HOSE.
Figure B
Figure C
7.Turnpumpon.
8.Gentlypull on the dischargehosetohelpremaining6"
ofmixpumphosetofeedthrupumpuntilhoseadapter
preventsfurtherfeeding.
9.Turnpumpoff.SeeFigureC.

5
10. Connect free end of mix pump hose to "4 way Tee"
as shown in Figure D. When all connections are
complete the "4 way Tee" must be lower than the
black pump housing.
C. Connect 1/2 inch (1.27 cm) I.D. plastic food grade
tubing to the check valve and then to the mix con-
tainer.Observecheckvalveflow arrow.Securewith
hose clamps.
D. Connect 1/2inch (1.27 cm) IDplastic food grade
tubingbetween the large portofair/mixtee and
refrigeratedmixtransferline. Secure with large hose
clamporequivalent.
CAUTION
AIR/MIX TEE MUST REMAIN BELOW THE BLACK
COVER/CLAMP.IFTHETEEISABOVETHEPUMP MIX
WILLDRAINTOTHEAIRCOMPRESSORRESULTING
INPUMPDAMAGE.
E. Plug mix pump intoa115 volt grounded receptacle.
WARNING
TO MINIMIZE SHOCK HAZARD, THE REMOTE MIX
PUMP MUST BE PLUGGED INTO A PROPERLY
GROUNDEDELECTRICALRECEPTACLEWITHOUTTHE
USEOFAGROUNDADAPTERPLUG.
2.4 MIX PUMP CHECK OUT
Before using, the U3 Mix Pump should be thoroughly
cleaned.Thisisnecessarytoremoveanyforeign
materials that may be present.
A. The over-run adjustment ispreset atthe factory. If an
adjustment becomes necessary, refer to Section 4.1.
B. Check for air leaks by placing the suction line into
two gallons of cold water. Place the freezer switch in
the OFF position. Close the spigot and freezer air
vent. Place mix pump switch in the ON position and
allow the system pressure to build up and pump to
shutOFF automatically.Leave the pump onforten
minutes.
During this time, do not open spigot or freezer air
vent. If pump does not automatically start again
during this period, the system is free of leaks. If the
pump does start, there is a leak in the system.
Locateleak by applying aliquiddetergentor bubble
solution with a small brush to all tubing connections
ando-ringseals. Correct as required.
Figure 3
Mix Pump Installation
OPTIONAL
MOUNTING
KIT
Figure D
CHECKVALVE

Check
Valve

6

7
3.1 SAFETYPRECAUTIONS
Do not attempt to operate the U3 pump until the safety
precautionsandoperatinginstructionsinthemanualare
readcompletelyandthoroughlyunderstood.
Take notice of all warning labels on the U3 pump. The
labels have been put there to help in maintaining a safe
workingenvironment.Thelabelsaredesignedtowithstand
washing and cleaning. All labels must remain legible for
thelifeofthemixpump.Warninglabelsshouldbechecked
periodically to be sure they have not been removed,
paintedover,rubbedoff,andcanberecognizedaswarning
labels.
Ifreplacementlabelsareneeded,indicatethepartnumber,
typeoflabel,locationoflabel,andquantityrequired. Mail
your name and address to:
STOELTING,LLC
ATTENTION: CustomerService
502 Hwy 67
Kiel,Wisconsin 53042
Labelswill be furnished andmailedatnocharge.
SAFE OPERATION IS NO ACCIDENT; Observe these
rules:
A. Know the U3pump- readandunderstand the
Owner’sManual.
B. Wear proper clothing- avoid loose fittinggarments,
andremovewatches, rings or jewelry whichcould
cause a serious accident.
C. Maintaina cleanworkarea -avoidtripping orslipping
by cleaning up the area and keeping it clean.
D.Stay alert at all times - know which switch, push
button or control you are about to use and what effect
it is going to have.
E. Turn all switches to OFF prior to making any adjust-
ments.
F. Donotattemptto repair or perform maintenanceon
the mix pump until the main electrical power has
beendisconnected.
G.Do not operate the mix pump if unusual or
excessivenoiseor vibration occurs.
3.2 PUMP MOTOR SWITCH
The PUMP MOTOR switch (Fig. 4) is located on the mix
pumpassembly. When the pump motorswitchisplaced
intheONposition,themixpumpmotorwillbeactuatedto
pumpmixintothefreezercylinder. Whenthesetpressure
isreached,themixpumpwillshutoffautomatically. When
the pump motor switch is placed in the OFF position, the
mixpumpwillbeinoperative.
NOTE
The mix pump motor is equipped with an internal
overloadthat will “kick-out” whenthemotoris over-
loaded.Consultthetroubleshootingsectionforcor-
rective information.The internal overload will auto-
maticallyreset after cooling. Ifthecondition contin-
ues,contact a qualifiedservice person.
3.3 OPERATION OF U3 MIX PUMP
SECTION 3
OPERATION INSTRUCTIONS
Figure 4
Pump Motor Switch
ThissectiondescribestheoperationoftheU3mixpump.
NOTE
Mix pump hose must be repositioned every 1 -
2 weeks. Failure to comply will result in reduced
mixpump liquid capacity,dispense stoppage,pop-
ping,and possible mixpumphose leakage. Ref.to
Notefrom Section 4.2.
A. Refer tofreezerownersmanualfortheoperationof
thefreezer.
B. Mix Operation: The peristaltic mix pump contains
one continuous mix pump hose. When looking at the
face of the peristaltic mix pump, the left side of this
hose is the suction or pickup. The right side of the
hose is the discharge. Mix is drawn up the suction
sideofthe hose and transferredthruthedischarge
side to the freezer (Fig. 5).
C. AirOperation: The air compressoroperates concur-
rently with the peristaltic mix pump. Air enters thru
aninternalcheck valve on the pistondownstroke.
The air is discharged thru a second internal check
valve,andanexternalcheckvalve on the piston
upstroke. The air and mix join at the tee and then
traveltothefreezer.

8
Figure 5
Mix Pump Operation
ROLLER
COVER/CLAMP
4 WAY TEE
INLETSIDE
Figure 6
RemovingParts
MIXPILLOW
D.OverpressureRelief:Excesspressureisrelieved
backwards through the peristaltic mix pump and out
the pickup side of the mix pump hose. This will occur
only if the pressure switch fails to shut off the pump
motor.
3.4CLEANING
Themixpumpmustbecleanedwhenchanging mix or
wheneverthefreezerisshutoffforanextendedperiod,
suchasovernightoronnonbusinessdays. Forsanitary
reasons, mix must not be allowed to remain in the
freezer lines or mix pump when the freezer is not in
operation.
NOTE
Tocleanthefreezer,refertothefreezerowner’smanual
forcompletecleaning procedures.
1. Place the CLEAN-OFF-ONswitchinthe clean
positionandagitate5-10minutes maximum.
2. Remove suction tube from mix container. Draw off
the mix remaining in freezer barrel.
3. Pump 2 gallons (7.5 liters) of cold potable water thru
freezer until water at spigot is free of mix.
4. Pump 2 gallons (7.5 liters) of warm detergent solution
water thru freezer. The use of soft water is recom-
mended,alongwith dishwashing detergents such as
“Joy,” “Dawn,” or equivalent.
5. Place mix pump switch in OFF position. Open spigot
torelieve remaining pressure.
6. Place the CLEAN-OFF-ON switch in the OFF posi-
tion.
3.5 DISASSEMBLY AND INSPECTION OF
REMOVABLE PARTS
Inspection of removable parts should be made whenever
maintenance is performed or pump requires disassembly.
WARNING
THE MIX PUMP SWITCH MUST BE IN THE OFF
POSITION WHEN SERVICING OR DISASSEM-
BLING PUMP.
CAUTION
NEVER DISCONNECT HOSES FROM FREEZER
OR PUMP WITHOUT FIRST OPENING SPIGOT
TORELIEVEPRESSURE.

Check
Valve

9
NOTE
If the mix lines or air lines are difficult to remove,
soften with a rag soaked in hot water. Hose con-
nectionsmay be sprayed withHaynesSanitaryLu-
bricant for ease of removal. Do not loosen or re-
move the mix pump cover wingnuts. Maintain the
mix pump hose in its operational condition.
1. Loosenclampandremoveairhose.
2. Removethetwowingnutsfrom the pressure control
manifoldandpulloutto remove.
3. Loosen clamp and disconnect mix pump hose.
Removethepickuphose, check valve and pickup
hoseadapter(andbag adapter if applicable) asan
assembly from mix container.
4. Completelydisassemblebothhoseassemblies and
checkvalve. Place hoses, pressure control manifold
ando-ring,tee, check valve, and pickuphoseadapter
inmild detergent water andwashthoroughly. Use soft
bristle brushes to clean inside of fittings. Rinse all
parts in clean hot water.
5. Carefullyinspecteachpartforwearor damage.
Replacewornordamagedparts.
6. Preparetwogallons(7.5 liters) of sanitizingsolution
usinga USDA certifiedgradesanitizing solution.
Sanitize all removed parts, then air dry.
7. Check Hose Service Record decal to determine if
hose reposition or replacement is required at this time
(Sec. 4.2).
8.Reassemble both hose assembliesperthediagram
(Fig.6).Lubricatethepressure control manifold oring
withsanitary lubricant before assembly. Reconnect
assemblies to the pump and discharge hose per the
diagram, using the clamps, locking plate washer and
wingnuts.
CAUTION
DO NOT FORCE PARTS, THEY FIT TOGETHER
EASILY WHEN PROPERLY INSTALLED.
3.6 SANITIZINGANDSTARTUP
Forsanitizingtobeeffective,itmustbeperformedafterthe
mix pump and freezer parts have been cleaned, and just
prior to filling the freezer with mix. Sanitizing the night
beforeisnoteffective.
Tosanitize,refertolocalsanitaryregulationsforapplicable
codesandrecommendeddisinfectingproductsandproce-
dures. The frequency of cleaning must comply with local
healthregulations.Useasolutioncontaining100PPMof
free available chlorine. Use “Stera-Sheen Green Label
Sanitizer and Cleaner," or others in accordance with
HealthInspectionRequirements.
NOTE
Stoelting, Inc. has found that STERA-SHEEN
GREENLABEL SANITIZER ANDCLEANERdoes
aneffectivejobofproperlysanitizingandcleaninga
pumpand soft servefreezer. We thereforeinclude
a sample with each new freezer. For further infor-
mation read the directions on the packet. Other
productsmay be aseffective.
CAUTION
PROLONGEDCONTACTOFSANITIZERWITHFREEZER
MAY CAUSE CORROSION OF STAINLESS STEEL
PARTS.
In general, sanitizing may be conducted as follows:
1. Preparetwogallons(7.5 liters) of sanitizingsolution
followingmanufacturer’sinstruction,andplacepump
suction (inlet) line into solution.
2. Place mix pump switch in ON position.
3. Checkforleakswhenfreezer barrel is firstpressur-
ized with sanitizing solution.
4. PlacefreezerCLEAN-OFF-ONswitchinCLEAN
mode(norefrigeration).
5. AfterfiveminutesinCLEAN mode, open spigot and
pumpthe remaining sanitizing solutionthruthe
freezer,close spigot and switchthefreezerandpump
to OFF.
6. Place pickup tube into mix bag or container of mix
and start the pump.
7. Openspigot,allowing incoming mixtopush remain-
ingsanitizer out ofhoses and freezing cylinder.
Close spigot as soon as pure mix begins to come out
(afteraboutonepint).
8. Pushintheairbleed valve located on thefrontdoor
(ChallengerSeries) and allowthemixto come within
1/2"oftheair bleed valve, then close thevalve.
9. Place freezer in the on or freezing position.
3.7 CLEANING MIX LINES
The mix lines must be cleaned and sanitized whenever
changingmixorwheneverthefreezerisoffforanextended
period of time - such as overnight, or nonbusiness days.
Themixlinesaresufficientlycleanedandsanitizedwhen
cleaning and sanitizing the pump and freezer as an
assembly.
Once every 2 weeks, if required, perform the following
steps:

10
A. Mix 2 gallons (7.5 liters) of milkstone remove solution
according to the directions on the container and pump
through the mix line.
B. Cut a piece of sponge slightly larger than the inside
diameter of the mix line. Place the sponge inside the
mix line and force through with tap water pressure. A
garden hose repair end clamped to the mix line works
wellfor this purpose.

11
4.1 OVER-RUNADJUSTMENT
Theproductwhenservedisacombinationofairandmix.
Over-runisameasureoftheamountofairblendedintothe
mix.
Over-run can be expressed in terms of the amount of
weight loss for a given volume. For example, if a pint of
liquid mix weighs 18 ounces and a pint of frozen product
withairaddedweighs12ounces,theover-runissaidtobe
50 percent (18 oz. - 12 oz. = 6 oz., (6 /12) x 100 = 50%.
The over-run can be checked by placing a one pint
containeronanicecreamscaleandzeroingoutthescale.
Then fill a one pint container with frozen product. The
container should be filled over the top and leveled with a
straightedge. The product should not contain any air
pockets. When weighed on an ice cream scale, one pint
of product should weigh 12 to 13 ounces.
Themixpumphasbeenpresetatthefactorytoproducea
product with approximately 40% overrun. Because of
differencesinmixformulation,temperaturesandbaromet-
ricpressure,thisfiguremayvary. Itwillbenecessaryfor
approximately 2 gallons of mix to be pumped thru the
freezerbeforechangesintheproductarenoticeabledue
toadjustmentsinoverrun.
Overrun is controlled by the length of the air compressor
piston stroke within the piston cylinder. Lengthening the
stroke within the cylinder will increase overrun. Con-
versely, shortening the stroke will decrease overrun. To
perform an overrun adjustment, refer to the following
procedure:
A. Turn the mix pump switch to the OFF position and
unplugthe mix pump from itsgrounded115Vrecep-
tacle.
B. Remove the2electricalboxcover screwsand remove
theelectrical box cover.
C. On air compressor side of pump, locate the long/
slender piston rocking arm. The rocking arm down-
ward travel is limited by a stationery cam. On the
face of the cam there is an overrun setting indicator
plate numbered 3 thru 8 and an adjustment knob
(Fig. 7).
D. The overrunsettingis indicatedby apointed pin.
E. Toadjust overrun,loosen the allenheadscrew
(locatedwithin the centeroftheadjustment knob)
withthe5/32" allen wrench provided. Rotate the
adjustmentknob counterclockwise to ahigher
numberforhigheroverrun,or clockwise to a lower
numberforloweroverrun.Eachnumbermultipliedby
10representsthe overrun percentage (ie: #4 =40%
overrun).
SECTION 4
MAINTENANCE INSTRUCTIONS
Figure 7
OverrunAdjustment
F. Tighten the allen screw, then place the wrench back
in its clip. Replace the electrical box cover and
screws, plug the mix pump into its grounded 115V
receptacle and turn the mix pump power switch to the
ONposition.
4.2 PREVENTATIVEMAINTENANCE
Toassuretroublefreeoperationandconsistentover-run
when using the U3 mix pump, we must follow mix hose
repositioningandreplacementprocedures.Thefollowing
isthepreventativemaintenanceschedule:
A.MIXPUMPHOSEREPOSITION(everyoneortwo
weeks.)
NOTE
Mix pump hose must be repositioned every 1 - 2
weeks. Failure to comply will result in reduced mix
pumpliquid capacity,dispensestoppage,popping,
and possible mix pump hose leakage.
1.Runcleaning solution through pump.
2.Turnpumpoffand if connected tofreezer,relieve any
pressureby opening the spigot.
3. Grasp the pick-up hose end of the mix pump hose
with one hand and turn the pump on. Pull down on the
pick-up hose end until 12 to 14 inches of tubing has
reversedfedthroughthepump, then turn the pump
off.
4. Loosen small clamp at the pick-up hose adapter and
disconnect mix pump hose.
5. Cut 7-1/2 inches off the end of the mix pump hose.
The height of the pump can be used to measure. See
Figure8.
OVERRUN
ADJUSTMENT


12
6. Reconnect mix pump hose to adapter.
7.Turnpumpon.
8. Gently pull on the discharge hose to help remaining
6" of mix pump hose to feed thru pump until hose
adapterpreventsfurtherfeeding.
9. TurnpumpOFFandpumpwillbe ready for normal
operation.
NOTE
Each hose is long enough for 3 repositions before
replacementisrequired.RecordeacheventonHose
ServiceRecorddecal.
B.MIXPUMPHOSE REPLACEMENT
NOTE
Mixpumphosemustbereplacedwhentubingcan-
not be further repositioned (every four to eight
weeks).Failure to complywillresultin hose failure
andpossible pump damage.
1.Runcleaning solution through pump.
2.Turnpumpoff and if connected to freezer relieveany
pressureby opening the spigot.
WARNING
THE MIX PUMP SWITCH MUST BE IN THE "OFF"
POSITIONWHENSERVICINGORCLEANINGPUMP.
CAUTION
NEVER DISCONNECT HOSES FROM FREEZER OR
PUMP WITHOUT FIRST OPENING SPIGOT TO RE-
LIEVEPRESSURE.
3. Disconnect mix pump hose at each end.
4.Grasp the dischargehoseend with onehand and turn
the pump on. Pull down on the hose until all of the
remaininghoseisremovedfrom the pump.
Pressures for Stoelting Freezers: Cut-out 24# ±3 PSIG
For Duke Freezers: Cut-out 30# ±3 PSIG
19
ROLLER
DISCHARGESIDE
COVER/CLAMP
PICKUP
SIDE


CUTLINE
MEASUREMENT
MIXPILLOW
Figure 8. Reposition Mix Pump Hose
5. Turn pump roller assembly so one roller is at 6:00.
4 WAY TEE
20
6. Use a brush that fits in the opening and brush up and
down,firstwith detergent water and thenclearwater.
7. Connect mix pump hose to pick-up hose adapter,
using small clamp.
8. Insert free end of hose into the pick-up (suction side)
hose side of the black cover. Gently push the hose
into the black cover until it begins to self-feed. Allow
the hose to feed itself through the pump until the mix
pump hose comes out the discharge side. Then gently
pull on the discharge hose to help remaining mix
pumphosefeedthrupump until hose adapter prevents
furtherfeeding,thenturnpumpoff.
NOTE
Removecoverclampfrom pump on a monthly basis
to clean and check for wear. (Cover clamp & roller
bearings) Clean parts with soap and water and re-
assemble.
9. Reconnect mix pump hose to T using small clamp.
Pump is now ready to sanitize.
Figure 9. Pump Roller Assembly
R
oller
Cover/Clam
p
Inlet
Side Discharge
Side
Cover/Clamp
Discharge Side
Inlet
Side
Roller

13
SECTION 5
TROUBLESHOOTING
1. PUMP MOTOR DOES NOT RUN
Power to pump is off. Supply power to pump.
Low voltage. Check for low voltage.
Mixpump hose jammed inside black cover/clamp. Disconnect pump from power source. Remove four
cover/clamp thumb screws. Separate cover/clamp halves
and remove outer half. Remove jammed hose. Re-install
cover/clamp and tighten four thumb screws securely.
Allow motor thermal overload to reset. See Sec. 4.2 for
hose replacement. Do not use jammed portion of hose.
Pump motor overloaded. Allow internal thermal overload to reset; determine
overload cause and repair.
Pressure switch on pump is defective. Check mechanical operation and continuityof pressure
switch.
Defective motor/capacitor Check motor amperage drawand/or capacitor. Replace
motor or capacitor.
Defective toggle switch. Check continuity; repair or replace.
2. PUMP OPERATES BUT CYLINDER WILL NOT FILL
NOTE 1: A PROPERLY WORKING PUMP WILL FILL AN 8 OZ. CUP WITH MIX IN ABOUT 9 SECONDS.
NOTE 2: IMMEDIATELYAFTER A "BAG CHANGE" THE PUMP MAY BE UNABLE TO RE-ESTABLISH IT'S PRIME WITH
THE SYSTEMAT OPERATING PRESSURE.IN THIS CASE, TURN THEPUMP OFF.DRAW 2-3 PINTS TO REDUCE
SYSTEMPRESSURETOZERO. TURNPUMP ON. PURGEREMAINING AIR IN MIX BAG AND PICK-UPHOSE.
IMPORTANT: Before connecting the pick-up hose to the mix bag, purge the mix bag of air to the extent
possible.
Out of Mix. Replenish mixsupply.
MIxpump hose kinked inside black cover/clamp. Followmixpump hose jammed repair. (See #1 above.)
Hoses assembled incorrectly. Refer to diagram for correct hose connections.
Mixpump hose service life is exceeded. Reposition/replace mix pump hose. See Sec. 4.2.
Mixpump hose notconnected to freezer. Connect mixpump hose to freezer.
Ice crystals in mix. Completely thaw mixprior to use.
Mixbag drawn against adapter. Assure bag is clear of pick-up tube.
Foreign objects in mix. Clear blockage. Use fresh mix.
Check valve is backwards. Observe flow arrow for proper orientation.
3. OVERRUN TOO LOW OR NO OVERRUN
Overrun setting too low. Increase overrun setting.
Air leak. Tighten all hose clamps.
Air compressor not pumping air. Contact local Stoelting Distributor.
4.OVERRUN TOO HIGH
Mixpump hose service life is exceeded. Reposition/replace mixpump hose.
Out of mix. Replenish mixsupply.
Overrun setting too high. Decrease overrun setting.
Pick-up leg of mix pump hose is collapsing. See Section 4.2.
NOTE: ALSO SEE "2" ABOVE.

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5. REPLACEMENT MIX PUMP HOSE WON'T FEED THROUGH PUMP
Feeding hose into discharge hole of mixpump 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 mixpump hose.
Mixpump hose service life is exceeded. Reposition/replace mixpump 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.
Mixpump hose service life is exceeded. Remove mixpump hose. Disconnect pump from power
source. Remove mixpump 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 MIXPUMP HAS THREE SQUEEZE ROLLERS WHICH USESELF LUBRICATING BEARINGS. IF
SQUEAKING EXISTS WITH THEMIXPUMP 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 PUMPFROM ELECTRICAL POWER.REMOVEFOUR COVER/CLAMP THUMBSCREWS.REMOVEENTIRE
COVER/CLAMP ASONE UNIT. SPRAYSILICONE 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/mixtee above black cover/clamp. Air/mixtee 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.