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U3-02A Mix Pump
Owner's/Service Manual
Manual No. 513606 Rev. 0, April, 2004
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INTRODUCTION
U3-02A MIX PUMP - OWNER'S / SERVICE MANUAL
This manual provides basic information about the mix pump and its components. Instructions and suggestions are
given covering its basic operation and care.
The illustrations and specifications are not binding in detail. We reserve the right to make changes at any time without
notice to mix pump or components without incurring any obligation to equip same on mix pump built prior to date of
change.
DO NOT ATTEMPT to operate the mix pump until instructions and safety precautions in the manual are read completely
and thoroughly understood. The mix pump should be operated only by qualified personnel. If problems develop or
questions arise in connection with the installation, operation, or servicing of the mix pump, contact your local distributor
or the company at the following location:
STOELTING, LLC Ph: 920-894-2293
502 HWY. 67
KIEL, WISCONSIN 53042-1600 Fax: 920-894-7029
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A Few Words About Safety
Safety Information
Read and understand the entire manual before
operating or maintaining Stoelting equipment.
This Owner's 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.
T o highlight specific safety information, the following
safety definitions are provided to assist the reader .
The purpose of safety symbols is to attract your
attention 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 .
Safety Alert Symbol:
This symbol Indicates danger, warning or caution.
Attention is required in order to avoid serious personal
injury . The message that follows the symbol cont ains
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.
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” indicates a potentially
hazardous situation, which, if not avoided, may result
in minor or moderate 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 equipment/
property damage.
NOTICE
The signal word “NOTICE” indicates information or
procedures that relate directly or indirectly to the
safety or personnel or equipment/property.
Page 5
TABLE OF CONTENTS
SECTION 1 — INTRODUCTION ............................................................................................................................ 1
1.1 Description ..................................................................................................................................................... 1
1.2 Specifications ................................................................................................................................................. 1
SECTION 2 — INST ALLATION 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 — OPERA TION INSTRUCTIONS ....................................................................................................... 7
3.1 Safety Precautions ......................................................................................................................................... 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 Cleaning Mix Lines ....................................................................................................................................... 10
SECTION 4 — MAINTENANCE INSTRUCTIONS ............................................................................................... 11
4.1 Overrun Adjustment .......................................................................................................................................11
4.2 Preventative Maintenance ..............................................................................................................................11
SECTION 5 — TROUBLESHOOTING ................................................................................................................ 13
SECTION 6 — REPLACEMENT P ARTS INFORMATION .................................................................................... 15
6.1 How to Order Replacement Parts................................................................................................................. 15
6.2 Parts List and Reference Drawings ............................................................................................................. 15
WARRANTY........................................................................................................................................................... 23
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LIST OF ILLUSTRATIONS
Figure Description Page
1 U3-02A 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 3-way Tee Connection ............................................................................................. 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
Exploded Parts Illustrations..................................................................................... 17-21
Wiring Diagram........................................................................................................ 22
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SECTION 1
INTRODUCTION
1.1 DESCRIPTION
The Model U3-02A Remote Mix Pump is specially designed for use with Stoelting remote pressurized freezers.
Used with large capacity mix containers located in your
bulk storage cooler, the U3-02A Pump keeps mix handling
to a minimum.
Stoelting’s Model U3-02A Remote Mix Pump performs
three important functions with precision and reliability.
First, it transfers a continuous supply of mix from your
remote storage container to the freezing cylinder of your
freezer, quickly and conveniently. Second, the U3-02A
Pump precisely injects a preset amount of air into the mix,
maintaining overrun to assure maximum profitability. Third,
it pressurizes the freezing cylinder, forcing frozen product
through the spigot at the rapid dispense rates needed by
high volume locations.
1.2 SPECIFICATIONS
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
1 phase, 115 volts. Approximately 1.6 total running amps.
Cord and plug attached.
WARRANTY
One year parts.
UL, C-UL Approved, NSF Approved
Figure 1
U3-02A Pump
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SECTION 2
INSTALLATION INSTRUCTIONS
2.1 SHIPMENT AND TRANSIT
The mix pump has been completely assembled, operated
and inspected at the factory. Upon arrival at the final
destination, the mix pump must be checked for any
damage that may have occurred during transit.
The mix pump should arrive in satisfactory condition. THE
CARRIER IS RESPONSIBLE FOR ALL DAMAGE IN
TRANSIT, WHETHER VISIBLE OR CONCEALED. Do not
pay the freight bill until you have checked the equipment.
Have the carrier note any visible damage on the freight bill.
If concealed damage and/or shortage is found later, advise
the carrier inspector within 10 days and request inspection. The customer must place claim for damages and/or
shortages in shipment with the carrier. Stoelting, LLC
cannot make any claims against the carrier.
2.2 NATIONAL SANITATION FOUNDATION
COMPLIANCE REQUIREMENTS
In order to comply with "NSF International" (NSF) code
#6:
A. This unit (remote pump) must be installed with a
“NSF” listed refrigerated mix transfer line. The mix
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
must be maintained below 41°F (5°C.)
2.3 INSTALLATION
A. Follow the steps below to install the mix pump in an
upright position on the wall using optional pump
mounting kit. Allow clearance for a mix container
under pump. See Figure 2.
1.Mount by locating four (4) hole centers on cooler
wall using mounting bracket as template.
WARNING
Risk of Personal Injury/property Damage
V erify electrical and refrigeration line location inside
and behind the cooler's walls defore drilling.
2.Drill four (4) 1/2 inch diameter holes into cooler
wall 3/4 inch deep. See Figure 3.
3.Insert well-nut to flange and apply silicone sealant
around outside diameter of flange 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 (small parts bag) onto all
three pump mounting studs located under the
pump until bottomed.
COOLER WALL
10 FT. LIFT
MAXIMUM
PUMP
CHECK
VALVE
MIX
CONTAINER
7.Mount pump to bracket with wing nuts. Pump will
be held above the bracket by the standoffs.
REFRIGERATION
UNIT FOR MIX LINE
20 FT. MAXIMUM
Figure 2
Mix Transfer Line
3
FREEZER
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B. Mix Pump Hose Installation.
Follow the steps below to install the mix pump hose.
1. Turn pump on.
2. Feed one end of mix pump hose into the entering or
pick-up hose side (left) of black cover.
3. Gently push the hose into the black cover until it begins
to feed. See Figure A.
Figure B
7. Turn pump on.
Figure A
4. Allow the hose to feed itself thru the pump until 6"
remains on the entering side.
5. Turn pump off.
6. Connect mix pump hose to pickup hose adapter using
small hose clamp. See Figure B.
CAUTION
8. Gently pull on the discharge hose to help remaining 6"
of mix pump hose to feed thru pump until hose adapter
prevents further feeding.
9. Turn pump off. See Figure C.
Risk of Product Damage
Avoid twisting mix pump hose while feeding into cover.
Twisting the hose may cause the hose to rupture.
Figure C
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OPTIONAL
MOUNTING
KIT
C.Connect 1/2 inch (1.27 cm) I.D. plastic food grade tubing to
the mix check valve and then to the mix container. Observe
check valve flow arrow. Secure with hose clamps .
D.Connect 1/2 inch (1.27 cm) ID plastic food grade
tubing between the large port of air/mix tee and
refrigerated mix transfer line. Secure with large hose
clamp or equivalent.
CAUTION
Risk of Product Damage
Air/mix Tee must remain below the black Cover/clamp.
If the Tee is above the pump, mix will drain to the air
compressor resulting in pump damage.
Figure 3
Mix Pump Installation
10. Connect free end of mix pump hose to 3-way Tee
as shown in Figure D. When all connections are
complete the 3-way Tee must be lower than the
black pump housing.
3-WAY
TEE CONNECTION
Figure D
E. Plug mix pump into a 115 volt grounded receptacle.
WARNING
Hazardous Voltage
Remote mix pump must be plugged into a propely
grounded electrical receptacle. Do not alter the plug or
add a ground adapter plug. . Altering the plug to fit into
an outlet of different configuration may cause fire, risk
of electrical shock, product damage and will void the
warranty.
2.4 MIX PUMP CHECK OUT
Before using, the U3-02A Mix Pump should be thoroughly
cleaned. This is necessary to remove any foreign
materials that may be present.
A. The overrun adjustment is preset at the 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
bleed valve. Place mix pump switch in the ON
position and allow the system pressure to build up
and pump to shut OFF automatically . Leave the pump
on for ten minutes.
During this time, do not open spigot or freezer air
bleed valve. 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.
Locate leak by applying a liquid detergent or bubble
solution with a small brush to all tubing connections
and O-ring seals. Correct as required.
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SECTION 3
OPERATION INSTRUCTIONS
3.1 SAFETY PRECAUTIONS
Do not attempt to operate the U3-02A pump until the safety
precautions and operating instructions in the manual are
read completely and thoroughly understood.
Take notice of all warning labels on the U3-02A pump. The
labels have been put there to help in maintaining a safe
working environment. The labels are designed to withstand washing and cleaning. All labels must remain
legible for the life of the mix pump. Warning labels should
be checked periodically to be sure they have not been
removed, painted over, rubbed off, and can be recognized as warning labels.
If replacement labels are needed, indicate the part number, type of label, location of label, and quantity required.
Mail your name and address to:
STOELTING, LLC
ATTENTION: Customer Service
502 Hwy 67
Kiel, Wisconsin 53042
Labels will be furnished and mailed at no charge.
3.2 PUMP MOTOR SWITCH
The PUMP MOTOR switch (Fig. 4) is located on the mix
pump assembly. When the pump motor switch is placed
in the ON position, the mix pump motor will be actuated
to pump mix into the freezer cylinder. When the set
pressure is reached, the mix pump will shut off automatically. When the pump motor switch is placed in the OFF
position, the mix pump will be inoperative.
NOTE
The mix pump motor is equipped with an internal
overload that will “trip”, disabling the pump when the
motor is overloaded. Consult the trouble shooting
section for corrective information.The internal overload will automatically reset after cooling. If the condition continues, contact a qualified service person.
SAFE OPERATION IS NO ACCIDENT; Observe these
rules:
A. Know the U3-02A pump - read and understand the
Owner’s Manual.
B. Wear proper clothing - avoid loose fitting garments,
and remove watches, rings or jewelry which could
cause a serious accident.
C.Maintain a clean work area - avoid tripping or
slipping 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. Do not attempt to repair or perform maintenance on
the mix pump until the main electrical power has
been disconnected.
G.Do not operate the mix pump if unusual or
excessive noise or vibration occurs.
Figure 4
Pump Motor Switch
3.3 OPERATION OF U3 MIX PUMP
This section describes the operation of the U3 mix pump.
CAUTION
Risk of Product Damage
Mix pump hose must be repositioned every 1 -2
weeks. Failure to comply will result in reduced mix
pump liquid capacity , dispense stoppage, popping,
and possible mix pump hose leakage. Hose leakage may damage the pump roller assembly and void
the factory warranty .
A. Refer to freezer owners manual for the operation of
the freezer.
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 side of the hose and transferred thru the
discharge side to the freezer (Fig. 5).
C.Air Operation: The air compressor operates concur-
rently with the peristaltic mix pump. Air enters thru
an intake check valve on the piston downstroke. The
air is discharged thru an output check valve, and
second check valve on the piston upstroke. The air
and mix join at the tee and then travel to the freezer.
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ROLLER
MIX PILLOW
COVER/CLAMP
Mix Pump Operation
D.Overpressure Relief: Excess pressure is relieved
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.
3.4 CLEANING
The mix pump must be cleaned when changing mix or
whenever the freezer is shut off for an extended
period, such as overnight or on nonbusiness days. For
sanitary reasons, mix must not be allowed to remain in
the freezer lines or mix pump when the freezer is not
in operation.
NOTE
To clean the freezer, refer to the freezer owner’s
manual for complete cleaning procedures.
INLET SIDE
Figure 5
3-WAY TEE
3.5 DISASSEMBLY AND INSPECTION OF
REMOVABLE PARTS
Inspection of removable parts should be made whenever
maintenance is performed or pump requires disassembly.
WARNING
Hazardous Moving Parts
Revolving pump head can grab, mangle, and cause
serious crushing injury . The Power switch must be
placed in the OFF position for cleaning and power
must be disconnected when disassembling or
servicing.
1. Place the CLEAN-OFF-ON switch in the clean
position and agitate 5-10 minutes 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 120ºF detergent solution
water thru freezer. The use of sof t water is recommended, along with dishwashing detergents such as
“Joy,” “Dawn,” or equivalent.
5. Place mix pump switch in OFF position. Open spigot
to relieve remaining pressure.
6. Place the CLEAN-OFF-ON switch in the OFF posi-
tion.
Figure 6
Removing Parts
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CAUTION
System Under Pressure
Never disconnect hoses from freezer or pump without
first opening spigot to relieve pressure.
To sanitize, refer to local sanitary regulations for applicable
codes and recommended disinfecting products and procedures. The frequency of cleaning must comply with local
health regulations. Use a solution containing 100 PPM of
free available chlorine. Use “Stera-Sheen Green Label
Sanitizer and Cleaner," or others in accordance with
Health Inspection Requirements.
NOTE
If the mix lines or air line is difficult to remove, soften
with a rag soaked in hot water. Hose connections
may be sprayed with Haynes Sanitary Lubricant for
ease of removal. Do not loosen or remove the mix
pump cover wingnuts. Maintain the mix pump hose
in its operational condition.
1. Loosen clamp and remove air hose from pump
compressor.
2. Loosen clamp and disconnect mix pump hose.
Remove the pickup hose, mix check valve and pickup
hose adapter (and bag adapter if applicable) as an
assembly from mix container.
3. Completely disassemble both hose assemblies and
check valve. Place hoses, tee, check valve assembly , and pickup hose adapter in mild detergent water
and wash thoroughly . Use soft bristle brushes to
clean inside of fittings. Rinse all parts in clean 120ºF
water.
4. Carefully inspect each part for wear or damage.
Replace worn or damaged parts.
NOTE
Stoelting, LLC has found that STERA-SHEEN
GREEN LABEL SANITIZER AND CLEANER does
an effective job of properly sanitizing and cleaning a
pump and soft serve freezer. W e therefore include
a sample with each new freezer. For further information read the directions on the packet. Other
products may be as effective.
CAUTION
Risk of Product Damage
Avoid prolonged contact of sanitizer with freezer. Prolonged contact may cause corrosion of stainless steel
parts and void factory warranty.
In general, sanitizing may be conducted as follows:
1. Prepare two gallons (7.5 liters) of sanitizing solution
following manufacturer’s instruction, and place pump
suction (inlet) line into solution.
2. Place mix pump switch in ON position.
5. Prepare two gallons (7.5 liters) of sanitizing solution
using a USDA certified grade sanitizing solution.
Sanitize all removed parts, then air dry .
6. Check Hose Service Record decal to determine if
hose
reposition or replacement is required at this time
(Sec. 4.2).
7. Reassemble both hose assemblies per the diagram
(Fig.6). Reconnect assemblies to the pump and
discharge hose per the diagram, using the clamps.
CAUTION
Risk of Product Damage
Do not use excessive force when assembling parts.
Parts fit together easily when properly installed.
3.6 SANITIZING AND STARTUP
For sanitizing to be effective, it must be performed after the
mix pump and freezer parts have been cleaned, and just
prior to filling the freezer with mix. Sanitizing the night
before is not effective.
3. Check for leaks when freezer barrel is first pressurized with sanitizing solution.
4. Place freezer CLEAN-OFF-ON switch in CLEAN
mode (no refrigeration).
5. After five minutes in CLEAN mode, open spigot and
pump the remaining sanitizing solution thru the
freezer, close spigot and switch the freezer and
pump to OFF.
6. Place pickup tube into mix bag or container of mix
and start the pump.
7. Open spigot, allowing incoming mix to push remaining sanitizer out of hoses and freezing cylinder.
Close spigot as soon as pure mix begins to come
out (after about one pint).
8. Push in the air bleed valve located on the front door
(Challenger Series) and allow the mix to come within
1/2" of the air bleed valve, then close the valve.
9. Place freezer in the on or freezing position.
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3.7 CLEANING MIX LINES
The mix lines must be cleaned and sanitized whenever
changing mix or whenever the freezer is off for an extended
period of time - such as overnight, or nonbusiness days.
The mix lines are sufficiently cleaned and sanitized when
cleaning and sanitizing the pump and freezer as an
assembly.
Once every 2 weeks, if required, perform the following
steps:
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
well for this purpose.
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SECTION 4
MAINTENANCE INSTRUCTIONS
4.1 OVERRUN ADJUSTMENT
The product when served is a combination of air and mix.
Overrun is a measure of the amount of air blended into the
mix.
Overrun 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 with air
added weighs 12 ounces, the over-run is said to be 50
percent (18 oz. - 12 oz. = 6 oz., (6 /12) x 100 = 50%.
The overrun can be checked by placing a one pint container
on an ice cream scale and zeroing out the scale. 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.
The mix pump has been preset at the factory to produce
a product with approximately 40% overrun. Because of
differences in mix formulation, temperatures and barometric pressure, this figure may vary. It will be necessary
for approximately 2 gallons of mix to be pumped thru the
freezer before changes in the product are noticeable due
to adjustments in overrun.
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. Conversely, 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
unplug the mix pump from its grounded 115V
receptacle.
B. Remove the 2 electrical box cover screws and
remove the electrical box cover.
OVERRUN
ADJUSTMENT
Figure 7
Overrun Adjustment
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 1 15V
receptacle and turn the mix pump power switch to
the ON position.
4.2 PREVENTATIVE MAINTENANCE
To assure trouble free operation and consistent overrun
when using the U3 mix pump, we must follow mix hose
repositioning and replacement procedures. The following is the preventative maintenance schedule:
A. MIX PUMP HOSE REPOSITION (every one or two
weeks.)
NOTE
Mix pump hose must be repositioned every 1 - 2
weeks. Failure to comply will result in reduced mix
pump liquid capacity , dispense stoppage, popping,
and possible mix pump hose leakage.
C.
On air compressor side of pump, locate the long/
slender piston rocking arm. The rocking arm downward 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 overrun setting is indicated by a pointed pin.
E. T o adjust overrun, loosen the allenhead screw
(located within the center of the adjustment knob)
with the 5/32" allen wrench provided. Rotate the
adjustment knob counterclockwise to a higher
number for higher overrun, or clockwise to a lower
number for lower overrun. Each number multiplied
by 10 represents the overrun percentage (ie: #4 =
40% overrun).
1. Run cleaning solution through pump.
2. Turn pump off and if connected to freezer, relieve
any pressure by 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
reversed fed through the pump, 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
Figure 8.
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R
p
Pressures for Stoelting Freezers: Cut-out 24# ±3 PSIG
6. Reconnect mix pump hose to adapter.
For Duke Freezers: Cut-out 30# ±3 PSIG
CUT LINE
MEASUREMENT
(APPROX. 7 1/2")
PICK UP
SIDE
Figure 8. Reposition Mix Pump Hose
3. Disconnect mix pump hose at each end.
COVER/CLAMP
MIX PILLOW
ROLLER
DISCHARGE SIDE
19
20
3-WAY TEE
7. Turn pump on.
8. Gently pull on the discharge hose to help remaining
6" of mix pump hose to feed thru pump until hose
4. Grasp the discharge hose end with one hand and turn
the pump on. Pull down on the hose until all of the
remaining hose is removed from the pump.
adapter prevents further feeding.
9. Turn pump OFF and pump will be ready for normal
operation.
NOTE
Each hose is long enough for 3 repositions be-
5. Turn pump roller assembly so bottom roller is at 6:00.
Roller
oller
Roller at 6:00 Orientation
Cover/Clam
Cover/Clamp
fore replacement is required. Record each event
on Hose Service Record decal.
Inlet
Side
Discharge
Discharge
Side
Inlet
B. MIX PUMP HOSE REPLACEMENT
NOTE
Mix pump hose must be replaced when tubing
cannot be further repositioned (every four to eight
weeks). Failure to comply will result in hose failure and possible pump damage.
1. Run cleaning solution through pump.
2. Turn pump off and if connected to freezer relieve
6. Use a brush that fits in the opening and brush up and
down, first with detergent water and then clear water.
Figure 9. Pump Roller Assembly
any pressure by opening the spigot.
7. Connect mix pump hose to pick-up hose adapter,
W ARNING
using small clamp.
8. Insert free end of hose into the pick-up (suction side)
Hazardous Moving Parts
Revolving pump head can grab, mangle, and cause
serious crushing injury . The Power switch must be
placed in the OFF position for cleaning and power
must be disconnected when disassembling or
servicing.
CAUTION
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
pump hose feed thru pump until hose adapter prevents
further feeding, then turn pump off.
NOTE
Remove cover clamp from pump on a monthly basis
System Under Pressure
Never disconnect hoses from freezer or pump without first opening spigot to relieve pressure.
to clean and check for wear. (Cover clamp & roller
bearings) Clean parts with soap and water and reassemble.
9. Reconnect mix pump hose to Tee using small clamp.
Pump is now ready to sanitize.
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SECTION 5
TROUBLESHOOTING
1. P UMP MO T O R DO ES NOT RUN
Power to pump is off. Supply power to pump.
Low voltage. Check fo r low voltage.
Mix pump hose jammed inside black cover/clamp. Disconnect pump from power source. Remove four
cov er/ cla mp thumb screw s . S e parate cover /clamp halv e s
and remove outer half. Remove jammed hose. Re-install
cover/clamp and tighten four thumb screws s ecurely.
Allow motor thermal overload to reset. See Sec. 4.2 for
hose replac ement. Do not use jammed portion of hose.
Pump motor overloaded. Allow internal thermal ove rl oad to reset; determine
overload cause and repair.
Pressure switch on pump is defective. Check mechanical operation and continuity of pressure
switch.
Defect ive moto r/capacitor Check motor amperage draw and/ o r capac i t or. Replace
motor or capacitor.
Defectiv e 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: IMMEDIATELY AFTER A "BAG CHANGE" THE PUMP MAY BE UNABLE TO RE-ESTABLISH IT'S
PRIME WITH THE SYSTEM AT OPERATING PRESSURE. IN THIS CASE, TURN THE PUMP OFF. DRAW 2-3
PINTS TO REDUCE SYSTE M PRESSURE TO ZERO. TURN PUMP ON. PURGE REMAINING AIR IN MI X BAG
AND PICK-UP HOSE.
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 mix supply.
MI x pump hose kinked inside black cover/clamp. Follow mix pump hose jammed repair. (S ee #1 abo ve.)
Hoses assembled incorrectly. Refer to diagram for correct hos e connections.
Mix pump hose service life is exceeded. Reposition/replace mix pump hose. See Sec. 4.2.
Mix pump hose not connected to freezer. Connect mix pump hose to freezer.
Ice crys tal s in m ix.
Mix bag drawn against adapter.
Foreign objects in mix.
Check valve is backw a r ds.
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
Mix pump hose service life is exceeded. Reposition/replace mix pump hose.
Out of mix. Repl enish mix supply.
Overrun setting too high.
Pick-up leg of mix pump hose i s collaps ing.
NOTE: AL SO SEE "2 " ABOVE.
Completely thaw mix prior to use.
Assure bag is clear of pick-up tube.
Clear blockage. Use fresh mix.
Observe flow arrow for proper orientation.
Decreas e overrun set t i n g.
See Section 4.2.
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SECTION 6
REPLACEMENT PARTS INFORMATION
6.1 HOW TO ORDER REPLACEMENT P ARTS
To assure the receipt of the proper replacement parts,
supply your dealer, distributor or the company with the
following information:
A. Model number of equipment.
B. Serial number of Model. (Stamped on nameplate).
C.Part number , part name, and quantity needed. Many
part names and numbers are listed in this manual.
NOTE
Minimum Billing is $50.00 Net.
6.2 PARTS LIST AND REFERENCE DRAWINGS
The following lists and drawings will aid the user when
ordering parts or servicing the mix pump.
Figure 10
Pump and Decal Assembly
15
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16
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OPTIONAL MOUNTING KIT
SEE SERVICE REFERENCE, PAGE 19
17
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1819202122
Page 25
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WARRANTY
MIX TRANSFER PUMPS / COCKTAIL / SLUSH
1. Scope:
Stoelting LLC warrants to the first user (the “Buyer”) that the evaporator assembly and compressor (if
applicable) of Stoelting mix transfer pump, cocktail and slush equipment will be free from defects in materials and workmanship under normal use and proper maintenance appearing within five (5) years (two (2)
years for “Mirage” equipment), and that all other components of such equipment manufactured by Stoelting
will be free from defects in material and workmanship under normal use and proper maintenance appearing
within twelve (12) months after the date that such equipment is originally installed.
2. Disclaimer of Other Warranties:
THIS WARRANTY IS EXCLUSIVE; AND ST OEL TING HEREBY DISCLAIMS ANY IMPLIED
WARRANTY OF MERCHANT ABILITY OR FITNESS FOR PARTICULAR PURPOSE.
3. Remedies:
Stoelting’s sole obligations, and Buyer’s sole remedies, for any breach of this warranty shall be the repair or
(at Stoelting’s option) replacement of the affected component at Stoelting’s plant in Kiel, Wisconsin, or
(again, at Stoelting’s option) refund of the purchase price of the affected equipment, and, during the first
ninety (90) days of the warranty period, deinstallation/reinstallation of the affected component from/into the
equipment. Those obligations/remedies are subject to the conditions that Buyer (a) signs and returns to
Stoelting, upon installation, the Warranty Registration Card for the affected equipment, (b) gives Stoelting
prompt written notice of any claimed breach of warranty within the applicable warranty period, and (c)
delivers the affected equipment to Stoelting or its designated service location, in its original packaging/
crating, also within that period. Buyer shall bear the cost and risk of shipping to and from Stoelting’s plant
or designated service location.
4. Extensions:
The warranty period for deinstallation/reinstallation of the affected component from/into the equipment is
extended to twelve (12) months on the following models: SO218, SO318, SO328. The warranty period for
the drive motor to be free of defects in materials and workmanship extended to five (5) years on the following
models: SO218, SO318, SO328.
5. Exclusions and Limitations:
This warranty does not extend to parts, sometimes called “wear parts”, which are generally expected to
deteriorate and to require replacement as equipment is used, including as examples but not intended to be
limited to o-rings, hoses, seals and drive belts. All such parts are sold
AS IS.
Further, Stoelting shall not be responsible to provide any remedy under this warranty with respect to any
component that fails by reason of negligence, abnormal use, misuse or abuse, use with parts or equipment
not manufactured or supplied by Stoelting, or damage in transit.
THE REMEDIES SET FORTH IN THIS WARRANTY SHALL BE THE SOLE LIABILITY
STOEL TING AND THE EXCLUSIVE REMEDY OF BUYER WITH RESPECT TO EQUIPMENT
SUPPLIED BY STOEL TING; AND IN NO EVENT SHALL ST OELTING BE LIABLE FOR ANY
INCIDENTAL OR CONSEQUENTIAL DAMAGES, WHETHER FOR BREACH OF W ARRANTY
OR OTHER CONTRACT BREACH, NEGLIGENCE OR OTHER TORT, OR ON ANY STRICT
LIABILITY THEORY.
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