Sealer Sales SS-2028MK User Manual

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SS-2028MK Sealer Service Manual

IMPORTANT - PLEASE READ THIS CAREFULLY

The development of a good safety program, that is rigidly
enforced, is absolutely imperative when involved in the operation of
industrial equipment. Our machinery is well designed and includes
extremely important safety features. The part you the user play
through proper installation and maintenance procedures is of far
greater significance than our designs. Only properly trained
individuals following rigidly enforced safety rules, as recommended
by A.N.S.I. and O.S.H.A., should be allowed to operate these
machines.

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SS-2028MK Sealer Service Manual

TABLE OF CONTENTS

___________________________________________________________

Preface

Unpacking 5-8
Warranty Notice 9
Warranty 10-11
Warranty Exceptions 12
Warnings 13-15

Sealer Section

Description and Specifications 16
Installation and Basic Set-Up 17-23
Film Threading Diagram 24
Sequence of Operation 25-27
Compensator Adjustment 28-29
Troubleshooting 30-46

No Heat to Band Ribbon 30-35
Unbalanced Heat from Band Ribbon 36
Weak Seals/Poor Film Cut Off 37-38
Conveyor Will Not Run 39-41
Magnet Won’t Hold Down 42-44
Excessive Film Drag 45
Excessive Film Winding 46

Maintenance 47-72

Micro Knife Compensator Adjustment 47-49
Micro Knife Replacement 50-55
Tape Replacement 56
Sealing Pad Replacement 57
Seal Pad Pressure Adjustment 58
Adjust Height of Seal Bar 59
Pulse Switch Adjustment 60
Adjust Magnet Seal Pressure 61
Conveyor Motor Replacement 62-63
Replacing Seal Bars 64-67
Installation of Transite Channels 68-69
Installing Compensator 70-72

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SS-2028MK Sealer Service Manual

Electrical Schematic 73
Electrical Panel Diagram 74
Parts Nomenclature 75
Replacement Parts List 76-79
Spare Parts List 80

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SS-2028MK Sealer Service Manual

UNPACKING

THOROUEXCELY INSPECT EQUIPMENT UPON ARRIVAL.

If goods are received short or in a damaged condition, it

is important that you notify the carrier’s driver before he leaves
your company and insist on a notation of the loss or damage

across the face of the freight bill. Unless this is done, no claim can
be enforced against the transportation company.

If concealed loss or damage is discovered, notify
the carrier at once and insist on an inspection. This is
absolutely necessary! A concealed damage report must be
made no later than ten (5) days from the date the shipment
was delivered. Unless you do this, the carrier will not
consider any claim for loss or damage. The carrier’s agent will

then make an inspection and grant a concealed damage notation. If
you give the transportation company a clear receipt for the goods
that have been damaged or lost in transit, you do so at your own risk
and expense.

All claims must be filed within 5 days of delivery date or
carrier will not accept them.

is willing to assist in every possible manner to
collect claims for loss or damage; however, this does not hold
responsible for collection on claims or replacement of material.

UNPACKING

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SS-2028MK Sealer Service Manual

Your new L-Bar Sealer comes bolted to a pallet and

has a tri-walled corrugated box strapped to the pallet to protect it.

1. If your machine does not arrive in this condition, write on

shipping paperwork that outside of box is damaged.
Concealed damage may have occurred.

2. Remove stretch film and Poly Bag covering machine.

UNPACKING

SS-2028MK Sealer Service Manual

Page 7

3. Remove film rack from under L-Bar Sealer.

4. Check film rack. You should have

(a) (1) Film Rack with Dual Pin Perf. Hole Punch
(b) (4) mounting bolts
(c) (1) adjustable knob
(d) (2) film roll guides

UNPACKING

SS-2028MK Sealer Service Manual

5. Mount film rack roll guides as shown.

Page 8

6. Remove bolts holding L-Bar Sealer to pallet using 13-mm

wrench.

7. Place forks of forklift under center of lower support bar of L-

Bar Sealer frame and lift off pallet.

8. Place in desired location and use locking casters to set in

place.

UNPACKING

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SS-2028MK Sealer Service Manual

IMPORTANT WARRANTY NOTICES

OPERATING AND MAINTENANCE MANUAL

The operating and maintenance manual has been
carefully prepared to provide the user with all the information needed
to properly install, operate, and maintain your equipment.

Please read this manual carefully and refer to it
for information on the care and use of your equipment. It
is recommended that additional copies be ordered for use by
production, maintenance, and supervisory personnel. Although
the design of this equipment incorporates safeguards to protect
personnel, care should be used in operating, adjusting, and
servicing.

Attention is directed to the warranty that accompanies all
your equipment. The terms and conditions of this warranty apply
only to unmodified units. Any unauthorized modifications to
the equipment automatically voids this warranty.

WARRANTY

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SS-2028MK Sealer Service Manual

WARRANTY

Sealer Sales, Inc. warrants each new product
manufactured to be free from defects in material and
workmanship for a period of (1) year from date of shipment by .

This warranty is not transferable with any subsequent resale.

Defective parts under warranty must be returned to Sealer
freight prepaid. Sealer Sales’s sole obligation and purchaser’s
sole remedy in the event of a warranty dispute shall be, at
Sealer Sales’s option, to repair or replace the part in question.
Labor incurred in removing or installing the defective part is
not covered by this warranty. Prior to returning any parts for
any reason, contact
Sales for a Return Authorization Number. This number must
accompany all returns.

This warranty shall not apply if equipment has been tampered
with, misused, improperly installed, altered, or has received damage
due to abuse, carelessness, accident or failure to follow
recommended regular maintenance procedures or has been serviced
by someone other than a duly authorized factory
representative without the express written consent of Sealer, Inc.

This warranty is in lieu of all other warranties, expressed or
implied, including but not limited to warranties of merchantability and
fitness for a particular purpose, non-infringement or any other
matter.

WARRANTY

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SS-2028MK Sealer Service Manual

Sealer Sales shall have no liability to any person for direct,
indirect, incidental or consequential damages or delay resulting
from any defect negligence, or tort and customer hereby waives for
itself any and all claims for punitive damages and all claims of
negligence of strict liability or both. In no event shall our liability
exceed the purchase price of the product that was actually paid.

Sealer Sales reserves the right to make changes,
additions, or improvements to our products with no obligation
to make such changes in any previously shipped product covered by
this warranty.

Sealer Sales shall not be held liable for any damages
arising out of nor in connection with the operation of the
equipment should customer or its agent fail to maintain
equipment in safe operating condition. This warranty shall become
unenforceable if and to the extent the customer or its agents
remove, disconnect, or otherwise render useless any safety device
and or parts designed or affixed by us or fails to maintain and
service equipment in a manner as advised.

Sealer Sales provides a one-year warranty on
parts, excluding shipping or freight costs for
replacement parts. All warranty parts are shipped
F.O.B. Ontario, California. Service Labor to install part is
not covered under warranty!

WARRANTY

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SS-2028MK Sealer Service Manual

WARRANTY EXCEPTIONS

The following parts are an exception to the
general warranty list on page 10. Each part listed below shall carry a
30-day warranty unless designated otherwise.

SS-2028MK Sealer Parts

1. Conveyor Belt

2. Fuses

The following sealer parts are considered to be consumable and

not under warranty:

1. Silicone Sponge

2. PTFE Tapes

3. Nylon Sleeves

WARRANTY EXCEPTIONS

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SS-2028MK Sealer Service Manual

WARNINGS

Every effort has been taken to ensure your safety while
operating this machine; however, there still remain certain risks. Do
not allow this machine to be operated before informing all personnel
of the following warnings.

WARNING........

Do not tamper with the electrical wiring. Only use a
licensed electrician for maintenance. Always disconnect the electrical
power before attempting any maintenance to all electrical and/or
moving parts.

WARNING........

In order to prevent injury to personnel and/or machinery
DO NOT INCREASE SETTINGS OR RATINGS ON EITHER ELECTRICAL
OR MECHANICAL OVERLOAD SAFETY DEVICES.

WARNING........

KEEP HANDS AWAY FROM MOVING CONVEYORS AND
ASSEMBLIES. Conveyor belts that have become worn or frayed are
capable of being hazardous. They should be replaced promptly.

WARNING........

NEVER OPERATE THIS OR ANY MOVING EQUIPMENT
WITHOUT ALL COVERS AND GUARDS IN PLACE. The internal
mechanism of most packaging machinery contains numerous shear,
pinch, and inrunning nip points, many of which are capable of
causing severe injury and/or permanent disfigurement.

WARNINGS

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SS-2028MK Sealer Service Manual

WARNING........

To minimize the potential for personnel injury, always be
sure that machine operators and others working on the machinery
are properly trained in the correct usage of the equipment and
properly instructed regarding the safety procedures for operation.

WARNING........

Heat sealing arms and sealing jaws on packaging
machinery can become very warm after a period of use. KEEP
HANDS AWAY WHILE IN OPERATION AND USE CAUTION IF THE
MACHINE HAS BEEN RUNNING RECENTLY.

WARNING........

ANY MODIFICATIONS TO EITHER THE ELECTRICAL
CIRCUITRY OR THE MECHANICAL ASSEMBLIES OF THE MACHINERY
WILL VOID ANY WARRANTIES ASSOCIATED WITH THIS
EQUIPMENT. Such modifications may introduce hazards that
would not otherwise be associated with this machinery. Sealer will
not be responsible for any consequences resulting from such
unauthorized modifications.

WARNING........

The use of certain types of plastic films in sealing and/or
shrinking equipment may result in the release of HAZARDOUS FUMES
due to the degradation of the film at high temperatures. Before
using any plastic film in this equipment, the manufacturer or supplier
of the film should be contacted for specific information concerning
the potential release of hazardous fumes. ADEQUATE VENTILATION
MUST BE PROVIDED AT ALL TIMES.

WARNINGS

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SS-2028MK Sealer Service Manual

WARNING........

It is important that the machine operator turn off the
Main Power Switch when he/she has finished operating the unit.

WARNINGS

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SS-2028MK Sealer Service Manual

DESCRIPTION AND SPECIFICATIONS OF

MODEL SS-2028MK SEALER

DESCRIPTION

The purpose of a SS-2028MK Sealer is for medium to
high volume packaging requiring excellent seals and minimal
maintenance. It features “micro knife technology” for sealing of
films. This model incorporates an electromagnetic hold-down
system, allowing the operator to load another package while the
preceding package is being sealed. This system provides
consistent seals. In addition, a package take-away conveyor
increases production speed by automatically discharging product
into the tunnel.

SPECIFICATIONS

Model:
Seal Area:

Machine Size:

Volts:
Amperage:
Weight:

SS-2028MK

Width: 20”
Length:
28” Length:
83” Width:
32” Height:
43” 220

20
500 lbs.

DESCRIPTION AND SPECIFICATIONS

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SS-2028MK Sealer Service Manual

INSTALLATION AND BASIC SET-UP

IMPORTANT

Read this manual carefully, and make it available to
everyone connected with the supervision, maintenance, or production
of this machine. Additional copies are available at your request.
(Contact your distributor for this information.) Be very careful when
operating, adjusting, or servicing this equipment. If in doubt, stop
and obtain qualified help before proceeding.

INSTALLATION OF SS-2028MK SEALER

Place the L-Bar Sealer in the desired location with
the required electrical power source available. (See

power requirements.) Make certain that proper electrical wiring is
provided to guard against low voltage. If the voltage is too
low, the equipment will not function properly.

Finding the proper location is a most important function
of the initial set-up. One must take several factors into
consideration:

1. Adequate power source.

2. Relationship to source of product.

3. Relationship to L-Bar Sealer.

4. Relationship to any conveyors necessary to remove

finished product.

5. Convenience of operator.

An electrician should install a plug on the end of the main
power cord. If there is any doubt, get qualified assistance to do the
initial installation. Do not take any chances!

INSTALLATION

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SS-2028MK Sealer Service Manual

Do not attempt to install, adjust, or operate this machine
without first reading the contents of this manual. Although the
design of the equipment incorporates safeguards to protect operating
and maintenance personnel, care should be used in operating,
adjusting, and servicing.

INSTALLING FILM RACK

IMPORTANT: Remove film rack from under sealer and

install at the end of the sealer on the right hand side with the four
bolts an center knob provided. Mounting holes are slotted for
adjustment, set film rack flush with backside of the machine frame.

INSTALLATION

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SS-2028MK Sealer Service Manual

MOUNTING FILM

Select the proper width of centerfold film for the item being
packaged, allowing for width and height of package. With the
package properly positioned within the film in the sealing area, allow
sufficient film to overlap the sealing bars so that a seal may readily
be made without any possibility of open areas due to insufficient film.

Place film roll on cradle mount film rack. The centerfold is to
be placed away from the operator, toward the rear of the machine.
Position film roll on rack and tighten film guide nuts to hold film roll
in position.

Thread film through the Pin Perforator. Note that the
perforator wheel turns freely and is not binding.

INSTALLATION

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SS-2028MK Sealer Service Manual

Once threaded, separate film top from bottom and insert
product tray between. Make sure that the centerfold of film is placed
at the rear of the product tray. This allows the operator to insert
product between the layers of film on the product tray and to
prepare to move product and film into the sealing area. When
threading film, make sure to pull more than sufficient film through
the rollers, across the product tray, and into the sealing area to
ensure sufficient film to begin operation.

Place product against rear of film separator tray. Then move
product into seal area. Be sure to leave the bag loose around the
product when making the seal. This helps eliminate the seals from
blowing out in the shrink tunnel. This completes threading and/or
mounting film.

INSTALLATION

SS-2028MK Sealer Service Manual

PIN PERFORATOR

Page 21

Located between the lower idler rollers, the pin perforator
creates holes for air escape as the operator pulls on the film. This
allows the air to escape as the package travels through the tunnel.

The pin perforator is adjustable and must be properly placed in
conjunction with the width of the desired package. The positioning
should always be re-evaluated when setting the machine for different
size product or different size film. Adjustments may be made with
the adjustment knob attached to the bottom of the film rack.

FILM BRAKE

INSTALLATION

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SS-2028MK Sealer Service Manual

The film brake is located on the operator side of the film cradle.
It serves to create tension on the dispensing film, in order to prevent
over-run and/or slack. From time to time, the operator should re­evaluate its setting to ensure proper tension.

PRODUCT TRAY

The product tray is an adjustable metal platform used to
separate film and to insert product between top and bottom layers of
film.

The tray is adjustable to achieve proper depth, equal to the
depth of the package, allowing product to be placed exactly in the
centerfold of the film each time. A locking wing screw allows you to
set tray position.

INSTALLATION

SS-2028MK Sealer Service Manual

LOCKING WING SCREW

Once the product is placed in the desired location, tighten the
wing screw under the loading tray to lock tray in position.

Page 23

Power Discharge Conveyor

Lower Power Discharge Conveyor using the crank wheel located
underneath the Power Discharge Conveyor. The Conveyor should be
set so the package height is centered to the seal pad. In essence, ½
of the package is above the seal pad and the other ½ of the package
is below the seal pad. This will place the seal in the center of your
package and help release any film tension that may occur.

INSTALLATION

Page 24

Film Roll

Pin Perf.

SS-2028MK Sealer Service Manual

FILM THREADING DIAGRAM

FILM THREADING DIAGRAM

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SS-2028MK Sealer Service Manual

SEQUENCE OF OPERATION

A. Product is placed on the film separator tray.

B. The product tray functions as a means to separate the film,

allowing placement of product between upper and lower

portions of the film.

C. Move product into seal head area by pushing the product to the

left.

D. As the seal head is lowered toward the bottom seal pad, the

cycle switch is activated which initiates the “micro knife”,

magnet time and conveyor time. The timers are located in the

front of the machine and can be adjusted from 0 to 6 seconds.

E. Take-away Conveyor Unit - Once the seal is completed, the seal

head automatically releases and the take-away conveyor begins

to run. It is adjustable from one (1) to six (6) seconds. The

timer is located on the front of the machine.

NOTE: If too much tension is on the film while the

bag is being made, the seals will, more than
likely, be weak or will “blow out” in the seal
area while passing through the shrink tunnel.
Make sure to relax the film tension prior to
sealing.

SEQUENCE OF OPERATION

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SS-2028MK Sealer Service Manual

SEQUENCE OF OPERATION

1. After setting the Band Ribbon compensator for the film type in

use (see page 28 for instructions), proceed as follows:

A. With film threaded, (see instructions for mounting film)

place right hand on package and slide product into the
upper left hand corner of the film (i.e. corner formed by
folded rear edge of film and previously sealed left edge of

film), pushing the package up against the ½” high

package stop at rear of product loading tray.

B. Place right hand under top sheet of film and on front

right corner of product. Place left hand on tail of both

SEQUENCE OF OPERATION

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SS-2028MK Sealer Service Manual

sheets of film. Now push the package with right hand
and pull the film with left hand moving package and film

into lower right corner of seal area. Allow from ½” to 1”

of extra film around package. This will allow some slack
film between the package and the sealing bars, reducing
film tension.

C. Press sealing handle down. IMMEDIATELY release

pressure. The sealing head will remain down for the
duration of the time set on the seal timer.

D. The operator may then load the next package onto the

product tray, thus speeding up the sealing operation.

SEQUENCE OF OPERATION

Page 30

Compensator

Screw

SS-2028MK Sealer Service Manual

COMPENSATOR ADJUSTMENT

Because of the importance of the adjustment of the Band
Ribbon compensator to the successful operation of the sealer, the
following explanation of its operation is given.

The front stainless steel compensator is used to adjust the
Band Ribbon temperature. As the seal head is lowered against the
bottom seal pad, a pulse switch is activated at the rear of the seal
bar supplying voltage to heat the Band Ribbon. As the Band Ribbon
heats up, the stainless steel compensator is spring-loaded and
expands as the Band Ribbon continues to heat. When the
compensator finally expands to the point that it touches the threaded
screw, the circuit is completed and the supply voltage is turned off.
The simple principle of this device is to compensate for the
residual heat that builds up in the Band Ribbon. As you operate the
L-Bar Sealer faster and faster, the actual amount of heat from the
Band Ribbon stays constant, reducing the amount of heat
transferred to the PTFE tape or seal sponge.

NOTE: The farther away you set the threaded compensator

screw from the compensator, the hotter the band ribbon will

become. A good starting point is to allow a gap of ¼”.

Thicker film such as 100GA Polyolefin might require a

slightly larger gap. You are now ready to run production on

your L-Bar Sealer.

TROUBLESHOOTING—NO HEAT TO BAND RIBBON

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SS-2028MK Sealer Service Manual

TROUBLESHOOTING

The following guidelines are provided to aid in determining the
source of any operation difficulties that may develop. In performing
the tests and checks which follow, carefully inspect for any loose
components, broken or loose wires, poor electrical connections, etc.,
while testing the various switches, controls, relays, transformers, etc.
For checking electrical problems, use a voltage meter.

Note: While troubleshooting use caution to avoid danger of

electrical shock. When power is not required for
checking for the presence or value of voltages used,
always have it disconnected.

DISCONNECT ALL POWER BEFORE MAKING ANY REPAIRS.

REFER TO ELECTRICAL BOARD LAYOUT AND ELECTRICAL

SCHEMATIC FOR LOCATION OF ELECTRICAL COMPONENTS

NO HEAT TO BAND RIBBON

1. Check that the sealer is plugged in and that power is present at

the socket. Make sure the power switch is in the ON position.

TROUBLESHOOTING—NO HEAT TO BAND RIBBON

SS-2028MK Sealer Service Manual

2. Make sure timer is not set on zero (0) on time dial.

Page 32

3. Check “micro knife” pulse switch adjustment.

(a) Make sure switch is being activated when the seal bar is

within ¼” of contact with seal pad.

(b) Press switch by hand. If no click is heard, replace switch.

TROUBLESHOOTING—NO HEAT TO BAND RIBBON

SS-2028MK Sealer Service Manual

F6 – 2 AMP

F5 – 3 AMP

F4 – 2 AMP

F3 – 15 AMP

F1 – L1 --20AMP

F2 – L2 -- 20 AMP

Page 33

4. Check all fuses.

TROUBLESHOOTING—NO HEAT TO BAND RIBBON

Page 34

GAP 1/8” to ¼ “

SS-2028MK Sealer Service Manual

5. Check “micro knife” compensator setting. You should always

have a gap of at least 1/8” to 1/4” between the compensator

and the adjustment screw. If the compensator screw is touching
the compensator the Band Ribbon will not heat up.

6. Check to see if CR1 contactor is pulled in at all times when Main

Switch is in the ON position.

TROUBLESHOOTING—NO HEAT TO BAND RIBBON

SS-2028MK Sealer Service Manual

Wire 10

Wire 8

Wire 7

Wire 9

7. Check for operation of contactor – CR2.

(a) Check for 220 power on wires 7 and 8. When CR2 is

pulled in, you should have 220 present on wires 9 and 10.

(b) Manually engage contactor and check for continuity on

each leg. If required, clean or replace contact points or
replace contactor.

Page 35

8. Check for voltage present at both primary and secondary of

transformer T2 as per values shown in the voltage specifications.

TROUBLESHOOTING—NO HEAT TO BAND RIBBON

Page 36

RL2

SS-2028MK Sealer Service Manual

9. Check for broken Band Ribbon inside or outside the corner block.

10. Check RL2 relay to make sure it is secure in the socket.

TROUBLESHOOTING—NO HEAT TO BAND RIBBON

SS-2028MK Sealer Service Manual

Check Wires 14 and 26

Check Wires 12 and 13

UNBALANCED HEAT FROM FRONT
AND SIDE MICRO KNIFE BAND RIBBON

Page 37

1. Make sure Band Ribbon is seated properly in channel and you

have PTFE insulator around Band Ribbon in corner block.

2. Check for poor connections to each end of front and side

compensator assemblies and corner block.

TROUBLESHOOTING—UNBALANCED HEAT FROM BAND RIBBON

SS-2028MK Sealer Service Manual

WEAK SEALS AND/OR POOR FILM CUT-OFF

Page 38

1. Improper setting of “micro knife” compensator. Refer to page

28 for proper adjustment.

2. Improper operating technique. Too much film tension, make

sure film is relaxed prior to sealing.

3. Check Band Ribbon to see if cleaning or replacement is

necessary.

TROUBLESHOOTING—WEAK SEALS AND/OR POOR FILM CUT-OFF

Page 39

SS-2028MK Sealer Service Manual

4. Burned PTFE tapes 1/2” or 3/4” replace. If PTFE tapes

become burned or worn, weak seal may occur. See page 56

for Replacement Instructions.

5. Wavy silicone rubber sealing pad. Replace. (See instructions

on page 57.)

6. Seal pad pressure incorrect. (See page 58.)

7. Hold-down pressure uneven or incorrect on magnets. (See

page 61 for instructions.)

8. When seal bar is lowered, the gap between the lower magnet

and the upper magnet clamp should be 1/8”.

TROUBLESHOOTING—WEAK SEALS AND/OR POOR FILM CUT-OFF

Page 40

F6 – 2 AMP

F5 – 3 AMP

F4 – 2 AMP

F3 – 15 AMP

Not set at zero.

SS-2028MK Sealer Service Manual

CONVEYOR – WILL NOT RUN

1. Check conveyor timer. Make sure it is not set at zero.

2. Check conveyor fuse F-6, 2 AMP, wire 18 and 19.

TROUBLESHOOTING—CONVEYOR WILL NOT RUN

Page 41

Drive Roller Adjustment Screw

SS-2028MK Sealer Service Manual

3. Check conveyor belt and make sure it is not adjusted too

tightly. Adjust conveyor belt using Drive Roller Adjustment

Screw.

4. Check that conveyor motor sprocket set screws are not loose

on shaft.

5. Check that conveyor chain is not jammed or broken.

6. Make sure wires number 19, 20 and 7 are connected to the

conveyor motor.

TROUBLESHOOTING—CONVEYOR WILL NOT RUN

Page 42

SS-2028MK Sealer Service Manual

7. Make sure wires number 20 and 7 are connected to C1

capacitor.

8. Make sure RL1, 220V relay is secure in relay socket and points

are not burnt.

TROUBLESHOOTING—CONVEYOR WILL NOT RUN

SS-2028MK Sealer Service Manual

Dual Magnets

F6 – 2 AMP

F5 – 3 AMP

F4 – 2 AMP

F3 – 15 AMP

Sealing Time

Not at Zero

MAGNET WON’T HOLD DOWN

Page 43

1. Seal head will not stay down – sealer operates normally

otherwise.

2. Check seal timer (TR2) setting. Make sure it is not set at zero.

Also, check to see if burned or damaged.

3. Check magnet hold down fuse F5, 3AMP, wire 27 and 29.

TROUBLESHOOTING—MAGNET WON’T HOLD DOWN

Page 44

Wires 27

Wires 28

SS-2028MK Sealer Service Manual

4. Check for 220 Volts (nominal) to primary of transformer (T1).

5. If voltage is present to primary winding of transformer (T1),

check for 24 (nominal) volts output from secondary of

transformer.

6. Check for 24 (nominal) volts DC output from + (positive) and –

(negative) wires number 27 and 28 on terminals of rectifier. If

no DC voltage, replace rectifier.

TROUBLESHOOTING—MAGNET WON’T HOLD DOWN

Page 45

Wire 28

Wire 29

SS-2028MK Sealer Service Manual

7. Check for circuit continuity through windings of hold-down

magnets. Check on terminal strip wires 28 and 29.

Disconnect from terminal strip before testing.

TROUBLESHOOTING—MAGNET WON’T HOLD DOWN

Page 46

Film brake.

SS-2028MK Sealer Service Manual

EXCESSIVE FILM DRAG

1. Check for proper film threading. (See diagram on page 23.)

2. Loosen film roll brake.

3. Make sure film guide rolls are not restraining roll from turning

freely.

TROUBLESHOOTING—EXCESSIVE FILM DRAG

SS-2028MK Sealer Service Manual

Film brake.

EXCESSIVE FILM WINDING OR “SPILL”

Page 47

1. Tighten film roll brake.

TROUBLESHOOTING—EXCESSIVE FILM WINDING

Page 48

SS-2028MK Sealer Service Manual

MAINTENANCE

MICRO KNIFE BAND RIBBON COMPENSATOR ADJUSTMENT

Adjustment of the Band Ribbon compensator may be required
under the following conditions:

1. During continuous use. After about 15 minutes of sealer
operation, check seal quality and, if required, reset
compensator. This may be necessary as a result of heat
buildup in the sealing head, or stretching of Band Ribbon.

2. After installing new Band Ribbon, make sure the Band
Ribbon lies properly over the entire length of the seal bar
in the channel.

3. If charring of film is noted, there is too much heat.

4. If sealing is incomplete, there is not enough heat.

To adjust the Band Ribbon compensator, refer to the

adjustment instructions on the following pages:

MAINTENANCE – BAND RIBBON COMPENSATOR ADJUSTMENT

SS-2028MK Sealer Service Manual

All Films Except Polyethylene

Page 49

Adjust the Band Ribbon compensator (located at the left end of
the front seal bar) by loosening the wing nut and turning the
knurled-head screw until a 1/4” air gap exists. With folded film (i.e.
two layers of film) in the sealing position, bring down the sealing
head. Set the seal timer for a 1/2 to 2 setting then examine the seal.
Experimentally, in small increments, increase the Band Ribbon
compensator air gap setting until a setting is obtained which yields a
satisfactory seal and film cut off. It is important to remember that
the smallest air gap at which a satisfactory seal and film cut off is
obtained is the correct setting. If using PVC film we recommend
using a special silicone rubber for the bottom seal pad.

MAINTENANCE – BAND RIBBON COMPENSATOR ADJUSTMENT

SS-2028MK Sealer Service Manual

Polyethylene Films

Page 50

On the Band Ribbon compensator, loosen the wing nut and
turn the knurled-head screw until a 1/4” air gap exists. Tighten the
wing nut. With folded film (e.g., two layers of film) in the sealing
position, bring down the sealing head. Set the seal timer to position
1 or 2 on the timer dial setting.

Ordinarily, it will not be possible to obtain a satisfactory seal
with the 1/4” gap setting. Experimentally, in small increments,
increase the Band Ribbon compensator air gap setting until a setting
is obtained which yields a satisfactory seal and film cut off.

Note: Any time you are using polyethylene films, we

recommend a 2” x 3 mill PTFE cloth or tape be placed
over the Band Ribbon for a better seal and for
best performance.

MAINTENANCE – BAND RIBBON COMPENSATOR ADJUSTMENT

Page 51

SS-2028MK Sealer Service Manual

BAND RIBBON REPLACEMENT

The Band Ribbon is subject to constant wear and will
eventually require replacement as the PTFE coating eventually
wears off. To replace Band Ribbon, proceed as described below.

Replacing Micro Knife Band Ribbon

1. Loosen Allen screw on backside of compensator to loosen band

ribbon.

2. Using a 2mm Allen wrench, loosen corner screw.

MAINTENANCE-BAND RIBBON REPLACEMENT

Page 52

Holding Screw

SS-2028MK Sealer Service Manual

3. Loosen screw holding Band Ribbon in place on front seal bar.

4. Loosen screw on back side of “side” seal bar compensator.

MAINTENANCE-BAND RIBBON REPLACEMENT

Page 53

SS-2028MK Sealer Service Manual

Note: Once screw is loosened spring loaded compensator will

expand.

5. Remove old micro knife.

MAINTENANCE-BAND RIBBON REPLACEMENT

SS-2028MK Sealer Service Manual

6. Take new micro knife band ribbon and bend corner

approximately 90 degrees.

Page 54

7. Cut a piece of 3 mill PTFE tape and wrap around band ribbon

before inserting into corner-block of seal bar.

8. Push band ribbon into corner block until it is fully seated at

bottom of channel. Cut off excess PTFE tape to insure good

corner seal.

MAINTENANCE-BAND RIBBON REPLACEMENT

SS-2028MK Sealer Service Manual

9. Insert band ribbon into remaining length of channel.

Page 55

10. Push spring loaded compensator forward and tighten lock

screw.

11. Cut off excess length of band ribbon.

MAINTENANCE-BAND RIBBON REPLACEMENT

SS-2028MK Sealer Service Manual

Page 56

Important:

After replacing Band Ribbon, be sure to adjust

the setting of the element compensator. See
page 28 for instruction.

MAINTENANCE-BAND RIBBON REPLACEMENT

Page 57

SS-2028MK Sealer Service Manual

TAPE REPLACEMENT

The item most subject to wear on the sealer is the PTFE tape
used to cover the silicone sponge rubber on the sealing bar.
This ¾”x 10 mill tape should never be permitted to burn
through. To replace tape, proceed as follows:

1. Strip off old tape.

2. Cut off proper length of new PTFE, peel off backing, and
press new tape into position.

3. Apply ½” x 10 mill PTFE tape over the top of the ¾”
PTFE tape.

MAINTENANCE-TAPE REPLACEMENT

SS-2028MK Sealer Service Manual

SILICONE RUBBER SEALING PAD REPLACEMENT

Occasionally it will be necessary to replace the silicone rubber

sealing pads. This should be done if the following is noted:

 Gaps in the seal
 Weak seals
 Improper film cut-off
 Excessive sealing pressure required

To replace rubber, proceed as follows:

Page 58

1. Seal pads are designed with a channel for easy
replacement. Pull silicone rubber out of the channel.

2. Replace with new silicone rubber. Press rubber back into
channel.

3. Install 3/4” - 10 mil PTFE tape on top of rubber.

4. Install 1/2” - 10 mil PTFE tape over the 3/4” tape.

MAINTENANCE-SEALING PAD REPLACEMENT

Page 59

SS-2028MK Sealer Service Manual

Sealing Pad Pressure Adjustment for Head Return Cylinder

Uniform pressure between the band ribbon and the sealing
pads must always be maintained for proper sealing uniformity, and to
prevent element hot-spots and premature burnout. This adjustment
should be checked periodically and should always be checked when
sealing gaps occur. Proceed as follows:

1. Loosen all five bolts on lower pads just enough to
maintain a moderate sliding pressure.

2. With sealing head resting on lower pads, make sure there
are no air gaps, then tighten the five bolts on the lower
pad.

3. Adjust magnets (see page 59 for magnet adjustment).

MAINTENANCE-SEALING PAD PRESSURE ADJUSTMENT

SS-2028MK Sealer Service Manual

Set Screws

Assembly Casting

Adjust Height of Seal Bar

Page 60

4. To raise or lower seal bar height, adjust seal head
cylinder assembly casting by loosening the three set
screws on shaft. Move assembly casting forward or
backward, then reset seal head by locking set screws.

5. Cycling head up and down, adjust set screw for proper
head speed and cushion.

MAINTENANCE –ADJUST HEIGHT OF SEAL BAR

SS-2028MK Sealer Service Manual

Band Ribbon Pulse Switch Adjustment

Page 61

The sealing cycle should not begin until the sealing head is

within 1/4” or less of the film to be sealed. If the magnets energize
before the head is within 1/4” of the film, loosen the lock-nut and

turn the screw (located at the rear end of the side seal bar) up
slightly (counterclockwise when viewed from above). The correct
adjustment has been obtained when the magnets energize just as
the seal bar comes into contact with lower pads.

MAINTENANCE—PULSE SWITCH ADJUSTMENT

Page 62

SS-2028MK Sealer Service Manual

Adjustment of Magnets for Correct Sealing Pressure

All magnets have been factory adjusted for equal sealing
pressure throughout the length of both the front and side seal bars.
However, if an adjustment is required, proceed as follows:

1. Disconnect the sealer’s power source.

2. Loosen the lower magnet bolts on all lower magnets so that the

magnets settle to their lowest position in the mounting slots.

3. Lower the sealer’s operating handle fully and lift lower magnets

to within 1/16” from the holders. Tighten the mounting bolts

securely to retain the proper adjustment.

MAINTENANCE—ADJUST MAGNET SEAL PRESSURE

Page 63

Conveyor

Adjustment

Screws

Bearing Block

Bolts

SS-2028MK Sealer Service Manual

Conveyor

From time to time, it will be necessary to disassemble the
conveyor as it will need adjustments or replacement of worn parts
and general maintenance. The following information is given to
assist the operator in that general fashion. If the problem does not
rectify itself with this general explanation, discuss it with
an authorized distributor of or with directly.

A. Adjust Discharge Conveyor Belt by loosening the Bearing Block

Mounting Bolts, then adjust the Conveyor Adjustment Screw in

to loosen belt, or out to tighten belt.

MAINTENANCE-CONVEYOR MOTOR REPLACEMENT

SS-2028MK Sealer Service Manual

Replacing Conveyor Motor

1. Disconnect power plug from source of power.

Page 64

2. Disconnect the three power wires from the rear of the motor.

3. Loosen the four bolts that hold the motor mount bracket to the

conveyor and slide motor mount forward.

4. Loosen set screws on sprocket that are attached to the motor

and remove sprocket.

5. Remove four bolts. These bolts hold the motor in place. Hold

motor while removing these bolts so the motor does not drop.

6. Follow steps 2-5 above in the opposite order to reinstall new

motor against the conveyor frame and tighten set screws.

MAINTENANCE-CONVEYOR MOTOR REPLACEMENT

SS-2028MK Sealer Service Manual

Wire #12

Wire #14

Wire #26

Replacing Front and Side Seal Bars

1. Turn power switch to off position.

Page 65

2. Remove wire #12 from side bar compensator.

3. Remove wire #14 from front bar compensator.

4. Remove wire #26 from temperature control bracket.

MAINTENANCE-REPLACING SEAL BARS

SS-2028MK Sealer Service Manual

Compensator Guide

Screw

5. Remove temperature control bracket.

NOTE: Bracket is held in place with two screws. Also, do not

lose the insulators.

Page 66

6. Compress front bar compensator all the way in using your

thumb and hold. Loosen Allen screw on compensator holding

Band Ribbon.

Warning: Remove compensator slowly, applying tension, as

compensator is spring loaded.

7. Remove compensator guide screw.

MAINTENANCE-REPLACING SEAL BARS

Page 67

Allen Bolt

Remove Allen Bolts

SS-2028MK Sealer Service Manual

8. Remove Allen Bolt holding front seal bar to the outfeed bar.

9. Remove bolts holding side seal bars to casting.

10. Remove seal head from entrance casting and outfeed bar.

11. Remove the side bar compensator following steps 6 and 7.

MAINTENANCE-REPLACING SEAL BARS

SS-2028MK Sealer Service Manual

12. Remove upper magnet holder on side bar.

Page 68

13. Remove handle.

MAINTENANCE-REPLACING SEAL BARS

SS-2028MK Sealer Service Manual

Channel Holding Screw

INSTALLATION OF TRANSITE CHANNELS

Front and Side Seal Bar

Page 69

1. Install corner block.

2. Remove the Allen screws holding channels in seal bar.

MAINTENANCE-INSTALLING TRANSITE CHANNELS

SS-2028MK Sealer Service Manual

Page 70

3. Remove Allen screw.

4. Remove transite channel and replace.

MAINTENANCE-INSTALLING TRANSITE CHANNELS

Page 71

Compensator Guide
Screw

Insulated Washer

SS-2028MK Sealer Service Manual

Installation of Band Ribbon Compensators and Temperature
Control Bracket

1. Lightly grease two compensator springs and put on each seal

bar.

2. Insert compensator and compress in all the way.

3. Install compensator guide screw assemblies.

4. On the front bar, install the temperature adjustment bracket.

MAINTENANCE-INSTALLING COMPENSATOR

Page 72

SS-2028MK Sealer Service Manual

Important: The temperature adjusting bracket must be

insulated from the casting to work properly.

5. Install new band ribbon and reset temperature adjustment

screw assembly.

6. Reconnect wires to seal head assembly.

(a) On the side seal bar, connect wire #12 to compensator

block.

(b) On the front bar, connect wire #14 to the compensator

block.

MAINTENANCE-INSTALLING COMPENSATOR

SS-2028MK Sealer Service Manual

(c) On the temperature adjusting bracket wire #26.

Page 73

7. Install upper magnet holder on side bar.

8. Install handle and tighten set screws on each end.

9. Double check all work done before starting the

machine.

MAINTENANCE-INSTALLING COMPENSATOR

SS-2028MK Sealer Service Manual

CR1

RL1

5

4

CR1

CR2

FUSE RATE

3

2

S1

4

2

F1

5

3

2

3

F2

L1

L2

GND

6

7

PL1

MG2

F1: 20A /250V
F2: 20A /250V
F3: 15A /250V
F4: 2A /250V
F5: 3A /250V
F6: 2A /250V

MG1

M1

+

AC

-

AC

T1

CR2

RL2

17

F6

20

C1

7

19

6

21

6

17

7

7

7

7

26

24V

25

23

24

22

29

27

F5

6

F3

10

9

26

26

25

RL2

7

7

16

TR1

18

VR1

L2

L1

C

NC

B

A

TR2

VR2

L2

L1

C

NC

B

A

31

30

32 33

RL1

RL1

MS1

RL2

F4

21

21

28

29

220V

BR1

PL1:
Power Switch
Indicator

VR1: Conveyor
Speed Potentiometer

TR1: Timer
(Discharge
Conveyor)

CR1:
Contactor
(Main Power)

S1:
Power Switch

M1: Conveyor Motor

TR2: Timer
(Sealing Time)

MS1: Pulse
Microswitch

T1: Step Down
Transformer

BR1: Rectifier

MG1,MG2:
Magnets

Compensator

VR2: Sealing Time
Potentiometer

RL1: Conveyor Relay

28

28

25

8

8 7

14

RL2:
Compensator Relay

T2: Pulse
Transformer

2614

CR2:
Contactor
(Pulse)

F1: Fuse (Main Power)
F2: Fuse (Main Power)

F6: Fuse (Conveyor Motor)

F3: Fuse (Pulse Transformer)
F4: Fuse (Step Down Transformer)
F5: Fuse (Magnets Hold Down)

C1: Capacitor

L-TYPE SEALER MODEL: 2028MK (220V)

INPUT VOLTAGE:

220V/ 60Hz, 20A

12

14

Micro Knife

T2

Page 74

ELECTRICAL DRAWING

SS-2028MK Sealer Service Manual

BR1

CR1

TR1

T1

F3

F4

F5

F6

RL1

VR1

S1

VR2

C1

F2

F1

TS1

RL2

TR2

T2

CR2

ELECTRICAL PANEL

DIAGRAM Controls for

SS-2028MK

Page 75

ELECTRICAL PANEL DIAGRAM

SS-2028MK Sealer Service Manual

Item

Part #

Qty

Parts List Nomenclature

S1

3400-45

Power On/off Switch

C1

3500-02

Capacitor – 3 MF 400 VAC

CR1

3400-13

Contactor Main Power

T1

1524-27

Stepdown Transformer – 220 Volt/24 Volt

M1

3400-16

Conveyor Motor

TR1

3400-76

Timer – Conveyor

CR2

3400-12

Contactor Pulse – 220 Volt

LS

3400-47

Pulse Limit Switch

BR1

1720-19

Rectifier

MAG 1 & 2

3400-76

Magnets Hold Down

TR2

3400-77

Timer – Sealing

RL1

3400-57

Conveyor Relay – 220 Volt

RL2

3400-56

Compensator Relay – 24 Volt

T2

3400-55

Pulse Transformer – 220 Volt

F1, F2, F3

3400-28

Fuse – 15 AMP 250 Volt

F5

3400-86

Fuse – 3 AMP 250 Volt

F4 & F6

3400-27

Fuse – 2 AMP 250 Volt

VR1, VR2

3400-68

Potentiometer

Page 76

MODEL SS-2028MK

SEALER

PARTS NOMENCLATURE

SS-2028MK Sealer Service Manual

Part #

Qty

Description

3450-01

1

Arm Casting – Long

3440-20

1

Arm Casting – Short

3450-75

1

Band Ribbon

3400-96

2

Bearing – Discharge Conveyor

3440-10

4

Bearing – Discharge Conveyor Stabilizer

3450-17

1

Belt – Discharge Conveyor

3400-95

1

Bracket – Actuator

3440-01

1

Bracket – Arm Return Cylinder

3440-42

2

Bracket – Transition Roller Mounting

1524-17

1

Bridge Rectifier

3440-41

2

Bolts – Short Arm Casting Mounting

3500-02

1

Capacitor – 3 MF 400 VAC

3400-03

4

Caster

3400-04

2

Chain – Master Link

3400-05

1.5

Chain – Riveted (per ft) Conveyor Motor

3440-43

4

Chain – Riveted (per ft) Discharge Conveyor
Adjustment

3440-44

1

Compensator Adjustment Screw

3440-81

2

Compensator Block – Stainless Steel

1521-49

1

Compensator Block Insulator – Fiber Washer

3400-07

1

Compensator Shaft – Long

3440-45

1

Compensator Shaft – Short

3440-46

2

Compensator Shaft Spring

3400-09

1

Conduit (per ft)

3400-11

1

Conduit Connector – Straight – ½ “

3400-12

2

Contactor – 3 pole – 35 AMP

3400-14

1

Conveyor Adjusting Bracket

3440-66

1

Corner Block

3440-02

2

Cylinder – Head Return

3440-47

4

Discharge Conveyor – 8” Threaded Adjustment
Bolts

SS-2028MK SEALER REPLACEMENT PARTS

Page 77

REPLACEMENT PARTS

SS-2028MK Sealer Service Manual

Part #

Qty

Description

3440-86

1

Discharge Conveyor – Nylon Take-up Block

3400-18

1

Drive Shaft

3450-20

1

Film Clamp – Front – Stainless Steel

3450-19

1

Film Clamp – Side – Stainless Steel

3400-23

4

Film Rack Bolts – 7mm x 1”

3440-48

2

Film Rack Guide Bolts

3400-25

2

Film Rack Guide Bolt Sleeve

3400-26

1

Film Rack Guide Knob

3450-24

2

Film Rack Roller – Complete

3400-22

4

Film Rack Roller Bearings – Large

3450-105

2

Film Rack Roller – Shaft

3450-21

1

Film Rack with Rollers – Complete

3440-51

1

Film Unwind Tension Adjust Knob

3440-50

1

Film Unwind Tension Plate

3400-27

1

Fuse – 2 AMP - Conveyor

3400-30

1

Fuse – 3 AMP

3400-28

2

Fuse – 20 AMP

3400-31

1

Fuse Holder

3440-03

1

Guard – Discharge Conveyor Motor

3400-32

1

Handle – Crank for Conveyor

3450-72

1

Handle – Front Seal Bar

3450-106

1

Idler Roller Assembly

3400-37

1

Knob for Conveyor Crank Handle

3440-04

1

Knob for Pin Perforator – Lower

3400-36

1

Knob for Pin Perforator – Upper

3400-35

2

Knob for Potentiometer

3400-40

2

Magnets

3400-41

2

Magnet – Upper

3400-43

2

Magnet Holder – Lower

3400-45

1

Main Power Switch

3400-46

1

Main Power Switch Plate

3440-54

1

Micro Switch Activation Bolt

3400-47

1

Micro Switch – Safety Override, Pulse, Conveyor

3400-16

1

Motor – Discharge Conveyor

Page 78

REPLACEMENT PARTS

SS-2028MK Sealer Service Manual

Part #

Qty

Description

3400-48

2

Pillow Block Bearing

3450-49

1

Pin Perforator Assembly Complete with Shaft

3440-11

2

Pin Perforator Base – Nylon

3440-59

2

Pin Perforator Safety Cover

3450-51

1

Pin Perforator Shaft

3400-52

2

Pin Perforator Wheel – 5/8” I.D.

3450-54

1

Product Separator Tray

3400-56

1

Relay – Compensator – 24 Volt

3400-57

1

Relay – Conveyor – 220 Volt

3400-58

2

Relay Base

3450-74

1

Roller – Discharge Belt – Drive and Idler

3450-73

2

Rollers – Transition

3440-06

2

Screw – Guide with Insulator

3440-62

1

Screw – Wing (Product Loading Tray)

3450-60

1

Seal Bar – Lower – Front (Bottom Pad)

3450-61

1

Seal Bar – Lower – Side (Bottom Pad)

3450-85

1

Seal Bar – Upper Front – Complete

3450-86

1

Seal Bar – Upper Side – Complete

3450-30

1

Seal Pad Sponge Rubber – Front

3450-25

1

Seal Pad Sponge Rubber – Side

3450-33

1

Shaft – Seal Head

3440-07

4

Shoulder Bolt – Film Clamps

3440-67

2

Spacer Film Clamp

3400-68

2

Speed Potentiometer (Vr1 & Vr2)

3440-22

1

Sponge – Handle

3440-08

4

Spring – Film Clamp

3450-69

1

Sprocket – Conveyor Drive Shaft

3450-71

1

Sprocket – Conveyor Motor

3400-72

4

Sprocket – Conveyor Up/Down

100002

1

100003

1

3400-73

1

Temperature Adjusting Bracket

1521-09

1

Temperature Adjustment Screw Assembly

3400-74

1

Terminal Strip – 12 Lug

Page 79

PTFE Tape – ½” x 10 mill

PTFE Tape – ½” x 10 mill

REPLACEMENT PARTS

SS-2028MK Sealer Service Manual

Part #

Qty

Description

3400-76

1

Timer – Conveyor

3400-77

1

Timer – Seal

3400-55

1

Transformer – Pulse 220 V

1524-27

1

Transformer – Stepdown 220 V to 24 V

3450-90

1

Transite Channel – Front

3450-91

1

Transite Channel - Side

3440-09

4

Washer Stainless Steel – Film Clamp

Page 80

REPLACEMENT PARTS

SS-2028MK Sealer Service Manual

Item

#

Part #

Description

Qty.

Price

1

3450-75

Band Ribbon

1

2

3440-66

Corner Block

1

3

3400-27

Fuse – 2 AMP

2

4

3400-30

Fuse – 3 AMP

2

5

3400-28

Fuse – 15 AMP

2

6

3450-15/20

Seal Pad Rubber – Front and Side

1/set

8

1350-08

1 RL

9

1350-14

1 RL

10

3450-90/91

Transite Channel – Set

1

11

3400-47

Impulse switch

1

12

3400-76

Timer board

1

13

3400-12

Contactor

1

Total Cost

$Call

Spare Parts

List SS-2028MK

Page 81

½” x 10 mill x 10 yrd. PTFE
Tape
¾” x 10 mill x 10 yrd. PTFE
Tape

9/17/15

Replacement Parts