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Troubleshooting Tips and Part # Information

Doughboy HS-C & BOSCH Doboy HS-CII Portable / Tabletop Sealers

Following are recommended tips for troubleshooting Doboy HS-C and Doboy HS-CII problems.  You will also find a list of part numbers and descriptions for commonly used parts.

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Preventative Maintenance & Proper Use Tips*

Area of Machine

Advice / Technique

Changing Sealing Bands & Band Wicks

(Applies to HS-C)

When the Teflon wears off of your HS-C's sealing bands or if the bands get scratched, kinked, or broken, they will need to be replaced.

To change the bands on an HS-C, unplug the machine and remove the bottom guards.  Press the discharge-end (idler) band wheels (pulleys) in against their spring-loaded cams to take tension off one of the the sealing bands.  Slip the worn sealing band off of the Idler pulley, pull it out of the heater bar/cooling bar slot, then remove it from the drive pulley.  Repeat the process for the other sealing band.

Reverse the process to install new sealing bands - install one band at a time - place the new band over the drive-end pulley (the pulley at the motor end of the machine), then slip the band carefully down between the cooling and heater bars.  Finally, press on the Idler Pulley (against the tension spring/cam) and slip the new band onto the Idler Pulley.  Release the pulley to put tension on the band.  Make sure the outside edge of the sealing band is fitted into its respective Band Wick.

Repeat the process for the second band.

The Band Wicks are intended to "wipe" the Teflon surface of the sealing bands.  The Sealing Band should run through one of the two slots in the band wicks and the band wicks should be inserted into the sealer frame with the slot openings facing the bottom of the machine.  The Band Wicks help to keep the Teflon clean.  Band Wicks can be rotated so that when one slot gets dirty, the second slot can be used to clean the band - allowing you to double the life of a band wick.

If the gap between the heater bars becomes occluded (clogged) with burned-on residue, the bars will likely need to be removed, cleaned, and polished.  It is NOT recommended that the user attempt to remove the heater bars because replacing them properly is difficult and critical to proper sealer operation.  If this occurs, please contact BaggingGuys about our Ship-In Service for Doboy Portable Sealers!

Changing Sealing Bands & Band Wicks

(Applies to HS-CII)

When the Teflon wears off of your HS-CII's sealing bands or if the bands get scratched, kinked, or broken, they will need to be replaced.

To change the bands on an HS-CII, unplug the machine and remove the plastic guards.  On one side of the machine, press the infeed end (idler) Band Wheel (pulley) Assembly in against their spring-loaded pins.  Push the loose metal clip up behind the head of the shoulder screw (the one that retains the tension assembly and the band tension springs) to lock the tension assembly in (and keep tension off the pulley and bands.)  Slip the worn sealing band off of the Idler pulley, pull it out of the heater bar/cooling bar slot, then remove it from the drive pulley.  Repeat the process for the other sealing band.

Reverse the process to install new sealing bands - install one band at a time - place the new band over the drive-end pulley (the pulley at the motor end of the machine), then slip the band carefully down between the cooling and heater bars.  Make sure the outside edge of the sealing band is fitted into its respective Band Wick.  Finally, put it on the Idler Pulley and snap the clip out from behind the should screw to restore tension to the sealing band.  Repeat the process for the second band.

The Band Wicks are intended to "wipe" the Teflon surface of the sealing bands.  The Sealing Band should run through one of the two slots in the band wicks and the band wicks should be inserted into the sealer frame with the slot openings facing the bottom of the machine.  The Band Wicks help to keep the Teflon clean.  Band Wicks can be rotated so that when one slot gets dirty, the second slot can be used to clean the band - allowing you to double the life of a band wick.

If the gap between the heater bars becomes occluded (clogged) with burned-on residue, the bars will likely need to be removed, cleaned, and polished.  It is NOT recommended that the user attempt to remove the heater bars because replacing them properly is difficult and critical to proper sealer operation.  If this occurs, please contact BaggingGuys about our Ship-In Service for Doboy Portable Sealers!

Melted Bag Material on Heater Bars

(Applies to HS-C and HS-CII)

Melted Poly in Doboy HS-C Heater Bars

Polyethylene Bag Melted in HS-C

heater bars as received from customer

Melted Polyethylene in Doboy HS-C Heater Bars

Another shot of melted poly on Heater Bars!

Call us for Service: 

BaggingGuys' Ship-In Service

(Click photos for larger Detail Photo)

If you accidentally overheat your Doboy HS-C or Bosch Doboy HS-CII Continuous Band Sealer or, if you put too much bag top up inside the sealer, polyethylene bags can become molten and will melt fast to the interior of the machine (see photos to left).  This is especially true if the bag top is directly exposed to the heater bars!

To minimize the chance of melting bag material inside your sealer, follow this advice:

1) Only heat-up your sealer to a temperature that yields the desired seal.  Overheating the material increases the chance of melting the bag top inside the sealer and also can thin the film at the seal resulting in a greater chance of seal failure.

2) Place only as much material into the sealer (i.e. extra bag top above the seal area) as is required to locate the seal where you need it.  The HS-C series sealers can accommodate about 1.25" of excess bag top above the seal, but if you are using soft, thin plastic it will "flop around" inside the machine and will likely rub against the top of the heater bars causing a "bread bag on a hot toaster" result.

If the gap between the heater bars becomes occluded (clogged) with melted and / or burned-on residue, the sealing bands and heater bars will likely need to be removed, cleaned, and polished.  It is NOT recommended that the user attempt to remove the heater bars because replacing them properly is difficult and critical to proper sealer operation.  If this occurs, please contact BaggingGuys about our Ship-In Service for Doboy Portable Sealers!

Loose Metal Clip Inside HS-CII

(Applies to HS-CII)

My HS-CII has two loose metal clips near the end where I insert the bag - The clips are loose and they rattle around !?!

Called "Clip C" in the User Manual - the HS-CII has two bent metal tabs with something of a “T” shape at the end of them. These metal tabs are supposed to be loose enough so that they flop around a bit, but not so loose that they can rotate around the screws that attach them to the respective L-shaped, aluminum brackets. There is one tab on each side of the machine. Their purpose is hold tension off the bands when you are removing and installing new sealing bands. Consult Figure 2 in the "Band Replacement" section of your User Manual – the metal tab is “Clip C”. When you push in on the L-shaped aluminum brackets (to which each idler band pulley is attached), you can push each of the metal tabs down behind the heads of the cap screws to keep the bracket in the compressed position, allowing easier removal and installation of the sealing band(s).

Interior Cleaning

(Applies to HS-C and HS-CII)

Use compressed air to regularly blow accumulated dust off of the exterior and out of the interior of the machine.

Sealing Band & Band Wick Inspection

(Applies to HS-C and HS-CII)

Periodically, inspect the HS-C and HS-CII sealer's black, Teflon-coated metal sealing band for wear and scratch of the Teflon coating.  For most applications, the the Teflon is important - i.e. it prevents the bag from sticking to the sealing bands.

If you need to order replacement sealing bands or band wicks, let us know and we will provide you with a quote.  HS-C and HS-CII Sealing Bands are sold in 10-pack cartons.

Heater & Cooling Bar Gap Adjustment:

(Applies to HS-C and HS-CII)

For most applications, the gap between the sealing bands should be 75% of the total thickness of the material you are sealing (measured with a feeler gauge inserted at the heating and cooling bars, behind one of the sealing bands - DO NOT insert the feeler gauge between the sealing bands as it will likely scratch off the Teflon coating.)

We will gladly try to talk you through proper set-up of your machine - Call us!

Lubrication of Gears:

(Applies to HS-C and HS-CII)

The manufacturer recommends that you "1) Check Lubrication on a Monthly Basis or if sealer does not operate properly.  2) Brush a small amount of grease on the gear faces as necessary. and 3) Use Lubriko Hi Grease, or equivalent."  We caution you DO NOT over-lubricate!  Gears should have only a LIGHT COATING of grease on them.  While we offer the recommended Lubriko Hi Grease, any lithium-based grease suited to high-temperature use is useable.

My Doughboy HS-C Looks Like This:

Can I still get parts for It?

(Original HS-C Design [Pre-1970])

Not really.  The design of the Doughboy HS-C band sealer has evolved significantly since it was first built in the 1960s.  If your machine looks like the Pre-1970 machine in the photos above - i.e. Wooden Hand Grip, No bottom guards - (click the thumbnails for larger, detailed photos), most of the parts for your machine are obsolete and are no longer available.  A few of the parts are common to the newer, post 1970 HS-C design and may be available as new or pre-owned parts.  Call us for details.

BaggingGuys offers Pre-owned HS-C Sealers (1970-mid-1990s vintage) and new HS-CII Sealers, as well!

Duty Cycle (How Long Will It Last?):

(Applies to HS-C and HS-CII)

Owners and prospective buyers of the HS-C and HS-CII continuous band sealers often ask: "Can I use this machine all day", or "We operate a 3-shift packaging department - will the HS-C (or HS-CII) work 3-shifts", or "We want to keep the machine hot all day and only switch the motor on when we need to seal.  Is that OK?"

For the HS-C series sealers our reply is - YES, to the first two and NO to the final question.

Regarding the life span of a Doboy sealer - These Doboy portable sealers are well engineered, durable sealing machines.  We have customers still using original HS-C design machines with late 1960s and early 1970s serial numbers.  The HS-CII design was introduced in 1994 and it has proven to be just as reliable as the HS-C design.  Plus, the HS-CII is far easier to maintain and service.

Some customers use these machines once or twice a month, others run the sealers around the clock.  With proper care, either design will make your sealing operation(s) more efficient for many years to come.

Regardless of whether you use the HS-C series sealer for longer periods or intermittently throughout the day, because it's a band sealer with Teflon-coated, steel sealing bands, the operating recommendations are the same.

The steel bands on an HS-C series sealer should be moving, anytime the machine is heated to sealing temperature.  Stopping the motor / sealing bands while the heater bars are hot can result in deterioration of the steel sealing bands (i.e. the metal gets brittle and cracks) and premature wear of Teflon coating on the bands.  Therefore, you should start the machine's motor before warming up the heater bars and should turn down the temperature allow cooling  of the heater bars prior to stopping the motor.

We recommend letting the HS-C and HS-CII sealer motors run during brief breaks (e.g. a 15-minute coffee break).  For longer breaks (e.g. a lunch hour), we advise cooling down the heater bars and stopping the drive motor to reduce the mechanical wear and tear on the machine.  When you are ready to resume sealing operations, simply switch the drive motor on and turn the temperature knob back up to your desired seal temperature.  The HS-C / HS-CII should be ready to seal again in about 2-3 minutes.

Of course, for safety reasons, all Doboy sealers should be shut-down (and unplugged if possible) when they will not be used for an extended period - e.g. when finished for the day, overnight, weekends, etc.

Important - If you also use a Doboy HS-B or HS-BII Rotary Heat Sealer, please see the Duty Cycle advice about those machines on this page (Click Here).

If properly cared for and given timely preventative maintenance, a Doboy portable / tabletop sealer can provide you with decades of reliable sealing capability!

How Much Current Does It Draw?:

(Applies to HS-C and HS-CII)

The standard Doboy HS-C and Bosch Doboy HS-CII sealers both operate on 115 Volt / Single Phase / 60 Hz (Standard, US Household) electrical power.

The HS-C (older styles) sealers draw 3.6 Amps.  The Power rating on the HS-C is 400 Watts.

The HS-CII (current machine styles) sealers draw 2.35 Amps.  The Power rating on the HS-CII is 270 Watts.

The 220 Volt (50/60 Hz) version of the HS-CII (with either a UK or German electrical plug - choose one) draws 1.2 Amps.  The Power rating on the 220V HS-CII is 270 Watts.

Sealer Feed Direction:

(Applies to HS-C and HS-CII)

How do I make my Doboy Tabletop Sealer (HS-C or HS-CII) feed in the opposite direction? - e.g. The bags currently feed from the LEFT to the RIGHT and I want them to feed from the RIGHT to the LEFT (or vice versa)?

Assuming you have your sealer mounted to either the standard C-clamp (which comes with all new sealers) or the Optional Cast Iron Base - All you really do is turn the sealer around.  Here's how:

On an HS-CII - Using a 3 mm Allen Wrench (assuming you have the original, button-head screws); Simply loosen the two screws on the side that attach the HS-CII to its C-clamp bracket (or, optional Cast Iron Base), remove the sealer from the bracket, tighten the screws you just loosened, loosen the corresponding screws on the opposite side, turn the machine around, hang it on the bracket again (the bracket should be oriented so the machine is safely hanging in the slotted holes), then tighten the screws to secure the HS-CII to the bracket and you’re back in business – but, going in the opposite direction.

On a Doboy HS-C - Using a large, flathead screwdriver (assuming you have the original, pan head screws); Simply loosen and remove the two screws on the side that attaches the sealer to its C-clamp  bracket (or optional Cast Iron Base), remove the sealer from the bracket, turn the machine around, reattach it to the bracket using the screws you removed from the other side (the bracket should be oriented so the machine is safely hanging in the slotted holes), then tighten the screws to secure the HS-C to the bracket and you’re back in business – but, going in the opposite direction.

General Sealer Set-up:

(Applies to HS-C and HS-CII)

Many Doboy machines we receive for service have been user-adjusted in a way that defeats the machine's ability to operate properly.  The sealer is designed to have a fixed side and a spring-loaded side - this applies to the heater bars and the belt/chain guides.  We will gladly try to talk you through proper set-up of your machine - Call us!

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Troubleshooting Tips & Tricks*

Problem Possible Cause & Solution

Does not seal or does not seal uniformly:

(Applies to HS-C and HS-CII)

1) Lack of Adequate / Uniform Heat:

1a) With the machine cold and the guards off, pre-heat the machine and check each heater bar as the machine heats to make sure both heater bars are getting hot, independently - it's possible that one of the heat elements (most likely the one on the side opposite the thermostat) is burned out.  If one bar does not get hot, there is either a loose connection or a bad heat element.

1b) Does this machine have a temperature gauge on it?  If so, what temperature is it displaying when you have the Temp knob turned up the whole way?  Is this temperature similar to what you have used in the past (or on your other sealers?)  If your thermostat is getting too old (typically 3-5 years old) it will sometimes prevent the elements from getting as hot as they originally did.

2) Lack of Adequate / Uniform Pressure - If both elements are working, check the gap setting between the sealing bands (See Bar Gap Adjustment Tip above.)  If the gap is too wide, it can prevent efficient heat and pressure transfer to the bag.

3) Seal Area Contamination - check bag for contamination (e.g. product residue, dust, grease, oil, etc.)

PROBLEM: The Bodine V-10R Motor on my Doughboy HS-C Sealer Will Not Start

or Will Not Run.

(Applies to HS-C)

1) Bad Motor Switch - Check your motor On/Off switch to make sure power is being supplied to the motor when the switch is in the ON position.  If not, replace the switch (either a pushbutton switch on the end of the handle (call us for replacement details) or Part # 950644 (located on the top of the electrical enclosure), depending on the age of your machine.

2) Worn Motor Brushes - With the machine unplugged, carefully remove the motor brushes from each side of the motor.  A new brush measures about 3/4" OAL.  If your brushes are worn to less than 3/8", brush failure is a likely cause of your motor problems (or will be an imminent problem).  Replace the brushes (Part # 722-90243).

3) Motor Burned Out - If your switch is operable and your motor brushes are at least 3/8" OAL, it's likely that your motor is burned out.  Unfortunately, these Bodine motors are no longer available and cannot be repaired.  A Conversion Kit (Part # 457653) is available to replace the Bodine motor with a new Carter Motor (includes spacer plate, new motor mounting plate, and motor.)  This is a costly option, typically with a 4-6 week lead-time, but it is the only way to keep older model HS-series Doboy sealers running.  We offer rebuilt HS-C Sealers for slightly more than the cost of the Conversion Kit and your old machine may have trade-in value, depending on it's age, condition, and missing / present parts.  We also offer new Bosch Doboy HS-CII Sealers to replace your aging machine.

PROBLEM: Contact us with your problems.

(Applies to HS-C and HS-CII)

Contact us with your problems. We will post the solution here! Watch here for more solutions!

PROBLEM: I need service for my Doughboy Sealer or Doboy sealer.

(Applies to all portable Doboy / Doughboy Sealers)

If your Doughboy / Doboy sealer needs parts we can quote the parts.  However, unless you are an experienced mechanic who understands the operational principles of these sealers (e.g. why is there a fixed side and a spring-loaded side of the machine?) it's probably best that you do not attempt to service these machines yourself. 

BaggingGuys recommends you consider shipping your machine to us for repair evaluation and service.

Replacement and proper realignment of the power transmission and heating components on this sealer are critical and can be difficult if you do not have regular experience doing it.

* Machine troubleshooting & repairs should only be attempted by a qualified mechanic or electrician.  Power should always be disconnected prior to troubleshooting.

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Please see your factory instruction manual for additional troubleshooting tips.
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Common Replacement & Wear Parts (available at www.DoboyParts.com)

Parts for HS-CII Series Machines
Doboy Part # Description
335555 Sealing Bands for SIG Doboy and Bosch Doboy HS-CII (sold in 10-packs)
016-00087 Band Wicks (help extend life of Teflon coating on sealing band)
363563 Thermostat
359892 Heat Element
341388 Rocker Switch
273164 Grease for Gears
371257 Safety Guard (Right Side)
371256 Safety Guard (Left Side)
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Parts for older HS-C Series Machines
Doboy Part # Description
016-00090 Sealing Bands for Doughboy HS-C Heat Sealers (sold in 10-packs)
016-00087 Band Wicks (help extend life of Teflon coating on sealing band)
894-10002 Thermostat
672-11250 Heat Element
722-90243 Motor Brush - for Bodine V10-R Motor
722-90247 Spring for Motor Brush - for Bodine V10-R Motor
722-00242 Bodine V10-R Motor - DISCONTINUED - See # 457653 Conversion Kit
457653 Motor (Carter Motor Conversion Kit - Replaces original Bodine Motor)
463912 Motor Brush - for Carter Motor
950006 Drive Gear (Large)
950012 Tension Arm
273164 Grease for Gears
950644 Rocker Switch [Motor / Off / Heat Motor] (DPDT)
Call for Details Switch - Pushbutton (SPST)
951484 Safety Guard (Right Side)
951485 Safety Guard (Left Side)
539-00201 Blower Housing (OBSOLETE - Replaced with 8-110-911-651)
8-110-911-651 Blower Housing - Replacement for 539-00201 (Call us for lower-cost options!)
015-03216 Blower Tube
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