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Heat  Sealing  Equipment  for  Mil-Spec &  Industrial  Bag  Packaging  Applications

Troubleshooting Tips and Part # Information

Doboy B-550M Continuous Band Sealer

Following are recommended tips for troubleshooting Doboy B-550M Validatable Continuous Band Sealer 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

One Heat Element Does Not Get Hot

(Applies to B-550M)

Heating Element wires may be loose or element is burned out. 

Check connections at temperature controller.  If both are tight, disconnect and check for continuity across heat element  wires.  

Solution: If no continuity, replace Heater Harness Assembly.

Neither Heat Element Gets Hot

(Applies to B-550M)

Temperature controller may be broken.

Solution: Refer to Temperature controller manual and replace if necessary.

Seal Pressure

(Applies to B-550M)

What Seal Pressure setting is recommended?

Solution: Bosch recommends a seal pressure of Not More Than (NMT) 30 PSI be used. Most customers utilize seal pressures in the 20-25 PSI range.

General Machine Set-up:

(Applies to Doboy B-550)

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

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* 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

Parts for Doboy B-550M Series Machines
Spare Part # Description
10 * 8-110-910-200 Sealing Band - Teflon-coated (sold in sets of two)
2 * 8-110-627-793 Heating Element (B-550M)
2 * 603237 Thermocouple Assembly with Grommet (B-550M)
  401380 Back-up Sleeve (Rubber Roller) - Replaced by #8-110-910-404
  8-110-910-404 Assy Back-up Sleeve (Rubber Roller) - Replaces #401380
  364181 Bearings [two (2) per each Compression Roller]
  401327 Kit - Idler Pulley - Smooth (Replaces #472029)
  401329 Kit - Idler Pulley - 32-Teeth (Replaces #472030)
2 * 372192 Trimmer Blade (B-550M uses two, identical trimmer blades)
2 * 8-110-627-803 Fuse - 7 Amp
1 * 8-110-102-010 Fuse - 5 Amp
1* 440644 Fuse - 10 Amp
2 * 401002 Spring - Compression
4 * 401276 Belt Guide - Stationary
4 * 401275 Belt Guide - Moveable Set
8 * 401179 Spring - Compression
  215085 Watlube Heat Release - provides a barrier to oxidation of heater elements

NOTE: A * in the "Spare" column denotes a part that is recommended as a common spare part for this machine. If a number is listed, that quantity is typically included in the New Machine Spare Parts Kit Option available when ordering a new machine.  Trimmer and Coder spare part components with a quantity and * are included only with the respective Trimmer and Coder New Machine Spare Parts Kit Options. (Spare Parts Kit contents are subject to change without notice.)

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