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Troubleshooting Tips and Part # Information

BOSCH / Doboy B-500 and Doboy B-450 Continuous Band Sealers

Following are recommended tips for troubleshooting Doboy B-500 and Doboy B-450 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-500 & B-450)

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-500 & B-450)

Temperature controller may be broken.

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

Oil Discovered in Motor

(Applies primarily to B-500M Horizontal - Style C & Style D machinery)

There is an oil seal between the motor and the gearbox.  While seals and journals are of high quality, the seal has a finite life.

Motors positioned with the gearbox above the motor (Style C&D Sealers) will eventually see some leakage of gearbox lubricant back into the motor as the seal wears out.  To prevent this occurrence, even in the long term, the gearboxes may be filled with grease rather than the standard gear lube when they are to be positioned vertically, gearbox above motor.  The grease is too heavy to migrate around a worn seal or journal.

"E-7" error code displayed on Temperature Controller

(Applies to B-500)

Thermocouple wires are loose or broken.

Check thermocouple wires at temperature controller.  Make sure connections are tight.  If they are and "E-7" error still appears, detach wires from temperature controller and check for continuity across thermocouple wires.

Solution: If no continuity, replace thermocouple (i.e. Heater Harness Assembly)

General Machine Set-up:

(Applies to Doboy B-500)

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 www.DoboyParts.com)

Parts for Doboy B-500 Series Machines
Spare Part # Description
8 * 281876 Sealing Band - Teflon-coated (two per machine)
2 * 452221 Heating Element w/ Thermocouple
* 372192 Trimmer Blade - for powered rotary trimmer models
  383363 Gearmotor - Standard Speed Range (Machine Style A & D)
  441404 Gearmotor - Standard Speed Range (Machine Style B & C)
  441534 Gearmotor - 1000 IPM Speed Range (Machine Style A & D)
  441540 Gearmotor - 1000 IPM Speed Range (Machine Style B & C)
  281851 Bag Carrier Belt
  161259 Drive Belt
2 * 286763 Fuse - 6 Amp
1 * 281697 Fuse - 5 Amp
1* 282808 Fuse - 10 Amp
  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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Parts for Doboy B-450 Series Machines
Spare Part # Description
* 281876 Sealing Band - Teflon-coated (two per machine)
  287404 Heating Element
  268340 Thermocouple
* 372192 Trimmer Blade - for powered rotary trimmer models
  383363 Gearmotor - Standard Speed Range (Machine Style A & D)
  441404 Gearmotor - Standard Speed Range (Machine Style B & C)
  441534 Gearmotor - 1000 IPM Speed Range (Machine Style A & D)
  441540 Gearmotor - 1000 IPM Speed Range (Machine Style B & C)
  281851 Bag Carrier Belt
  197580 Drive Belt
2 * 286763 Fuse - 6 Amp
1 * 281697 Fuse - 5 Amp
1* 282808 Fuse - 10 Amp
  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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