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The Complete Guide to 3M Polygun PG II: Spare Parts and Troubleshooting


The Complete Guide to 3M Polygun PG II: Spare Parts and Troubleshooting

3M Polygun PG II: Spare Parts and Troubleshooting

The 3M Polygun PG II pneumatic glue gun is perfect for many industrial applications. With its hands-free mount and foot pedal system, it's easy to use this tool for hours at a time. Its reliable performance stands up to high-volume projects with remarkably little upkeep.

Did you know we do repairs on the 3M Polygun PG II - Check it out here

If you do experience problems with this low-maintenance glue gun, don't worry! It's easy to find spare parts on this website. Buy them in advance to prevent interruptions in your work, or use our complete guide to 3M Polygun PG II spare parts and troubleshooting to find the parts you need to continue your project. With clear troubleshooting instructions, your glue gun will be working smoothly again soon.

Be Prepared: Recommended Spare Parts

If you have more than one 3M Polygun PG II in your facility, it's a good idea to keep a few parts on hand in case something goes wrong. Engineers designed this glue gun for excellent durability and heavy use, but parts will wear over time. Use this simple guide to determine which 3M Glue Gun Spare Parts you should keep on hand based on the number of glue guns in use. 

  • 2-5 3M Glue Guns in Use
  • 1 regulator kit
  • 1 thermostat/TCO kit
  • 1 valve kit
  • 6-10 3M Glue Guns in Use
  • 1 heat shield kit
  • 1 regulator kit
  • 2 thermostat/TCO kits
  • 2 valve kits
  • 11-15 3M Glue Guns in Use
  • 1 trigger kit
  • 1 heat shield kit
  • 2 regulator kits
  • 2 thermostat/TCO kits
  • 1 switch kit
  • 1 heater kit
  • 3 valve kits
  • 1 dump valve kit
  • 1 hose assembly kit
  • 16-20 3M Glue Guns in Use
  • 1 trigger kit
  • 2 heat shield kits
  • 2 regulator kits
  • 1 power cord kit
  • 3 thermostat/TCO kits
  • 1 switch kit
  • 1 hose kit
  • 1 handle kit
  • 1 heater kit
  • 4 valve kits
  • 1 dump valve kit
  • 1 hose assembly kit

Troubleshooting Guide for Specific Issues

Adhesive Flows Slowly or Does Not Flow

This common problem has several possible causes. Test them in the following order to find the source of the problem and its solution.

    1. Hung adhesive stick: The most common cause of slow or no flow is an adhesive stick that gets stuck. Turn the power on and let the glue gun heat for at least one hour. Set the incoming air to 80 psi and eject the adhesive from the glue gun. If this does not work, remove the nozzle to take out one adhesive stick. Reset the incoming air to 80 psi. The gun should now work. If the adhesive is still slow or doesn't flow, try the next step.
    2. Low Air Pressure: To check the air pressure, set the air pressure to 80 psi and check the in-line filter. If clogged, disconnect it from the air hose and blow compressed air through the filter in the "reverse flow" position. If air flow does not increase, replace the swivel filter. If you're still having problems,check the electricity.
    3. No Electricity: Ensure that you have power and the lighted switch is in the "on" position. If the issue does not resolve, continue to step 4.
    4. Dirty Nozzle Valve: Remove the nozzle valve and clean it. Run an entire adhesive stick out before replacing the clean valve assembly. 
    5. Regulator Malfunction: Squeeze the trigger and pull the retract knobs. If it's easy to pull them back, you need a new regulator. Install it easily with this regulator repair kit.
    6. Heater Problems: If it's difficult to pull the retract knobs, your regulator is fine. Check the heaters for electrical continuity. To start this process, disconnect the electrical and compressed air services. Remove the heat shield, leaving the heaters connected to the block. Starting with the left front heater, remove only one wire from its connection on the terminal strip. Use a Volt/Ohm meter to test the electric current. Touch one probe to the connector of the wire you removed. With the other probe, touch the matching connector on the opposite side. If the needle on your Volt/Ohm meter swings, the heater is fine. Reconnect the wire you removed. Repeat the check with the right front heater, followed by the right rear and left rear heaters. If the needle swings on each one, continue to the next step. If the needle doesn't swing on one or more of the heaters, replace the heater. This affordable heater repair kit comes with four brand new heaters.
    7. Jammed Slugs: If none of the solutions above fix the problem, you probably have a jammed slug. To free the jam, retract the piston and roll the applicator to one side. The adhesive in the magazine will free itself. Push the knobs forward until the piston touches the adhesive that is still in the chamber. Roll the applicator back to its normal operating position and continue removing the adhesive until you hear a whistling sound or until the piston has gone its entire length. 

    3m PG II Gun Has No Heat

    If there is no heat, replace the thermal cutoff. Use the thermostat/TCO repair kit to fix the problem. The thermostat and TCO are a single unit, so you'll replace both.

    Dripping Nozzle

    A dripping nozzle is the result of one of the following problems. Check them in this order for best results.
      1. Regulator Malfunction: Make sure your finger is off the trigger and try to retract the piston. If it is very difficult to pull it back, the air regulator is not shutting off properly. Use this kit to replace the regulator.
      2. Expanded Adhesive Stick: Remove the adhesive stick and try a new one.
      3. Worn Nozzle Valve: If none of the solutions above fix the problem, replace the nozzle valve assembly

      Other Relevant Spare Parts

      For those who use their 3M glue guns frequently or manage an operation where many industrial glue guns are in use, it's wise to stock several other 3M Polygun PG II spare parts. The heat shield repair kit is one of the easiest 3M Polygun PG II repairs. If you continue to have problems with slow adhesive flow, try the heat block repair kit or fix the transport mechanism

      For further assistance with 3M glue gun repair or 3M glue gun spare parts, please contact us. We are always ready to help you keep your industrial glue gun in great shape.