How to Troubleshoot a Lagler Hummel

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If it's possible for a floor sanding machine to achieve legendary status, the Lagler Hummel has done so for over 40 years. The German-made belt sander is the acknowledged preference of professionals around the world for finishing surfaces ranging from fine, soft-wood mosaic floors all the way to roller skating rinks.

The Lagler Hummel prepares all kinds of wood floors for refinishing.

Its rubber-coated drive drum has three-stage pressure regulation and the intake system offers efficient dust extraction into a high-capacity bag. A 230-volt AC motor outputs 2.2 KW of power, driving a 7.8-inch wide, 29.5-inch long sanding belt at 2,880 r.p.m. A worn belt can be changed in seconds. The Lagler Hummel is designed for dry sanding only and not approved for sanding of any wet surface.

Sander Does Not Run

  • Check the connection to the AC power outlet.

  • Make sure circuit breakers or fuses controlling the AC power outlet have not tripped or blown.

  • Allow the sander to cool down if it has overheated from heavy use and tripped the thermal protection switch.

    • Motor Attempts to Start but Falters

  • Allow the sander to warm to room temperature if it has been stored in a cold environment.

  • Evaluate the extension cords in use. Extension cords with strands less than 2.5 mm in diameter should not be used. Excessively long extension cords should not be used.

  • Test the tension of the V-belts driving the drum. Adjust it according to the manufacturer's recommendations.

    • Motor Produces Insufficient Power

  • Make sure the drive elements are not binding or sticking.

  • Verify that the abrasive grit of the sanding belt is not too coarse for the wood surface being sanded. Substitute lighter grit if necessary.

  • Allow the sander to warm to room temperature if it has been stored in a cold environment.

  • Evaluate the extension cords in use. Extension cords with strands less than 2.5 mm in diameter should not be used. Excessively long extension cords should not be used.

  • Test the tension of the V-belts driving the drum. Adjust it according to the manufacturer's recommendations.

    • Excessive Noise And Vibration

  • Look for excessive wood dust or dirt deposits on the sanding drum and tensioning rollers.

  • Inspect the sanding belt for damage.

  • Make sure the sanding belt is tracking correctly. Adjust if necessary.

  • Look for blockages or deposits in the motor air intake duct or fan housing.

    • Excessive Dust

  • Verify that the dust bag is not over-filled, incorrectly mounted or damaged.

  • Check the integrity of the bumper sealing felt that seals the drum housing to the floor surface.

  • Look for blockages anywhere in the suction system and clear them if necessary.

  • Check the tension of the V-belt that drives the suction system and adjust it if necessary.

  • Make sure the side cover of the machine is correctly installed.

    • Streaks, Scratches or Wavy Appearance in the Sanded Floor

  • Inspect the sanding belt and sanding drum for damage.

  • Verify that the abrasive grit of the sanding belt is not too coarse for the wood surface being sanded. Substitute lighter grit if necessary.

  • Make sure the wheels are not damaged, dirty or greasy.

  • Test the tension of the V-belts driving the drum. Adjust it according to the manufacturer's recommendations.

  • Check the integrity of the linkage from the lowering lever to the drum-lowering mechanism. Make sure it is not binding or inoperative.

  • Verify that the sanding drum pressure setting is correct.

  • Make sure that the operator is not pushing too hard on the machine during sanding or using some other improper work method.

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