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Here, we will go over the main methods for troubleshooting problems with Lumina automatic spray guns (mainly the ST series, the HM series, and others) and the Magic Cut e-Mist. If the following troubleshooting methods are ineffective, or your problem is not covered, please contact us via the
Contact page.

Lumina automatic spray guns

  • There is no mist output even when air flow is let in.

    1. The liquid adjuster is not open.
      Please open the liquid adjuster by turning it 1.5 to 2 times.
      The spray gun’s internal valve (the piston set) is not functioning.
      Confirm that the air pressure supplied is around 0.3 to 0.5 MPa. If the spray gun body is not greased, please reapply grease. After greasing, reattach the piston set and manually confirm that it moves smoothly. If it does not move freely, it is highly likely that the P-11 O-ring attachment is worn or warped, so please replace it.*
      *Greasing instructions can be found in the maintenance manual on the catalog download page.
      The liquid nozzle is blocked.
      Remove the liquid nozzle and clean it or flush it out.
      The liquid mist amount is low.
      When using a gravity feed container, please make sure that it is installed at a high position. When using a high-viscosity liquid, please switch to a pressure feed tank.

  • Mist comes out even after the air supply is stopped.

    1. (For manually-operated air valves or solenoid valves) The two-way air valve is being used.
      Please use the three-way air valve.

  • Liquid leaks from the tip of the spray gun.

    1. There is dust or other foreign material stuck in the liquid nozzle.
      Remove the liquid nozzle and clean it or flush it out.
      The liquid nozzle or needle are worn.
      Replace the liquid nozzle and the piston set.
      Due to lack of grease or O-ring wear or warping, the piston set valve is not completely shut.
      Please reapply grease to the spray gun body and the piston set. After greasing, reattach the piston set and manually confirm that it moves smoothly. If it does not move freely, it is highly likely that the P-11 O-ring attachment is worn or warped, so please replace it.*
      *Greasing instructions can be found in the maintenance manual on the catalog download page.

  • It runs out of air.

    1. The liquid nozzle is loose.
      Please use the liquid nozzle’s dedicated wrench to tighten it properly.
      The P-3 O-ring inside the spray gun is worn and air penetrates into the liquid passageway.
      Please replace the P-3 O-ring with a new one.
      Air penetrates from the junction between the liquid nozzle and the main unit.
      Remove the liquid nozzle, clean the junction between the liquid nozzle and the spray gun body , then reattach it by tightening it properly. If the liquid nozzle is damaged, please install new replacements for the liquid nozzle and the piston set. If the spray gun body is damaged, repairs are not possible and the entire spray gun must be replaced.

  • Air is flowing backwards into the hanging container.

    1. The P-3 O-ring inside the spray gun is worn and air penetrates into the liquid passageway.
      Please replace the P-3 O-ring with a new one.
      The air cap has warped or been damaged in some way as to hinder the flow of atomizing air.
      Please replace the air cap with a new one.

  • The mist oversprays, getting the area dirty.

    1. The atomizing air pressure setting is too high.
      First set the atomizing air pressure between 0.02 and 0.05 MPa, then monitor the mist while gradually increasing the air pressure.
      You are using a spray gun with the spray gun body that contains a single air inlet, such as the ST-5, the HM-1, or the HM-3.
      Spray guns with single air inlet cannot have atomizing air pressure set to below 0.2 MPa, so they cannot create a soft mist. Please use the ST-6 series or the HM-6 series instead.

  • The liquid is not atomized enough (it comes out as a liquid)

    1. The atomizing air pressure is too low. The liquid pressure is too high.
      Please set the liquid pressure as low as possible within the range it can still be delivered in a stable manner. This depends on the viscosity of the liquid, but first use a setting from 0.02 to 0.05 MPa and gradually increase the liquid pressure while monitoring the flow of liquid inside the tube. Next, visually monitor the condition of the mist while gradually increasing the atomizing air pressure. When the liquid is not atomized enough even after increasing the air pressure, please adjust the spray gun body’s liquid adjuster or use a nozzle with a narrower size.

Magic Cut e-Mist

  • The air flow does not stop.

    1. The inlet and outlet of the air valve are attached to each other’s connections.
      Please reattach the air valve using the correct connections.

  • There is no air flow.

    1. The air volume adjuster is shut.
      Please open the air volume adjuster.
      The air valve is not open.
      Please open the air valve.
      There is something blocking the air passageway.
      Remove the line nozzle from the atomizer and remove the foreign object by, for example, blowing out the inside of the Teflon pipe with compressed air. (When removing the line nozzle, take care not to lose the O-ring at its base.)
      The tubes for liquid and air are attached to each other’s connections.
      Please reattach the tubes correctly. The one closer to the line nozzle is for the liquid tube.

  • Liquid does not come out.

    1. The piston valve inside the atomizer is not functioning.
      Please increase the air pressure to 0.3 MPa or above. If mist still does not come out, please reapply grease to the piston valve’s P-7 O-ring and the atomizer’s P-3 O-ring. After greasing and reassembling the piston valve, move it up and down with your hand. If it does not move easily, there is a high chance that the P-7 O-ring is worn or warped, so please replace it.
      The liquid tube is blocked.
      Remove the line nozzle from the atomizer and remove the foreign object by, for example, blowing out the inside of the Teflon pipe with compressed air. (When removing the line nozzle, take care not to lose the O-ring at its base.)

  • Air is flowing backwards into the container.

    1. The P-2 O-ring at the base of the line nozzle may be missing.
      Please reattach the P-2 O-ring.
      The liquid tube is blocked.
      Remove the line nozzle from the atomizer and remove the foreign object by, for example, blowing out the inside of the Teflon pipe with compressed air. (When removing the line nozzle, take care not to lose the O-ring at its base.)
      The interior of the air nozzle (the cap at the tip) is blocked or warped.
      Please clean the air nozzle interior to remove any foreign objects. When the air nozzle has warped from touching blades or other objects, please replace it with a new one.

  • It runs out of air.

    1. The P-2 O-ring at the base of the line nozzle may be missing.
      Please reattach the P-2 O-ring.

  • The liquid does not stop.

    1. The valve seat is worn.
      Please replace the valve seat.
      A foreign object is caught underneath the valve seat.
      Please remove the foreign object or replace the valve seat.
      The piston valve is not shut completely.
      Please reapply grease to the piston valve’s P-7 O-ring and the atomizer’s P-3 O-ring. After greasing and reassembling the piston valve, move it up and down with your hand. If it does not move easily, there is a high chance that the P-7 O-ring is worn or warped, so please replace it.

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