Pump Motor & Yellow Tube Replacement Video _ Printer Cleaning Issues Part 4 ARTJET 2026

Pump Motor & Yellow Tube Replacement Video _ Printer Cleaning Issues Part 4 ARTJET 2026

 

So far, I have summarized the information related to UV Printers below. If you click on the article, you will be taken to the link for related information.

9 articles on head basics,
12 articles on actual head issues and their solutions,
10 actual mechanical Machine Problems and Solutions.
12 Problems and Solutions of Electronic Boards and SW Actually Issued
11 Problems and Solutions: Sai Rip Installation and Basic Settings, Spot Color Creation, and More
We’ve compiled a list of products that can be made with a UV printer.

 

I. Background information

We’re updating previous content.

The full text of Part 24 of the Ink Supply Issues series can be found through the link below.

24 articles on ink supply issues,

This article discusses pump motor, highlighted in red in the full table of contents for ink supply issues.

 

II. Pump motor location

 

When ink flows from the main ink bottle through the ink tube to the damper, it flows through the print head to the captop, then through the motor pump to the waste ink tank.

• The first session covered the captop lower tube,
• The second session covered how to replace the captop,
• And the third session covered the damper.

You can find more information by clicking the relevant link.

The names of each part can be found in the photos below.

 

In this session, I will explain the operating principle of the NO.3 Pump Tube & motor in the photo above and what role it plays in ink supply.

III. Inkjet printer head cleaning method

1. Pneumatic method

This method is primarily used in large-format inkjet printers.

From the Main Ink Tank to the Auxiliary Ink Tank

• In large-format inkjets, when ink is refilled in the main ink tank, it is stored in the auxiliary ink tank before reaching the print head.
• The auxiliary ink tank regulates the ink flow to ensure stable jetting of ink from the print head.
• Depending on the printer size, a 5-7 meter ink tube connects the main ink tank to the auxiliary ink tank.
• A relatively powerful pump motor is used to transport ink from the main ink tank to the auxiliary ink tank through the 5-7 meter ink tube.
• When the auxiliary ink tank is full, the pump motor, which rotates next to the main ink tank, stops.
• If the auxiliary ink tank is not sufficiently supplied due to a print job, the pump motor restarts to refill the auxiliary ink tank.
• In this way, ink is supplied from the main ink tank to the auxiliary ink tank by the pump motor.

 

From the auxiliary ink tank to the print head and cleaning

• However, the ink supply from the auxiliary ink tank to the print head nozzle uses a different method.
• It’s controlled by positive air pressure, negative air pressure, and convection pressure.
• Since this section describes head cleaning, I’ll focus on this part.
• Breaking the vacuum that holds the ink in the auxiliary ink tanks from flowing downward, briefly injecting air into the vacuum causes the ink to flow out through the print head.
• The button that briefly injects air is called a purge.
• Press the purge button to inject air for 2-3 seconds, then reestablish the vacuum.
• Ink flows out through the print head for 2-3 seconds.
• After the ink flows out, the head surface is wiped with a cloth, completing the head cleaning process.

 

2. Convection method and damper

This method is used in compact printers, and is the same as that used in standard desktop printers.

Ink is supplied in compact printers under the following principles:

• Ink tubes originating from the main ink tank are connected to dampers, and dampers are inserted into the connection points of each print head channel.
• To pump ink from the main ink tank to the final waste ink tank,
• the captop rises and seals against the bottom of the print head, creating a vacuum to prevent air from entering.
• In this state, when the pump motor rotates, the three rotating cylinders within the motor pump press against the yellow tube (peristaltic pump tube) and rotate.
• This physical force causes the ink contained in the damper to flow through the print head, into the captop, and then flow through the yellow tube to the waste ink tank.
• This principle drives the ink load (pump), and when the print head is wiped with a wiper, the print head is cleaned.

 

The ink control method utilizes convection and damper technology.

• From the main ink tank to the print head, a pump motor fills all the lines with ink.
• The damper retains the ink and maintains the ink jetting state from the print head.
• The auxiliary ink tanks in large format printers can be thought of as dampers in small printers.
• This method utilizes convection pressure, which directs ink from a higher to a lower location, and damper technology, proven in desktop applications for many years, to ensure stable ink control.

 

If, for various reasons, the pump motor fails to draw ink,

• printers using this method will not be able to properly print because the head cleaning process will not be completed.
• Printers using a damper must pump,
• and because this is such a crucial issue, we are explaining the captop, damper, and pump motor involved in ink supply in a series.

IV. Pump motor operating principles and problem summary

1. How it works

As the motor turns and turns the central gear, the three cylinders rotate independently, each turning in one direction.

When the peristaltic pump tube (yellow tube) touches the rotating cylinders, the cylinders, which were previously stationary, begin to rotate as a whole, pressing against the peristaltic pump tube (yellow tube).

This pressure causes the ink to flow in one direction.

This principle allows the ink in the main ink tank to flow to the waste ink tank.

2. Problems that occurred with the pump motor

 

If the inside of the motor pump cap is clean and the motor is running smoothly, but the cylinder isn’t turning,

• the yellow tube may be completely compressed.
• The three cylinders need contact to turn in one direction.
• If the yellow tube is excessively compressed, there will be no pressure, and the cylinder won’t turn.
• It’s recommended to replace the yellow tube every three months.
• If it’s functioning properly, cleaning won’t be as effective as when the unit was new.

 

If the three cylinders rotate but the pump doesn’t start,

• This also means the yellow tube is compressed and will rotate to the cylinders, but light pressure may not transfer ink.
• Alternatively, the yellow tube inside the cap may be slightly torn.

 

If you replace the yellow tube with a new one and only hear a humming sound and the cylinders don’t rotate,

• When you first replace the yellow tube, it’s not compressed yet, so it’s tight.
• After replacing the new tube, gently twist the cap to open and close it, and it should start spinning.

 

If air enters the captop, the lower tube, or the damper connection, ink loading (pumping) may not occur even if the pump motor is functioning properly.

You can watch a video on how to replace the motor pump tube (Peristaltic pump tube or simply the yellow tube) by clicking here or hereunder picture.

 

V. ARTJET UV Printer

One thing I’ve noticed after five years of sales and maintenance of ARTJET UV printers is that troubleshooting data is second only to product stability.

All products have issues, whether they’re caused by actual equipment problems or consumer error. Product stability hinges on how quickly and easily you can resolve those issues.

ARTJET compiles all troubleshooting data.

You can see the product print quality by clicking here. 

Click here for ARTJET pricing and terms of sale. The exterior design has changed.