K60 Series White Ink Circulation Pump Replacement Guide

Applicable Model: LINKO K60 Series DTF Printers

This guide explains how to replace the white ink circulation pump safely and correctly.
Please follow the steps in order to avoid ink backflow, component damage, or improper operation.

1. Scope of Operation & Components Involved

During this circulation pump replacement, you will need to operate the following components:
① Circulation pump power cable
② Circulation pump signal cable
③ White ink circulation pump (pump body)
④ White ink peristaltic tubes

Circulation pump speed control potentiometer(See Figure 1-2)
Printhead maintenance station base(See Figure 1-3)

Note:
All component names, cable numbers, and direction references mentioned in the following steps are based on the images in this section.

2. Safety Preparation & Protection

(No hardware disassembly in this section)

2.1 Press the emergency stop button to stop the Printer. (See Figure 2.1)

2.2 Turn off the main power and unplug the power cable. (See Figure 2.2-1)
⚠ Warning:
Operating without power-off may cause permanent pump damage or electric shock.

2.3 Clamp the White Ink Tube (Prevent Ink Backflow)
Before removing the circulation pump, clamp the white ink circulation tube to prevent ink backflow or leakage. (See Figure 2.3-1)
Explanation: If white ink flows back into the pump, it may enter the motor and cause permanent damage.

2.4 Record the Original Condition (Strongly Recommended)
Use your phone to take clear photos of the following areas for reference during reinstallation:

Overall ink supply system layout
Original position of the pump speed control potentiometer

3. Open the Working Area

(Expose the circulation pump)

3.1 Remove the Printhead Maintenance Station Base
Remove the four fixing screws and carefully take off the maintenance station base.
(See Figures 3.1-2 / 3.1-3)

4. Disconnect Circulation Pump Cables & Control Components

4.1 Identify Circulation Pump Cable Interfaces
The circulation pump has two cable connections:(See Figure 3.1)

NO.	Interface	Description	Cable Type
①	Power Input	DC 24V power input	Power Cable
②	Circulation Pump Motor	Start/stop control & status detection	Signal Cable

4.2 Remove the Circulation Pump Power Cable (①)
Unplug the power connector from the pump, then unplug the other end and remove the power cable completely.

4.3 Remove the Pump Speed Control Potentiometer
Loosen the two fixing screws and remove the potentiometer as a whole.
(See Figures 4.3-1 to 4.3-3)

4.4 Remove the Circulation Pump Signal Cable (②)
Follow the steps below:

Loosen the knob fixing screw and remove the knob
Loosen the signal cable fixing screw
Separate the signal cable from the housing and remove it
(See Figures 4.4-1 to 4.4-5)

5. Remove the Old Circulation Pump

(Disconnect ink tubes and remove the pump body)

5.1 Disconnect the White Ink Peristaltic Tubes
Remove the two peristaltic tubes connected to the pump.
Wrap the tube ends with a lint-free cloth and secure them with cable ties to prevent ink leakage.
(See Figures 5.1-2 / 5.1-3)

5.2 Remove the Old Circulation Pump
Loosen the fixing screws and remove the circulation pump. (See Figures 5.2-1 / 5.2-2)

6. Install the new circulation pump and reconnect the connections

6.1 Fix the New Circulation Pump
Align the pump with the mounting holes, place it gently into position, and tighten the fixing screws. (See Figure 5.2-1)

6.2 Reconnect the White Ink Peristaltic Tubes. (See Figures 5.1-2 / 5.1-3)
⚠ Important: The circulation pump has a flow direction. (See Figure 6.2)

IN → Connect to the white ink return tube
OUT → Connect to the main white ink circulation tube

A reversed connection will cause abnormal circulation.

6.3 Connect the Circulation Pump Power Cable (①)
Connect the power cable to the pump, then route the other end through the cable hole into the machine. (See Figure 6.3-2/6.3-3)
Note:
The power cable is usually a 2-pin connector. (See Figure 6.3-1)

6.4 Install and Connect the Signal Cable (②)
Align the signal cable with the mounting position and tighten the fixing screw. (See Figure 4.4-4/4.4-3)
Note: The signal cable is usually a 3-pin connector. (See Figure 6.4)

6.5 Install the Speed Control Knob and Set to Zero
Install the speed control knob, tighten the fixing screw. (See Figures 4.4-2 / 4.4-1)
Set the knob to 0 before powering on. (See Figure 6.5)
⚠ Purpose:
To prevent the pump from starting at high speed when powered on, which may damage the pump or the ink system.

6.6 Install the Speed Control Potentiometer
Route the signal cable through the cable hole into the machine.（See Figure 6.6）

Align the potentiometer with the mounting holes, place it gently into position, and tighten the two fixing screws.（See Figure 4.3-3/4.3-2/ 4.3-1）

6.7 Restore Cables and Structure
Refer to Figure 4.1 and reconnect cables ① and ②
Reinstall the printhead maintenance station base and tighten the four fixing screws
(See Figures 3.1-3 / 3.1-2)

7. Power-On Inspection & Functional Test

7.1 Release the white ink circulation tube clamp. (See Figure 2.3-2)
7.2 Plug in the power cable and turn on the main power switch. (See Figure 2.2-2)
7.3 Release the emergency stop switch: rotate the emergency stop button clockwise to restore the machine power circuit. (See Figure 7.3)

7.4 Functional Test
After power is restored, observe the circulation pump operation for at least 10 seconds.

✅ Normal condition:

Pump runs smoothly
No abnormal noise

❌ Abnormal condition:

Pump does not run
Unstable speed
Sharp or unusual noise

If any abnormal condition occurs, power off immediately and contact LINKO technical support.

Technical Support
Email: support@dtflinko.com
Website: www.dtflinko.com