VJ-626UF-B-69 - Coupling flexible

Flexible coupling – Mutoh ValueJet 626UF – part number B-69

The flexible coupling, part number B-69, is a drive component for the Z-axis (table lift) of the Mutoh ValueJet 626UF flatbed UV printer. Fitted to the Z Motor Assy DG-48124, it connects the Z-axis motor shaft to the drive screw that controls the table’s vertical movement.

This type of coupling transmits motor torque whilst compensating for slight misalignments (angular, parallel, axial) between the motor shaft and the lead screw. It absorbs vibrations and jolts during start-up and shutdown. This controlled flexibility ensures precise and smooth vertical movement of the table, which is essential for adjusting the distance between the print head and the media.

This is a genuine Mutoh (OEM) part, integrated into the Z Motor Assy DG-48124 and not listed separately by the manufacturer. DG Spare Parts supplies it individually as a spare part, ready to fit onto the existing Z-axis drive assembly.

Technical specifications

• DG Spare Parts part number: VJ-626UF-B-69 (part number B-69)
• Original assembly: component of the Mutoh DG-48124 Z Motor Assy
• Manufacturer: Mutoh (original OEM part)
• Part type: flexible coupling (coupling / shaft coupling)
• Axis / Area concerned: Z – vertical table movement
• Associated motor: Z-axis motor (DG-48124 assembly)
• Function: connection between Z-axis motor shaft and drive screw
• Delivery: single part, ready for fitting
• Application: flatbed UV LED printer, automatic table lift system

Compatibility and use

• Mutoh ValueJet 626UF (VJ-626UF)
• Component of the Z Motor Assy DG-48124 – Z-axis drive (automatic table lift, printing of objects up to 150 mm thick)

Function

• Transmits torque from the Z-axis motor to the drive screw
• Compensates for misalignment between the motor shaft and the lead screw
• Absorbs vibrations and jolts during start-up and shutdown
• Ensures precise and smooth vertical movement of the table

Possible symptoms of wear

• Play or jerky movement in the table’s vertical travel
• Abnormal noise (clattering, squeaking) during Z-axis movements
• Inaccurate table height, incorrect head-to-support distance
• Print defects (sharpness, banding) caused by an unstable Z-axis adjustment
• Loss of pitch or jamming of the lift mechanism in the event of a broken coupling

Replacing the flexible coupling restores play-free power transmission on the Z-axis and ensures reliable vertical positioning of the table, which is essential for consistent print quality on media of varying thicknesses.

♻️ DG Spare Parts – European specialist in spare parts for large-format printers and plotters.