Upper Shaft Coupling for Juki 14817 Flat Bed Sewing Machine Parts

Product Overview

The upper shaft coupling is a mechanical transmission component designed for compatible Juki 14817 flat bed industrial sewing machines.

It is installed in the upper shaft drive system and connects the related rotating components. The coupling transfers rotational power while helping the upper shaft mechanism maintain stable and synchronized movement during machine operation.

A worn, loose or damaged coupling may cause abnormal noise, excessive clearance, unstable shaft rotation or inconsistent machine performance.

Replacing the damaged component with a correctly matched coupling helps restore reliable power transmission and normal machine operation.

Before ordering, please provide the machine model, old coupling photos and available dimensions so that compatibility can be confirmed.

Product Information

The exact part number, bore diameter, outside diameter and mounting structure should be confirmed according to the original component.

Product Function

The upper shaft is an important transmission component inside an industrial sewing machine.

During operation, the motor and internal drive mechanism provide rotational power to the upper shaft. The upper shaft then coordinates the movement of related sewing components.

The coupling connects the corresponding shaft or drive components and transfers rotational force between them.

A correctly fitted coupling helps maintain stable rotation, accurate mechanical timing and repeatable machine movement.

If the coupling becomes worn, cracked, loose or deformed, the connection may develop excessive clearance. This can result in unstable rotation, mechanical noise, vibration or inaccurate movement of the sewing mechanism.

Main Advantages

• Stable Power Transmission

  The coupling helps transfer rotational power between the connected shaft components during continuous machine operation.

• Metal Construction

  The metal structure provides mechanical strength for industrial sewing machine transmission applications.

• Compact Mechanical Design

  The compact structure is suitable for installation inside the upper shaft drive system.

• Accurate Installation Support

  Correct dimensions and mounting positions help the coupling fit securely with the related machine components.

• Reliable Replacement Solution

  Suitable for replacing couplings that are worn, damaged, loose, cracked or mechanically deformed.

• Supports Stable Machine Movement

  A correctly matched coupling helps maintain stable upper shaft rotation and coordinated mechanical movement.

• Inspection Before Shipment

  The product appearance, bore, mounting holes, surface condition, quantity and packing are checked before dispatch.

• Protective Export Packing

  The coupling is packed carefully to reduce the risk of impact, moisture, deformation and surface damage during international transportation.

Common Replacement Situations

• The coupling becomes loose during operation
• The coupling surface is visibly worn
• The mounting holes are damaged
• The internal bore becomes enlarged
• The coupling is cracked or deformed
• The upper shaft produces abnormal noise
• The upper shaft rotation becomes unstable
• The machine produces unusual vibration
• The sewing movement becomes inconsistent
• The original coupling is missing or damaged

Replacing a worn coupling before complete failure can help reduce additional wear on the shaft and nearby transmission components.

Possible Symptoms of a Worn Coupling

• Abnormal mechanical noise
• Increased shaft clearance
• Unstable upper shaft rotation
• Repeated loosening of the connection
• Machine vibration during operation
• Inconsistent sewing movement
• Incorrect mechanical timing
• Reduced production stability
• Visible coupling wear or deformation

These symptoms may also be related to the shaft, bearings, gears, fasteners, motor or other transmission components. The complete drive system should be inspected before replacing the coupling.

Compatibility Confirmation

Upper shaft couplings may have similar appearances but different outside diameters, bore sizes, widths, mounting holes and locking structures.

Please do not confirm compatibility only according to the product photo.

For accurate checking, please provide the following information.

• Complete Machine Model
• Machine Serial Number
• Original Part Number
• Required Quantity
• Photos of the Old Coupling
• Photos of Both Sides
• Photos of the Installation Position
• Outside Diameter
• Inside Diameter
• Product Width
• Mounting Hole Dimensions
• Shaft Connection Structure
• Delivery Country
• City and Postal Code

If the original part number is unavailable, place the old coupling beside a ruler and provide clear photos showing its main dimensions.

Quality Inspection

Each order is checked according to the confirmed product information before shipment.

The inspection includes the product appearance, outside diameter, bore diameter, width, mounting holes, visible deformation, quantity and packaging.

Products with visible cracks, damaged holes, serious corrosion or abnormal deformation will not be selected for shipment.

For larger orders, product photos, inspection photos and packing photos can be provided before dispatch.

Why Choose Us

• Professional Spare Parts Supplier

  We supply spare parts and consumables for automatic cutters, fabric spreaders and industrial sewing equipment.

• Accurate Product Checking

  Customers can provide machine models, part numbers, old product photos and dimensions for compatibility confirmation.

• Wide Product Range

  We supply shaft couplings, bearings, gears, belts, motors, sensors, cutter blades, sharpening parts and other textile machinery components.

• Inspection Before Shipment

  Products are checked according to the confirmed specifications and order information before dispatch.

• Flexible Order Support

  We support individual maintenance orders, urgent replacement requirements and regular bulk purchasing.

• One Stop Purchasing

  Different sewing machine parts, spreader parts and cutter parts can be quoted, packed and shipped together.

• Worldwide Delivery

  We regularly arrange shipments to Bangladesh, Indonesia, Brazil, the Philippines, the United States, Egypt and European countries.

Frequently Asked Questions

What is the product name

The product name is upper shaft coupling.

Which machine is it suitable for

It is supplied for compatible Juki 14817 flat bed industrial sewing machines.

What is the function of the coupling

It connects the related upper shaft transmission components and transfers rotational power during machine operation.

What material is used

The product is manufactured from metal.

Can I order according to the product photo

The photo can be used as a reference, but the machine model, part number, bore diameter, outside diameter and mounting structure should also be confirmed.

Can a worn coupling cause abnormal noise

Yes. A loose, worn or damaged coupling may cause excessive clearance, unstable rotation, vibration or mechanical noise.

Can you provide product photos before shipment

Yes. Product photos, dimension photos, inspection photos and packing photos can be provided before dispatch.

Can I purchase one piece

Please provide the required quantity for price and availability confirmation. Individual maintenance orders can be supported.

Do you supply other Juki machine parts

Yes. Please send the machine model, product numbers, old part photos or complete spare parts list for checking.

Can it be shipped with cutter parts

Yes. Sewing machine parts, spreader machine parts and cutter parts can be combined into one shipment to simplify purchasing and reduce international transportation costs.