Product Description
400-10573 Needle Bar for Juki Computerized Bartacking Machines
Best For
This 400-10573 Needle Bar is a precision replacement component for computerized bartacking and button-sewing machines in the LK-1900/LK-1903 series. It is designed as a direct replacement for the original needle bar assembly, helping maintain accurate needle movement and consistent sewing performance in busy garment-production environments.
Key Features
- Direct replacement design for compatible computerized bartacking machines.
- Part number 400-10573 for easier spare-part identification.
- Precision-machined construction supports accurate vertical needle movement.
- Chrome-plated finish provides a smooth working surface for reduced friction within the needle-bar bushing.
- Case-hardened steel construction is suited to repeated reciprocating movement during industrial sewing.
- Accurate mounting and alignment helps maintain correct needle-bar positioning after replacement.
- Precision-ground balance supports stable operation during repeated high-speed sewing cycles.
- Pack of 1 piece, suitable for individual machine repair or spare-parts stock.
Use Cases
This needle bar is used where the original needle bar has become worn, damaged, bent, or otherwise unsuitable for reliable operation. It is particularly useful for:
- Garment factory bartacking machines
- Belt-loop attachment
- Workwear production
- Trouser and jacket manufacturing
- Shirt production
- Industrial button sewing applications
- Computerized bartacking machine maintenance
- Replacement-part inventory for sewing-machine technicians
The needle bar is part of the machine’s main shaft and needle-bar mechanism. Parts documentation for the LK-1900 family shows the needle bar together with related needle-bar bushes, connecting components, crank parts, and thread-guide components.
Benefits
Maintains Precise Needle Movement
A correctly fitted needle bar keeps the needle assembly moving vertically along the intended path. This is important because needle-bar position is directly related to needle-to-shuttle timing and stitch formation.
Supports Consistent Bartacking
A properly aligned replacement needle bar helps the machine maintain consistent needle positioning during repeated programmed bartacking cycles.
Suitable for Continuous Industrial Use
The case-hardened steel construction is intended for repeated reciprocating movement, making this replacement suitable for garment-production environments where bartacking machines operate frequently.
Smooth Working Surface
The specified chrome-plated finish provides a smooth surface around the needle-bar working area, supporting controlled movement through the needle-bar bushings.
Easy Spare-Part Identification
The 400-10573 part number makes it easier for technicians and purchasing teams to identify the required replacement rather than relying only on the machine’s visual appearance.
Machine Compatibility
Compatible machine family: Juki LK-1900/LK-1903 computerized bartacking and button-sewing machines, including LK-1900, LK-1900A, LK-1900B, LK-1900BN, LK-1903, LK-1903A, LK-1903B and LK-1903BN, subject to the exact machine revision and parts configuration.
The Juki LK-1900A parts documentation specifically lists 400-10573 as NEEDLE BAR, and a current LK-1903 parts listing identifies the same part as B1401-L7A-VOO / 400-10573.
Additional compatibility claimed for this listing: Jack JK-T1900 / JK-T1903, Zoje, Singer and standard 1900/1903-series computerized bartackers. Verify the existing part number and physical dimensions before ordering for non-Juki machines.
Specifications
| Specification | Details |
|---|---|
| Product Type | Needle Bar |
| Part Number | 400-10573 / 40010573 |
| Alternate Reference | B1401-L7A-VOO |
| Machine Type | Computerized Bartacking / Button Sewing |
| Compatible Series | LK-1900 / LK-1903 |
| Primary Brand | Juki |
| Construction | Case-Hardened Steel Alloy |
| Surface | Chrome-Plated Finish |
| Application | Industrial Garment Sewing |
| Pack Quantity | 1 Piece |
| Fabric Application | Universal Garment Textiles |
How To Use
First, switch off the sewing machine and disconnect the power before beginning mechanical work.
Next, remove the necessary covers and components to access the needle-bar assembly, following the machine’s service procedure.
Then, remove the existing needle bar and install the replacement in the original needle-bar mechanism, ensuring that the connecting screw, clamp and associated bushings are correctly positioned.
Finally, manually rotate the machine through a complete needle movement and verify needle-bar height, needle-to-shuttle relationship and clearance before operating the machine at production speed.
The Juki instruction material specifically requires power to be switched off during needle-bar adjustment and provides a defined needle-bar height adjustment procedure. It also notes that needle-bar position affects needle-to-shuttle relation.
FAQs
Is 400-10573 the needle bar for Juki LK-1903?
Yes. 400-10573 is identified as a needle bar for the Juki LK-1900/LK-1903 family. Parts listings cross-reference 400-10573 with the LK-1903 and identify the alternate reference B1401-L7A-VOO. Always compare the part number on your existing component before ordering.
What machines use the 400-10573 needle bar?
The listed application covers Juki LK-1900 and LK-1903 series computerized bartacking machines, including several A, B and BN variants. Other 1900/1903-series machines may use different revisions, so the existing part number should be checked before replacement.
What happens if a bartack machine needle bar is worn or damaged?
A damaged or incorrectly positioned needle bar can affect needle movement, needle height and the relationship between the needle and shuttle. These adjustments are important for reliable stitch formation, and the Juki service instructions include dedicated procedures for needle-bar height and needle-to-shuttle adjustment.
Does replacing the needle bar automatically restore machine timing?
No. After replacing the needle bar, its position must be correctly adjusted and the needle-to-shuttle relationship checked. The replacement part itself does not automatically set machine timing. Juki service instructions specifically describe needle-bar height and needle-to-shuttle adjustment procedures.
Can I install this needle bar without checking the bushings?
The bushings should be inspected during replacement. The LK-1900 parts breakdown shows the needle bar working together with multiple needle-bar bushing components, so excessive bushing wear can affect the movement of a new needle bar as well.
Is this needle bar suitable for continuous factory use?
Yes. Its stated case-hardened steel construction and precision-machined design make it suitable for repeated reciprocating operation in industrial garment production. Correct machine adjustment and compatible bushings remain important for reliable long-term operation.
