JUKI DDL8700H Common Problems and Troubleshooting
Welcome to our guide on addressing common problems and troubleshooting for the JUKI DDL8700H sewing machine. Specifically designed for heavy-duty tasks, the JUKI DDL8700H offers enhanced features such as a longer needle bar stroke, heavier feed and foot system, and a higher foot lift. In this article, we will delve into potential issues you might encounter with this model and provide solutions to keep your sewing process smooth.
JUKI DDL8700H Overview
Product Description: The Juki DDL-8700H is an advanced single-needle lockstitch sewing machine suitable for heavy materials. It features an auto-lubrication system, horizontal axis hook and bobbin, and adjustable reverse feed.
The machine includes essential accessories like a thread stand, bobbin winder, oil pan/knee lifter, instruction manual, screwdriver, and machine oil. Notably, this model excels at sewing heavier fabrics like professional curtains, jeans, leathers, and boat canvas.
| Max Sewing Speed | 4,000rpm |
|---|---|
| Max Stitch Length | 5mm |
| Needle Bar Stroke | 25mm |
| Feed Dog | 3-row |
| Lift of the Presser Foot | 5.5 – 13mm |
| Needle | DB×1 (#21) #19～#23 |
| Dimensions | 22 x 10 x 14 inches |
| Item Model Number | DDL8700H |
| ASIN | B07B54LBXM |
| Customer Reviews | 4.1 out of 5 stars (23 ratings) |
| Best Sellers Rank | #112,977 in Arts, Crafts & Sewing #6 in Industrial Machines |
| Discontinued By Manufacturer | No |
| Item Weight | 74.8 pounds |
| Manufacturer | Juki |
| Date First Available | March 1, 2018 |
About this item: The JUKI DDL8700H sewing machine is specifically designed for heavy materials and is perfect for tasks such as sewing professional curtains, jeans, leather, and boat canvas. Its impressive features include a maximum sewing speed of 4,000rpm, a 5mm maximum stitch length, and a needle bar stroke of 25mm.
The feed dog offers a 3-row system, and the presser foot can be lifted between 5.5mm and 13mm. The machine uses a DB×1 (#21) needle size in the range of #19 to #23. The package includes various accessories such as a thread stand, bobbin winder, oil pan/knee lifter, instruction manual, screwdriver, and machine oil. Please note that the table and motor are not included.
Causes of Common Problems with the JUKI DDL8700H
This section will address the potential problems that users may encounter while using the JUKI DDL8700H sewing machine. We will provide solutions and troubleshooting tips to help you maintain optimal performance.
Common Problems and Troubleshooting for JUKI DDL8700H
1. Thread Breakage During Sewing
Description: The sewing machine frequently experiences thread breakage while in operation.
Cause: Thread breakage can be caused by various factors, including improper threading, tension issues, or a damaged needle.
Troubleshooting:
- Re-thread the machine following the correct threading path specified in the user manual.
- Check the tension settings for both the upper and lower threads. Adjust them as needed.
- Inspect the needle for any damage or dullness. Replace the needle if necessary.
2. Uneven Stitches
Description: Stitches are uneven, with some areas appearing tighter or looser than others.
Cause: Uneven stitches can result from incorrect tension settings, improper threading, or a bent needle.
Troubleshooting:
- Check the upper and lower thread tensions. Ensure they are balanced for the fabric you’re using.
- Verify that the machine is properly threaded according to the user manual.
- Examine the needle for any bending or damage. Replace it with a new needle if needed.
3. Skipped Stitches
Description: The machine occasionally skips stitches, resulting in gaps in the fabric.
Cause: Skipped stitches can be caused by a blunt or incorrect needle, improper needle insertion, or lint buildup in the bobbin area.
Troubleshooting:
- Replace the needle with a new one, ensuring it’s the correct type and size for the fabric.
- Insert the needle properly, making sure it’s fully seated and facing the correct direction.
- Clean the bobbin area to remove any lint or debris that might be affecting the stitching.
4. Thread Jamming in Bobbin Area
Description: The thread frequently gets jammed in the bobbin area, causing the machine to stop.
Cause: Thread jamming can occur due to improper bobbin winding, incorrect threading, or a damaged bobbin case.
Troubleshooting:
- Ensure that the bobbin is wound correctly and placed in the bobbin case properly.
- Check the upper thread path to ensure correct threading.
- Inspect the bobbin case for any signs of damage. Replace it if necessary.
5. Fabric Not Feeding Properly
Description: The fabric doesn’t move smoothly, or the feed dogs fail to grip the fabric properly.
Cause: Poor fabric feeding can result from incorrect presser foot pressure, worn-out feed dogs, or irregular fabric movement.
Troubleshooting:
- Adjust the presser foot pressure according to the fabric thickness.
- If the feed dogs are worn, consider replacing them with new ones.
- Ensure the fabric is properly aligned and guided as you sew to prevent irregular feeding.
6. Excessive Noise During Operation
Description: The sewing machine produces loud or unusual noises while in use.
Cause: Excessive noise can be caused by loose components, lack of lubrication, or a worn-out motor.
Troubleshooting:
- Tighten any loose screws, bolts, or components in the machine.
- Ensure proper lubrication of moving parts as per the user manual.
- If noise persists, consider consulting a professional technician for motor inspection or replacement.
7. Bobbin Thread Tangling
Description: The bobbin thread frequently tangles or forms knots during sewing.
Cause: Bobbin thread tangling can occur due to incorrect bobbin winding, improper tension settings, or a dirty bobbin case.
Troubleshooting:
- Re-wind the bobbin ensuring even winding and correct placement in the bobbin case.
- Check and adjust the upper and lower thread tensions to prevent over-tightening.
- Clean the bobbin case area of lint or debris that might be affecting the thread movement.
8. Needle Breaking
Description: Needles frequently break during sewing, causing disruptions in the stitching process.
Cause: Needle breakage can result from using incorrect needle size, sewing through thick layers without proper adjustments, or hitting pins or other hard objects.
Troubleshooting:
- Ensure you’re using the correct needle size and type for the fabric you’re working with.
- Adjust the machine settings and techniques when sewing through multiple layers or heavy fabrics.
- Always remove pins and obstacles from the fabric before sewing to prevent needle damage.
9. Uneven Feed of Fabric
Description: The fabric is fed unevenly through the machine, causing misaligned seams or uneven stitches.
Cause: Uneven fabric feed can result from improper presser foot pressure, uneven fabric tension, or a damaged feed dog.
Troubleshooting:
- Adjust the presser foot pressure according to the fabric thickness and type.
- Ensure the fabric is guided evenly while sewing to prevent uneven tension.
- If the feed dog is damaged or worn, consider replacing it with a new one.
10. Thread Bunching on the Underside
Description: The underside of the fabric shows excessive thread loops or bunching.
Cause: Thread bunching on the underside can be caused by incorrect threading, improper bobbin placement, or incorrect tension settings.
Troubleshooting:
- Double-check that the upper thread is correctly threaded through all thread guides and the needle.
- Ensure the bobbin is placed in the bobbin case with the correct orientation and wound smoothly.
- Adjust the upper and lower thread tensions to balance the stitch formation.
11. Uneven Tension Between Upper and Lower Threads
Description: The tension between the upper and lower threads is visibly uneven, affecting the stitch quality.
Cause: Uneven thread tension can be caused by incorrect tension settings, lint buildup in the tension discs, or threading errors.
Troubleshooting:
- Check and adjust the tension settings for both the upper and lower threads according to the fabric requirements.
- Clean the tension discs and thread path to remove any lint that might be affecting tension control.
- Thoroughly follow the threading path as specified in the user manual.
12. Fabric Puckering
Description: The fabric shows puckering or gathers around the seams after sewing.
Cause: Fabric puckering can result from excessive tension, incorrect presser foot pressure, or using the wrong needle size.
Troubleshooting:
- Adjust the tension settings to ensure a balanced tension between the upper and lower threads.
- Check and adjust the presser foot pressure according to the fabric type and thickness.
- Use the appropriate needle size and type for the fabric to prevent excessive fabric distortion.
13. Inconsistent Stitch Length
Description: The machine produces stitches with varying lengths, leading to an inconsistent appearance.
Cause: Inconsistent stitch length can be caused by incorrect stitch length settings, uneven fabric feeding, or mechanical issues.
Troubleshooting:
- Adjust the stitch length settings on the machine to achieve the desired consistency.
- Ensure the fabric is guided evenly through the machine to prevent variations in stitch length.
- If the problem persists, consult a professional technician for a mechanical inspection.
14. Needle Threader Malfunction
Description: The needle threader fails to work properly, making threading the needle difficult.
Cause: Needle threader issues can arise from misalignment, damage, or improper usage.
Troubleshooting:
- Ensure the needle is in the correct position for the threader to function.
- Gently insert the needle into the threader while following the manufacturer’s instructions.
- If the threader continues to malfunction, consider threading the needle manually.
15. Fabric Jams in the Feed Dogs
Description: The fabric gets stuck or jammed in the feed dogs, preventing smooth sewing.
Cause: Fabric jams can occur due to improper fabric alignment, worn-out feed dogs, or debris in the feed dog area.
Troubleshooting:
- Ensure the fabric is aligned properly and guided evenly through the machine while sewing.
- If the feed dogs are worn, consider replacing them with new ones.
- Clean the feed dog area to remove any lint, threads, or debris that might be causing the jam.
16. Skipped Stitches on Thick Fabrics
Description: The machine consistently skips stitches when sewing through thicker fabrics.
Cause: Skipped stitches on thick fabrics can result from using the wrong needle type or size, inadequate presser foot pressure, or improper threading.
Troubleshooting:
- Use the appropriate needle size and type for heavy fabrics to prevent skipped stitches.
- Adjust the presser foot pressure to ensure proper fabric feeding on thicker materials.
- Double-check the threading path to ensure the thread is correctly guided through the machine.
17. Thread Fraying or Breaking
Description: The thread frequently frays or breaks during sewing, disrupting the stitching process.
Cause: Thread fraying or breaking can occur due to poor thread quality, incorrect tension settings, or burrs on the needle plate.
Troubleshooting:
- Use high-quality thread suitable for the fabric being sewn to minimize fraying and breakage.
- Adjust the tension settings for both upper and lower threads to achieve balanced tension.
- Inspect the needle plate for any burrs or rough spots. Smooth any irregularities with fine sandpaper or a file.
18. Stuck Bobbin Winder
Description: The bobbin winder is stuck and doesn’t wind the bobbin properly.
Cause: A stuck bobbin winder can result from incorrect positioning, tangled thread, or debris in the winder mechanism.
Troubleshooting:
- Ensure the bobbin winder spindle is properly engaged with the winder mechanism.
- Check for any tangled thread that might be causing the winder to jam.
- Clean the bobbin winder area to remove any debris or lint that could be hindering its movement.
19. Fabric Not Advancing During Reverse Stitching
Description: The fabric doesn’t advance properly when reverse stitching, leading to uneven stitches.
Cause: Poor fabric advancement during reverse stitching can result from sticky feed dogs, improper stitch length settings, or incorrect technique.
Troubleshooting:
- Clean the feed dogs to ensure smooth fabric movement during reverse stitching.
- Adjust the stitch length settings if they are too long, which might affect the fabric feed during reversing.
- Practice a controlled reverse stitching technique to avoid abrupt movements that could affect fabric advancement.
20. Inconsistent Bobbin Tension
Description: The tension of the bobbin thread is inconsistent, affecting the overall stitch quality.
Cause: Inconsistent bobbin tension can be caused by incorrect bobbin winding, debris in the bobbin case, or incorrect insertion.
Troubleshooting:
- Ensure the bobbin is wound evenly and correctly following the machine’s instructions.
- Clean the bobbin case area to remove any lint or debris that might be affecting tension.
- Insert the bobbin correctly into the bobbin case, ensuring the thread is properly guided through the tension spring.
21. Excessive Vibrations During Operation
Description: The sewing machine produces excessive vibrations or shaking while in use.
Cause: Excessive vibrations can result from an uneven surface, imbalanced motor, or loose components.
Troubleshooting:
- Place the sewing machine on a stable and even surface to minimize vibrations.
- Check for any loose screws, bolts, or components and tighten them securely.
- If vibrations persist, consider consulting a professional technician for motor or component inspection.
22. Fabric Slippage During Sewing
Description: The fabric slips or shifts during sewing, leading to misaligned stitches.
Cause: Fabric slippage can occur due to inadequate presser foot pressure, improper fabric feeding, or uneven tension.
Troubleshooting:
- Adjust the presser foot pressure to ensure proper fabric grip while sewing.
- Guide the fabric evenly through the machine to prevent shifting or misalignment.
- Check and adjust the thread tension to maintain consistent stitching without pulling or stretching the fabric.
23. Motor Overheating
Description: The sewing machine’s motor becomes excessively hot during prolonged use.
Cause: Motor overheating can result from continuous use without breaks, insufficient lubrication, or a malfunctioning motor.
Troubleshooting:
- Allow the motor to cool down by turning off the machine and giving it a rest.
- Ensure proper lubrication of moving parts as recommended in the user manual.
- If the motor continues to overheat, consult a professional technician for inspection and repair.
24. Incorrect Needle Position
Description: The needle position is not aligned correctly with the fabric, leading to uneven stitching.
Cause: Incorrect needle position can result from a bent needle, misalignment of needle bar, or improper needle insertion.
Troubleshooting:
- Replace the needle with a new one if it’s bent or damaged.
- Check the needle bar alignment and adjust it if necessary according to the user manual.
- Ensure the needle is inserted correctly and securely, following the machine’s instructions.
25. Limited Stitch Options
Description: The sewing machine is unable to execute certain stitch patterns or options.
Cause: Limited stitch options can result from incorrect settings, mechanical issues, or a lack of compatible accessories.
Troubleshooting:
- Review the user manual to understand the machine’s stitch options and settings.
- Perform a thorough cleaning of the machine to ensure smooth mechanical operation.
- If specific stitches are still unavailable, consider consulting the manufacturer or a professional technician for guidance.
JUKI DDL8700H Sewing Machine User Reviews
Customer reviews provide valuable insights into the experiences of users with the JUKI DDL8700H sewing machine. These reviews help prospective buyers understand both the positive and negative aspects of the product. The following sections summarize user feedback from online reviews without including feedback related to shipping, warranty, and customer service.
Positive Reviews from JUKI DDL8700H Sewing Machine Users
- Many users were satisfied with the machine’s versatility, mentioning that it can handle a variety of fabrics including denim, leather, and marine vinyl.
- Several users appreciated the machine’s speed and stitch quality, highlighting the beauty of the stitches it produces.
- Users running businesses found the JUKI DDL8700H to be an ideal choice for their sewing needs due to its reliability and efficiency.
- Positive feedback also emphasized the inclusion of a quiet servo motor option, making the machine suitable for both professional use and home settings.
- Users expressed satisfaction with the overall value for money, praising the machine’s performance for its price.
These positive experiences demonstrate the JUKI DDL8700H’s capabilities in meeting various sewing demands and delivering high-quality results.
Negative User Reviews of the JUKI DDL8700H Sewing Machine
- Some users reported difficulty in handling the machine’s reverse stitching feature, mentioning challenges in threading and adjusting the stitch length.
- Several users encountered issues with tension adjustments, leading to inconsistent stitch quality and thread breakage.
- Occasional mentions were made about receiving machines with signs of previous use or inadequate packaging, causing concerns about the machine’s condition.
- Minor concerns included confusion about the placement of controls such as the presser foot handle and tension dial, leading to initial usability challenges.
These negative experiences highlight areas where users faced difficulties in using the JUKI DDL8700H, which might require adjustments or additional guidance.
Overall, the majority of users expressed satisfaction with the JUKI DDL8700H sewing machine’s performance, citing its versatility, stitch quality, and value for money. However, a subset of users encountered challenges related to machine operation and initial condition. As with any product, it’s important to consider both positive and negative feedback to make an informed purchasing decision.
JUKI DDL8700H Sewing Machine Manual
The operating instructions for the JUKI DDL8700H sewing machine can be found on the manufacturer’s official website. It’s recommended to refer to the official manual to understand the machine’s features, settings, and proper usage. The manual provides valuable guidance on setup, maintenance, and troubleshooting to ensure optimal performance and longevity of the machine.
JUKI DDL8700H Frequently Asked Questions
1. How do I adjust the tension for different fabrics?
To adjust thread tension, refer to the machine’s manual for guidelines on balancing upper and lower thread tensions based on the fabric you’re using. Test on scrap fabric before starting your project.
2. Why does the thread keep breaking?
Thread breakage can be due to incorrect tension settings, using a dull or incorrect needle, or a burr on the needle plate. Check and adjust tension, use a suitable needle, and ensure the needle plate is smooth.
3. How can I prevent skipped stitches?
Skipped stitches can result from incorrect needle size, improper needle-bar height, or using incorrect thread. Ensure proper needle size, adjust needle-bar height, and use high-quality thread.
4. Why is the machine making loud noises?
Loud noises can be due to loose components, lack of lubrication, or a worn-out motor. Tighten any loose parts, lubricate as per the manual, and consider professional inspection if noise persists.
5. How can I prevent fabric puckering?
Fabric puckering can occur due to improper tension settings or incorrect presser foot pressure. Adjust tension, ensure even fabric feeding, and use appropriate presser foot pressure for the fabric.
Conclusion
When encountering problems with your JUKI DDL8700H sewing machine, it’s recommended to refer to the manual, contact customer service, or visit a service center for assistance. The manual provides detailed information on machine operation, troubleshooting, and maintenance. If issues persist, seeking professional guidance ensures a reliable and efficient resolution to any problems you may encounter.
