JUKI DDL-8700 Industrial Straight Stitch Sewing Machine User Manual

1. Introduction

This manual provides essential information for the safe and efficient operation, setup, and maintenance of your JUKI DDL-8700 Industrial Straight Stitch Sewing Machine. Please read this manual thoroughly before using the machine to ensure proper function and longevity. This machine is designed for sewing light to medium-weight fabrics and is not intended for heavy materials like leather.

2. Safety Instructions

• Always disconnect the power supply before cleaning, servicing, or making adjustments to the machine.
• Keep fingers away from the needle area and moving parts during operation.
• Do not operate the machine with damaged cords or plugs.
• Ensure the machine is placed on a stable, level surface.
• Keep children and pets away from the machine during operation.
• Use only recommended needles and accessories for this machine.

3. Package Contents

Verify that all components listed below are present in your package:

• JUKI DDL-8700 Machine Head
• Sewing Machine Table and Stand (partially assembled)
• Electronic DC Servo Motor (3/4 H.P, 1 PHASE, 110 VOLT)
• Task Chair (Low-Back with 360-Degree Swivel Casters)
• Bobbin Winder
• Thread Stand
• Machine Oil
• Knee Lifter
• V-Belt
• 5 Extra Bobbins
• 10 Extra Needles
• Instruction Manual (this document)
• Screwdriver
• Oil Pan
• LED Lamp (may require separate attachment)

Figure 3.1: Assorted accessories and parts for the JUKI DDL-8700.

4. Setup

4.1 Machine and Stand Assembly

The machine stand is shipped pre-assembled. The machine head is packaged separately. Carefully place the machine head onto the designated area of the table. Secure it according to the instructions provided in the separate assembly guide for the table and head. Attach the LED lamp and thread rack as needed.

Figure 4.1: Fully assembled JUKI DDL-8700 setup.

4.2 Oiling the Machine

Locate the oil pan beneath the machine head. Fill the oil pan with the included machine oil. Ensure the oil level is within the recommended range. Regular oiling is crucial for the machine's performance and longevity.

4.3 Connecting the Motor

The electronic DC Servo Motor is typically pre-installed with the stand. Verify all connections are secure. The motor features a speed regulator for precise control over sewing speed.

Figure 4.2: Electronic DC Servo Motor with speed regulator.

4.4 Chair Assembly

The task chair requires minimal assembly. Follow the instructions provided with the chair to attach the backrest, seat, and casters to the base. The chair's height is adjustable from 34.6 to 37.8 inches.

Figure 4.3: Included ergonomic task chair.

5. Operating Instructions

5.1 Powering On/Off

Locate the power switch, usually on the table's underside or near the motor. Flip the switch to the 'ON' position to power the machine. The motor operates silently when idle.

5.2 Threading the Machine

Follow the threading path indicated on the machine head. Ensure the thread passes through all guides and tension discs correctly. Incorrect threading can lead to skipped stitches or thread breakage.

Figure 5.1: JUKI DDL-8700 machine head.

5.3 Adjusting Thread Tension

The thread tension can be adjusted using the tension dial on the machine head. Adjust as necessary to achieve balanced stitches on both the top and bottom of your fabric.

5.4 Stitch Length Adjustment

The stitch length can be adjusted up to a maximum of 5 mm. Use the stitch length dial or lever on the machine head to select your desired stitch length. For easier adjustment, press the lever while turning the dial.

5.5 Presser Foot Lift and Knee Lifter

The presser foot can be lifted manually or using the knee lifter mechanism. The maximum foot lift is 5.5 mm by hand and 13 mm using the knee lifter. The knee lifter allows for hands-free lifting of the presser foot, which is convenient for handling fabric.

Figure 5.2: Foot pedal and knee lifter mechanism.

5.6 Reverse Stitching

To engage reverse stitching, press the reverse lever located on the machine head. This is used for securing stitches at the beginning and end of a seam.

5.7 Speed Control

The electronic DC Servo Motor allows for variable speed control. Adjust the speed regulator dial on the motor to set the maximum sewing speed. This is particularly useful for beginners who may prefer a slower speed, or for intricate work requiring precise control.

6. Maintenance

6.1 Cleaning

Regularly clean lint and dust from the bobbin area, feed dogs, and tension discs using a brush or vacuum. Ensure the machine is unplugged before cleaning.

6.2 Lubrication

Check the oil level in the oil pan regularly and refill as needed. Refer to the machine head's specific lubrication points for additional oiling requirements, typically indicated by red dots or specific instructions in the detailed manual.

6.3 Needle Replacement

Replace needles frequently, especially when sewing different fabric types or if the needle becomes dull or bent. Use needles of type DBX1 (16x231) in sizes 9-18, up to size 19.

7. Troubleshooting

• Skipped Stitches: Check needle installation, ensure it's inserted correctly and not bent. Verify proper threading and tension.
• Thread Breakage: Inspect for burrs on the needle plate or tension discs. Re-thread the machine, ensuring the thread is not snagged. Adjust tension if too tight.
• Uneven Stitches: Adjust thread tension for both upper and bobbin threads. Ensure the correct needle size for the fabric.
• Machine Not Starting: Check power connection, ensure the power switch is on, and the foot pedal is properly connected.

For more detailed troubleshooting, refer to the comprehensive manual or contact customer support.

8. Specifications

9. Warranty and Support

For warranty information and customer support, please refer to the documentation provided by your retailer or contact JUKI customer service directly. Keep your purchase receipt and model number handy for any inquiries.