Tajima TMAR Series: Essential Maintenance Schedule & Wear Parts Guide

1. Rotary Hook (KHS20-R or KHS20-RYP2) high likelihood

How to tell

Frequent thread breaks, skipped stitches, bird's nesting, poor stitch quality, excessive noise from the hook area. Inspect the hook point and race for burrs, nicks, or damage.

Fix

1. Clean the rotary hook and bobbin case area daily, removing lint and debris.
2. Inspect the hook point for burrs or damage. Use a jeweler's file to carefully smooth minor burrs, or replace the hook if significantly damaged.
3. Check the bobbin case tension and spring. Replace if worn or bent.
4. Lubricate the rotary hook as per your machine's manual, typically with a drop of oil at the designated points.

Ensure you use the correct rotary hook model for your TMAR machine, such as KHS20-R Jumbo Rotary Hook or Koban KHS20-RYP2 Rotary Hook Jumbo 2.0X with Trimmer.

Parts involved: Rotary hooks & bobbin cases →

2. Timing Belts (e.g., MBL S5M1270, MBL S5M1225, MBL S5M1160, MBL S5M900, MBL S5M625, Tajima TU10 W25-170/E, Tajima W20-S5M0950/G, Tajima W25-S5M Synchronous Drive Belt, Tajima Genuine MBL Trimming Belt S5M425, Tajima 10mm Synchronous Timing Belt) high likelihood

How to tell

Machine slowing down, inconsistent stitching, unusual noises (squeaking, grinding), visible cracks, fraying, or stretching on the belt surface. Belts may also slip, leading to timing issues or design misalignment.

Fix

1. Visually inspect all timing belts for signs of wear, cracking, fraying, or excessive slack.
2. Gently press on the belt to check for proper tension. Refer to your machine manual for specific tensioning guidelines.
3. If a belt is worn or damaged, carefully remove the old belt and install a new one, ensuring correct alignment and tension.
4. After replacement, perform a test sew to confirm proper machine timing and stitch quality.

Tajima TMAR machines use various timing belts for different functions (main shaft, X/Y movement, trimming). Always verify the correct part number and length, such as Genuine Japanese MBL S5M1270 Timing Belt 20mm or MBL S5M1225 Main Shaft Motor Belt 30mm.

Parts involved: Belts, pulleys & gears →

3. Needle Bar Drive Assembly Iron Cam (080220010A02 U8A300000010) medium likelihood

How to tell

Excessive noise or vibration from the needle bar area, inconsistent needle bar movement, skipped stitches, or needle breaks. Visual inspection may reveal wear or scoring on the cam surface.

Fix

1. Carefully inspect the needle bar drive assembly, particularly the iron cam, for signs of wear, scoring, or damage.
2. Check for any loose fasteners or excessive play in the assembly.
3. If significant wear is present, the Needle Bar Drive Assembly Iron Cam will need to be replaced. This is a more involved repair and may require professional assistance to ensure correct timing and adjustment.

Parts involved: Needles & needle bars → Head & mechanical parts →

4. TC Sensor Card & Thread Contact Set (0J2602300A22 0J2602300A23 FG7204010000 0J2602100010) medium likelihood

How to tell

False thread break errors, machine stopping without a visible thread break, or failure to detect actual thread breaks. This can also manifest as the machine not starting or continuing to sew after a thread break is cleared.

Fix

1. Clean the thread contact points and the sensor area with compressed air or a soft brush to remove lint and debris.
2. Inspect the thread contact wires for bends, breaks, or corrosion. Gently adjust if bent.
3. Check the wiring connections to the TC Sensor Card for looseness or damage.
4. If cleaning and inspection do not resolve the issue, the TC Sensor Card & Thread Contact Set may need to be replaced.

Also consider the Tajima ICS131 0J2603200000 Thread Break Sensor & Bracket if your machine uses this type.

Parts involved: Sensors & switches → Circuit boards & electronics →

5. Presser Foot Bushing Guide Collar (EF0613220000 EF0613210000 090460040020 090460040031) low likelihood

How to tell

Uneven stitching, fabric damage, or the presser foot not moving smoothly up and down. You might observe excessive play or wobbling in the presser foot assembly.

Fix

1. Inspect the presser foot bushing guide collar for visible wear, cracks, or deformation.
2. Check for excessive play in the presser foot's vertical movement.
3. If worn, the bushing guide collar should be replaced to ensure proper presser foot function and consistent stitch quality.

Parts involved: Presser feet & sewing parts → Shafts, bearings & bushings →