This manual provides the specifications, installation steps, air pipe connection, and thread trimming of MF-7900(D)/UT55,56,57 for users to refer to.
This manual provides step-by-step instructions for installing accessories, adjusting thread trimmer mechanisms, and maintaining the JUKI MF-7900(D)/UT55,56,57 coverstitch machine. It includes detailed procedures for setting up components like the presser lifting cylinder, air regulator, and SC-921 control box. Sections cover air piping, threading, and adjustment of looper and top covering thread trimmer mechanisms. Maintenance tasks such as cleaning the motor fan are also described.
| Model | MF-7900 series, MF-7900D series |
|---|---|
| Stitch Type | ISO standard 406, 407, 602, and 605 |
| Sewing Speed | Max. 6,500 sti/min (at the time of intermittent operation) |
| Needle Gauge | 3-needle: 5.6 mm and 6 mm, 2-needle: 4 mm, 3.2mm, 4.0 mm and 4.8mm |
| Stitch Length | 0.9mm to 3.6 mm (can be adjusted up to 4.5 mm) |
| Dimensions | Height 450 x Width 456 x Length 299 |
| Weight | 45 kg (With pneumatic type thread trimmer), 42 kg |
| Lift of Presser Foot | 8 mm (needle gauge : 5.6 mm without top covering), and 5 mm (with top covering) |
| Lubricating Oil | JUKI GENUINE OIL 18 |
Max. 6,500 sti/min (at the time of intermittent operation).
3-needle: 5.6 mm and 6 mm, 2-needle: 4 mm, 3.2mm, 4.0 mm and 4.8mm.
45 kg.
JUKI GENUINE OIL 18.