Motor Pulley And Belt - JUKI MF-7800D Series Engineer's Manual

4. MOTOR PULLEY AND BELT

MF-7800D Series
Sewing speed of the
machine
(sti/min)
3,500
4,000
1 . The table shows the numbers when a 3-phase 2-pole 400 W clutch motor (1/2 HP) is used.
2 . The commercially-available motor pulley near to the counted value is designated since the outside diameter of
the commercially-available motor pulley counts by 5 mm.
3 . When you use a new sewing machine, use the machine at a speed of 4,000 sti/min or less for the first 200 hours
(approximately one month). A good result can be obtained in terms of the durability.
(Caution) 1. Use a motor pulley which is adaptable to this sewing machine.
2. This sewing machine will exceed its max. revolutions and max. sewing speed, finally leading
to the occurrence of malfunction, unless the adaptable motor pulley is used.
50Hz
Pulley size (mm)
ø80
ø90
Belt size (inch) Pulley size (mm)
M-38
M-38
– 5 –
60Hz
Belt size (inch)
ø65 M-37
ø75 M-37