– 40 –
2) Precautions to be taken with respect
to the lubricating components
①
Feed bar components
Be careful of the orientation of the oil shield rub-
bers
❶
.
(2) Motor pulley and belt
1. The correct direction of rotation of the sewing machine is clockwise.
(Caution) Never allow the machine to rotate in the reverse direction. If the machine rotates
counterclockwise, the oil pump will fail to function resulting in seizure.
2. The best tension of the motor belt
❶
is that the belt can be pressed in about 10 mm by a fi nger.
3. Refer to the table shown below for the size of pulley
❷
and the sewing speed. (The above applies to both
the machine with table-fi xed type and the machine with fully-sunken one.)
4. After the adjustment, fi rmly fi x the belt cover
❸
with the setscrews
❹
.
Sewing speed (sti/min)
Motor pulley diameter (mm) / V-belt (in inches)
60 Hz
50 Hz
4,500
70 / 33
85 / 33
5,000
80 / 33
95 / 34
5,500
85 / 33
105 / 35
6,000
95 / 34
115 / 36
6,500
100 / 35
125 / 38
7,000
110 / 36
135 / 39
Common to the machine with table-fi xed table and the machine with fully-sunken one
❸
❹
10 mm
❶
❷
Be careful of
chamfered
orientation.
Operator's side
❶
