Singer 491D Service Manual page 5

Class 491D Machines are high speed, rotary hook, fully automatic lubricated
long arm flat bed lockstitch machines with drop feed and hand operated reverse
feeding mechanism. Recommended for general stitching operations on a range of
light to heavyweight fabrics.
Balanced horizontal axis rotating hook.
Pendant link feed with feed leveling hinge pins.
Dial type stitch regulator on feed reverse lever,
Thread take-up lever guard. Equipped with improved head end lubrication.
Knee lifter mechanism is integral with the machine base and oil reservoir.
Arm top cover with oil flow indicator.
The arm is provided with a seat for mounting a light fixture.
Needle bar stroke
Clearance under presser foot
(Maximum lift of presser foot when raised with knee lifter - 12.7 mm)
Maximum stitch length
Maximum speed
Oil
Bed size
DESCRIPTION
GENERAL FEATURES
SPECIFICATIONS
- 1 -
30.5 mm - 491D200AA
36.5 mm - 491D300AA
7.2 mm - 491D200AA
7.9 mm - 491D300AA
6 S.P.I.
5,500 S.P.M. - 491D200AA
5,000 S.P.M. - 491D300AA
SINGER* Type "C" Oil
475 mm x 178 mm