5-21. CLOTHING SEWING MACHINE ARM SHAFT AND VERTICAL SHAFT MAINTENANCE - continued.
Do not overtighten screw (1) and nut (4). Allow free movement with minimal side play.
Install screw (1) through crank arm (2) and shuttle shaft (3) and secure with nut (4).
Make sure to rotate so the loop of the crankshaft (1) matches the cutout m the casting.
(1) Replace crankshaft (1).
Bearing assembly will need to be tapped in.
(2) Install bearing assembly (2) with flat over setscrew hole.