Brother International Z-8550A Instruction Manual - English - Page 74

12. STANDARD ADJUSTMENTS 12-11. Adjusting the rotary hook lubrication amount CAUTION Be careful not to touch your fingers or the lubrication amount check sheet against moving parts such as the rotary hook or the feed mechanism when checking the amount of oil supplied to the rotary hook, otherwise injury may result. Use the following procedure to check the amount of oil being supplied to the rotary hook when replacing the rotary hook or when changing the sewing speed. Approx.50 mm Approx.25 mm 3529M 3530M 1. Remove the thread from all points from the thread take-up to the needle. 2. Use the lifting lever to lift the presser foot. 3. Run the machine at the normal sewing speed for approximately 1 minute without sewing any material (following the same start/stop pattern as when actually sewing). 4. Place the lubrication amount check sheet (1) to the left of the rotary hook (2) and hold it there. Then run the sewing machine at the normal sewing speed for 10 seconds. (Any type of paper can be used as the lubrication amount check sheet (1).) 5. Check the amount of oil which has spattered onto the sheet. * Be sure to repeat this operation three to four times to check average lubrication amounts. * If adjustment is necessary, carry out the following operations in "Adjusting the lubrication amount". Too much Spattered oil Correct Too little Less oil 0611M More oil 1. Tilt back the machine head. 2. Turn the adjusting screw (3) to adjust the lubrication amount. • If the rotary hook adjusting screw (3) is turned clockwise, the lubrication amount becomes greater. • If the rotary hook adjusting screw (3) is turned counterclockwise, the lubrication amount becomes smaller. 3. Check the lubrication amount again according to the procedure given in "Checking the lubrication amount" above. * Turn the adjusting screw (3) and check the lubrication amount repeatedly until the lubrication amount is correct. 3531M Z-8550A, 8560A 66