Learning Objective: Recognize the procedures for disassembling and assembling the 111 W 155 sewing machine. 4-47. You may have to grind off the case hardening surface on a sewing machine screw before you can remove it with an easyout. 1. True 2. False 4-48. Which of the following screws has a left-hand thread? 1. Balance wheels retaining screw 2. Arm shaft connection setscrew 3. Feed eccentric adjusting screw 4. Thread take-up lever retaining screw 4-49. Which of the following screws is loosened a quarter of an inch and is NOT to be removed when you dissemble the 111 W 155 sewing machine? 1. Presser bar spring setscrew 2. Presser bar spring support screw 3. Vibrating presser bar connecting screw 4. Presser lifting link crank pinch screw 4-50. If binding should occur while removing the presser bar, what action should you take? 1. Apply a light oil coating 2. Turn the presser bar slowly with a back and forth motion 3. Both 1 and 2 above 4. Insert a screw driver into the lower slot of the presser bar while applying an upward motion on the presser 4-51. When you remove the presser bar, which of the following parts will fall off? 1. Presserbar spring bracket 2. Releasing bracket 3. Guide lever 4. All of the above 4-52. 4-53. 4-54. 4-55. 4-56. 4-57. 4-58. Which of the following parts prevents side to side movement of the needlebar rock frame? 1. The needlebar support bracket 2. The needlebar hinge bracket 3. The needlebar rock frame position bracket 4. The needlebar rock frame hinge bracket Which of the following parts eliminates end play in the balance wheel and arm shaft? 1. Balance wheel adjusting screw 2. Arm shaft shim 3. Balance wheel shim 4. Arm shaft bushing Which of the following parts transfers the motion from the arm shaft to the needlebar? 1. The needlebar rock stand 2. The needlebar driving shaft 3. The needlebar rock shaft 4. The needlebar driving stud What is used to remove the needlebar crank friction washer from the sewing machine after you remove the arm shaft? 1. Allen wrench 2. Needle nose pliers 3. Index finger 4. Spanner wrench Which of the following parts controls the feeding mechanism of the sewing machine? 1. Feed driving eccentric 2. Safety clutch 3. Feed lifting eccentric 4. Feed drive gear Which of the following parts converts the longitudinal motion of the hook driving shaft to the horizontal motion of the sewing hook? 1. Hook saddle assembly 2. Hook pinion gear 3. Hook driving gear 4. Hook drive eccentric What part allows the thread to pass between the bobbin case and the throat plate? 1. The bobbin case opener 2. The thread take-up lever 3. The thread controller spring 4. The bobbin case gib 19