Page 2 - SAFETY INSTRUCTIONS; Indications; CAUTION; Safety indications and their meanings
CB3-B916A/B917A i This service manual is intended for B916A/B917A; be sure to read the B916A/B917A instruction manual before this manual.Carefully read the "SAFETY INSTRUCTIONS" below and the whole of this manual to understand this product before you startmaintenance.As a result of research ...
Page 3 - WARNING; Environmental requirements
ii CB3-B916A/B917A 2. Notes on safety WARNING CAUTION Do not put your hand into any openings near the belt, as your hands could get caught inthe belt, and serious injury could result. Environmental requirements Use the sewing machine in an area which is freefrom sources of strong electrical noise su...
Page 4 - Sewing
CB3-B916A/B917A iii CAUTION Sewing This sewing machine should only be used byoperators who have received the necessarytraining in safe use beforehand. The sewing machine should not be used for anyapplications other than sewing. Be sure to wear protective goggles when usingthe machine.If goggles are ...
Page 6 - CONTENTS; DISASSEMBLY; Troubleshooting
CONTENTS 1. MECHANICAL DESCRIPTIONS ---------------1 1-1. Start mechanism 1 1-2. Number of stitches changing 2 1-3. Brake mechanism 3 1-4. Needle bar mechanism 4 1-5. Looper mechanism 4 1-6. Feed mechanism 5 1-7. Thread trimmer mechanism 7 1-8. Button clamp mechanism 8 1-9. Tension release mechanism...
Page 7 - MECHANICAL DESCRIPTIONS
1.MECHANICAL DESCRIPTIONS CB3-B916A/B917A 1 Clutch lever Clutch assembly Ball presser plate Ball bearing 5/16 Pulley Stop cam Drive shaft 2.Press 3.Press Lower shaft 4.Clutch mounts here 1.Depress pedal 101s 1. MECHANICAL DESCRIPTIONS 1-1. Start mechanism Clutch connects here Press in with the ball ...
Page 21 - ASSEMBLY AND ADJUSTMENT
3. ASSEMBLY AND ADJUSTMENT CB3-B916A/B917A 15 3. ASSEMBLY AND ADJUSTMENT 3-1. Needle bar 1. The screw flat of the drive shaft lever should face up and be inserted through the needle bar drive lever and set collar . 2. Line up the end of the drive shaft lever with the frame and secure with the screw ...
Page 34 - REPLACEMENT OF PARTS
4.REPLACEMENT OF PARTS CB3-B916A/B917A 28 4. REPLACEMENT OF PARTS 4-1.Horizontal feed cam, vertical feed cam, worm gear, worm, number of stitches adjustment cam < Disassembly > Disassemble in numerical order. Assembly and adjustment of the sewing machineshould only be carried out by a qualifie...
Page 41 - -4.Clearance between needle bar and looper
5.ADJUSTMENT CB3-B916A/B917A 35 5. ADJUSTMENT 5-2.Loop spreader With the needle bar at the lowest position, align the referenceline of the needle bar with the lower edge of the needle barmetal. Move the needle to its lowest position by rotating the pulley.When the loop spreader has been advanced to ...
Page 43 - -13.Pulley clearance in thrust direction
5. ADJUSTMENT CB3-B916A/B917A 37 5-12.Worm and worm gear backlash Adjust the feed cam to obtain a backlash of approximately 0.3mm. The clearance between the pulley and the clutch plate shouldbe 0.8 mm. 424s Worm Horizontal feed cam Worm gear Tighten Loosen Approx. 0.3 mm Pulley Ball presser plate Sc...
Page 56 - SERVICE MANUAL
118-916/917I00707902000.07. F (1) SERVICE MANUAL NAGOYA, JAPAN Printed in Japan