Singer 312 U141 Service Manual Download Page 1 | Manualshive

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From the library of: Superior Sewing Machine & Supply LLC

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Summary of Contents for 312 U141

Page 1: ...SERVICE MANUAL SINGER Copyright 1977 THESINGER COMPANY AllRights Reserved Throughout the World From the library of Superior Sewing Machine Supply LLC...

Page 2: ...2 Howto insert the needles 8 3 Methodof threadingthe upper thread 8 4 How to wind the lower thread on the bobbin 9 5 How to adjustthe bobbin winder assembly 9 6 How to placethe bobbininto the hook 10...

Page 3: ...and feed drivingmechanism Automatically lubricated by means of an oiling device from the oil reservoir in machine arm and bed Others Handoiling 1 2HP 400W clutch motor D D SxS 8 0 1 Press stud for oil...

Page 4: ...pulley and motor pulley as illustrated Connect motor to power supply source with electrical cord extending from the switch HOW TO CONNECT THE MOTOR TO THE TREADLE Pressure on the treadle will be redu...

Page 5: ...cket on reverse side of table b Assemble the extension on lifting rod c Assemble knee plate connecting bar on knee plate d Mount the knee lifting bar and rod assem blies on knee lifter bracket 3 Adjus...

Page 6: ...everse side of table cut out as not to interfere with knee lifter operation secure oil pan to table using nails c VIBRATION PREVENTING RUBBER The vibration preventing rubber is used to stabilize the m...

Page 7: ...oir 2 Fill the reservoir to the red mark H of oil level indicator d Oil Reservoir located In Hook saddles 1 Remove slide plates to left and right of throat plate 2 Remove oil gauges from the left and...

Page 8: ...l supply 3 After proper adjustment tighten the nut PRECAUTIONS BEFORE STARTING TO SEW When machine is operated for the first time or after a long period of idleness proceed as follows a Refer to perti...

Page 9: ...ion and pass the thread in the order of the numbers own in Fig b Threading the thread from the left side spool LI Thread guide eft top cover L2 Thread retainer upper hole L2 Guide pin right L3 Pre Ten...

Page 10: ...ill not be drawn out smoothly and the thread tension will tecame irregular a In case of uneven winding 1 If it is inclined to left as B loosen the screw A shown in Fig and move the thread guide rest s...

Page 11: ...bobbin and unwind about 5 cm thread as shown in Fig e Place the bobbin on the post B shown in Fig f Then clamp down the latch lever A g As illustrated lead the end of thread through the groove of the...

Page 12: ...ated Then close the left and right slide plates e Place material beneath presser foot to com mence to sew f Rotate machine pulley so that needles pene trate the cloth g Then lower presser foot and com...

Page 13: ...button while the machine is running as this may cause damage to the machine 2 ADJUSTMENT OF THREAD TEN SION a Adjust the thread tensions according to the materials being sewn the thread used the leng...

Page 14: ...Adjust the tension of the spring accord ing to the materials to be sewn as fol lows a In case of medium weight fabric adjust ring tension to approximate ly 25 grams b In case of light fabric and shor...

Page 15: ...of the thread controller 2 Turn the stopper to the right to increase the operating range and to the left to decrease it 3 Securely tighten screw after making adjustments c Tension of Bobbin Thread Th...

Page 16: ...hest position by rotation of machine pulley above the throat plate Ihin Fabrics Approx 0 8mm above throat plate Standard Fabrics Approx 1 0mm above throat plate Heavy Fabrics Approx 1 2mm above throat...

Page 17: ...ents is the reverse of removal procedure described in step a 5 2 Replace throat plate by aligning the hook finger of throat plate with the pro tuberance of hook as illustrated c Ralative position of h...

Page 18: ...l face of needle and point of hook to measure 0 05mm as follows 1 Tilt machine head to rear and loosen hook saddle screws A B as illustrated 2 Loosen set screws C illustrated 3 Move hook saddles to ri...

Page 19: ...plate b Check the gap between hook and opener It should measure approximately 0 2mm as illustrated c If not adjust the position of opener after loosening screw B to obtain an approximate gap of 0 2mm...

Page 20: ...B of feed connect ing cranks as illustrated d Set machine head upright and adjust feed bar forward or backward so that the needles are positioned in the center of the needle holes e Repeat step b and...

Page 21: ...er life to the sewing machine Lubricate machine as follows 20 Maintenance of Oil Reservoirs and Periodic Lubrication Refer to pages 6 and 7 for specific main tenance and periodic lubrication procedure...

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