Jacobsen J-125AS Service Manual Download Page 1 | Manualshive

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Summary of Contents for J-125AS

Page 1: ...NE SERVICE MANUAL I HORIZONTAL VERTICAL c OB J 125VBS J 125AS 17 lfl J 125VES 4 0 J 1251 A o J 175VES LAW J 125G J 175VDSJ J 175A B C CA J 225VASJ JACOBSEN MANUFACTURING COMPANY Racine Wisconsin PRICE...

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Page 3: ...del variations are covered in separate paragraphs The disassembly and reassembly procedure is simplified by references to the exploded views which indicate the disassembly of parts by numerical sequen...

Page 4: ...erial No 9 Edge R Trim J 100 H 2 x 1 1 2 32A9 6663 9 Edge R Trim J 125 H 2 x 1 1 2 10 Trimo J 100 V 2 x 1 1 2 3110 5228 10 Trimo J 125 V 2 x 1 1 2 18 Pacer J 100 H 2 x 1 1 2 42C18 17073 18 Pacer J 125...

Page 5: ...Overhaul 13 4 3 Carburetor Overhaul 16 4 4 Fuel Line and Tank 18 4 5 Adjustments 18 4 6 starter Overhaul 19 Paragraph SECTION V MAJOR OVERHAUL 5 1 General Information 5 2 Engine Disassembly 5 3 Cleani...

Page 6: ...SECTION I SERVICE AND OPERATION J 125 Vertical Engine J 100 Horizontal Engine J 175 Vertical Gyro Start Spring Starter J 175 Vertical Engine J 175 Horizontal Engine J 225 Vertical Engine 4...

Page 7: ...1 2 ENGINE MODEL IDENTIFICATION Jacobsen 2 cycle engines are built with horizon tal or vertical crankshafts in horsepowers ranging from 1 8 to 4 25 H P They are also identified by the Mower type and s...

Page 8: ...e fly wheel revolves around the stationary pole pieces in the armature plate assembly As the ends of the magnet pass by the pole pieces an alternating mag netic flux is established through the ignitio...

Page 9: ...n the cylinder and add to inefficient operation of the engine To properly clean the air cleaner remove from engine and disassemble FOIL TYPE CLEANER Wash and rinse thoroughly in gasoline or other solv...

Page 10: ...1600 Up to 3500 1300 to 1600 Up to 3500 1500 to 1800 3000 to 3200 1500 to 1800 Up to 3500 1500 to 1800 Up to 3400 1500 to 1800 3000 to 3200 1300to 1600 Up to 3800 1900 to 2100 Up to 3750 1300to 1600 U...

Page 11: ...exhaust ports C Engine overheating D Engine runs too fast A Dress adjust to 020 and clean B Check and replace if necessary C Clean with a household detergent Drill a 1 8 vent hole in the breaker box...

Page 12: ...ptimum E Clean air filter or replace A Clean or replace valve B Clean carburetor and fuel tank C Reset float level D Clean air filter or replace E Set high speed needle 1 1 4 turns open and re adjust...

Page 13: ...o lock piston at bot tom dead center for easy removal of starter pawl assembly C Oil Seal Starter Sleeve use on crankshaft to protect oil seal when removing or installing back plate or crankcase head...

Page 14: ...nnecting Rod 70 75 inch pounds all models J 125 H J 100 H J 125 V 2 0015 2 0015 2 0010 2 0010 1 9970 1 9970 1 9965 1 9965 0905 0905 089 089 50025 50025 49975 49975 5003 5003 5000 5000 50125 50125 5007...

Page 15: ...thoroughly For minor overhaul of engine refer to the follow ing Magneto Overhaul paragraph 4 2 Carburetor Overhaul paragraph 4 3 Fuel Line and Tank paragraph 4 4 Adjustments paragraph 4 5 Starter Over...

Page 16: ...necessary Check breaker spring and mechanism to be sure they are in good operating condition F Test the ignition coil and condenser if testing equipment is available To remove coil and condenser refer...

Page 17: ...ly with a screw driver being careful not to damage keyway See figure 11 4 Remove four screws securing magneto back plate to crankcase On J 100 and J 125 engines place oil seal sleeve figure 5 over thr...

Page 18: ...sassembly pro cedure of carburetor that applies All parts are numbered in order of disassembly 16 A Remove fuel line from inlet on carburetor See figure 13 NOTE If fuel line is difficult to disen gage...

Page 19: ...djust ment screw the packing nut and packing must be removed and reassembled as di rected above If nut and packing are not removed and installed correctly small pieces of packing will be pushed into f...

Page 20: ...st have to be re moved If necessary release bands hold ing tank to cowling or adapter bracket Clean out tank thoroughly with a grease solvent If a gummy substance still re mains use alcohol to clean B...

Page 21: ...from ratchet shaft Remove pulley assembly from brack et Remove spring from pulley and bracket Remove cord from pulley 4 Replace cord if frayed or broken Replace pulley if spot welds on hub are cracked...

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