Service Manual. Cub & Cub Lo-Boy

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International Harvester Service Manual Cub & Cub Lo-Boy Service Manual THIS

WITHOUT THE AUTHORIZATION OF INTERNATIONAL HARVESTER OR IT S SUCCESSORS.

1 International Harvester Service Manual Cub & Cub Lo-Boy Service Manual THIS IS A MANUAL PRODUCED BY JENSALES INC. WITHOUT THE AUTHORIZATION OF INTERNATIONAL HARVESTER OR IT S SUCCESSORS. INTERNATIONAL HARVESTER AND IT S SUCCESSORS ARE NOT RESPONSIBLE FOR THE QUALITY OR ACCURACY OF THIS MANUAL. TRADE MARKS AND TRADE NAMES CONTAINED AND USED HEREIN ARE THOSE OF OTHERS, AND ARE USED HERE IN A DESCRIPTIVE SENSE TO REFER TO THE PRODUCTS OF OTHERS. IH-S-CUB

2 Cub Starting Serial Numbers Cub Starting Serial Numbers Paint Codes Ag Farmall Antique Red (to 1981) IH R3 (Aerosol) IH R2 (Quart) IH.B90882 (Gallon) Silver (for Wheel rims) IH...b17567 (Aerosol) IH...b17565 (Quart) IH.b17563 (Gallon)

3 Service Manual CUB AND CUB La-BOY' TRACTORS INTERNAnONAL HARVESTER -:.:=;,. NORTH AMERICA OPERATIONS AGRICULTURAL EQUIPMENT GROUP 401 NORTH UICHIGANAVENUE CHICAGO, ILUNOIS, 60611, U.S.A.

4 FARMALL CUB The Farmall Cub was a tractor for small acreages and for truck and vegetable farms. It remained in the lineup from 1947 to This was further vetific~tion of the demand for a small tractor. As rotary mowers became popular, many Cub tractors were equipped with the underslung mower. The Cub was marketed to parks, cemeteries, large estates, municipalities and to small farms. International used their own valve-in-head'four cylinder engine of 59 CID. It was the smallest tractor made by the company with only a 2 5/8 by 2 3/4 inch bore and stroke. The engine speed was rated at 1600 RPM. The tractor weighed about 1,480 lbs. and recorded 8.8 HP on the drawbar. A three speed transmission of 2.1, 3.1, and 6.4 MPH was standard equipment. A tire size of 6-24 for the rear and 4-12 for the front further denoted the smallness of the Cub. The tractor was equipped with an adjustable wide front. The advertising listed more than a dozen implements that were available and designed for the tractor. Fuel economy of the Cub was 8.6 HP hours per gallon of gasoline. An improved model of the Farmall Cub was tested in 1956 and recorded about 10 HP on the drawbar. other major differences were engine speed increased to 1800 RPM, tire size increased to 8-24 on the rear wheels' (the front remained the same), and transmission speeds increased to 2.4, 3.2 and 7.3 MPH. Fuel economy was 8.5 HP hours per gallon, which was slightly less than the Cub model tested nine years earlier. During the period 1947 through 1958 International was to market more than 225,000 Farmall Cub Tractors. Over 47,000 were sold in 1948, the peak year of production. Compiled and Reproduced From Originals by Jensales Inc,

5 General Contents Safe Work Rules... '... IV & V Standard Torque Data for Nuts and Bolts.... VI Special Service Tools Required VII Sedion [IJ III

6 Section 1 ENGINE CONTENTS SPECI FICATIONS ENGINE REMOVAL ENGINE INSTALLATION CYLINDER HEAD VALVES Valve Lash Adjusting Procedure. Removing Valves Inspection. General Valves. Valve Seat Retainer Keys Valve Guides. Valve Seats. Rotocap.. Testing Rotators Reconditioning. Valve Guides. Valves. Valve Seats. Refacing Seats Reassembly CONNECTING RODS, PISTONS AND PISTON RINGS General... Connecting Rods Pistons Piston Rings Piston Pins

7 Removal.. Disassembly. Inspection and Repair Reassembly.. Piston Fit in Bore Bearing Fitting Procedure. Installation CRANKCASE CYLINDER RE-BORING PROCEDURE When to Re-Bore.. Preparing the Block. Re-Boring. Honing. Cleaning. Checking Clearance TIMING GEAR TRAIN AND FRONT COVER General CAMSHAFT General. CRANKSHAFT AND MAIN BEARINGS General.... LUBRICATING OIL PUMP General Description. Oil Pump... Pressure Regulator Valve. Removal and Disassembly. Inspection and Servicing. Reassembly..... COOLING SYSTEM General Description and Operation Removal of Radiator Assembly. Inspection and Repair... Installation of Radiator Assembly Cooling Fan Service TROUBLE SHOOTING I TUNE-UP GSS-1411 (Rev. No.1) Printed in United States of America 1-2

8 1-3

9 Reassembly 1. Coat the valve stems with engine oil and insert the intake and exhaust valves into their original positions. 2. Install the valve springs and valve spring seats. Compress the valve springs and install the valve seat retainer keys. Release the springs and remove the valve compressor. 3. Adjust the valve tappets. Refer to page Install the valve tappet cover using a new gasket. 5. Install the intake and exhaust manifold assembly using a new gasket. Tighten the nuts evenly in steps to 20 ft. lbs. torque. 6. Install the cylinder head. Refer to page Refill the radiator with coolant. CONNECTING RODS, PISTONS AND PISTON RINGS General / I 1 2 O~O FESM CCTIIT'""Tt?_ 3 ==~:; ~ =-'-~ta~" ~ 7 5 ~ Retainer 2. Pin 3. Compression ring 4. Compression ring 5. Oil control ring 6. Piston 7. Piston with rings 8. Bol t assembly 9. Nut 10. Bushing 11. Rod assembly 12. Bearing Assembly 12 BWI ~ Connecting Rods The connecting rods serve as the links between the pistons and the crankshaft. The surfaces of the rods must be kept free of scoring and dents because of the high stresses under which they function. The rod has a bushing at each end, the one at the upper end is a bushing for the piston pin which anchors it to the piston. The bearing at the crankshaft or lower end is inserted in two halves which fit around the crankshaft and are secured by a bearing cap. The bearing cap is furnished only with its connecting rod. The lower bearings used in these engines are the replaceable insert type and insure correct rulming clearances when they are properly installed. This is possible without boring, reaming, scraping or using shims. The three important fundamentals on bearings and bearing fitting are "bearing crush," ''bearing spread," and ''bearing clearance." An explanation of these will be covered later. 1-25

10 Probable Cause Remedy Engine Will Not Turn Over 1. Cranking motor inoperative Or defective Battery faulty' Cables and terminals faulty starting switch defective Internal seizure Replace. Replace Battery. Inspect ground cable and battery-tostarting switch cable for any faults which may cause shorting; also inspect for incorrect connections. Replace cables if necessary.. Replace starting switch. Hand crank engine with spark plugs removed and clutch disengaged. If engine does not turn easily, internal damage is indicated. Engine Turns But Will Not start 1. Fuel system faulty (a) No fuel in tank.... (b) (c) (d) Fuel strainer bowl screen clogged Water in gasoline..... No gasoline at carburetor Battery charge low and does not turn engine fast enough Ignition system faulty. (a) Broken distributor rotor.... (b) Moisture in the distributor.... Fill tank with fuel. Clean bowl and screen. Drain gasoline tank, gasoline strainer and carburetor. Refill with clean gasoline. Clean fuel line from tank to carburetor. Clean fuel inlet screen in carburetor. Check for clogged vent holes in fuel tank cap. Charge or replace battery. Replace rotor. Remove cap and rotor and dry off. Use compressed air to remove moisture from distributor. 1-64

11 Section 2 FUEL SYSTEM CONTENTS Specifications Car buretor I General Description Carburetor Operation Liquid Level Check (Carburetor on Engine) Removal and Installation of Carburetor Inspection and Repair Assembly and Adjustment A Diagnosing Engine Troubles Governor Principles of Operation Removal, fuspection and Repair fustallation and Adjustment GSS-1411 (Rev_ No. 1) 2-1 Printed in United States of America

12 Section 3 STEERING, FRONT WHEELS AND FRONT AXLE CONTENTS SPECI FICATIONS. 3-2 FRONT WHEELS AND BEARINGS Removal Inspection and Repair Installation REMOVAL AND DISASSEMBLY OF FRONT AXLE ASSEMBLY. 3-5 INSPECTION AND REPAIR. 3-6 REASSEMBLY AND INSTALLATION OF FRONT AXLE ASSEMBLY. 3-7 STEERING ASSEMBLY Removal Disassembly _s 3-11 Inspection and Repair Reassembly e_ 3-12 Installation ADJUSTI NG TH E TOE-I N

13 A Steering wheel Woodruff key Steering shaft support arm Steering shaft support arm bracket Lubrication fitting Steering shaft and worm Steering shaft upper thrust washer Steering shaft lower thrust washer Steering shaft oil sea I Steering shaft bearing Steering shaft bearing gasket Steering gear housing assembly a ii filler plug Expansion plug Steering worm wheel shaft upper bushing Steering worm wheel shaft Woodruff key Steering worm wheel Steering worm wheel shaft lower bushing Steering gear base dowe I Steering gear base gasket Steering gear housing base Steering worm wheel shaft oil seal Steering worm wheel shaft thrust washer 24. Lubrication fitting 25. Steer ing gear arm 26. Steering gear arm plate shim 27. Steering gear arm plate 28. Steering gear arm retainer washer 29. Steering worm wheel shaft nut 30. Lubrication fitting 31. Steering gear arm 32. Steering gear arm plate shim 33. Steering gear arm plate 34. Steering wheel 35. a-ring 36.- Steering wheel cap 37. Steering gear arm 1. Install a new upper shaft bushing (14) in the steering gear housing (11) if it was removed. 2. Install a new shaft lower bushing (18) in the housing base (21) if it was removed. 3. Install a new oil seal (22) in the housing base (21). 4. Install the worm wheel shaft, (15) and the worm wheel (17) in the housing base (21). 3-13

14 Section 4 SPLITITING AND RECOUPLING THE TRACTOR CONTENTS FRONT SECTION SPLIT R ECOUPLI NG R EAR SECTION SPLIT RECOUPLING

15 Section 5 ENGINE CLUTCH CONTENTS SPECI FICATIONS REMOVAL DISASSEM BL Y..... INSPECTION AND REPAIR REASSEMBLY INSTALLATION CLUTCH ADJUSTMENT I

16 Section 6 () TRANSMISSION AND DIFFERENTIAL CONTENTS SPECIFICATIONS GENERAL REMOVAL... II 6-4 DISASSEMBL Y Differential.. " Transmission I NSPECTION AND R EPAI R 6-7 REASSEMBLY AND INSTALLATION. 6-8 I Transmission SPECI FICATIONS 'Type Selective, sliding spur gears Gears forward ~~; Gears reverse Countershaft gears (no. teeth) Bevel pinion....' Reverse speed gear st speed gear ' nd speed gear....../ rd speed gear..... ~

17 Section 6A POWER TAKE-OFF AND BELT PULLEY CONTENTS SPECIFICATIONS 6A-1 BELT PULLEY Removal and Disassembly A-3 Inspection and Repair A-4 Reassembly and Installation o. 6A-5 POWER TAKE-OFF Removal It Disassembly , e Inspection and Repair Reassembly Installation A-6 6A-7 6A-8 6A-8 6A-9 Belt Pulley SPECI FICATIONS I Drive. 0 ' Spline coupled to power take-off Bevel gear backlash - inch to.005 Pulley drive shaft (with pinion) diameters Inner bearing location - inches o to Outer bearing location - inch to.9846 Bearings Ball 6A-1

18 Section 7 FINAL DRIVE AND BRAKES CONTENTS SPECI FICATIONS FINAL DRIVE Removal Disassembly Differential Shaft Rear Axles Inspection and Repair Reassembly Rear Axles. Differential Shafts Installation.. BRAKES Removal Inspection and Repair Installation Brake Adjustment I 7-1

19 Section 8 HYDRAULIC SYSTEM Touch-Control CONTENTS SPECI FICATIONS 8-2 GENERAL Cleaning Handling of O-Rings PRINCIPLES OF OPERATION Hand Control and Rockshaft at Rest, Oil Circulating at Low Pressure Hand Lever Moved to Lower Implement, Showing Path of Oil to and from Rockshaft Piston 8-8 Hand Lever Moved to Raise Implement, Showing Path of Oil to and from Rockshaft Piston 8-12 REMOVAL e 8-14 DISASSEMBL Y Touch-Control Pump 8-16 Cylinder Block INSPECTION AND REPAIR REASSEMBLY INSTALLATION TROUBLE SHOOTING TEST PROCEDURE General I Procedure TROUBLE SHOOTING CHART 8-34 GSS 1411 (Rev. No.1) 8-1 Printed in United States of Amlirica

20 0 0 3 "'2, CD 0.. Q) :::J 0.. ::u CD "C.., C (') CD 0.. "Tl 00 (3 I c:,., 3 I-' Q... ~ olio :a CD ~ z!'... 0 ~, c.c :::J Q) en 0- '< c... CD :::J en Q) CD "U en s.. :::J (') a. :;' c: =.. CIl ;:;: a.!!i. IX!a. :I> 3 ~ g' 1. Check valve actuator plug 2. Washer 3. Check valve spring 4. Check valve 5. Piston sleeve boot 6. Bushing 7. Connecting rod 8. Connecting rod yoke 9. Seal ring 10. Piston 11. Seal ring 12. Cylinder block assembly 13. Yoke pin 14. Pressure regulator valve ball rider spring 15. Safety valve piston 16. Oil strainer 17. Safety valve spring 18. Pressure regulator valve piston 19. Gasket 20. Cylinder head 21. Safety valve sleeve 22. Orifice plug 23. Check valve actuator 24. Pressure regulator valve ball rider 25. Ball 26. Pressure regulator valve seat 27. Seal ring. 28. Check valve actuator lower stop 29. Washer 30. Seal ring 31. Control valve boot 32. Seal ring 33. Control valve operating lever stop 34. Operating lower stop lock 35. Control valve operating link 36. Operating link pin 37. Connecting rod pin 38. Control valve operating lever 39. Control valve pin 40. Operating lever pin Legend applies to Touch-Control assembly with block casting numbers Rl and Rl. 41. Control rod adjustable yoke 42. Control valve 43~ Gasket 44. Bottom cover 45. Relief valve screen 46. Relief valve (blocks Rl thru R4) 47. Relief valve elbow 48. Screw 49. Relief valve (block Rl) 50. Relief valve coupling 51. Nut 52. Tube 53. Elbow 54. Elbow 55. Control valve operating lever 56, Control valve pin 57. Operating lever pin 58. Control rod adjustable yoke

21 Section 9 ELECTRICAL CONTENTS SPECIFICATIONS Timing. Distributor. Dwell Angle Magneto Alternator Generators Voltage Regulators Cranking Motor WIRING DIAGRAM Complete Overhaul and Testing information is covered in GSS-1052-C. Timing SPECI FICATIONS Ignition timing (Before TDC) High idle ± 1 degree ~.. At 375 rpm (See Note).... NOTE: Proper ignition timing at high idle is essential for best performance and engine life. Therefore, the distributor should be set to give the exact timing at high idle. Any variance that may exist then will occur at the low idle end of the advance curve. GSS-1411 (Rev. No P;inted in United States of America I

4366, 4386, 4568, 4586 & 4786 Chassis Only

International Harvester Service Manual 4366, 4386, 4568, 4586 & 4786 Chassis Only Service Manual THIS IS A MANUAL PRODUCED BY JENSALES INC. WITHOUT THE AUTHORIZATION OF INTERNATIONAL HARVESTER OR IT S