Case Model SI Tractor Parts Catalog

These old Case Model SI tractors usually live on small farms or acreages, pulling mowers, wagons, or light tillage gear, often in dusty, uneven ground. This parts catalog is what I grab when I need to see how a shaft, sprocket, or spindle is built up and which exact pieces belong together. If, for example, the rear axle sprocket is chewing up the chain, I use this book to trace the sprocket, hub, keys, and fasteners so I can order everything that’s worn, not just guess at one part.

Applications & Use Cases

Cross-check exploded views to see how shafts, shutters, and spindles stack with spacers, shims, and retainers.
Verify correct part numbers when there are different versions of the same tractor or updated components.
Identify small seals, bushings, and odd fasteners that are easy to miss when the tractor is still assembled.
Confirm related parts in a sub-assembly so you don’t reuse a worn companion piece with a new gear or sprocket.
Compare variant differences on things like starting and lighting parts before placing an order.

FAQ

Q: Can I use this catalog on a tablet in the shop?

A: Yes, it’s handy to zoom in on exploded diagrams and search part descriptions while you’re standing at the tractor.

Q: Is it worth printing sections of this?

A: Many techs print the relevant pages, mark them with notes and quantities, and take them right to the parts counter.

Safety Note

Always lock out the tractor, support it securely, and remove the key before inspecting or matching any parts.

Case Model SI Tractor Index:

Shaft – sliding gear, 71
Shutter – radiator, 52–53
Spark plugs, 31
Spindle – front wheel, 94
Sprocket – rear axle, 81
Starting crank, 54–55
Starting and lighting parts – electric, 40–44
Starting motor, 41
Steering gear, 98–101
Steering spindle, 98–101
Temperature gauge, 42
Thermostat, 50
Throttle and accelerator, 33
Tie rod, 99–101
Timing gear cover, 7
Tire pump, 117
Tool box, 113
Tools, 119
Transfers, 117
Transmission case, 67
Valves, 11
Water pump, 47
Weight – front wheel, 96
Weight – rear wheel, 84
Wheel – front, pneumatic tires, 95
Wheel – front, solid and zero pressure tires, 96
Wheel – rear, pneumatic tires, 82
Wheel – rear, solid and zero pressure tires, 83
Wires – ignition, 31
Accelerator, 33
Air cleaner, 33
Axle – front, solid mounted, 93
Axle – front, spring mounted, 89
Axle – rear, 81
Bearing liners, 9–10
Belt pulley, 68
Brake – foot, 74–78
Camshaft, 11
Carburetor, 27
Chain – roller, 81
Choke control, 42
Clutch, 61
Clutch shaft, 64
Clutch throwout parts, 63
Connecting rods, 9
Crankshaft, 9
Crank – starting, 54–55
Cylinder block, 7
Cylinder head, 7
Cylinder sleeve, 9
Differential shaft, 73
Drag link – steering, 99
Draw bar and counter weight, 116
Draw bar – regular, 114
Draw bar – swinging, 115
Electric lighting and starting parts, 40–44
Engine assembly, 5
Engine hood, 49
Extensions for dual rear wheels, 83
Extensions for rear wheels to provide 61″ tread, 82
Facings – clutch, 61
Fan, 47
Fenders, 85–86
First reduction shaft, 9
Flywheel, 9–10
Foot brake, 74–78
Fuel strainer, 57
Fuel tank – two way, 59
Fuel tank – gasoline, 56
Fuel tank – low cost fuel, 58
Gasket sets, 8
Gear shift parts, 102–105
Generator, 41
Governor, 31
Hood – engine, 49
Horn – electric, 44
Hour meter, 120
Ignition lock switch, 42
Ignition wires, 31
Instrument panel, 42
Intake pipe – air, 21
Lamp – head, 42–43
Lamp – tail, 42–44
Lifting attachment for solid mounted front axle, 93
Lifting attachment for spring mounted front axle, 90
Lighting and starting parts – electric, 40–44
Magneto, 31–39
Manifold – gasoline, 17
Manifold – low cost fuel, 19
Muffler – regular, 22
Muffler – spark arresting, 23
Oil filter, 13–15
Oil gauge, 42
Oil pan, 7
Oil pump, 12
Pistons, 9
Piston replacement rings, 9
Platform, 113
Power take off, 108–111
Pulley – belt, 68
Pump – oil, 12
Pump – tire, 117
Pump – water, 47
Push rods, 11
Radiator, 49
Radiator screen, 49
Radiator shutter, 52–53
Radius rod, 90–93
Rotocap, 11
Screen – radiator, 50
Seat – operator’s, 112
Shaft – differential, 73
Shaft – first reduction, 9
Shaft – rear axle, 81