Part of the Case IH Repair Manuals.
Hydrostatic drive, rear PTO, three-point hitch hydraulics, and the full electrical system: this Case IH Farmall 20B, Farmall 25B service manual PDF walks every one of them end to end across 758 pages, issued under OEM number 47576301. Factory wiring diagrams trace each harness and connector, from the cold start aid through the parking brake circuit and PTO controls, while hydraulic schematics map oil flow through the fixed displacement pump, hitch control valve, and remotes. Exploded views and troubleshooting charts back up teardown procedures for the front axle, hydrostatic transmission, brakes, and steering. Rear wheel discs go back on the axle at 176 to 196 N·m (130 to 145 lb ft); the hydrostatic transmission retaining bolts take 29.4 to 34.3 N·m (22 to 25 lb ft). A hydro that creeps in neutral will not wait for dry weather. Bookmarked and text searchable, your copy rides along wherever you park the tractor, shop bench or headland.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| International Symbols | 9 | Thermostart, Alternator Charge, Fuel Level, Engine Speed, Engine Oil Pressure, Engine Coolant Temperature |
| Safety Rules | 10-14 | Personal Safety, Machine Safety, Accident Prevention, Fluid Power Systems, Safety Frame (ROPS), Diesel Fuel |
| Basic Instructions - Important Notice Regarding Equipment Servicing | 15 | Dealership Personnel, Special Tools, Manufacturer Responsibility, Continuous Improvement |
| Basic Instructions - Shop and Assembly | 16-17 | Shimming, Rotating Shaft Seals, O-Ring Seals, Sealing Compounds, Spare Parts |
| Basic Instructions Hardware | 18 | Metric Hardware, Plating, Nut Tightening, Locknuts, Jam Nuts, Thread Lubrication |
| Torque Specification Tables | 19-23 | Inch Non-Flanged Hardware, Metric Non-Flanged Hardware, Sae Hardware Identification, Metric Hardware Identification, Definitions |
| General Specification | 24-27 | Engine, Cooling System, Electrical System, Fuel System, Brakes, Steering |
| General Specification - Biodiesel Fuels | 28 | Biodiesel Fuel Usage Conditions, Engine Performance, Cold Weather Conditions, Fuel Storage |
| Dimension | 29-31 | Length, Wheel Base, Top of ROPS, Width, Minimum Ground Clearance, Wheel Tread Settings |
| Consumables | 32 | Engine Oil, Transmission/Hydraulic Oil, Front Axle/Gear Oil, Grease, Coolant |
| Product Identification | 33-34 | Product Identification Plate, Frame Location, Serial Number |
| Engine | 35-62 | Engine and Crankcase, Engine Lubrication System, Engine Cooling System |
| Front Axle System | 63-122 | Powered Front Axle, Front Bevel Gear Set and Differential, Final Drive Hub, Steering Knuckles, And Shafts |
| Rear Axle System | 123-150 | Rear Bevel Gear Set and Differential, Final Drive Hub, Steering Knuckles, And Shafts |
| Hydrostatic Drive | 151-256 | Transmission and Steering Hydrostatic Control, Hydrostatic Transmission, Reservoir, Cooler, And Lines, Pump and Motor Components |
| Power Take-Off (PTO) | 257-326 | Rear Mechanical Control, Rear Electro-Hydraulic Control, One-Speed Rear Power Take-Off, Central Power Take-Off |
| Brakes and Controls | 327-352 | Parking Brake or Parking Lock, Mechanical Service Brakes |
| Hydraulic Systems | 353-448 | Hydraulic Systems Overview, Fixed Displacement Pump, Three-Point Hitch Control Valve, Three-Point Hitch Cylinder, Remote Control Valves, Reservoir, Cooler, And Filters |
| Hitches, Drawbars, and Implement Couplings | 449-458 | Rear Three-Point Hitch |
| Steering | 459-534 | Tie Rods, Hydraulic Control Components, Cylinders |
| Wheels | 535-548 | Front Wheels, Rear Wheels |
| Electrical Systems | 549-748 | Electrical System, Fuel Injection System, Fuel Tank System, Engine Cooling System, Engine Oil System, Parking Brake Electrical System, Rear Power Take-Off Control System |
| Platform, Cab, Bodywork, and Decals | 749-758 | Mechanically-Adjusted Operator Seat |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Front Wheel Disc-to-Hub Torque | 93 - 108 N·m (69 - 80 lb ft) | p. 23 |
| Rear Wheel Disc-to-Axle Torque | 176 - 196 N·m (130 - 145 lb ft) | p. 23 |
| Disc Diameter | 223 mm (9 in) x 174 mm (7 in) | p. 337 |
| Disc Outer Diameter | 114 mm (4.5 in) | p. 337 |
| Fuel Tank Capacity | 25 l (6.6 US gal) | p. 24 |
| Engine Crankcase Oil Capacity (with filter) | 4 l (1.10 US gal) | p. 24 |
| Radiator Cap Pressure | 90 kPa (13 psi) | p. 24 |
| Hydraulic Lift System Pump Capacity | 27 l (7 US gal) | p. 26 |
| Hydraulic System Relief Valve Setting | 14997 kPa (2175.1 psi) | p. 26 |
| ROPS to Rear Axle Attaching Bolt Torque | 85 N·m (63 lb ft) | p. 27 |
| Farmall 20B | ||
| Engine Gross Horsepower (Farmall 20B) | 17 kW (23 Hp) | p. 24 |
| Farmall 25B | ||
| Engine Gross Horsepower (Farmall 25B) | 20 kW (27 Hp) | p. 24 |
