Part of the Kubota Repair Manuals.
This Kubota B7400, B7500 Workshop Manual (OEM #No.97897-12490) stays on one machine: your compact tractor, hydrostatic or manual transmission. Wiring diagrams map the starting circuit, charging system, glow plugs, and safety switches. Hydraulic schematics trace fluid through the HST, control valve, relief valve, and power steering circuit (B7500). The torque section alone runs 27 tightening specs across every major system: rear wheel hub mounting nuts at 108-125 N·m, front wheel mounting nuts at 77.5-90.1 N·m. Both the hydraulic oil filter and engine oil filter come out at 50 hours initial, then every 200 hours after. Service intervals sit on one page instead of scattered across forum threads. Search it by keyword, open it on a phone at the machine, and print the pages you need.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Instructions | Safety First, Before Servicing and Repairing, Safety Starting, Safety Working, Avoid Fires, Ventilate Work Area, Prevent Acid Burns, Dispose of Fluids Properly | |
| General | Features, Tractor Identification, Handling Precautions for Electrical Parts and Wiring (Battery, Fuse, Connector, Handling of Circuit Tester), Lubricants, Fuel and Cooling Water | |
| Mechanism (Engine) | Engine Body (Cylinder Block, Cylinder Head, Crankshaft, Piston and Piston Rings, Connecting Rod, Camshaft, Fuel Camshaft, Rocker Arm, Intake and Exhaust Valve, Valve Timing, Flywheel, Air Cleaner, Muffler) | |
| Servicing (Engine) | Troubleshooting, Servicing Specifications [D722-E-D16], Servicing Specifications [D1005-E-D16], Tightening Torques, Checking, Disassembling and Servicing | |
| Mechanism (Clutch) | Features, Linkage Mechanism, Operation | |
| Servicing (Clutch) | Troubleshooting, Servicing Specifications, Tightening Torques, Checking, Disassembling and Servicing, Checking and Adjusting | |
| Mechanism (Transmission) | Structure (Hydrostatic Transmission Type, Manual Transmission Type) | |
| Servicing (Transmission) | Troubleshooting, Servicing Specifications, Tightening Torques, Checking and Adjusting, Disassembling and Assembling, Separating Engine From Clutch Housing | |
| Mechanism (Rear Axle) | Features (Differential Gear Shaft, Ball Bearing, Rear Axle Case, Rear Axle, Spur Gear, Differential Gear, Spiral Bevel Gear, Differential System, Piston and Connecting Rod, Crankshaft, Servicing, Cylinder Head and Valves, Timing Gears, Camshaft and Fuel Camshaft, Cylinder) | |
| Servicing (Rear Axle) | Tightening Torques, Checking, Disassembling, Separating Rear Axle Case (Draining Transmission Fluid, From Differential Gaer Case), Disassembling Rear Axle Case | |
| Mechanism (Brakes) | Features (Wet Disc Brakes, Reduced Disc Wear, Stable Braking, Pedal Stroke Does Not Change Under Influence of Heat, Parking Brake, Fade, Relationship Between Temperature and Friction Coefficient of Brake Disc) | |
| Servicing (Brakes) | Troubleshooting, Servicing Specifications, Tightening Torques, Checking, Disassembling and Servicing, Brake Pedal, Disassembling and Assembling | |
| Mechanism (Front Axle) | Structures (Axle, Axle Flange, Bevel Gear, Differential Gear, Spiral Bevel Gear, Differential System), Front Wheel Alignment (Camber, Kingpin Angle, Caster), Toe-In | |
| Servicing (Front Axle) | Troubleshooting, Servicing Specifications, Tightening Torques, Checking, Disassembling and Servicing, Checking and Adjusting | |
| Mechanism (Steering) | Manual Steering System (Bearing, Sector Shaft, Steering Gear Case, Top Cover, Worm Shaft, Ball Nut, Ball Guide, Screw, Ball, Pitman Arm) | |
| Servicing (Steering) | Troubleshooting, Servicing Specifications, Tightening Torques, Checking, Disassembling and Servicing | |
| Mechanism (Hydraulic System) | Hydraulic Circuit, Hydraulic Pump, Hydraulic Block Type Outlet, Control Valve, Relief Valve, Feedback Linkage for Position Control, Hydraulic Cylinder | |
| Servicing (Hydraulic System) | Troubleshooting, Servicing Specifications, Tightening Torques, Checking, Disassembling and Servicing | |
| Mechanism (Electrical System) | Wiring Diagram and Electrical Circuit, Starting System (Starter, Glow Plug, Safety Switch), Charging System (AC Dynamo, Regulator) | |
| Servicing (Electrical System) | Troubleshooting, Servicing Specifications, Tightening Torques, Checking, Disassembling and Servicing, Battery (Checking) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Front wheel mounting nut torque | 77.5 to 90.1 N·m (7.9 to 9.2 kgf·m, 57.1 to 66.5 ft-lbs) | p. 20 |
| Rear wheel hub mounting nut torque | 108 to 125 N·m (11.0 to 12.8 kgf·m, 80 to 93 ft-lbs) | p. 20 |
| Hydraulic oil filter (for HST) replacement interval | Initial 50 Hours, Every 200 Hours | p. 21 |
| Hydraulic oil filter replacement interval | Initial 50 Hours, Every 200 Hours | p. 21 |
| Engine oil filter replacement interval | Initial 50 Hours, Every 200 Hours | p. 21 |
| Fuel filter element cleaning interval | Every 50 Hours | p. 21 |
| Fuel filter element replacement interval | Every 400 Hours | p. 21 |
| Air cleaner primary element cleaning interval | Every 50 Hours | p. 21 |
| Air cleaner primary element replacement interval | Every 1 Year or every 6 times of cleaning | p. 21 |
| Battery capacity at 5H.R (A.H.) | 36 | p. 30 |
| Battery reserve capacity (min.) | 71 | p. 30 |
| Starter M terminal nut torque | 8.8 to 11.8 N·m (0.9 to 1.2 kgf·m, 6.5 to 8.7 ft-lbs) | p. 95 |
