Part of the Kubota Repair Manuals.
This 359-page Kubota STα-30 and STα-35 Workshop Manual is the factory service reference for these compact tractors, built around the D1463-M-ST and D1703-M-ST diesel engines. It divides each section into Mechanism and Servicing, so you learn how a system works before you take it apart.
Coverage runs the full machine: engine, clutch, transmission with hydrostatic drive, rear axle, brakes, front axle, the bi-speed turn system, power steering, hydraulics, and the electrical system with its wiring diagram. Servicing specifications, tightening torques, checking and adjusting, and disassembly and reassembly procedures are included throughout.
Owners and independent mechanics can use it to rebuild the transmission or HST, service the diesel engine, diagnose the bi-speed turn, sort out power steering, repair the hydraulics, or trace the electrical circuits. It is delivered as a downloadable PDF you can view on any device or print.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| G General | 13-57 | General |
| Engine | 58-116 | Fuel System, Cylinder Head and Valves, Piston and Connecting Rod, Crankshaft, Lubricating System, Cooling System |
| Clutch | 117-135 | Clutch Disc, Pressure Plate, Diaphragm Spring, Release Bearing, Clutch Shaft, Clutch Release Fork |
| Transmission | 136-191 | Hydrostatic Transmission (HST), Range Gear Shift Section, Front Wheel Drive Shift Section, Rear PTO Shift Section, Mid-PTO Shift Section, Differential Gear |
| Rear Axle | 192-200 | Rear Axle Case, Planetary Gear, Differential Lock Fork, Hypoid Ring Gear, Rear Axle Shaft, Planetary Carrier |
| Brakes | 201-210 | Brake Pedal, Brake Disc, Cam Plate, Brake Shaft, Parking Brake Lever |
| Front Axle | 211-230 | Front Wheel Alignment, Front Axle Case, Bevel Gear Case, Differential Gear, Pinion Shaft, Front Axle Bracket |
| Bi-Speed Turn | 231-254 | Hydraulic Clutch Pack, Bi-Speed Solenoid Valve, Front Wheel Turning Angle Sensor, Travelling Speed Sensor, Controller Unit, Bi-Speed Switch |
| Steering | 255-276 | Hydraulic Pump, Steering Controller, Steering Cylinder, Power Steering Hoses, Tie-Rod End |
| Hydraulic System | 277-312 | Hydraulic Pump, Position Control Valve, Flow Priority Valve, Relief Valve, Hydraulic Cylinder, Auxiliary Control Valve |
| Electrical System | 313-359 | Wiring Diagram, Starting System, Charging System, Lighting System, Gauges |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| General Use Screws, Bolts and Nuts (M6, No-grade or 4T) | 7.85 to 9.31 N·m | p. 23 |
| General Use Screws, Bolts and Nuts (M8, No-grade or 4T) | 17.7 to 20.5 N·m | p. 23 |
| Fuel tank capacity | 29.5 L (7.79 U.S.gals., 6.49 Imp.gals.) | p. 22 |
| Engine crankcase (with filter) capacity | 4.5 L (1.19 U.S.gals., 0.99 Imp.gals.) | p. 22 |
| Engine oil change | Initial 50 hours, Every 200 hours | p. 24 |
| Engine oil filter replace | Initial 50 hours, Every 200 hours | p. 24 |
| Engine Oil Capacity (with filter) | 4.5 L | p. 9 |
| Engine Coolant Capacity (with recovery tank) | 5.8 L | p. 9 |
| Transmission Fluid Capacity | 18.5 L | p. 9 |
| Front Axle Case Oil Capacity | 4.0 L | p. 9 |
| General Use Screws, Bolts and Nuts Tightening Torque (M10, Ordinariness) | 39.3 to 45.1 N·m | p. 23 |
| Clutch Pedal Free Travel | 20.0 to 30.0 mm | p. 28 |
