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 Kubota STα-30, STα-35 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 |
Kubota STα-30, STα-35 Common Problems This Manual Covers
Weak transmission or HST drive
Loss of drive, creeping, or poor range shifting traces to the hydrostatic transmission, range gear shift, or differential. The transmission section covers the HST, range and PTO shift sections, and the differential gear with mechanism and servicing.
Manual Section: 3 Transmission p. 136Hard starting or rough diesel running
Hard starting, low power, or smoke on the D1463 and D1703 engines usually comes from compression, valve clearance, or the injection nozzles. The engine section covers the cylinder head, valves, fuel system, and the servicing specifications.
Manual Section: 1 Engine p. 58Heavy or leaking power steering
Stiff steering or a leak points to the hydraulic pump, steering controller, or steering cylinder. The steering section covers the pump, controller, cylinder, hoses, and tie-rod end with service procedures.
Manual Section: 8 Steering p. 255Bi-speed turn not engaging
The bi-speed turn should speed the front wheels in a tight turn, and a fault usually lies in the hydraulic clutch pack, the solenoid valve, or a sensor. The bi-speed turn section covers the clutch pack, solenoid, angle and speed sensors, and the controller.
Manual Section: 7 Bi-Speed Turn p. 231Three-point hitch will not lift
A hitch that lifts slowly or not at all comes from the hydraulic pump, position control valve, relief valve, or the lift cylinder. The hydraulic system section documents the pump, control and relief valves, and the cylinder.
Manual Section: 9 Hydraulic System p. 277Battery not charging
A battery that drains between uses points to the charging or starting circuit. The electrical system section includes the wiring diagram, charging system, and starting system so you can test before replacing parts.
Manual Section: 10 Electrical System p. 313Frequently Asked Questions
Which tractors and engines does this manual cover?
It covers the Kubota STα-30 and STα-35 compact tractors. The STα-30 uses the D1463-M-ST diesel and the STα-35 uses the D1703-M-ST diesel; both are documented across all 359 pages.
Does it cover the bi-speed turn system?
Yes. The bi-speed turn section explains the hydraulic clutch pack, bi-speed solenoid valve, front wheel turning angle and travelling speed sensors, and the controller unit, with servicing. p. 231
Are torque specs and adjustments included?
Yes. Each section carries servicing specifications and tightening torques, from general bolt torques to engine, clutch, and steering values, along with checking and adjusting procedures. p. 23
How do I get the manual after purchase?
The PDF downloads right after purchase. Nothing ships and there is no wait; save it to your device and keep it for future service work.
Will this Kubota STα-30 Workshop Manual download right away?
A 359-page Workshop Manual in searchable PDF format, ready the moment checkout completes. View it on a computer, tablet, or phone. No shipping wait.
Are there any print restrictions on this Kubota STα-30 manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Does this Kubota STα-30 manual show the machine's wiring?
Included. The Kubota STα-30, STα-35 Workshop Manual covers complete wiring harness diagrams, electrical circuits, and connector pinouts.
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