This is the Kubota service manual for the B2320, B2620, and B2920 compact tractors, supplied as a 406-page PDF download. It covers both the hydrostatic and manual transmission versions and the D1005-E3-D22, D1105-E3-D22, and D1305-E3-D22 diesel engines used across the range.The manual is built around the machine's systems: engine, clutch, transmission, rear axle, brakes, front axle, steering, hydraulics, and electrical, with the general section holding tractor identification, lubricants and coolant, tightening torques, and the full maintenance check list. Wiring handling and the safety start circuit are documented in the electrical section.Use it for real diagnosis and repair: torque tables, service intervals, safety switch values, and step-by-step procedures for owners and mechanics who service these Kubota tractors on their own.
What's Inside This Kubota B2320, B2620, B2920 Manual
| System | Pages | Key Topics |
|---|---|---|
| Intro | - | Safety First, Before Servicing And Repairing, Safety Starting, Safety Working, Avoid Fires, Ventilate Work Area, Prevent Acid Burns, Dispose Of Fluids Properly, Prepare For Emergencies, Safety Decals |
| General | - | Tractor Identification (Model Name and Serial Number, Cylinder Number), Handling Precautions for Electrical Parts and Wiring (Battery, Fuse, Connector, Handling of Circuit Tester) |
| Sect 1 Engine | - | Engine Body (Closed Breather, Half-Floating Head Cover, Governor, Half-Floating Head Cover [D1305], Three Lever Type Fork Lever, At Rated Operation, Overloaded Operation) |
| Sect 2 Clutch | - | Linkage Mechanism |
| Sect 3 Transmission | - | Structure (Hydrostatic Transmission Type, Manual Transmission Type) |
| Sect 4 Rear Axle | - | Structure |
| Sect 5 Brakes | - | Linkage, Operation (During Braking) |
| Sect 6 Front Axle | - | Structure |
| Sect 7 Steering | - | Structure (Steering Linkage, Power Steering, Manual Transmission Type, Hydrostatic Transmission Type) |
| Sect 8 Hydraulic | - | Hydraulic Circuit, Hydraulic Pump, Control Valve Assembly (Structure, Operation), Three Point Hydraulic System (Feedback Linkage, Control Valve, Relief Valve, Hydraulic Cylinder) |
| Sect 9 Electrical | - | Wiring Diagram, Engine Starting System and Stopping System (Opc System Circuit, Controller, Safety Switch and Engine Condition) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Joint bolt (Front loader pipe) torque | 48 to 56 N·m (4.9 to 5.7 kgf·m, 36 to 41 lbf·ft) | p. 210 |
| Rear wheel mounting nut torque | 145 to 150 N·m (14.8 to 15.3 kgf·m, 107 to 111 lbf·ft) | p. 194 |
| Seat switch resistance (Operator on the seat) | 0 Ω | p. 387 |
| PTO Switch 1 resistance (PTO gear shift lever in "NEUTRAL" position) | 0 Ω | p. 392 |
| Min. Turning Radius (with brake) | 2.1 m | p. 9 |
| Max. Lift Force (At lift points) | 615 kg | p. 10 |
| General Use Bolt Torque (M10, Property class 8.8) | 48 to 55 N·m | p. 26 |
| B2320, B2620, B2920 (Manual Transmission Models) | ||
| Main Shift Switch resistance (Main gear shift lever in "NEUTRAL" position) | 0 Ω | p. 391 |
| B2320HSD, B2620HSD, B2920HSD (HST Models) | ||
| HST safety switch length A | 17.3 to 17.7 mm (0.682 to 0.696 in.) | p. 390 |
| B2320DT, B2620HSD | ||
| Engine Crankcase Capacity (with filter) | 3.1 L | p. 9 |
| B2320DT | ||
| Transmission Case Capacity | 14 L | p. 9 |
| B2320 | ||
| Overall Length (without 3P) | 2385 mm | p. 9 |
Kubota B2320, B2620, B2920 Common Problems This Manual Covers
Cranks but will not start
A tractor that spins over but will not fire, even with a charged battery, is commonly a seat, PTO, or range/neutral safety switch fault or a wiring problem in the start circuit. The electrical section documents the starting and stopping system and the safety switch conditions.
Manual Section: Sect 9 ElectricalHST pedal creeps or will not return
An HST pedal that does not return fully to neutral makes the tractor creep or hard to control, usually from linkage adjustment, wear, or contamination. The transmission section covers the hydrostatic transmission structure and its control.
Manual Section: Sect 3 Transmission3-point hitch drifts down when parked
A hitch that slowly settles under load or when parked is a recurring hydraulic complaint tied to internal leakage, worn control valves, or seal wear in the lift circuit. The hydraulic section covers the control valve assembly and the three point hydraulic system.
Manual Section: Sect 8 HydraulicLoose or under-torqued wheel bolts
Wheel nuts that back off cause wobble and uneven wear. The tightening torques section lists the fastener values, including the general use bolt torque of 48 to 55 N·m for an M10 property class 8.8 bolt, so the wheels and hardware are set correctly.
Manual Section: Tightening Torques p. 25Overheating during heavy work
Overheating while mowing or under load often traces to a restricted radiator screen, dirty air intake, low coolant, or a cooling maintenance lapse. The check and maintenance section lists the daily and interval checks that keep the cooling system clear.
Manual Section: Check And Maintenance p. 29Weak loader or hydraulic performance
Slow or weak loader and 3-point operation is commonly low hydraulic fluid, clogged filters, contaminated oil, or a suction-side air leak. The hydraulic section covers the hydraulic circuit, pump, and control valve assembly used across these models.
Manual Section: Sect 8 HydraulicFrequently Asked Questions
Which tractors does this service manual cover?
It covers the Kubota B2320, B2620, and B2920 compact tractors in both hydrostatic and manual transmission versions, with the D1005-E3-D22, D1105-E3-D22, and D1305-E3-D22 engines.
Does it list tightening torque specifications?
Yes. The tightening torques section gives the general use screw, bolt, and nut values, including 48 to 55 N·m for an M10 property class 8.8 bolt, plus stud bolt, metric, and American standard tables. p. 25
Can I use it to diagnose a safety-switch no-start?
Yes. The electrical section documents the engine starting and stopping system and the safety switch conditions, including the seat, PTO, and main shift switch resistance values used to test them.
Are the maintenance schedules included?
Yes. The check and maintenance section lays out the daily check and the interval checks at 50, 100, 200, 400, and 800 hours and beyond so you can plan service. p. 29
How will I receive this Kubota B2320 Service Manual?
A 406-page service manual in searchable PDF, ready the moment your checkout completes. Open it on a computer, tablet, or phone with no shipping wait.
Can I print specific sections of this Kubota B2320 Service Manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Are there wiring harness diagrams in this Kubota B2320 manual?
Complete wiring diagrams are included, covering all electrical circuits, harness routing, and connector pinouts for the Kubota B2320, B2620, B2920.
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