Kubota B2650HSDC User Manual (English)

Questions and Answers:

C
chandlerjoyceAug 21, 2025
Why is my Kubota B2650HSDC emitting black exhaust gas?
- H
  hsmithAug 21, 2025
  If you observe black or dark gray exhaust gas from your Kubota Tractor, it could be due to several reasons. The issue might stem from using low-grade fuel, which means you should switch to the specified fuel. A clogged fuel filter or air cleaner could also be responsible; in this case, replace the fuel filter or clean/replace the air cleaner. Additionally, deficient nozzle injection could be the cause, requiring you to repair or replace the nozzle.
A
Antonio MoralesAug 23, 2025
Why is my Kubota B2650HSDC Tractor engine overheating?
- M
  Michael WellsAug 23, 2025
  If your Kubota Tractor's engine is overheating, there are several possible causes. Check if the engine oil or coolant levels are insufficient and fill if needed. The radiator net and fin might be clogged with dust, requiring cleaning. Corrosion inside the radiator or coolant flow route could also be the issue, in which case you should clean or replace the affected parts. Other potential causes include a damaged radiator cap or hose (replace), incorrect injection timing (adjust), or unsuitable fuel (use specified fuel).
L
Lori KingAug 26, 2025
Why is the engine revolution not smooth on my Kubota Tractor?
- K
  Kristen AllenAug 26, 2025
  If your Kubota Tractor's engine revolution is not smooth, several issues could be responsible. A clogged or dirty fuel filter could be the cause, requiring a replacement. Similarly, a clogged air cleaner can lead to this problem, so you should clean or replace it. Other potential issues include a malfunctioning injection pump (repair or replace), incorrect nozzle injection pressure (adjust), a stuck or clogged injection nozzle (repair or replace), a malfunctioning solenoid or rack sensor (replace), or worn or damaged turbocharger components (replace the turbocharger assembly).
A
adrian49Aug 27, 2025
What to do if the starter does not run on my Kubota B2650HSDC Tractor?
- J
  Jacob RichardsonAug 28, 2025
  If the starter on your Kubota Tractor does not run, it could be due to a discharged battery, which requires charging. Alternatively, the starter itself may be malfunctioning, necessitating repair or replacement. A malfunctioning key switch or disconnected wiring could also be the cause, requiring replacement of the key switch or reconnection of the wiring.
J
Janice EvansAug 29, 2025
Why is my Kubota B2650HSDC emitting white or blue exhaust gas?
- M
  Melissa WilliamsAug 30, 2025
  If you notice either white or blue exhaust gas coming from your Kubota Tractor, it could be due to several reasons. Excessive engine oil may be the cause, requiring you to reduce it to the specified level. Alternatively, worn or stuck piston rings and cylinders could be responsible, necessitating repair or replacement. Incorrect injection timing or deficient compression can also lead to this issue; adjust the timing or repair the compression accordingly.
A
Amanda WallSep 1, 2025
What to do if my Kubota Tractor has deficient output?
- D
  david62Sep 1, 2025
  If your Kubota Tractor is experiencing deficient output, several factors could be contributing. These include incorrect injection timing, which requires adjustment, a malfunctioning injection pump, which needs repair or replacement, or uneven fuel injection, which may necessitate replacing the injection pump. Other potential causes involve deficient nozzle injection (repair or replace nozzle), compression leak (check the compression pressure and repair), gas leak from exhaust system or air leak from compressor discharge side (repair or replace), a dirty or clogged air cleaner (clean or replace), or a compressor wheel turning heavily (replace the turbocharger assembly).
J
John EvansSep 3, 2025
What causes excessive lubricant oil consumption in a Kubota B2650HSDC?
- A
  Ashley EllisSep 3, 2025
  If your Kubota Tractor is experiencing excessive lubricant oil consumption, several factors could be at play. The piston ring gaps might be facing the same direction, requiring you to shift the ring gap direction. Additionally, a worn or stuck oil ring, a worn piston ring groove, worn valve stems and valve guides, or worn crankshaft and crank pin bearings could be the cause, necessitating replacement of the respective components.
J
jblairSep 5, 2025
Why is there an oil leak into the exhaust pipe of my Kubota B2650HSDC?
- M
  Matthew GraySep 5, 2025
  If you find oil leaking into the exhaust or suction pipe of your Kubota Tractor, it could be due to a clogged or deformed waste oil pipe, which requires repair or replacement. Another potential cause is a faulty piston ring seal, which requires replacing the turbocharger assembly.
N
Nathan SchwartzSep 7, 2025
Why is fuel mixing into the lubricant oil in my Kubota B2650HSDC Tractor?
- V
  Vincent RiggsSep 7, 2025
  If fuel is mixed into the lubricant oil of your Kubota Tractor, it could be caused by a worn or broken injection pump plunger or a broken injection pump. In either case, you should repair or replace the injection pump.
S
Stephanie BrooksSep 9, 2025
What causes water to mix into the lubricant oil of a Kubota B2650HSDC Tractor?
- J
  Jack ColemanSep 9, 2025
  If water is mixed into the lubricant oil of your Kubota Tractor, it could be due to a damaged head gasket or a flawed cylinder block or cylinder head. In either case, you should replace the affected component.

Kubota B2650HSDC Specifications

General

Engine Type	Diesel
Engine Cycle	4-cycle
Transmission Type	Hydrostatic
Drive	4WD
Hydraulic System Type	Open center
3-Point Hitch Category	Category I
Type	Compact Utility Tractor
Tire Size (Rear)	12.4-16
Number of Gears	3 ranges (High, Medium, Low)

Summary

TO THE READER

Record of Revisions

INFORMATION

SAFETY FIRST

BEFORE YOU START SERVICE

Essential steps to take before starting any service on the machine.

START SAFELY

Crucial safety procedures for starting the engine and operating the machine.

SAFETY DECALS

SPECIFICATIONS

TRAVELING SPEEDS

DIMENSIONS

GENERAL

TRACTOR IDENTIFICATION

MODEL NAME AND SERIAL NUMBER

Details for identifying the tractor's model and serial number.

CYLINDER NUMBER

Designation of cylinder numbers for the KUBOTA diesel engine.

GENERAL PRECAUTIONS

HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING

WIRING

Guidelines for securely handling and installing electrical wiring.

BATTERY

Precautions for handling and servicing the battery.

FUSE

Guidelines for using and replacing fuses.

CONNECTOR

Instructions for connecting and disconnecting electrical connectors.

COLOR OF WIRING

LUBRICANTS, FUEL AND COOLANT

TIGHTENING TORQUES

GENERAL USE SCREWS, BOLTS AND NUTS

Tightening torques for standard screws, bolts, and nuts.

STUD BOLTS

Tightening torques specific to stud bolts.

METRIC SCREWS, BOLTS AND NUTS

Tightening torques for metric fasteners.

AMERICAN STANDARD SCREWS, BOLTS AND NUTS WITH UNC OR UNF THREADS

Tightening torques for American standard fasteners.

PLUGS

Tightening torques for various plugs.

MAINTENANCE CHECK LIST

CHECK AND MAINTENANCE

DAILY CHECK

Essential checks to perform on a daily basis.

CHECK POINTS OF INITIAL 50 HOURS

Maintenance checks required after the first 50 hours of operation.

CHECK POINTS OF EVERY 50 HOURS

Regular maintenance checks at 50-hour intervals.

CHECK POINTS OF EVERY 100 HOURS

Regular maintenance checks at 100-hour intervals.

CHECK POINTS OF EVERY 200 HOURS

Regular maintenance checks at 200-hour intervals.

CHECK POINTS OF EVERY 300 HOURS

Regular maintenance checks at 300-hour intervals.

CHECK POINTS OF EVERY 400 HOURS

Regular maintenance checks at 400-hour intervals.

CHECK POINT OF EVERY 800 HOURS

Maintenance check at 800-hour intervals.

CHECK POINT OF EVERY 1500 HOURS

Maintenance check at 1500-hour intervals.

CHECK POINT OF EVERY 3000 HOURS

Maintenance check at 3000-hour intervals.

CHECK POINTS OF EVERY 1 YEAR

Important annual maintenance tasks.

CHECK POINTS OF EVERY 2 YEARS

Important bi-annual maintenance tasks.

OTHERS

Miscellaneous maintenance items and procedures.

TIRES

TIRE PRESSURE

Guidelines for maintaining correct tire pressure.

TREAD ADJUSTMENT

Procedures for adjusting tire tread width.

BALLAST

Information on adding ballast for stability and traction.

TIRE LIQUID INJECTION

Procedure for injecting liquid ballast into tires.

IMPLEMENT LIMITATIONS

ENGINE

ENGINE BODY

Description of the main engine structure and components.

REFORMER AND AFTER TREATMENT DEVICES

Details on the reformer and after-treatment emission control systems.

DPF REGENERATION SYSTEM

Information on the Diesel Particulate Filter regeneration process.

SERVICING

TROUBLESHOOTING

Common issues and their solutions for the tractor.

SERVICING SPECIFICATIONS

Technical specifications for engine components.

TIGHTENING TORQUES

Specified torques for various screws, bolts, and nuts.

CHECKING, DISASSEMBLING AND SERVICING

Procedures for checking, disassembling, and servicing components.

TRANSMISSION

STRUCTURE

Overview of the transmission assembly.

FRONT CASE

Details of the front case assembly.

HYDROSTATIC TRANSMISSION

Explanation of the hydrostatic transmission system.

CRUISE CONTROL

Information on the cruise control system and its linkage.

RANGE GEAR SHIFT SECTION

Description of the range gear shifting mechanism.

FRONT WHEEL DRIVE SECTION

Details of the front wheel drive system.

PTO SYSTEM

Overview of the Power Take-Off system.

DIFFERENTIAL GEAR SYSTEM

Explanation of the differential gear system and its function.

TRANSMISSION CASE AND DIFFERENTIAL GEAR

TIGHTENING TORQUES

CHECKING, DISASSEMBLING AND SERVICING

CHECKING AND ADJUSTING

Procedures for checking and adjusting system components.

PREPARATION

Steps required before disassembling or servicing components.

DISASSEMBLING AND ASSEMBLING

Procedures for disassembling and assembling transmission parts.

REAR AXLE

STRUCTURE

Overview of the rear axle structure.

TROUBLESHOOTING

Common issues and solutions related to the rear axle.

TIGHTENING TORQUES

Specified torques for rear axle components.

DISASSEMBLING AND SERVICING

Procedures for servicing the rear axle assembly.

BRAKES

LINKAGE

Description of the brake system's mechanical linkage.

OPERATION

How the brake system functions during operation.

SERVICING

Procedures for servicing the brake system.

TROUBLESHOOTING

Common brake system issues and their solutions.

SERVICING SPECIFICATIONS

Key specifications for brake system components.

TIGHTENING TORQUES

Specified torques for brake system fasteners.

CHECKING, DISASSEMBLING AND SERVICING

Procedures for checking and servicing brake components.

FRONT AXLE

STRUCTURE

Overview of the front axle structure.

TROUBLESHOOTING

Common issues and solutions for the front axle system.

SERVICING SPECIFICATIONS

Technical specifications for front axle components.

TIGHTENING TORQUES

Specified torques for front axle fasteners.

CHECKING, DISASSEMBLING AND SERVICING

Procedures for checking and servicing front axle components.

STEERING

HYDRAULIC CIRCUIT

Diagram and explanation of the hydraulic steering system circuit.

STEERING CONTROLLER

Description of the steering control valve and metering device.

STEERING CYLINDER

Details on the single piston, double-acting steering cylinder.

HYDRAULIC PUMP

Information on the hydraulic pump for power steering.

SERVICING

Procedures for servicing the hydraulic and steering systems.

TROUBLESHOOTING

Common steering system issues and their solutions.

SERVICING SPECIFICATIONS

Technical specifications for steering components.

TIGHTENING TORQUES

Specified torques for steering system fasteners.

CHECKING, DISASSEMBLING AND SERVICING

Procedures for checking and servicing steering components.

HYDRAULIC SYSTEM

HYDRAULIC CIRCUIT

Diagram and explanation of the main hydraulic circuit.

HYDRAULIC PUMP

Details on the hydraulic pump specifications.

THREE POINTS HYDRAULIC SYSTEM

Explanation of the 3-point hitch hydraulic system.

TROUBLESHOOTING

Common hydraulic system issues and their solutions.

SERVICING SPECIFICATIONS

Specifications for hydraulic system components.

TIGHTENING TORQUES

Specified torques for hydraulic system fasteners.

CHECKING, DISASSEMBLING AND SERVICING

Procedures for servicing hydraulic system components.

ELECTRICAL SYSTEM

ELECTRICAL CIRCUIT

Diagrams of the electrical circuits for different models.

ENGINE STARTING SYSTEM AND STOPPING SYSTEM

Explanation of the engine starting and stopping system.

SAFETY SWITCH

Details on various safety switches and their continuity checks.

LIGHTING SYSTEM

Information on the tractor's lighting systems.

EASY CHECKER™

Explanation of the Easy Checker system and its indication items.

DIGITAL DISPLAY

Information on the digital display and its indicators.

TROUBLESHOOTING

Troubleshooting common electrical system issues.

SERVICING SPECIFICATIONS

Specifications for electrical system components like starter and alternator.

TIGHTENING TORQUES

Specified torques for electrical system fasteners.

CHECKING AND ADJUSTING

Procedures for checking and adjusting electrical components.

CABIN

AIR CONDITIONER SYSTEM

Overview of the air conditioner system components.

REFRIGERATION SYSTEM

Details on the refrigeration system, including the compressor.

SERVICING SPECIFICATIONS

Specifications for cabin components like AC system.

TIGHTENING TORQUES

Specified torques for cabin component fasteners.

PRECAUTIONS AT REPAIRING REFRIGERANT CYCLE

Safety precautions for working with the refrigerant cycle.

CHECKING AND CHARGING REFRIGERANT CYCLE

Procedures for checking and charging the refrigerant system.

CHECKING, DISASSEMBLING AND SERVICING

Procedures for servicing cabin components.

ENGINE

ENGINE BODY

Description of the main engine structure and components.

REFORMER AND AFTER TREATMENT DEVICES

Details on the reformer and after-treatment emission control systems.

DPF REGENERATION SYSTEM

Information on the Diesel Particulate Filter regeneration process.

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30 pages

Kubota B2650HSDC User Manual

Table of Contents

Questions and Answers:

Kubota B2650HSDC Specifications

Summary

TO THE READER

Record of Revisions

INFORMATION

SAFETY FIRST

BEFORE YOU START SERVICE

START SAFELY

SAFETY DECALS

SPECIFICATIONS

TRAVELING SPEEDS

DIMENSIONS

GENERAL

TRACTOR IDENTIFICATION

MODEL NAME AND SERIAL NUMBER

CYLINDER NUMBER

GENERAL PRECAUTIONS

HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING

WIRING

BATTERY

FUSE

CONNECTOR

COLOR OF WIRING

LUBRICANTS, FUEL AND COOLANT

TIGHTENING TORQUES

GENERAL USE SCREWS, BOLTS AND NUTS

STUD BOLTS

METRIC SCREWS, BOLTS AND NUTS

AMERICAN STANDARD SCREWS, BOLTS AND NUTS WITH UNC OR UNF THREADS

PLUGS

MAINTENANCE CHECK LIST

CHECK AND MAINTENANCE

DAILY CHECK

CHECK POINTS OF INITIAL 50 HOURS

CHECK POINTS OF EVERY 50 HOURS

CHECK POINTS OF EVERY 100 HOURS

CHECK POINTS OF EVERY 200 HOURS

CHECK POINTS OF EVERY 300 HOURS

CHECK POINTS OF EVERY 400 HOURS

CHECK POINT OF EVERY 800 HOURS

CHECK POINT OF EVERY 1500 HOURS

CHECK POINT OF EVERY 3000 HOURS

CHECK POINTS OF EVERY 1 YEAR

CHECK POINTS OF EVERY 2 YEARS

OTHERS

TIRES

TIRE PRESSURE

TREAD ADJUSTMENT

BALLAST

TIRE LIQUID INJECTION

IMPLEMENT LIMITATIONS

ENGINE

ENGINE BODY

REFORMER AND AFTER TREATMENT DEVICES

DPF REGENERATION SYSTEM

SERVICING

TROUBLESHOOTING

SERVICING SPECIFICATIONS

TIGHTENING TORQUES

CHECKING, DISASSEMBLING AND SERVICING

TRANSMISSION

STRUCTURE

FRONT CASE

HYDROSTATIC TRANSMISSION

CRUISE CONTROL

RANGE GEAR SHIFT SECTION

FRONT WHEEL DRIVE SECTION

PTO SYSTEM

DIFFERENTIAL GEAR SYSTEM

TRANSMISSION CASE AND DIFFERENTIAL GEAR

TIGHTENING TORQUES

CHECKING, DISASSEMBLING AND SERVICING

CHECKING AND ADJUSTING

PREPARATION

DISASSEMBLING AND ASSEMBLING

REAR AXLE

STRUCTURE