Kubota V2003 Parts – New and Aftermarket

The Kubota V2003 engine is a vertical, liquid cooled, 4 stroke, 4 cylinder diesel engine, with a displacement of 122 cu in.  It has a gross power ouput of 43.7 hp, and a net of 41.3 hp, with a maximum speed of 3020 rpm. Its dimensions are : length 25.7 in, width 18.9 in, height 25.3 in,, with a net weight of approx 397 lbs.

The main parts of the V2003 engine that may need replacing at some time are listed below. They may need replacing either through some type of mechanical breakdown or damage, or simply as part of routine maintenance over a period of time.

With all Kubota Engines it is important to check what emission regulation thet comply with, normally either Tier 4 or Tier 2. It is also important to check its intake system – many are naturally aspirated.

Parts can normally be obtained either from Kubota itself, or from a third party supplier.

Kubota engines can be used in many different types of machinery and vehicles, ranging from tractors to air compressors, excavators, saw mills, water pumps, zero turn mowers, sea weed harvesters, trenchers, wheel loaders, generators etc.

Many of them are also compatable with tractors and machinery made by other manufacturers.

The Kubota V2003 engine is one of the most powerful engines Kubota has ever built, and has a strong reputation for both its power and effeciency.

Replacement parts made by another manufacturer are normally referred to as aftermarket parts. Aftermarket parts should perform the same function as a standard manufacturer part, but will normally be cheaper.

If the Kubota V2003 is still under warranty, then it is likely to be part of the warranty conditions that manufacturer parts are used. A number of people also prefer manufacturer parts because there are specifically designed to be used with the appropriate tractor.

Below is a breakdown of the main areas and categories of parts used in most Kubota engines, tractors and agricultural machinery. It is really important to check the specific item needed prior to purchase, especially if bought online

All measurements listed below are approximate and should be checked with the manufacturer /dealer or manual before any purchase is made or any repairs undertaken.

Kubota V2003 Manual PDF

The operator and service manual for the Kubota V2003, sometimes referred to as a workshop manual is most easily accessed as a PDF document, and can be downloaded either from the main Kubota website, or from a number of other websites online, either as a free download or normally at a minimal cost

The manual is a crucial document in terms of advising both how to disassemble and service the engine in a safe and efficient way, and at the same time keeping all its operating parts running smoothly and effectively as possible

The Kubota parts diagrams that are part of the manual are important in helping anyone to fit or repair a replacement part, either as part of a routine service, or because the part has become defective.

The Kubota V2003 PDF manual has a number of sections, which would normally cover the mechanism and servicing and disassembling areas of operation.


Engine Body

  • cylinder block
  • cylinder head
  • crankshaft
  • system and piston rings
  • connecting rod
  • camshaft
  • flywheel
  • rocker arm

Lubricating System

  • general
  • oil pump
  • relief valve
  • oil filter cartridge
  • oil pressure switch

Cooling System

  • general
  • waterpump
  • thermostat
  • radiator
  • radiator cap

Intake/Exhaust system

  • air cleaner
  • muffler

Fuel system

  • general
  • injection pump
  • injection nozzle
  • fuel filter
  • fuel lift pump
  • governor

Electrical system

  • electrical charging system

Disassembling and Servicing


  • engine identification
  • general precautions
  • tightening torques
  • troubleshooting
  • servicing specifications
  • maintenance checklist
  • check and maintenance
  • special tools

Engine Body

  • checking and adjusting
  • disassembling and assembling
  • draining water and oil
  • external components
  • cylinder head and fouls
  • gear case
  • piston and connecting rod
  • flywheel and crankshaft servicing
  • cylinder head
  • climbing gear and camshaft
  • piston and connecting rod
  • crankshaft
  • cylinder bore

Lubricating System

  • checking
  • servicing
  • oil pump

Cooling System

  • checking
  • fan belt
  • radiator
  • dassembling and assembling

Fuel system

  • checking and adjusting
  • injection pump
  • injection nozzle
  • disassembling and assembling
  • injection pump
  • injection nozzle

Electrical system

  • checking
  • starter
  • glow plug
  • alternator and regulator
  • disassembling and asessembling
  • starter
  • alternator
  • servicing
  • starter
  • alternator

It is always a good idea to do a pre-operation check, to see if there are any signs of problems that could indicate parts needing to be replaced. Some inspections include checking to see if there are any parts which have had problems in previous operations.

Walk around the engine to see if there are any oil or water leaks, checking the engine oil level and the amount of fuel. Check the amount of coolant in the engine and seeing if there is any dust in the air cleaner dust cup. It is also a good idea to check if there are any damaged parts or any loosened bolts or nuts.

When starting the engine, it is a good idea to check the colour of the exhaust fumes, and listen to see if there is any unusual engine noise which could give an indication of some malfunction inside it.

Kubota also give a detailed breakdown how often various parts should be checked to see if they need replacing or cleaning. This is indicated by how many hours the engine has been running for. As an example, for most engines it is recommended that every 200 hours the engine oil is changed, and the intake airline is checked.

Every 3000 hours, it is recommended to check the turbocharger, check the injection pump and check the fuel injection timer.Every two years it is recommended to change the radiator coolant, to change or replace radiator hoses and clamp bands, to replace fuel pipes and replace the intake air line.

For full details please refer to the service owners manual.

The Kubota engine V2003 series repairs, servicing and maintenance are often done in collaboration with different Kubota tractors, whose main parts are listed below.

Kubota V2003 Engine Parts

Intake manifold

Speed control lever

Engine stop lever

Injection pump

Fuel feed pump

Cooling fan

Fan drive pulley

Oil filter cartridge

Water drain cock

Oil filter plug

Exhaust manifold



Oil level gauge

Oil pressure switch


Oil drain plug

Oil pan

Kubota V2003 Parts – Injection Pump

This engine has a unique injection system pioneered by Kubota. What it does in effect is to provide a high level of power output, that is combined with a torque backup.

In addition, the way the pistons are designed and coated means that the valves vibrate less than in a lot of comparable diesel engines, meaning  that there is generally much less noise from the engine that would otherwise be.

The issue of noise can be a significant factor in any engine that is running for a long period of time continuously, especially if it is in a confined area.

The Kubota V2003 uses a unique casting technology made by Kubota that gives the engine a high level of protection against the heat generated by the power of the engine.

This gives the engine an increased level of reliability, as well as high level of endurance.

Its design also gives it a way of starting quickly in cold weather, which is not only convenient, but in many ways can also be hugely beneficial in terms of productivity and work performance..

Kubota V2003 specs and parts

It is important to check the specification of the V2003 engine before underatking any work on it – the main areas to look  at are listed below

Number of cylinders


Combustion System

Intake system

Cooling System

Dry Weight



Starting System

Various options such as shallow oil pan and horizontal water outlet are available to reduce engine height.

Kubota V2003 – Main Compnents and Parts









Oil pump


Intake manifold

Oil pan

Tractor / Engine Parts

As above, Kubota engines are used in a wide range of machinery and equipment, and parts are often used in conjunction with other repair or servicing work. Listed below are some of the main types of other Kubota parts used.

Kubota V2003 parts  – 3 Point Linkage / Drawbar/ Hitch –

  • Lift Rod  LH
  • Lift Rod  RH
  • Lower link
  • PTO shaft protector
  • Stabiliser
  • Swinging drawbar
  • Top link
  • Top link bracket

Kubota V2003 parts – Air Conditioner

  • Air conditioning duct
  • Air conditioner hose
  • Compressor
  • Condenser
  • Dashboard air outlets
  • Heater hose
  • Inner air recirculation
  • Mode case

Kubota Accessories and Service parts

Brake parts

  • Brake
  • Brake pedal
  • Brake rod
  • Parking brake lever

Cabin Parts

  • Cab Bracket front
  • Cab Bracket rear
  • Cab Frame
  • Door LH
  • Doorlock LH
  • Door lock RH
  • Sender
  • Fender cover
  • Floor mat
  • Front glass
  • Hood rear
  • Inner  roof
  • Near window
  • Rear view mirror
  • Seat
  • Side window
  • Toolbox


Cargo and Storage Accessories

Chassis parts

Clutch parts

  • Center frame
  • Bevel gear
  • Clutch release fork
  • Clutch rod
  • Differential rear
  • Driveshaft
  • First shaft
  • Input shaft
  • PTO clutch
  • PTO clutch valve
  • PTO propellor shaft
  • PTO shaft
  • Rear axle case
  • Second shaft
  • Shift cover
  • Shuttle dear case
  • Shuttle shaft
  • Transmission case
  • Clutch
  • Clutch lever
  • Clutch pedal
  • Clutch housing

Cooling System parts

  • Radiator
  • Shutter
  • Fan
  • Reserve tank
  • Water pipe

Cylinder Head

Kubota V2003 Parts – Electrical System

  • Battery
  • Alternator
  • Dynamo
  • Dynamo and van
  • Light
  • Regulator and meter
  • Electrical wiring
  • Hazard light/tail light touch
  • Head light
  • Panel board/switch
  • Starter
  • Switch
  • Stop solenoid
  • Tail light
  • Working light
  • Switch/sensor

Kubota V2003 Parts – Engine

  • Accelerator lever
  • Air cleaner
  • Alternator
  • Camshaft and idle gear shaft
  • Cover
  • Crankcase
  • Cylinder head
  • Dipstick and guide
  • Exhaust manifold
  • Fan
  • Flywheel
  • Fuel camshaft
  • Gear case
  • Governor
  • Head cover
  • Idle apparatus
  • Injection pump
  • Inlet manifold
  • Lower gasket kit
  • Main bearing case
  • Muffler
  • Nozzle holder
  • Oil filter
  • Oil pump
  • Oil switch/thermometer
  • Piston and crankshaft
  • Speed control plate
  • Starter
  • Stop solenoid
  • Kubota kit
  • Valve and rocker arm
  • Water flange and thermostat
  • Water pump

Kubota V2003 Filters and Maintenance

Frame Parts

Front axle parts

  • Differential gear shaft
  • Bevel gear case
  • Knuckle shaft
  • Engine support
  • Front axle
  • Front axle case
  • Front differential
  • Front differential case
  • Front drive shaft
  • Front frame
  • Subframe

Kubota V2003 Parts – Fuel Sytem

  • Fuel pipe
  • Fuel filler
  • Sedimenter
  • Separator
  • Fuel filter
  • Fuel tank

Hood / Bonnet – ROPS Parts

  • Bonnet
  • Bonnet side
  • Center pillar
  • Floor sheet
  • Main frame
  • Shutter plate
  • Side cover
  • Fender
  • Front grille support
  • Lever guide
  • Manual holder
  • Panel frame
  • ROPS
  • Seat
  • Street support
  • Step
  • Step stay

Hitch and Drawbar

  • Drawbar and hitch
  • PTO shaft protector

Hydraulic system parts

  • 3 point linkage
  • Control valve
  • Cylinder front cover
  • Draft control valve
  • Feedback lever
  • Hydraulic oil line
  • Hydraulic cylinder
  • Hydraulic pump
  • Lift arm
  • Position control lever
  • Top link bracket

Ignition Parts

Paint and Trim Parts

Pump Motor System

  • Control valve
  • 3 point linkage
  • Feedback lever
  • Oil tank
  • Position control lever
  • PTO valve
  • Safety valve
  • Hydraulic control lever
  • Hydraulic cylinder
  • Hydraulic oil line/delivery
  • Hydraulic line/steering
  • Hydraulic piston/lift arm
  • Hydraulic pump
  • Hydraulic pump/component parts

Rear axle parts

  • Differential lock pedal
  • Rear axle
  • Rear differential
  • Rear wheel
  • Spiral bevel pinion

Rear PTO parts

Section part

Speed Change Lever

  • Differential lock shift fork
  • Frontwheel drive lever
  • Main gear shift fork
  • Main gear shift lever
  • PTO gear shift arm
  • PTO gear shift fork
  • PTO gear shift lever
  • PTO select lever
  • Range gear shift fork
  • Range gear shift lever
  • Speed control pedal

Steering parts

  • Steering controller
  • Steering cylinder/component parts
  • Steering handle
  • Manual steering
  • Steering linkage
  • Steering post
  • Tilt pedal

Top Link / Top Link Bracket / PTO Protector

  • Lift Rod
  • 3 point linkage
  • Check chain
  • Hitch
  • Lower link
  • Mower rear link LH
  • Mower rear link RH
  • PTO protector
  • Top link
  • Top link bracket
  • Toys and Merchandise

Kubota V2003 Parts – Transmission

  • Clutch shaft/output shaft
  • Front wheel propeller shaft
  • Countershaft
  • Main shaft
  • PTO counter shaft
  • Reverse shaft
  • Forward idle shaft
  • GP idle shaft
  • HST one – cylinder block
  • HST two/arm
  • HST 3/port block cover
  • HST 4/oil cooler cover
  • HST fan cover
  • Mid PTO
  • Propeller shaft
  • PTO shaft
  • Rear gear shaft
  • Rear axle case
  • Rear differential
  • Transmission case

Kubota V2003 Parts – Filters and maintenance

  • Air filter
  • Engine oil filter
  • Extended life antifreeze/coolant
  • Filter maintenance kit
  • Fuel filter – in line
  • High-performance agricultural/construction equipment grease
  • Hydraulic oil filter
  • Hydraulic suction oil filter
  • Lever action grease gun
  • Engine oil
  • Gear lubricant
  • Synthetic universal hydraulic fluid

Kubota V2003 Parts – Cylinder head and Related Components

  • Complete cylinder head
  • Exhaust valve guide
  • Inlet valve guide

Kubota V2003 Parts -Transmission

  • HST Damper
  • Universal joint assembly

Kubota V2003 Parts – Electrical

  • Alternator
  • Fuel shutoff solenoid
  • Hazard lamp
  • Headlight assembly
  • Headlight lens
  • Keys
  • Kubota battery
  • Oil pressure switch
  • Re-manufactured starter
  • Safety switch, seat
  • Starter assembly
  • Starter switch and keys
  • Tail lamp
  • Timer relay
  • Turn Signal Lamp

Kubota V2003 Parts – Engine gaskets and gasket kits

  • Gasket kit – upper

Kubota V2003 Parts – Mower Deck

  • Dial Cam

Kubota V2003 Parts – Exhaust system parts

  • Exhaust manifold
  • Exhaust manifold gasket

Kubota V2003  Parts –  Cooling System

  • Cooling fan
  • Fan belt
  • Lower radiator hose
  • Radiator
  • Radiator screen
  • Thermostat
  • Apart radiator hose
  • Water pump
  • Water pump gasket

Kubota V2003 Parts – Fuel System

  • Fuel cap – gasoline
  • Fuel shutoff solenoid
  • Re-manufactured injection pump

Kubota V2003 – Lubrication Systems

  • Oil pump
  • Oil pump gaskets


Kubota V2003 Parts,

Kubota V2003 Parts Manual PDF,

Kubota V2003 Engine Parts,

Kubota V2003 Engine Specs,

Kubota V2003 Turbo,

Kubota V2003 Oil Capacity,

Kubota V2003 Injection Pump,

Kubota V2003 Transmission,

Kubota V2003 Engine Rebuild Kit,