KUBOTA MINI EXCAVATOR

Introducing the KX121-3αfrom the recognized leaderin mini excavators. Performance designed to handleall your professional needs.

New load sensing hydraulic systemKubota introduces an advancedhydraulic system that gives a bettereffect on operation feeling and less fuelconsumption. With this new load sensingsystem, the hydraulic oil flow is suppliedfrom only one variable displacementpump. The load information on eachactuator is fed back to the pump at alltimes and the pump distributes theappropriate oil flow to each actuatoraccording to the amount of lever stroke.As a result, regardless of different loadsituations, equal movement to thehydraulic cylinder is achieved relative tothe lever stroke. This makes work suchas lifting and levelling much smoother. Inaddition, when the operation control leveris in the neutral position, the pump stopssupplying unnecessary oil flow. Thismeans the pump only supplies requiredoil flow. Thus, unnecessary energy wasteis minimised due to eliminating excessiveoil return flow to the hydraulic tank withthis load sensing hydraulic system.Compared to conventional models,about 20 % of fuel can be saved carryingout similar jobs.

Enhanced digging forceA well-balanced arm and bucket providesan operator efficient digging force. Inaddition, by setting the maximum operatingpressure at 24.5 MPa, each digging forcehas been enhanced by15 % in order toincrease speed of even tough digging jobs.

Adjustable maximum oil flow on auxiliary circuitThe maximum oil flow rate of the auxiliary circuit can bechanged/adjusted by simply pushing a switch—there’sno need for additional tools. This simplifies the utilisationof front attachments like tiltbuckets, brush cutters andhydraulic hammers—you canreduce or increase the flow to getjust the right amount of control. *The maximum oil flow can vary accordingto the load of front attachments.

Four simultaneous operationsWhen simultaneous operation of the boom,arm, bucket, and swing is required such aswhen loading on to trucks or lifting, the pumpdistributes adequate oil flow to each actuatoraccording to the amount of lever strokewithout loss of speed or power, ensuring highperformance digging and dozing at all times.

Third line hydraulic returnThe Third Line HydraulicReturn enables greater oilflow efficiency by reducingback pressure when workingwith hydraulically actuatedattachments, such as ahydraulic hammer.

ROPS/FOPS cabin (Level1)The cabin offers maximumoperator safety with its RollOver Protection Structure(ROPS) and Falling ObjectProtection Structure (FOPS).

Control leversAdequate lever stroke andergonomically-designed wristrests provide greater controlability, smoother operation andreduces operator fatigue.

Straight travelThe New Hydraulic MatchingSystem (New-HMS) ensuresstraight travel even withsimultaneous operation of anyother circuit for safer loading/offloading and easier de-bogging.

Air conditioning (Optional)The cab's new optional deluxeair conditioning/heater canincrease cooling, heating andair ventilation for greaterclimate control. Plus, outsideair can be introduced with onetouch of the external air vent.

Boom cylinder protectorThe new, thicker steel plated V-shaped boom cylinder protectorsafeguards against damage fromattachments, rocks or loading.

The KX121-3α. Built to take excavator comfort,convenience and performance to new heights.

Informative, interactive and functional. Kubota's IntelligentControl System keeps you in tune of the KX121-3α’s vitalsigns. It accurately displays easy to understand diagnosticsof current working conditions and warning indicators forengine rpm and hour meter, as well as for fuel, temperatureand oil levels. When filling-up with fuel, our panel alsoinforms the operator that the tank is nearly full, plus alertsthe operator to when routine maintenance is due. Overall,the panel reduces excavator downtime and repair fees for adecrease in total operating costs.

Information when service time comes Low fuel displayLanguage selection display

Function

If control levers are left neutral for

more than 4 seconds

Engine rpm is reset promptly

to the dial-set rpm

Engine rpm is reduced automatically

to idling rpm

When levers are moved

again...

Auto Idling System (AI)When high engine rpm is not needed, orwhen control levers are left in neutral forlonger than 4 seconds, the idling systemautomatically reduces the engine toidling rpm. When the levers are movedagain, engine rpm is promptly reset tothe dial-set rpm. This innovative featurenot only reduces noise and exhaustemissions, but saves on fuel, energy andrunning costs as well.

Constant oil flow switchAny attachment thatrequires a constant oil flow,this ON/OFF press switchenables a simple operation.

Proportional flowauxiliary switchRepositioned from the floor, a convenient thumb-operatedswitch enables easy operationof auxiliary equipment, suchas the auger and tilt bucket.

2--speed switchConveniently mounted on thedozer lever, the repositioned 2-Speed Travel Switch allowsadvanced user-friendly travelspeed changes, increasedfloor space, improvedoperation, as well as greatercontrol and comfort.

D I G I TA L PA N E L

Rubber crawlerOn the KX121-3α, the rubber crawlerdesign has better durability andstability when travelling. The lugpattern, with more ground contactsurface and steel core positioning, aredesigned for better stability and lessvibration when travelling. In addition,the double flange type track rollerscontribute to better machine stability.

Easier maintenance and the durable structure arethe result of our considerations to enable you towork comfortably every day.

Kubota engineKubota's unique New E-TVCS (Three Vortex Combustion System)enables high energy output, low vibration, and low fuel consumption.In addition, it minimises exhaust emissions. Among a variety ofKubota engine models which are highly-renowned in the compactequipment market, the KX121-3αopted for the most suitable enginefor its machine size in both performance and economy. The idealchoice in both machine running costs and the environment.

Control valve inspectionA quick and easy inspection of thecontrol valve is possible simply byopening the latch on the bonnetlocated to the right of the cabin.When more detailed maintenance orrepairs are required, the remainingpanels on the swing frame can beeasily removed using standard tools.

Engine inspectionPrimary points like the engine and aircleaner can be inspected and maintainedquickly and easily via the rear enginecover. Fuel filter and water separator areindependently installed and both arelocated inside engine bonnet for the easierinspection. An engine inspection windowis also located behind the seat for easieraccess to the engine’s injection nozzles.

Protected bucket cylinder hosesThe bucket cylinder hoses arerouted within the arm to protect fromdamage. This ensures a longerservice life and lower repair costs.Operator visibility is also improved.

Travelling lock systemWhenever the pilot control safetylever is not engaged, the travellevers are locked mechanically toprevent unexpected machinemovement especially when theoperator enters or exits the cabin.

Swivel negative brakeWith the swivel negative brake,the swivel function is lockedautomatically whenever theengine is stopped or the pilotcontrol safety lever is raised.This feature eliminates the needfor a swivel transport lock pin.

Two piece hose designThe innovative two piece hose designon the dozer and boom cylinders ofthe KX121-3αreduces hosereplacement time by 60 % comparedto non-joint types. What’s more, thisdesign virtually eliminates the need toenter the machine for maintenance.

Standard Equipment

Engine/Fuel system • Double element air cleaner• Electric fuel pump• Auto idling system

Cabin• ROPS (Roll-Over Protective

Structure, ISO3471)• FOPS (Falling Objects Protective

Structure) Level 1• Weight-adjustable full

suspension seat• Seatbelt• Hydraulic pilot control levers with

wrist rests• Travel levers with foot pedals• Cabin heater for defrosting

& demisting• Emergency exit hammer• Front window power-assisted with

2 gas dampers• 12 V power source for radio-stereo• 2 speakers and radio antenna• Location for radio

Undercarriage• 350 mm rubber track • 1 x upper track roller• 4 x outer flange type lower track roller• 2 speed travel switch on dozer lever• Bracket for anti-theft locking device

Hydraulic system• Pressure accumulator• Hydraulic pressure checking ports• Straight travel circuit • Third line hydraulic return• Auxiliary switch on right control lever

Safety system• Engine start safety system on the

left console• Travel lock system on the

left console• Swivel lock system• Boom anti-fall circuit in the

control valve

Working equipment• 1300 mm arm• Auxiliary hydraulic circuit piping to

the arm end• 2 working lights on cabin and 1 light

on the boom

Optional Equipment

Working equipment• 1600 mm arm• Telescopic arm

Undercarriage• 350 mm steel track (+ 220 kg)

Safety system• Overload warning buzzer• Anti-theft device

Cabin• Air conditioning

3980

0.12/0.11

624

600

V2203-M-EBH-2-N

Water-cooled, diesel engineE-TVCS (Economical, ecological type)

40/2250

29.4/2250

4

83 × 92.4

2197

5060

2490

9.4

350

kg

m3

mm

mm

PS/rpm

kW/rpm

mm

cc

mm

mm

rpm

mm

Machine weight

Bucket capacity, std. SAE/CECE

Bucketwidth

Engine

Overall length

Overall height

Ground contact pressure

Ground clearance

Swivelling speed

Rubber shoe width

Cabin

With side teeth

Without side teeth

Model

Type

Output ISO9249

Number of cylinders

Bore × Stroke

Displacement

Cabin

1710

1700 × 350

Variable displacement pump

94.5

24.5 (250)

20.5 (2095)

32.5 (3315)

80/50

60

24.5 (250)

44

64

3.0

5.0

29.8 (0.304)

330

Tumbler distance

Dozer size (width × height)

Hydraulic pumps

Max. digging force

Boom swing angle (left/right)

Auxiliary circuit

Hydraulic reservoir

Fuel tank capacity

Max. travellingspeed

P1

Flow rate

Hydraulic pressure

Arm

Bucket

Flow rate

Hydraulic pressure

Low

High

Cabin

mm

mm

/min

MPa (kgf/cm2)

kN (kgf)

kN (kgf)

deg

/min

MPa (kgf/cm2)

km/h

km/h

kPa (kgf/cm2)

mm

SPECIFICATIONS WORKING RANGE*Rubber shoe type

1300

1700

1700

480

460

2560

(28

50)

3210

(35

10)

5190 (5480)5320 (5600)

17102180

15105060

2490

360

410

2020 (2070)

5210

(54

10)

3690

(38

90)

( ): Long ArmUnit: mm

W21PS00263

Lifting point radius (3m)

Over-front

Blade UPOver-side Over-side

Over-side Over-side

Blade Down Blade UpBlade Down

Blade UPBlade Down Blade UPBlade Down

Over-front

Over-front Over-front

Unit:kN (ton)

7.8 (0.79)

10.0 (1.02)

9.9 (1.01)

9.6 (0.98)

7.8 (0.79)

9.4 (0.96)

8.8 (0.90)

8.5 (0.87)

-

-

5.8 (0.59)

-

-

-

5.5 (0.56)

-

7.8 (0.79)

10.0 (1.02)

12.7 (1.29)

13.8 (1.41)

Lifting point radius (max.)

Lifting point radius (3m) Lifting point radius (max.)

-

-

5.0 (0.51)

-

Lift Point Height

3m

2m

1m

0m

-

8.9 (0.90)

9.9 (1.01)

9.5 (0.97)

-

8.9 (0.90)

8.8 (0.90)

8.4 (0.86)

-

-

7.4 (0.76)

-

-

-

5.2 (0.53)

-

-

8.9 (0.90)

11.8 (1.21)

13.5 (1.38)

-

-

4.7 (0.48)

-

Lift Point Height

3m

2m

1m

0m

With Cabin, Rubber shore, Standard Arm

Unit:kN (ton)With Cabin, Rubber shore, Long Arm

LIFTING CAPACITY

* Working ranges are with Kubota standard bucket, withoutquick coupler.

* Specifications are subject to change without notice forpurpose of improvement.

Please note:* The lifting capacities are based on ISO 10567 and do not exceed 75% of the static tilt load of the machine or 87% of the hydraulic lifting

capacity of the machine.* The excavator bucket, hook, sling and other lifting accessories are not included on this table.

Lift Point Radius

Axis of Rotation

Lift Point

Lift Point Height

KUBOTA EUROPE S.A.S. 19 à 25, Rue Jules Vercruysse Zone Industrielle - B.P. 50088 95101 Argenteuil Cedex France Téléphone : (33) 01 34 26 34 34 Télécopieur : (33) 01 34 26 34 99

http://www.kubota-global.net