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EngineModel Mitsubishi S3Q2Rated net power 22 kW 30 hp(ISO 9249)

WeightsOperating weight 3435 kg 7,575 lbwith canopyOperating weight 3555 kg 7,835 lbwith cab

• Weight with counterweight, rubber tracks, bucket,operator, full fuel and auxiliary lines.

• Weight varies depending on machine configuration.

303C CRMini HydraulicExcavators

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303C CR Mini Hydraulic ExcavatorsEngineered by Caterpillar® to deliver high levels of productivity, versatility and serviceability.

Powerful performance levels in a compactradius machine. The Cat 303C CR delivershigh productivity in the tightest applications.

Low Operating Costs

Robust, reliable and easily serviced arekey attributes of the C Series CRdesign. Service points are easilyaccessed through the rear door and sidecover and a 500-hour engine oil changeperiod lowers operating costs. pg. 6

Performance and Versatility

High dig forces, fast cycle times andhigh bucket rotation angles deliver theproductivity that customers demand. Achoice of stick lengths and Cat® WorkTools makes the 303C CR even moreversatile. pg. 5

Comfort and Ease of Operation

Cab or canopy, the 303C CR offers aspacious and comfortable work areawith expansive legroom. Compactradius design gives greater machineversatility and the capability to workwithin confined areas. pg. 4

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Customer Support

Caterpillar dealers offer unmatchedcustomer support with excellentequipment management services andfast parts availability, resulting inmaximum uptime and minimum repaircosts. pg. 8

Angle Blade Configuration

The versatility and productivity of theCat C Series machine can be increasedeven further by ordering the hydraulicangling dozer blade configuration.pg. 7

Impressive Cab Dimensions. The CR C Series gives the operator acomfortable and spacious workingenvironment with excellent visibility.

The clear flat floor space and superioroperator legroom provide high levels ofoperator comfort and help minimizefatigue.

Optional Air Conditioning. Optional airconditioning or fan and sun blindpackage offers further operator comfort.

Sliding Cab Door. The sliding doorsystem offers good access andmaintains the machine’s compactdimensions to reduce the risk ofdamage.

Fully Pilot Operated Controls. Pilotoperated controls on all servicesincluding travel levers and dozerfunction ensure that “as new” levels ofcontrollability are maintainedthroughout the machine life.

Automatic Two Speed Function.Improves machine maneuverabilityaround the job site. Increasedproductivity is achieved by balancinghigh speed travel requirements withcontrollability.

Joystick Mounted Auxiliary and BoomSwing Functions. The new joystickmounted position of these functionsgives “fingertip” control and a clear cabfloor.

Compact Radius Design. Compactradius design gives greater machineversatility and the capability to workwithin confined areas. The radius of theupper body stays within the width of theundercarriage so the operator canconcentrate on the work being donewithout having to worry about the backof the machine.

High Level of Standard ComfortFeatures. Reclining suspension seat,power point, adjustable wrist rests and acup holder are standard features on theCat C CR machines.

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Comfort and Ease of OperationClass leading space and top level feature lead to a comfortable and productiveenvironment.

Fast, Powerful Digging. High diggingforces and fast cycle times throughsmooth responsive hydraulics, ensurethat the Cat C Series CR machinesdeliver the productivity that customersdemand.

Load Sensing Hydraulics. Load sensinghydraulics optimize flow for smoothpowerful performance and increasedfuel economy.

Dozer Blade Float Function. The dozerfloat enables easy ground levelling forlandscaping and finishing applications,as well as more efficient site clean-up.

Stick Options. A choice of standard orlong stick enables matching of machineto application.

Hydraulic ‘Thumb Ready’ Sticks. AllCat CR C Series machines comestandard with stick mounted brackets,ready to fit a hydraulic thumb.

Auxiliary Lines and Connectors. Theauxiliary lines and connectors includingquick connections are fitted as standard,meaning the Cat 303C CR come readyto work. Hammer (one-way) and auger(two-way) auxiliary lines are also fittedas standard.

Mechanical Quick Coupler. The CatQuick Coupler makes tool changes fastand easy. It maximizes performance asit is compatible with all standard worktools.

Work tool versatility is furtherenhanced with the option of a secondadditional auxiliary supply.

Wide Range of Work Tools. These toolsare designed to get the best out of themachine and deliver excellent valuethrough high productivity and long life.Tools include:

• Digging buckets

• Ditch cleaning buckets

• Angling ditching buckets

• Hydraulic hammers

• Augers

Bucket Angle. High rotation bucketangle combines good spoil retention andflat back trench characteristics.

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Performance and VersatilityThe range of Cat buckets and hydraulically powered tools are machine matched to optimizeperformance.

Swing Out Rear Door. Provides accessto major components and service points:

• Engine oil check and fill

• Vertically mounted engine oil filter

• Starter motor

• Alternator

S•O•SSM Oil Sampling Valve. Allowseasy sampling of the hydraulic fluid forpreventative maintenance.

500 Hour Oil and Filter Change Period.Reduces operating costs and machinedown time.

Automatic Engine Idle. Automaticallylowers engine revs when not in use toconserve fuel and lower environmentalnoise/emissions.

Lifting Side Hood. Allows excellentaccess to:

• Air filter

• Main implement valve

• Auxiliary change over valve

• Accumulator

• Fuel filter

• Hydraulic tank

• Radiator and oil cooler

Front Linkage. Protected front linkagelines are routed above the boom andstick to help reduce damage anddowntime.

End Dampening. End dampening onboth boom and stick cylinders reducesshock loading, increasing componentlife and improving soil retention whenloading at height.

Liner Bearings. Liner bearings in theswing casting deliver longer componentlife and reduced parts replacementcosts.

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Low Operating CostsGood access to main check points and major components makes servicing and maintainingthe 303C CR easier.

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Angle Blade ConfigurationIncreased versatility and productivity are offered with the Cat angle blade.

Versatility and Productivity. The Cat C Series machine can be made evenmore productive by ordering the angledozer blade configuration.

Strong and Durable. The Cat hydraulicangle blade is engineered to be strongand durable with a hardened steel wearedge and good protection to cylindersand hydraulic lines.

Angle Blade Positioning. The angleblade can be positioned straight aheador angled up to 25 degrees to the left orright reducing the number of timesrequired to back-up and reposition whenbackfilling thus reducing operationtime.

Single Control Lever. All dozerfunctions are controlled from inside thecab, with fully proportional fingertipcontrol to position the blade at anyangle, from the start to 25 degrees leftor right while travelling in eitherdirection.

Full Pilot Control. Full pilot controlmeans no cables or linkages to wear,keeping ”as new” controllabilitythroughout the machines life andreducing maintenance costs.

Load Sensing Hydraulics, High TractionForce and Auto 2-Speed Travel. Thesefeatures are standard on the Cat CSeries CR machines and ideally suitedfor getting the best out of the anglingblade installation.

Excellent Blade Visibility. The compactradius design of the Cat C Seriesmachines gives excellent visibility tothe blade in any position, allowing theblade to be positioned behind theoperator and away from the frontlinkage for better access when backdragging and finishing in tight areas.

25º

25º250

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Selection. Make detailed comparisonsof the machines under considerationbefore you purchase. Your Cat dealercan give you precise answers to yourquestions, as well as estimatecomponent life, preventive maintenancecost and the true cost of lost production.

Purchase. Look past initial price.Consider the flexible financing optionsavailable, as well as day-to-dayoperating costs. Look at dealer servicesthat can be included in the cost of themachine to yield lower equipmentowning and operating costs over thelong haul. Your Cat dealer can providea package to meet your needs.

Operation. Improving operatingtechniques can boost your profits. YourCat dealer has training literature, videotapes, classes and other ideas to helpincrease your productivity.

Equipment Maintenance Services.More and more equipment buyers areplanning for effective maintenancebefore buying. Choose from yourdealer’s wide range of maintenanceservices at the time you purchase yournew machine. Repair option programsguarantee the cost of repairs up front.Services that help optimize machineperformance include:

• Customer Support Agreements

• S•O•SSM and Coolant Sampling andTechnical Analysis

• Maintenance contracts

• Scheduled technical inspections

Unmatched Product Support. You willfind nearly all parts at our dealer partscounter. Cat dealers use a world-widecomputer network to find in-stock partsto minimize machine downtime.

Save money with genuine CatRemanufactured parts. You receivethe same warranty and reliability asnew products at a cost savings of40-70 percent.

SAFETY.CAT.COM™.

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Customer SupportIndustry-leading customer support is provided by the Cat dealer network.

9303C CR Mini Hydraulic Excavators specifications

Hydraulic System

Load sensing hydraulics with variable displacement pumpPump flow at 2300 RPM 85 L/min 22.5 gal/minOperating pressures – 245 bar 3,553 psiequipmentOperating pressure – travel 245 bar 3,553 psiOperating pressure – swing 172 bar 2,495 psiAuxiliary circuit – Primary 60 L/min 15.85(245 bar/3,553 psi) gal/minAuxiliary circuits – Secondary 27 L/min 7.15 gal/min(174 bar/2,524 psi)Digging forces – stick (standard) 18.9 kN 4,250 lbDigging force – stick (long) 16.9 kN 3,799 lbDigging force – bucket 33.0 kN 7,420 lb

Swing System

Machine swing speed 9 RPMBoom swing – left (without stop) 80ºBoom swing – left (with stop) 55ºSwing – right 50º

• Automatic swing brake, spring applied, hydraulic release

• Centralized lubrication

Sound Levels

Canopy 78 dB(A)Cab 82 dB(A)

• Operator sound pressure levels measured per ISO 6396(dynamic).

Electrical System

• 50-amp alternator

• 12-volt, 650 CCA, 52 amp/h maintenance-free battery

• Sealed electrical connectors

Blade

Width 1550 mm 61.0 inHeight 325 mm 12.8 inDig depth 470 mm 18.5 inLift height 400 mm 15.8 in

• Blade flotation function provides easier operation

• Replaceable, hardened, wear resistant cutting edge

Engine

Model Mitsubishi S3Q2Rated net power (ISO 9249) 22 kW 30 hpGross power 23 kW 31 hp

• Net power rating per ISO 9249 and EEC 80/1269

• Meets U.S. EPA Interim Tier 4 emission regulations

Weights

Operating weight with canopy 3435 kg 7,575 lbOperating weight with cab 3555 kg 7,835 lb

• Weight with counterweight, rubber tracks, bucket, operator,full fuel and auxiliary lines.

• Weight varies depending on machine configuration.

Engine Dimensions

Bore 88 mm 3.45 inStroke 103 mm 4.05 inDisplacement 1.9 L 116 in3

Travel System

Travel speed – high 4.6 km/h 2.8 mphTravel speed – low 2.6 km/h 1.6 mphMax traction force – high 17.7 kN 3,979 lbspeedMax traction force – low speed 33.4 kN 7,508 lbGradeability (max) – high 30º

• Each track is driven by one independant 2-speed motor

• Drive modules are integrated into the roller frame for totalprotection

• Straight line travel when tracking and operating the frontlinkage simultaneously

Service Refill Capacities

Cooling system 6 L 1.6 galEngine oil 6 L 1.6 galFuel tank 45 L 11.9 galHydraulic tank 37 L 9.75 galHydraulic system 65 L 17.2 gal

10 303C CR Mini Hydraulic Excavators specifications

Dimensions and Lift Capacities

Standard Stick Long Stick

11 1340 mm 4'5" 1450 mm 4'9"

12 2500 mm 8'2" 2500 mm 8'2"

13 565 mm 1'10" 565 mm 1'10"

14 2220 mm 7'3" 2220 mm 7'3"

15 4740 mm 15'6" 4770 mm 15'8"

16 770 mm 2'6" 770 mm 2'6"

17 660 mm 2'2" 660 mm 2'2"

18 300 mm 1'0" 300 mm 1'0"

19 1550 mm 5'1" 1550 mm 5'1"

With tracks level on the ground.

Lift Capacities at Ground Level Over Front Over Side Over Front Over Side

Lift point radius 3000 mm 9'8" 3000 mm 9'8" 4800 mm 15'9" 4800 mm 15'9"

Blade down 1410 kg* 3,109 lb* 480 kg 1,058 lb 620 kg* 1,367 lb* 240 kg 529 lb

Blade up 650 kg 1,433 lb 440 kg 970 lb 320 kg 706 lb 210 kg 463 lb

*Limited by hydraulic capacity rather than tipping load.The above loads are in compliance with SAE hydraulic excavator lift capacity rating standard SAE J1097 and they do not exceed 87% of hydraulic lifting capacityor 75% of tipping capacity.The excavator bucket weight is not included on this chart. Lifting capacities for standard stick.

Standard Stick Long Stick

1 2910 mm 9'7" 3200 mm 10'5"

2 2400 mm 7'10" 2550 mm 8'4"

3 5100 mm 16'9" 5350 mm 17'7"

4 5230 mm 17'2" 5470 mm 17'11"

5 4950 mm 16'3" 5060 mm 16'7"

6 3490 mm 11'5" 3610 mm 11'10"

7 2060 mm 6'9" 2180 mm 7'2"

8 890 mm 2'11" 890 mm 2'11"

9 400 mm 1'4" 400 mm 1'4"

10 470 mm 1'7" 470 mm 1'7"

Track and blade width 1550 mm 5'1"

Gauge width 1250 mm 4'1"

Shoe width 300 mm 1'0"

11303C CR Mini Hydraulic Excavators specifications

Standard EquipmentStandard equipment may vary. Consult your Caterpillar dealer for details.

Gauges or indicators for fuel level engine coolant temperature, hour meter, engine oil pressure, air cleaner, alternator and glow plugs, service interval

HornHydraulic oil coolerLockable storage boxLow maintenance linkage pin jointsMaintenance free batteryRubber trackRetractable seatbeltStandard stickSuspension seat, vinyl covered‘Thumb ready’ sticksTravel alarmTwo speed travel

Additional counterweight 165 kg (364 lb)Adjustable wrist restsAlternatorAutomatic engine idleAutomatic swing park brakeAuxiliary hydraulic circuit valve, controls and

1 way hammer lines to the stick2 way (auger) auxiliary hydraulic lines to the stick

Auxiliary line quick couplersBoom cylinder guardCab mounted work lightCanopy with FOPS ISO10262 (Level 1) and

Tip-Over protection ISO12117Coat hook and cup holderControl pattern changerDial type acceleratorDozer blade with float functionFloor matFoot travel pedals

Optional EquipmentOptional equipment may vary. Consult your Caterpillar dealer for details.

Long stickMechanical quick couplerMirrors for cab and canopyRadio installation kitFactory fitted radio/CD playerSeatbelt, 75 mm (3 in) wideSuspension seat, fabric coveredHigh back suspension seat, fabric coveredTool kitWork tools

Air conditioningAdditional auxiliary linesBiodegradable hydraulic oilBoom check valveBoom mounted lightCab, fully glazed with FOPS ISO10262 (Level 1)

and Tip-Over Protection ISO 12117 with heater/defroster, interior light and windshield wiper/washer

Ecology drain valve for hydraulic tankEcology drain valve for Engine oilFan and sun blind installationFront screen guard for cab and canopyImmobilizer system

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For more complete information on Cat products, dealer services, and industry solutions, visit us on the web at www.cat.com

© 2007 CaterpillarAll Rights Reserved

Printed in U.S.A.

Materials and specifications are subject to change without notice.Featured machines in photos may include additional equipment.

See your Caterpillar dealer for available options.

CAT, CATERPILLAR, SAFETY.CAT.COM, their respective logos and “Caterpillar Yellow”and the POWER EDGE trade dress, as well as corporate and product identity used

herein, are trademarks of Caterpillar and may not be used without permission.

AEHQ5680-02 (12-07)

Replaces: AEHQ5680-01

303C CR Mini Hydraulic Excavators