303.5E CR

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The Cat 303.5E CR delivers high performance in a compact radius design to help you work in the tightest applications.


Engine Model Cat® C1.8 Cat® C1.8 Less
Net Power 31.6 hp 23.6 kW Less
Gross Power 33.3 hp 24.8 kW Less


Operating Weight 7734.0 lb 3508.0 kg Less
Operating Weight with Cab 8139.0 lb 3692.0 kg Less


Max digging depth - standard stick 9.6 ft 2880.0 mm Less
Max reach ground level - standard stick 16.7 ft 5060.0 mm Less
Height over cab 8.2 ft 2500.0 mm Less
Max cutting height - long stick 16.5 ft 5030.0 mm Less
Max cutting height - standard stick 16.2 ft 4920.0 mm Less
Max dump height - long stick 11.9 ft 3640.0 mm Less
Max dump height - standard stick 11.5 ft 3520.0 mm Less
Max horizontal reach - long stick 17.8 ft 5440.0 mm Less
Max horizontal reach - standard stick 17.1 ft 5200.0 mm Less
Max vertical dig depth - long stick 8.2 ft 2470.0 mm Less
Max vertical dig depth - standard stick 7.7 ft 2320.0 mm Less
Shipping Height 8.2 ft 2500.0 mm Less
Shipping Length 15.5 ft 4730.0 mm Less
Track Shoe Width 1.0 ft 300.0 mm Less
Transport Width 5.8 ft 1780.0 mm Less

Engine Dimensions

Bore 3.4 in 87.0 mm Less
Stroke 4.0 in 102.4 mm Less
Displacement 110.0 in3 1.8 L Less

Travel System

Max traction force - high speed 3799.0 lb 16.9 kN Less
Max traction force - low speed 6969.0 lb 31.0 kN Less
Travel Speed – High 2.8 mph 4.6 km/h Less
Travel Speed – Low 1.6 mph 2.6 km/h Less

Hydraulic System

Operating Pressure – Equipment 3553.0 psi 245.0 bar Less
Digging Forces – Stick (standard) 4249.0 lb 18.9 kN Less
Digging Force – Stick (long) 3799.0 lb 16.9 kN Less
Digging Force – Bucket 7419.0 lb 33.0 kN Less
Operating Pressure – Travel 3553.0 psi 245.0 bar Less
Operating Pressure – Swing 2625.0 psi 181.0 bar Less
Auxiliary circuit – primary 15.9 gal/min 60.0 L/min Less
Auxiliary circuit – secondary 7.1 gal/min 27.0 L/min Less

Swing System

Machine Swing Speed 9.0 RPM 9.0 RPM Less
Boom swing - left (without stop) 80.0 Degrees 80.0 Degrees Less
Boom swing - left (with stop) 55.0 Degrees 55.0 Degrees Less
Boom Swing – Right 50.0 Degrees 50.0 Degrees Less


Width 70.0 in 1780.0 mm Less
Height 12.8 in 325.0 mm Less
Dig Depth 18.5 in 470.0 mm Less
Lift Height 15.7 in 400.0 mm Less

Service Refill Capacities

Cooling System 1.5 gal 5.5 L Less
Engine Oil 1.8 gal 7.0 L Less
Hydraulic Tank 11.2 gal 42.3 L Less
Fuel Tank 12.2 gal 46.0 L Less
Hydraulic System 17.2 gal 65.0 L Less

MSC Comments

MSC Spec Date 3/06 3/06 Less

Operator Station

Superior comfort to keep you productive throughout the work day.


Powerful digging with precise control.

Zero Tail Swing

Work in the tightest areas.

Coupler and Work Tool Options

New coupler design and multiple work tools increase versatility.

Dozer Blade

Standard dozer blade maximizes productivity.


Stability and durability.


Simplified service and maintenance saves you time and money.

Customer Support

Support you can count on.

303.5E CR Standard Equipment

• 1-way and 2-way (combined function) auxiliary hydraulic lines

• Adjustable wrist rests

• Alternator

• Automatic engine idle

• Automatic swing park brake

• Automatic two speed travel

• Auxiliary line quick disconnects

• Boom cylinder guard

• Cab mounted work light

• Canopy with FOPS ISO 10262 (Level 1) and Tip-Over Protection (TOPS) ISO 12117

• Coat hook

• Cup holder

• Control pattern changer (not available in Europe)

• COMPASS display panel

• Dozer blade with float function

• Floor mat

• Foot travel pedals

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

• Horn

• Hydraulic oil cooler

• Lifting eye on bucket linkage (optional in Europe)

• Lockable storage box

• Low maintenance linkage pin joints

• Maintenance free battery

• Rubber track

• Seatbelt, 76 mm (3 in) wide, retractable (optional in Europe)

• Standard stick

• Suspension seat, vinyl covered

• "Thumb ready" stick (standard equipment in all regions except Europe)

• Travel alarm (optional in Europe)

303.5E CR Optional Equipment

• Air conditioning

• Angle dozer blade with float function

• Beacon socket for canopy machines

• Boom check valve (Europe only)

• Boom mounted light

• Cab, radio ready with FOPS ISO 10262 (Level 1), Tip-Over Protection (TOPS) ISO 12117, heater/defroster, interior light and windshield wiper/washer

• Ecology drain valve for hydraulic tank

• Ecology drain valve for engine oil

• Fan and sun blind installation

• Front screen guard for cab and canopy

• High back suspension seat, fabric covered

• Hydraulic quick coupler lines

• Long stick

• Mechanical quick coupler

• Mirrors for cab and canopy

• Secondary auxiliary hydraulic lines

• Steel track and steel track with rubber pads

Our Customers Say It Best - Blain Gibson

"Caterpillar makes my job easy because the technology on their newer equipment helps the job go faster."

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Mini Hydraulic Excavators Coupler and Attachments - Video

Watch the illustration to learn how the Cat® dual lock pin grabber coupler disengages with the bucket on Cat Mini Excavators.

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