303.5 CR

Net Power: 23.6 hp / 17.6 kW
Operating Weight: 9239 lb / 4190 kg
Dig Depth: 122.4 in / 3110 mm

The upgraded 303.5 CR delivers power and performance in a wide range of applications. Faster transient speeds, coupled with exclusive features like stick steer joystick travel get you moving quickly and comfortably so you can focus on the task at hand.

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Build & Quote

303.5 CR Small Product Brochure (Global except China and Japan) Cat Mini Hydraulic Excavators Product Line Brochure (North America) Cat Mini Hydraulic Excavators Product Line Brochure (Europe) Options And Accessories Kit Guide for Mini Hydraulic Excavators Cat Attachments for Mini Excavators Brochure Attachment Compatibility Guide for Mini Excavators

Specifications
Equipment
Related Products

Engine
Net Power	23.6 hp / 17.6 kW
Engine Model	C1.7
Net Power @ 2,200 rpm - U.S. EPA Tier 4 Final/EU Stage V - ISO 9249/EEC 80/1269	23.6 hp / 17.6 kW
Net Power - ISO 9249	24.7 hp / 18.4 kW
Bore	3.3 in / 84 mm
Stroke	3.9 in / 100 mm
Displacement	104 in³ / 1.7 l
Emissions	Meets U.S. EPA Tier 4 Final and EU Stage V emission standards.
Note	Advertised power is tested per the specified standard in effect at the time of manufacture.
Note (1)	Net power advertised is the power available at the flywheel when the engine is at the rated speed of 2,200 rpm and the engine is installed with the factory configured fan, air intake system, exhaust system and alternator with a minimum alternator load.

Weights
Operating Weight	9239 lb / 4190 kg
Minimum Operating Weight with Canopy*	7673 lb / 3480 kg
Maximum Operating Weight with Canopy**	8930 lb / 4050 kg
Minimum Operating Weight with Cab*	7982 lb / 3620 kg
Maximum Operating Weight with Cab**	9239 lb / 4190 kg
EU: CE Plate Weight with Canopy***	7784 lb / 3530 kg
EU: CE Plate Weight with Cab***	8004 lb / 3630 kg
Note (1)	*Minimum Weight is based on fixed rubber tracks, operator, full fuel tank, standard stick, blade, no bucket and extra counterweight.
Note (2)	**Maximum Weight is based on steel tracks, operator, full fuel tank, long stick, blade, no bucket and extra counterweight.
Note (3)	***CE Plate Weight is based on the most common EU configuration. Includes 75 kg (165 lb) operator and full fuel tank and excludes bucket.

Weight Increase from Minimum Configuration
Cab	309 lb / 140 kg
Counterweight	221 lb / 100 kg
Extra Counterweight	551 lb / 250 kg
Long Stick	44 lb / 20 kg
Steel Tracks	287 lb / 130 kg
Angle Blade	353 lb / 160 kg

Travel System
Travel Speed - High	2.8 mile/h / 4.5 km/h
Travel Speed - Low	1.6 mile/h / 2.6 km/h
Maximum Traction Force - High Speed	3799 lbf / 16.9 kN
Maximum Traction Force - Low Speed	6969 lbf / 31 kN
Ground Pressure - Minimum Weight	4.3 psi / 29.6 kPa
Ground Pressure - Maximum Weight	5.2 psi / 35.7 kPa
Gradeability - Maximum	30 degrees

Service Refill Capacities
Cooling System	1.8 gal (US) / 7 l
Engine Oil	1.6 gal (US) / 6 l
Fuel Tank	11.9 gal (US) / 45 l
Hydraulic Tank	5.3 gal (US) / 20 l
Hydraulic System	11.9 gal (US) / 45 l

Hydraulic System
Type	Load Sensing Hydraulics with Variable Displacement Piston Pump
Pump Flow at 2,400 rpm	26 gpm / 100 L/min
Operating Pressure - Equipment	3553 psi / 245 bar
Operating Pressure - Travel	3553 psi / 245 bar
Operating Pressure - Swing	2625 psi / 181 bar
Auxiliary Circuit - Primary - Flow	18 gpm / 70 L/min
Auxiliary Circuit - Primary - Pressure	3553 psi / 245 bar
Auxiliary Circuit - Secondary - Flow	7 gpm / 25 L/min
Auxiliary Circuit - Secondary - Pressure	3553 psi / 245 bar
Digging Force - Stick - Standard	4249 lbf / 18.9 kN
Digging Force - Stick - Long	3799 lbf / 16.9 kN
Digging Force - Bucket	7419 lbf / 33 kN
Note	*Flow and pressure are not combinable. Under load, as flow rises pressure goes down.

Swing System
Machine Swing Speed	9 r/min
Boom Swing - Left	75 °
Boom Swing - Right	50 °

Blade
Width	70.1 in / 1780 mm
Height	13.8 in / 350 mm

Certification - Cab and Canopy
Roll Over Protective Structure (ROPS)	ISO 12117-2:2008
Tip Over Protective Structure (TOPS)	ISO 12117:1997
Top Guard	ISO 10262:1998 (Level I)

Dimensions - Standard Stick
Dig Depth	110.6 in / 2810 mm
Vertical Wall	88.6 in / 2250 mm
Maximum Reach - Ground Level	202 in / 5130 mm
Maximum Reach	207.5 in / 5270 mm
Maximum Dig Height	193.7 in / 4920 mm
Maximum Dump Clearance	137.4 in / 3490 mm
Boom In Reach	69.3 in / 1760 mm
Tail Swing without Counterweight	35 in / 890 mm
Tail Swing with Extra Counterweight	39.6 in / 1005 mm
Maximum Blade Depth	21.1 in / 535 mm
Maximum Blade Height	15.2 in / 385 mm
Boom Height - Shipping Position	59.8 in / 1520 mm
O/A Shipping Height	97.6 in / 2480 mm
Swing Bearing - Height	22.2 in / 565 mm
O/A Undercarriage Length	87.4 in / 2220 mm
Overall Shipping Length*	189 in / 4800 mm
Boom Swing - Right	34.3 ° / 870 mm
Boom Swing - Left	25.2 ° / 640 mm
Track Belt/Shoe Width	11.8 in / 300 mm
Track Width	70.1 in / 1780 mm
Minimum Ground Clearance Below Undercarriage	12.2 in / 310 mm
Stick Length	49.6 in / 1260 mm
Note	*Overall Shipping Length depends on blade position during shipment.

Dimensions - Long Stick
Dig Depth	122.4 in / 3110 mm
Vertical Wall	94.1 in / 2390 mm
Maximum Reach - Ground Level	211.8 in / 5380 mm
Maximum Reach	216.9 in / 5510 mm
Maximum Dig Height	197.6 in / 5020 mm
Maximum Dump Clearance	141.7 in / 3600 mm
Boom In Reach	73.2 in / 1860 mm
Tail Swing without Counterweight	35 in / 890 mm
Tail Swing - with Extra Counterweight	39.6 in / 1005 mm
Maximum Blade Depth	21.1 in / 535 mm
Maximum Blade Height	15.2 in / 385 mm
Boom Height - Shipping Position	68.9 in / 1750 mm
O/A Shipping Height	97.6 in / 2480 mm
Swing Bearing - Height	22.2 in / 565 mm
O/A Undercarriage Length	87.4 in / 2220 mm
Overall Shipping Length*	190.9 in / 4850 mm
Boom Swing - Right	34.3 ° / 870 mm
Boom Swing - Left	640 mm / 25.2 °
Track Belt/Shoe Width	11.8 in / 300 mm
Track Width	70.1 in / 1780 mm
Minimum Ground Clearance Below Undercarriage	12.2 in / 310 mm
Stick Length	61.4 in / 1560 mm
Note	*Overall Shipping Length depends on blade position during shipment.

Air Conditioning System
Air Conditioning	The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a or R1234yf (Europe) (Global Warming Potential = 1430). See label or instruction manual for gas refrigerant identification. The system contains 0.75 kg (1.65 lb), 0.90 kg (1.98 lb) or 1.0 kg (2.20 lb) of refrigerant which has a CO2 equivalent of 1.430 metric tonnes (1.576 tons) for R134a and 0.001 tonnes (0.001 tons) for R1234yf (Europe).

Air Conditioning System

Air Conditioning

The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a or R1234yf (Europe) (Global Warming Potential = 1430). See label or instruction manual for gas refrigerant identification. The system contains 0.75 kg (1.65 lb), 0.90 kg (1.98 lb) or 1.0 kg (2.20 lb) of refrigerant which has a CO2 equivalent of 1.430 metric tonnes (1.576 tons) for R134a and 0.001 tonnes (0.001 tons) for R1234yf (Europe).

Sound
Operator Sound Pressure (ISO 6396:2008)	78 dB(A)
Average Exterior Sound Pressure (ISO 6395:2008)	94 dB(A)
Note	European Union Directive ‚ "2000/14/EC"

Sustainability
Recyclability	95%

Standard Equipment

ENGINE
- Cat C1.7 NA Engine (U.S. EPA Tier 4 Final/EU Stage V)
- Cat C1.7 NA Engine (U.S. EPA Tier 4 Final/EU Stage V)
- Automatic Engine Idle
- Automatic Engine Idle
- Automatic Engine Shutdown
- Automatic Engine Shutdown
- Automatic Two Speed Travel
- Automatic Two Speed Travel
- Fuel Water Separator
- Fuel Water Separator
- Power on Demand (not available in all regions)
- Power on Demand (not available in all regions)
- Variable Displacement Piston Pump
- Variable Displacement Piston Pump
- Load Sensing/Flow Sharing Hydraulics
- Load Sensing/Flow Sharing Hydraulics
HYDRAULICS
- Smart Tech Electronic Pump
- Accumulator
- Smart Tech Electronic Pump
- Automatic Swing Brake
- Accumulator
- Auxiliary Line Quick Disconnects
- Automatic Swing Brake
- One and Two Way Auxiliary Flow
- Auxiliary Hydraulic Lines
- Continuous Auxiliary Flow
- One and Two Way Auxiliary Flow
- Auxiliary Hydraulic Lines
- Continuous Auxiliary Flow
- Auxiliary Line Quick Disconnects
OPERATOR ENVIRONMENT
- Tilt-up Canopy or Tilt-Up Cab
- Stick Steer Mode
- Tilt-up Canopy or Tilt-Up Cab
- Travel Cruise Control
- Top Guard ISO 10262:1998 Level I
- Control Pattern Changer (optional in some regions)
- ROPS – ISO 12117-2:2008
- Adjustable Wrist Rests
- TOPS – ISO 12117:1997
- Washable Floor Mat
- Travel Pedals and Hand Levers
- Stick Steer Mode
- Machine Security
- Travel Cruise Control
- Machine Security – Standard Key with Pass Code
- Control Pattern Changer (optional in some regions)
- Fabric Suspension Seat (Cab only)
- Adjustable Wrist Rests
- Vinyl Suspension Seat (Canopy only)
- Washable Floor Mat
- Hydraulic Lockout – All Controls
- Travel Pedals and Hand Levers
- Retractable High Visibility Seat Belt (75 mm/3 in)
- Machine Security
- Coat Hook
- Machine Security – Standard Key with Pass Code
- Cup Holder
- Fabric Suspension Seat (Cab only)
- Storage Pocket
- Vinyl Suspension Seat (Canopy only)
- Skylight
- Hydraulic Lockout – All Controls
- Mounting Bosses for Front
- Retractable High Visibility Seat Belt (75 mm/3 in)
- Signaling/Warning Horn
- Coat Hook
- Interior Light (Cab only)
- Cup Holder
- Boom Light, Halogen (not available in all regions)
- Storage Pocket
- Utility Space for Mobile Phone
- Skylight
- Next Generation Color LCD Monitor (IP66)
  – Fuel Level and Coolant Temperature Gauges
  – Maintenance and Machine Monitoring
  – Performance and Machine Adjustments
  – Numeric Security Code
  – Multiple Languages
  – Hour Meter with Wake Up Switch
  – Jog Dial (cab only)
- Mounting Bosses for Front
- Signaling/Warning Horn
- Interior Light (Cab only)
- Boom Light, Halogen
- Utility Space for Mobile Phone
- Next Generation Color LCD Monitor (IP66)
  – Fuel Level and Coolant Temperature Gauges
  – Maintenance and Machine Monitoring
  – Performance and Machine Adjustments
  – Numeric Security Code
  – Multiple Languages
  – Hour Meter with Wake Up Switch
  – Jog Dial (cab only)
  
  Next Generation Advanced Monitor (Optional)
  – Fuel Level and Coolant Temperature Gauges
  – Maintenance and Machine Monitoring
  – Performance and Machine Adjustments
  – Numeric Security Code
  – Multiple Languages
  – Hour Meter with Wake Up Switch
UNDERCARRIAGE
- Rubber Belt (300 mm/11.8 in wide)
- Dozer Blade
- Dozer Blade Float
- Tie Downs on Track Frame
- Rubber Belt (300 mm/11.8 in wide)
- Dozer Blade
- Dozer Blade Float
- Angle Blade
- Tie Downs on Track Frame
BOOM, STICK AND LINKAGES
- One Piece Boom (2400 mm/94.5 in)
- Standard Stick (1260 mm/49.6 in)
- Front Shovel Capable
- Front Shovel Capable – Pin-On
- Thumb Ready (not available in all regions)
- Certified Lifting Eye (optional in some regions)
- One Piece Boom (2400 mm/94.5 in)
- Standard Stick (1260 mm/49.6 in)
- Front Shovel Capable – Pin-On
- Thumb Ready (not available in all regions)
- Certified Lifting Eye (optional in some regions)
GUARDING
- ROPS – ISO 12117-2:2008
- TOPS – ISO 12117:1997
- Top Guard ISO 10262:1998 (Level I)
ELECTRICAL
- 12 Volt Battery
- Software (machine and monitor)
- Maintenance Free Battery
- Lock Out/Tag Out Battery Disconnect
- Signaling/Warning Horn
- 12 Volt Power Socket
- 12 Volt Battery
- Software (machine and monitor)
- Maintenance Free Battery
- Signaling/Warning Horn
- 12 Volt Power Socket

Optional Equipment

OPERATOR ENVIRONMENT
- Cab with Air Conditioning
- Cab with Air Conditioning
- Cab with Heater
- Cab with Heater
- Control Pattern Changer (optional in some regions)
- Control Pattern Changer (optional in some regions)
- No Travel Pedals and Hand Levers
- No Travel Pedals and Hand Levers
- Machine Security – Push to Start with Key Fob/Pass Code
- Machine Security – Push to Start with Key Fob/Pass Code
- Vinyl Non-Suspension Seat (Canopy only)
- Vinyl Non-Suspension Seat (Canopy only)
- Seat Belt Reminder System
- LED Front Lights
- LED Front Lights
- LED Front and Rear Lights
- LED Front and Rear Lights
- LED Boom Light
- LED Boom Light
- Mirrors Left and Right
- Mirrors Left and Right
- Radio – Bluetooth®, Auxiliary, Microphone, USB (charging only) (Cab only)
- Radio – Bluetooth®, Auxiliary, Microphone, USB (charging only) (Cab only)
- Next Generation Advanced Monitor
  – Touch Screen
  – Site Reference System
  – High Definition Camera Capable (IP68 and IP69K)
  – Numeric Security Code
UNDERCARRIAGE
- Steel Track (300 mm/11.8 in wide)
- Steel Track (300 mm/11.8 in wide)
- Angle Blade
BOOM, STICK AND LINKAGES
- Long Stick (1560 mm/61.4 in)
- Long Stick (1560 mm/61.4 in)
- Front Shovel Capable – Dual Lock Manual Coupler
- Front Shovel Capable – Dual Lock Manual Coupler
- Attachments including Couplers, Thumbs, Buckets, Augers and Hammers
- Front Shovel Capable – Hydraulic Coupler
- 2nd Auxiliary Hydraulic Lines
- 2nd Auxiliary Hydraulic Lines
- Boom Lowering Check Valve
- Attachments including Couplers, Thumbs, Buckets, Augers and Hammers
- Stick Lowering Check Valve
- Boom Lowering Check Valve (Standard in Europe)
- Hydraulic Quick Coupler Lines (not available in all regions)
- Stick Lowering Check Valve (Standard in Europe)
- Hydraulic Quick Coupler Lines (not available in all regions)
- Front Shovel Capable – Hydraulic Coupler
ELECTRICAL
- Battery Disconnect
- Product Link PL243 (regulations apply)
- Product Link PL243 (regulations apply)
- Product Link PLE643 (regulations apply)
- Product Link PLE643 (regulations apply)
- Travel Alarm (standard in some regions)
- Travel Alarm (standard in some regions)
GUARDING
- Polycarbonate Half Height Front Guard (Canopy only)
- Polycarbonate Front Guard (ISO 10262:1998 Level I and EN356 P5A)
- Guard, Canopy
- Guard, Mesh
OTHER
- Bio Oil Capable
- Eco Drain
- Water Jacket Heater
- Bio Oil Capable
- Light Counterweight (100 kg/221 lb)
- Eco Drain
- Extra Counterweight (250 kg/551 lb)
- Water Jacket Heater

Equipment Management

Cat® Equipment Management gives you access to the data you need to keep your equipment on the job site and earning money. You can track equipment location and hours, monitor machine use and health, then take informed action that will keep your operation running smoothly, efficiently and profitably.

Model
VisionLink™

Heavy Duty Buckets - Mini Excavator

High strength buckets designed for maximum performance and value over a broad range of applications.

Model	Width	Capacity	Weight
305 mm (12 in), 48 L (1.7 ft3), Pin On, 40 mm (1.6 in)	12 in / 305 mm	1.7 ft³ / 48.09 l	143.3 lb / 65 kg
406 mm (16 in), 71 L (2.5 ft3), Pin On, 40 mm (1.6 in)	16 in / 406 mm	2.5 ft³ / 70.8 l	163.1 lb / 74 kg
508 mm (20 in), 93 L (3.3 ft3), Pin On, 40 mm (1.6 in)	20 in / 508 mm	3.3 ft³ / 93.4 l	191.8 lb / 87 kg
619 mm (24 in), 119 L (4.2 ft3), Pin On, 40 mm (1.6 in)	24.4 in / 619 mm	4.2 ft³ / 118.9 l	216.1 lb / 98 kg
914 mm (36 in), 200 L (7.1 ft3), Pin On, 40 mm (1.6 in)	36 in / 914 mm	7.1 ft³ / 199.89 l	293.2 lb / 133 kg

Augers

Designed to drill holes for footings, fencing, signs and trees.

Model	Drive Shaft Torque at Maximum Pressure	Drive Method	Mounting Bracket Design
A23, 3 Ton Mini Excavators	1699.3 lb/ft / 2304 N·m	Gerotor Motor - Direct Drive	3 Ton Mini Excavator Pin On
A41, 3 Ton Mini Excavators	3038.8 lb/ft / 4120 N·m	Gerotor Motor - Single Planetary Reduction	3 Ton Mini Excavator Pin On

Digging Buckets - Mini Excavator

These buckets are ideal for digging in soft to moderate ground.

Model	Width	Capacity	Weight
300 mm (12 in), 41 L (1.4 ft3), CW05 Coupler, Bolt-On Teeth	11.8 in / 300 mm	1.4 ft³ / 41 l	112.4 lb / 51 kg

Ditch Cleaning Buckets - Mini Excavator

Used in ditch cleaning, sloping, grading and other finishing work.

Model	Width	Weight	Tip Radius
1000 mm (40 in), 136 L (4.8 ft3), Pin On	40 in / 1000 mm	240.1 lb / 108.9 kg	21.6 in / 548 mm
1200 mm (47 in), 167 L (5.9 ft3), Pin On	47.2 in / 1200 mm	235.7 lb / 106.9 kg	21.6 in / 548 mm
1400 mm (55 in), 197 L (7 ft3), Pin On	55.1 in / 1400 mm	259.2 lb / 117.59 kg	21.6 in / 548 mm

Dual Lock™ Pin Grabber Couplers - Mini Excavator

Increase machine versatility and improve overall production.

Model	Weight	Width	Length
3-4 Ton Mini Excavators Hydraulic	90.4 lb / 41 kg	9.9 in / 252 mm	16.7 in / 423 mm

Tiltrotators

Helps you get the job done faster with the quality you expect from Cat products. Integrated to your excavator, Tiltrotators are productive, easy-to-use, and add value to your operation. Tiltrotators are a versatile solution providing enhancements to your operation.

Model	Machine Class	Weight	Interface Options: Top-Bottom
TRS4, Pin On (Pin Grabber)/S40, 3-4 Ton Mini Excavators	3-4 Ton Mini Excavators	297.6 lb / 135 kg	Pin On (Pin Grabber) Coupler / S40 Coupler
TRS4, Pin On (Pin Grabber)/S40, 3-4 Ton Mini Excavators	3-4 Ton Mini Excavators	297.6 lb / 135 kg	Pin On (Pin Grabber) Coupler / S40 Coupler