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Cat Mini Excavator 303cs

Cat Mini Excavator 303cs

The Cat Mini Excavator 303cs provide you with the working advantages you need. Whether it’s more digging depth, more power, greater reach, more lift capacity, higher breakout force or more swing torque, this mini excavator can dig in and get the job done every time.

Product Specifications: (Specifications may change due to continuous product development)

Width 61 in / 1550 mm
Height 12.8 in / 325 mm
Lift height 15.8 in / 400 mm
Dig depth 18.5 in / 470 mm
Swing System
Boom swing - left (with stop) 55 Degrees / 55 Degrees
Machine swing speed 9 RPM / 9 RPM
Boom swing - left (without stop) 80 Degrees / 80 Degrees
Swing - right 50 Degrees / 50 Degrees
Max digging depth - standard stick 9.7 ft / 2910 mm
Max reach ground level - standard stick 16.9 ft / 5100 mm
Net Power 30 hp / 22 kW
Gross power 31 hp / 23 kW
Bore 3.5 in / 88 mm
Stroke 4.1 in / 103 mm
Displacement 116 in3 / 1.9 L
Engine Mitsubishi S3Q2
Travel System
Travel speed - high 2.8 mph / 4.6 km/h
Travel speed - low 1.6 mph / 2.6 km/h
Max traction force - high speed 3979 lb / 17.7 kN
Max traction force - low speed 7508 lb / 33.4 kN
Gradeability (max) - high 30 Degrees / 30 Degrees
Engine Dimensions
Stroke 4.1 in / 103 mm
Bore 3.5 in / 88 mm
Displacement 116 in3 / 1.9 L
Hydraulic System
Digging force - bucket 7420 lb / 33 kN
Operating pressures - equipment 3553 psi / 245 bar
Operating pressure - travel 3553 psi / 245 bar
Operating pressure - swing 2495 psi / 172 bar
Auxiliary circuit - primary (245 bar, 3550 psi) 15.9 gal/min / 60 L/min
Digging forces - stick (standard) 4250 lb / 18.9 kN
Digging force - stick (long) 3799 lb / 16.9 kN
Auxiliary circuits - Secondary - at 174 bar 7.1 gal/min / 27 L/min
Operating weight with cab 7835 lb / 3555 kg
Operating Weight 7575 lb / 3435 kg
Sound Levels
Cab 82 dB(A) / 82 dB(A)
Canopy 78 dB(A) / 78 dB(A)
Service Refill Capacities
Hydraulic tank 9.8 gal / 37 L
Cooling system 1.6 gal / 6 L
Fuel tank 11.9 gal / 45 L
Hydraulic system 17.2 gal / 65 L
Engine oil 1.6 gal / 6 L

Operating & Safety Information:

Before Operating

Failure to follow warnings or instructions can cause serious injury or death.

  • The Operation and Maintenance Manual, Operator's Handbook, safety manual and machine signs (decals) provide proper operation and maintenance instructions. Study these documents and decals before operating your mini-excavator. Know your machine!

  • Always check the service schedule included on the machine. Your rented mini-excavator has gone through a thorough "Rental-Ready" maintenance procedure, but you should always double check fluid levels before operating your machine. Unless you have made specific arrangements with your local rental company, NEVER perform maintenance on a rented machine. Call your rental dealer with any maintenance questions. Check for leaks, broken or damaged parts before operating.

  • Never smoke when fueling

Always fasten seat belt snugly for restraint and lower the control console.

  • Know the location and function of all safety features and interlocks, gauges and operating controls.

  • Activate the auxiliary hydraulics pedal for hydraulic attachment operation.

Wear proper clothing and use personal protection equipment as required for the job.


Service and repair work should be done only by qualified service personnel.

Know the Worksite

  • Call local utilities before you dig: 1-888-258-0808 (National Referral No.) or see: U.S. & Canada Underground Utility Locater Numbers for your state or provincial number. Know the location of underground gas, water and electrical lines.

  • Inspect work area for holes, drop-offs or unstable ground.

  • Know the weight limitations of operating surfaces and clearances.

Changing and Using Attachments

  • Make sure attachment is securely fastened to excavator.

  • The attachment signs (decals) and Operator's Handbook provide operating and maintenance instructions. Failure to follow warnings and instructions can cause serious injury or death.

  • Use only approved attachments for the compact excavator.

While Operating

  • Start excavator with steering levers and hydraulic controls in neutral. Keep bystanders away.

  • Move steering levers and pedals smoothly. If your mini-excavator has a hydrostatic drive, be aware. Hydrostatic drive systems are responsive. Excavator will move immediately when controls are activated. Check blade location before moving travel control levers or pedals. Excavator will move in the direction of the blade when steering levers are moved away from the operator.

  • Keep your attachment low when traveling.

  • Never carry riders.

  • Do not exceed the rated lift capacity. Read and understand the load rating chart on the excavator.

    Keep bystanders away from the maximum swing area. Never lift a load over another bystander.

  • Always look in the direction of travel before moving the excavator or rotating the house swing (slew).

  • Keep bystanders away from the work area.

  • Do not swing loads on a slope. Swing loads low and slowly. Do not travel across slopes which are more than 15 degrees to the side or to the back of the machine, or 25 degrees to the front. Keep boom centered.

    Keep hands and feet on controls or footrests.

  • Never operate excavator's controls from the ground.

  • Always sit in the operator's seat when activating the controls.

Getting On and Off Safely

Before leaving the excavator:

  1. Lower the attachment to the ground.

  2. Stop the engine.

  3. Remove the key to prevent unauthorized starting.

  • Use the grab-handles, track and skid-resistant surfaces when getting on or off the excavator.

  • Do not jump off the excavator.

Transporting the Excavator and Attachment

  • Always drive up the ramp with heavy end uphill (boom, dipper, etc.).

  • Engage swing lock and secure excavator and attachments using tie-downs and chains. Use towing vehicle and trailer of adequate capacity.