- Category: Mini Excavators ➔
- Manufacturer: Caterpillar ➔
- Model: 309 CR ➔
The Caterpillar 309 CR Mini Excavator is a powerful and versatile machine designed for various construction and excavation tasks. With a net power of 70.3 hp and a hydraulic system featuring load sensing hydraulics with a variable displacement piston pump, this excavator offers impressive digging forces and operating pressures. Equipped with a long stick boom and standard stick options, as well as a maximum reach of 300.7 inches, this compact excavator is ideal for reaching into tight spaces while maintaining stability. The Caterpillar 309 CR also boasts efficient travel speeds, impressive weight capacities, and comprehensive service refill capacities, making it a reliable choice for any job site.
General Specifications
| Digging Depth ft (m) | 15.3 (4.7)
Starting 2025 Model Year |
| Digging Reach ft. (m) | 25.1 (7.7)
Starting 2025 Model Year |
| Engine | C3.3B
Starting 2021 Model Year |
| Engine hp (kW) | 70.3 (52.4)
Starting 2025 Model Year |
| Max Digging Depth | 182.8 in ft (55.72 m)
Starting 2023 Model Year |
| Net Power | 69.50 hp (51.83 kw)
Starting 2023 Model Year |
| Operating Weight | 21,091.00 lbs (9,566.73 kg)
Starting 2021 Model Year |
| Operating Weight lbs (kg) | 20,731 (9,403.4)
Starting 2025 Model Year |
Blades
| Blade Height | 17.00 in (43.18 cm)
|
Dimensions - Long Stick
| Boom In Reach | 126.60 in (321.56 cm)
|
| Boom Swing - Left | 24.00 in (60.96 cm)
|
| Boom Swing - Right | 37.00 in (93.98 cm)
|
| Dig Depth | 183.10 in (465.07 cm)
|
| Maximum Blade Depth | 26.90 in (68.33 cm)
|
| Maximum Blade Height | 13.50 in (34.29 cm)
|
| Maximum Dig Height | 276.80 in (703.07 cm)
|
| Maximum Dump Clearance | 199.40 in (506.48 cm)
|
| Maximum Reach | 300.70 in (763.78 cm)
|
| Maximum Reach - Ground Level | 293.80 in (746.25 cm)
|
| O/A Shipping Length | 262.30 in (666.24 cm)
|
| O/A Track Width | 97.20 in (246.89 cm)
|
| O/A Undercarriage Length | 126.00 in (320.04 cm)
|
| Stick Length | 92.80 in (235.71 cm)
|
| Swing Bearing - Height | 28.70 in (72.90 cm)
|
| Track Belt/Shoe Width | 17.70 in (44.96 cm)
|
| Vertical Wall | 134.30 in (341.12 cm)
|
Dimensions - Standard Stick
| Boom In Reach | 120.40 in (305.82 cm)
|
| Boom Swing - Left | 24.00 in (60.96 cm)
|
| Boom Swing - Right | 37.00 in (93.98 cm)
|
| Dig Depth | 162.00 in (411.48 cm)
|
| Maximum Blade Depth | 26.90 in (68.33 cm)
|
| Maximum Blade Height | 13.50 in (34.29 cm)
|
| Maximum Dig Height | 264.90 in (672.85 cm)
|
| Maximum Dump Clearance | 187.10 in (475.23 cm)
|
| Maximum Reach | 281.10 in (713.99 cm)
|
| Maximum Reach - Ground Level | 273.60 in (694.94 cm)
|
| O/A Shipping Length | 259.00 in (657.86 cm)
|
| O/A Track Width | 97.20 in (246.89 cm)
|
| O/A Undercarriage Length | 126.00 in (320.04 cm)
|
| Stick Length | 71.80 in (182.37 cm)
|
| Swing Bearing - Height | 28.70 in (72.90 cm)
|
| Track Belt/Shoe Width | 17.70 in (44.96 cm)
|
| Vertical Wall | 118.00 in (299.72 cm)
|
Engine
| Bore | 3.70 in (9.40 cm)
|
| Displacement | 203.00 cu in (3,326.58 cu cm)
|
| Engine Model | Cat C3.3B
|
| Net Power | 70.30 hp (52.42 kw)
|
| Stroke | 4.70 in (11.94 cm)
|
Hydraulic System
| Auxiliary Circuit - Secondary - Flow | 9.00 gpm (34.07 lpm)
|
| Auxiliary Circuit - Secondary - Pressure | 4134 psi
|
| Digging Force - Bucket | 13,943.00 lbs (6,324.45 kg)
|
| Digging Force - Stick - Long | 8,023.00 lbs (3,639.18 kg)
|
| Digging Force - Stick - Standard | 9,500.00 lbs (4,309.13 kg)
|
| Hydraulic System Type | Load Sensing Hydraulics with Variable Displacement Piston Pump
|
| Operating Pressure - Equipment | 4134 psi
|
| Operating Pressure - Swing | 3626 psi
|
| Operating Pressure - Travel | 4134 psi
|
| Pump Flow at 2,400 rpm | 62.00 gpm (234.67 lpm)
|
Service Refill Capacities
| Cooling System | 2.60 gal (9.84 l)
|
| Engine Oil | 3.00 gal (11.36 l)
|
| Fuel Tank | 39.00 gal (147.62 l)
|
| Hydraulic System | 28.00 gal (105.98 l)
|
| Hydraulic Tank | 14.00 gal (52.99 l)
|
Swing System
| Machine Swing Speed | 10.6 rpm
|
Travel System
| Gradeability - Maximum | 30 degrees
|
| Ground Pressure - Maximum Weight | 6 psi
|
| Ground Pressure - Minimum Weight | 6 psi
|
| Maximum Traction Force - High Speed | 6,497.00 lbs (2,946.99 kg)
|
| Maximum Traction Force - Low Speed | 19,064.00 lbs (8,647.30 kg)
|
| Travel Speed - High | 3.10 mph (4.99 kph)
|
| Travel Speed - Low | 1.60 mph (2.57 kph)
|
Weights
| Operating Weight | 20,731.00 lbs (9,403.44 kg)
|
