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
Caterpillar 309 CR Mini Excavator General Specifications specifications
Digging Depth
15.30 ft (4.66 m) — Starting 2025 Model Year
Digging Reach
25.10 ft (7.65 m) — Starting 2025 Model Year
Engine
70.30 hp (52.42 kw) — Starting 2025 Model Year
Operating Weight
20,731.00 lbs (9,403.44 kg) — Starting 2025 Model Year
Air Conditioning System
Caterpillar 309 CR Mini Excavator Air Conditioning System specifications
Air Conditioning
The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a (Global Warming Potential = 1430). The system contains 1.0 kg of refrigerant which has a CO2 equivalent of 1.430 metric tonnes.
Blade
Caterpillar 309 CR Mini Excavator Blade specifications
Height
17.00 in (43.18 cm)
Width - Standard
97.20 in (246.89 cm)
Width - Wide
103.90 in (263.91 cm)
Certification - Cab
Caterpillar 309 CR Mini Excavator Certification - Cab specifications
Roll Over Protective Structure (Rops)
ISO 12117-2:2008
Tip Over Protective Structure (Tops)
ISO 12117:1997
Top Guard
ISO 10262:1998 (Level II)
Dimensions - Long Stick
Caterpillar 309 CR Mini Excavator Dimensions - Long Stick specifications
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)
Cab Height
99.00 in (251.46 cm)
Dig Depth
183.10 in (465.07 cm)
Ground Clearance
13.50 in (34.29 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)
Tail Swing With Counterweight
64.80 in (164.59 cm)
Tail Swing Without Counterweight
57.10 in (145.03 cm)
Track Belt/Shoe Width
17.70 in (44.96 cm)
Transport Height
99.00 in (251.46 cm)
Vertical Wall
134.31 in (341.15 cm)
Dimensions - Standard Stick
Caterpillar 309 CR Mini Excavator Dimensions - Standard Stick specifications
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)
Cab Height
99.00 in (251.46 cm)
Dig Depth
162.00 in (411.48 cm)
Ground Clearance
13.50 in (34.29 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
281.11 in (714.02 cm)
Maximum Reach - Ground Level
273.61 in (694.97 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)
Tail Swing With Counterweight
64.80 in (164.59 cm)
Tail Swing Without Counterweight
57.10 in (145.03 cm)
Track Belt/Shoe Width
17.70 in (44.96 cm)
Transport Height
97.90 in (248.67 cm)
Vertical Wall
118.00 in (299.72 cm)
Engine
Caterpillar 309 CR Mini Excavator Engine specifications
Bore
3.70 in (9.40 cm)
Displacement
203.00 cu in (3,326.58 cu cm)
Engine Model
Cat C3.3B
Gross Power - Iso 14396
74.30 hp (55.41 kw)
Net Power
70.30 hp (52.42 kw)
Rated Net Power - 2,200 Rpm - Eu Stage V - Iso 9249/Eec 80/1269
71.50 hp (53.32 kw)
Rated Net Power - 2,200 Rpm - U.S. Epa Tier 4 Final - Iso 9249/Eec 80/1269
70.30 hp (52.42 kw)
Stroke
4.70 in (11.94 cm)
Hydraulic System
Caterpillar 309 CR Mini Excavator Hydraulic System specifications
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
Caterpillar 309 CR Mini Excavator Service Refill Capacities specifications
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)
Sound
Caterpillar 309 CR Mini Excavator Sound specifications
Average Exterior Sound Pressure (Iso 6395:2008)
99 dB(A)
Note
European Union Directive 2000/14/EC
Operator Sound Pressure (Iso 6396:2008)
72 dB(A)
Specifications
Caterpillar 309 CR Mini Excavator Specifications specifications
Note
The 309 CR specifications are based on a machine configured with a Long (L) Undercarriage. For specifications representing a 309 CR with a Standard Undercarriage, please refer to the 308 CR information.
Swing System
Caterpillar 309 CR Mini Excavator Swing System specifications
Machine Swing Speed
10.6 rpm
Travel System
Caterpillar 309 CR Mini Excavator Travel System specifications
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)
Weight Increase From Minimum Configuration
Caterpillar 309 CR Mini Excavator Weight Increase From Minimum Configuration specifications
Counterweight
552.00 lbs (250.38 kg)
Long Stick
146.00 lbs (66.22 kg)
Steel Tracks With Pads
728.00 lbs (330.22 kg)
Weights
Caterpillar 309 CR Mini Excavator Weights specifications
Maximum Operating Weight With Cab**
20,731.00 lbs (9,403.44 kg)
Minimum Operating Weight With Cab*
19,304.00 lbs (8,756.16 kg)
Note (1)
*Minimum Weight is based on steel tracks, no counterweight, operator, full fuel tank, standard stick, blade and no bucket.
Note (2)
**Maximum Weight is based on steel tracks with rubber pads, counterweight, operator, full fuel tank, long stick, blade and no bucket.
Operating Weight
20,731.00 lbs (9,403.44 kg)
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