308 CR (Fixed Boom)
308 CR (Fixed Boom) Mini Hydraulic Excavator
The 308 CR (Fixed Boom) Mini Excavator delivers power and performance in an 8 ton size class to help you work in a wide range of applications. The Variable Angle Boom provides even greater machine versatility.
DESCRIPTION
The Cat® 308 CR Mini Excavator delivers maximum power and performance in a mini size to help you work in a wide range of applications.ALL DAY COMFORT
- A sealed and pressurized cab is equipped with an improved air conditioning system, adjustable wrist rests and a suspension seat to help keep you working comfortably all day long.
EASY TO OPERATE
- Controls are easy to use and the intuitive Next Generation Monitor provides customizable machine operator preferences and easy to read machine information.
STICK STEER TRAVEL MODE
- Moving around the job site is even easier with Cat Stick Steer. Easily switch from traditional travel controls with levers and pedals to joystick controls with a push of a button. The benefit of less effort and improved control is in your hands!
BIG PERFORMANCE IN A MINI DESIGN
- Increased lifting, swinging, travel and multi-functioning performance help you get the job done more efficiently, and blade float allows for easy clean up.
SAFETY ON THE JOB SITE
- Your safety is our top priority. The Cat mini excavator is designed to help keep you safe on the job. A back-up camera, courtesy work lights and a fluorescent retractable seat belt are just a few of the safety features we’ve built into the machine.
SIMPLE SERVICE FOR LESS DOWNTIME
- Maintenance is quick and easy on the Cat mini excavator. Routine check points are easy to access at ground level with grouped service points and robust service panels.
LOWER OPERATING COSTS
- Equipped with features such as auto idle, auto engine shutdown, and efficient hydraulics with a variable displacement pump, the Cat mini excavator was designed with reducing your operating costs in mind.
UNMATCHED DEALER SUPPORT
- Your Cat dealer is here to help you reach your business goals. From providing equipment solutions to operator training to service needs and beyond, your Cat dealer is ready to help.
SUSTAINABILITY
- The Cat® C3.3B engine meets U.S. EPA Tier 4 Final, EU Stage V, and Japan 2014 emission standards.
- Cat diesel engines are required to use ULSD (ultra-low sulfur diesel fuel with 15 ppm of sulfur or less) or ULSD blended with the following lower-carbon intensity fuels up to: 20% biodiesel FAME (fatty acid methyl ester) * or 100% renewable diesel, HVO (hydrotreated vegetable oil) and GTL (gas-to-liquid) fuels. Refer to guidelines for successful application. Please consult your Cat dealer or “Caterpillar Machine Fluids Recommendations” (SEBU6250) for details.
- Auto Idle helps reduce unnecessary fuel burn and greenhouse gas emissions by allowing the engine to automatically go into idle mode when the machine is not working.
- Engine Idle Shutdown Timer reduces fuel burn, greenhouse gas emissions and unnecessary idle time by shutting down the machine after a pre-set idling period.
- Cruise control helps you maintain a constant speed as you travel across your jobsite saving fuel and reducing greenhouse gas emissions.
- The Cat® Seat Belt Reminder provides audible and visual warnings to remind operators to buckle up during machine operation. The easy-to-install system is compatible with all equipment brands to help ensure operator safety.
- Extended maintenance intervals not only reduce downtime but decrease the amount of fluid and filters that are replaced over the life of the machine.
- Remote Flash minimizes downtime and maintenance time while keeping your asset running with maximum efficiency. Alerts for machine updates are sent virtually from your Cat dealer and updates can be deployed without a dealer technician needing to be onsite.(if equipped)
- Remote Troubleshoot decreases maintenance time and keeps your machine running with maximum efficiency by allowing your Cat dealer to virtually test the machine while working. Once a problem is identified, a technician can fix it the first time, saving time and money.(if equipped)
- Cat Grade with advanced 2D and 3D technologies combine advanced guidance with optional automated machine control helping you reach grading targets while reducing fuel burn and greenhouse gas emissions by improving efficiency, job site productivity, and accuracy. (if equipped).
- Specs
- Docs
Specs
Overview
Long Name:
308 CR (Fixed Boom) Mini Hydraulic Excavator
Name:
308 CR (Fixed Boom)
Brand:
Cat
Status:
Current
Engine
Net Power
69 hp / 51.2 kW
Engine Model
Cat® C2.8 Turbo
Net Power - 2,400 rpm - ISO 9249, 80/1269/EEC
69 hp / 51.2 kW
Gross Power - ISO 14396
74.3 hp / 55.4 kW
Bore
3.5 in / 90 mm
Stroke
4.3 in / 110 mm
Displacement
171 in³ / 2.8 l
Note
Meets U.S. EPA Tier 4 Final and EU Stage V emissions standards.
Note (1)
Advertised power is tested per the specified standard in effect at the time of manufacture.
Note (2)
Net power advertised is the power available at the flywheel when the engine is at the rated speed of 2,400 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
18659 lb / 8462 kg
Minimum Operating Weight with Cab*
16707 lb / 7577 kg
Maximum Operating Weight with Cab**
18659 lb / 8462 kg
Note (1)
*Minimum Weight is based on rubber 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.
Weight Increase from Minimum Configuration
Counterweight
551 lb / 250 kg
Long Stick
187 lb / 85 kg
Steel Tracks with Pads
662 lb / 300 kg
Travel System
Travel Speed - High
3 mile/h / 4.9 km/h
Travel Speed - Low
1.8 mile/h / 3 km/h
Maximum Traction Force - High Speed
6587 lbf / 29.3 kN
Maximum Traction Force - Low Speed
15962 lbf / 71 kN
Ground Pressure - Minimum Weight
4.8 psi / 33.2 kPa
Ground Pressure - Maximum Weight
5.4 psi / 37.9 kPa
Gradeability - Maximum
30 degrees
Service Refill Capacities
Cooling System
2.6 gal (US) / 10 l
Engine Oil
2.3 gal (US) / 8.8 l
Fuel Tank
38 gal (US) / 145 l
Hydraulic Tank
14 gal (US) / 53 l
Hydraulic System
29 gal (US) / 110 l
Hydraulic System
Type
Load Sensing Hydraulics with Variable Displacement Piston Pump
Pump Flow at 2,400 rpm
44 gpm / 167 L/min
Operating Pressure - Equipment
4134 psi / 285 bar
Operating Pressure - Travel
4134 psi / 285 bar
Operating Pressure - Swing
3626 psi / 250 bar
Maximum Auxiliary Circuit - Primary - Flow at Pump
35 gpm / 131 L/min
Maximum Auxiliary Circuit - Primary - Pressure at Pump
4134 psi / 285 bar
Maximum Auxiliary Circuit - Secondary - Flow at Pump
9 gpm / 33 L/min
Maximum Auxiliary Circuit - Secondary - Pressure at Pump
4134 psi / 285 bar
Digging Force - Stick - Standard
9285 lbf / 41.3 kN
Digging Force - Stick - Long
8250 lbf / 36.7 kN
Digging Force - Bucket
13241 lbf / 58.9 kN
Note
Flow and pressure are not combinable. Under load, as flow rises pressure goes down.
Swing System
Machine Swing Speed
10 r/min / 10 r/min
Blade
Width - Standard
90.6 in / 2300 mm
Width - Wide
96.5 in / 2450 mm
Height
17 in / 431 mm
Certification - Cab
Roll Over Protective Structure (ROPS)
ISO 12117-2:2008
Top Guard
ISO 10262:1998 (Level I)
Dimensions - Standard Stick
Dig Depth
163 in / 4145 mm
Vertical Wall
142 in / 3600 mm
Maximum Reach - Ground Level
246 in / 6246 mm
Maximum Reach
252 in / 6391 mm
Maximum Dig Height
291 in / 7392 mm
Maximum Dump Clearance
207 in / 5255 mm
Boom In Reach
66 in / 1681 mm
Tail Swing with Counterweight
56 in / 1425 mm
Tail Swing without Counterweight
51 in / 1290 mm
Maximum Blade Height
14.6 in / 370 mm
Maximum Blade Depth
16 in / 407 mm
Height - Boom Transport - No Tools*
97 in / 2466 mm
Height - Boom Working - With Tools**
105 in / 2671 mm
Cab Height
100 in / 2541 mm
Swing Bearing - Height
30 in / 756 mm
O/A Undercarriage Length
113 in / 2880 mm
Overall Shipping Length - with Counterweight
228 in / 5780 mm
Overall Shipping Length - without Counterweight
222 in / 5645 mm
Track Belt/Shoe Width
18 in / 450 mm
O/A Track Width
91 in / 2300 mm
Ground Clearance
14 in / 350 mm
Stick Length
66 in / 1665 mm
Note
*Boom Height when stick is pinned in transport position with no attachments.
Note (1)
**Boom Height when stick is pinned in working position with attachments Standard Stick offers only one pin position.
Note (2)
***With blade positioned at the rear of the machine.
Dimensions - Long Stick
Dig Depth
185 in / 4687 mm
Vertical Wall
162 in / 4110 mm
Maximum Reach - Ground Level
266 in / 6766 mm
Maximum Reach
272 in / 6900 mm
Maximum Dig Height
307 in / 7809 mm
Maximum Dump Clearance
223 in / 5672 mm
Boom In Reach
89 in / 2250 mm
Tail Swing with Counterweight
56 in / 1425 mm
Tail Swing without Counterweight
51 in / 1290 mm
Maximum Blade Height
14.6 in / 370 mm
Maximum Blade Depth
16 in / 407 mm
Height - Boom Transport - No Tools*
100 in / 2540 mm
Height - Boom Working - With Tools**
121 in / 3080 mm
Cab Height
100 in / 2541 mm
Swing Bearing - Height
30 in / 756 mm
O/A Undercarriage Length
113 in / 2880 mm
Overall Shipping Length - with Counterweight
5800 mm (228 in)***
Overall Shipping Length - without Counterweight
5665 mm (223 in)***
Track Belt/Shoe Width
18 in / 450 mm
O/A Track Width
91 in / 2300 mm
Ground Clearance
14 in / 350 mm
Stick Length
87 in / 2208 mm
Note
*Boom Height when stick is pinned in transport position with no attachments.
Note (1)
**Boom Height when stick is pinned in working position with attachments. Standard Stick offers only one pin position.
Note (2)
***With blade positioned at the rear of the machine.
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)
72 dB(A) / 72 dB(A)
Average Exterior Sound Pressure (ISO 6395:2008)
99 dB(A) / 99 dB(A)
Note
European Union Directive "2000/14/EC"
Sustainability
Recyclability
96%
- 308 CR (Fixed Boom) Mini Excavator Product Brochure (pdf)
- Cat Mini Hydraulic Excavators Product Line Brochure (North America) (pdf)
- Cat Mini Hydraulic Excavators Product Line Brochure (Europe) (pdf)
- Options And Accessories Kit Guide for Mini Hydraulic Excavators (pdf)
- Cat Attachments for Mini Excavators Brochure (pdf)
- Attachment Compatibility Guide for Mini Excavators (pdf)
SEE HOW 308 CR (Fixed Boom) COMPARES AGAINST FREQUENTLY COMPARED PRODUCTS.
Mini Excavators
308 CR (Fixed Boom)
- Brand
- Cat
- Status
- Current
- Net Power
- 69 hp / 51.2 kW
- Bore
- 3.5 in / 90 mm
- Stroke
- 4.3 in / 110 mm
- Displacement
- 171 in³ / 2.8 l
- Note
- European Union Directive "2000/14/EC"
- Note (1)
- **Boom Height when stick is pinned in working position with attachments. Standard Stick offers only one pin position.
- Note (2)
- ***With blade positioned at the rear of the machine.
- Operating Weight
- 18659 lb / 8462 kg
- Counterweight
- 551 lb / 250 kg
- Steel Tracks with Pads
- 662 lb / 300 kg
- Travel Speed - High
- 3 mile/h / 4.9 km/h
- Travel Speed - Low
- 1.8 mile/h / 3 km/h
- Maximum Traction Force - High Speed
- 6587 lbf / 29.3 kN
- Maximum Traction Force - Low Speed
- 15962 lbf / 71 kN
- Ground Pressure - Minimum Weight
- 4.8 psi / 33.2 kPa
- Ground Pressure - Maximum Weight
- 5.4 psi / 37.9 kPa
- Gradeability - Maximum
- 30 degrees
- Cooling System
- 2.6 gal (US) / 10 l
- Engine Oil
- 2.3 gal (US) / 8.8 l
- Fuel Tank
- 38 gal (US) / 145 l
- Hydraulic Tank
- 14 gal (US) / 53 l
- Hydraulic System
- 29 gal (US) / 110 l
- Type
- Load Sensing Hydraulics with Variable Displacement Piston Pump
- Pump Flow at 2,400 rpm
- 44 gpm / 167 L/min
- Operating Pressure - Equipment
- 4134 psi / 285 bar
- Operating Pressure - Travel
- 4134 psi / 285 bar
- Operating Pressure - Swing
- 3626 psi / 250 bar
- Maximum Auxiliary Circuit - Primary - Flow at Pump
- 35 gpm / 131 L/min
- Maximum Auxiliary Circuit - Primary - Pressure at Pump
- 4134 psi / 285 bar
- Maximum Auxiliary Circuit - Secondary - Flow at Pump
- 9 gpm / 33 L/min
- Maximum Auxiliary Circuit - Secondary - Pressure at Pump
- 4134 psi / 285 bar
- Digging Force - Stick - Standard
- 9285 lbf / 41.3 kN
- Digging Force - Bucket
- 13241 lbf / 58.9 kN
- Machine Swing Speed
- 10 r/min / 10 r/min
- Width - Standard
- 90.6 in / 2300 mm
- Width - Wide
- 96.5 in / 2450 mm
- Height
- 17 in / 431 mm
- Roll Over Protective Structure (ROPS)
- ISO 12117-2:2008
- Top Guard
- ISO 10262:1998 (Level I)
- Dig Depth
- 185 in / 4687 mm
- Vertical Wall
- 162 in / 4110 mm
- Maximum Reach
- 272 in / 6900 mm
- Maximum Dig Height
- 307 in / 7809 mm
- Maximum Dump Clearance
- 223 in / 5672 mm
- Tail Swing with Counterweight
- 56 in / 1425 mm
- Tail Swing without Counterweight
- 51 in / 1290 mm
- Maximum Blade Height
- 14.6 in / 370 mm
- Maximum Blade Depth
- 16 in / 407 mm
- Cab Height
- 100 in / 2541 mm
- Track Belt/Shoe Width
- 18 in / 450 mm
- Ground Clearance
- 14 in / 350 mm
- Stick Length
- 87 in / 2208 mm
- 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).
- Operator Sound Pressure (ISO 6396:2008)
- 72 dB(A) / 72 dB(A)
- Average Exterior Sound Pressure (ISO 6395:2008)
- 99 dB(A) / 99 dB(A)
- Recyclability
- 96%
Selected Model
Mini Excavators
308 CR
- Brand
- Caterpillar
- Status
- Current
- Net Power
- 69.5 hp / 51.8 kW
- Bore
- 3.7 in / 94 mm
- Stroke
- 4.7 in / 120 mm
- Displacement
- 203 in³ / 3.33 l
- Note
- *Boom Height when stick is pinned in transport position with no attachments.
- Note (1)
- **Boom Height when stick is pinned in working position with attachments. Standard Stick offers only one pin position.
- Note (2)
- ***With blade positioned at the rear of the machine.
- Operating Weight
- 18493 lb / 8387 kg
- Counterweight
- 552 lb / 250 kg
- Steel Tracks with Pads
- 752 lb / 341 kg
- Travel Speed - High
- 3.2 mile/h / 5.1 km/h
- Travel Speed - Low
- 1.9 mile/h / 3.1 km/h
- Maximum Traction Force - High Speed
- 6250 lbf / 27.8 kN
- Maximum Traction Force - Low Speed
- 15175 lbf / 67.5 kN
- Ground Pressure - Minimum Weight
- 4.9 psi / 33.8 kPa
- Ground Pressure - Maximum Weight
- 5.5 psi / 37.6 kPa
- Gradeability - Maximum
- 30 degrees
- Cooling System
- 2.6 gal (US) / 10 l
- Engine Oil
- 3 gal (US) / 11.2 l
- Fuel Tank
- 39 gal (US) / 147 l
- Hydraulic Tank
- 14 gal (US) / 53 l
- Hydraulic System
- 29 gal (US) / 110 l
- Type
- Load Sensing Hydraulics with Variable Displacement Piston Pump
- Pump Flow at 2,400 rpm
- 44 gpm / 167 L/min
- Operating Pressure - Equipment
- 4134 psi / 285 bar
- Operating Pressure - Travel
- 4134 psi / 285 bar
- Operating Pressure - Swing
- 3626 psi / 250 bar
- Maximum Auxiliary Circuit - Primary - Flow at Pump
- 35 gpm / 131 L/min
- Maximum Auxiliary Circuit - Primary - Pressure at Pump
- 4134 psi / 285 bar
- Maximum Auxiliary Circuit - Secondary - Flow at Pump
- 9 gpm / 33 L/min
- Maximum Auxiliary Circuit - Secondary - Pressure at Pump
- 4134 psi / 285 bar
- Digging Force - Stick - Standard
- 9509 lbf / 42.3 kN
- Digging Force - Bucket
- 13946 lbf / 62 kN
- Machine Swing Speed
- 10.6 r/min / 10.6 r/min
- Width - Standard
- 90.6 in / 2300 mm
- Width - Wide
- 96.5 in / 2450 mm
- Height
- 17 in / 431 mm
- Roll Over Protective Structure (ROPS)
- ISO 12117-2:2008
- Top Guard
- ISO 10262:1998 (Level I)
- Dig Depth
- 182.8 in / 4643 mm
- Vertical Wall
- 134 in / 3404 mm
- Maximum Reach
- 300.7 in / 7637 mm
- Maximum Dig Height
- 277.1 in / 7039 mm
- Maximum Dump Clearance
- 199.7 in / 5072 mm
- Tail Swing with Counterweight
- 62.4 in / 1585 mm
- Tail Swing without Counterweight
- 57.1 in / 1450 mm
- Maximum Blade Height
- 14.6 in / 370 mm
- Maximum Blade Depth
- 16 in / 407 mm
- Cab Height
- 100 in / 2541 mm
- Track Belt/Shoe Width
- 17.7 in / 450 mm
- Ground Clearance
- 13.8 in / 350 mm
- Stick Length
- 92.8 in / 2358 mm
- 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.
- Operator Sound Pressure (ISO 6396:2008)
- 72 dB(A) / 72 dB(A)
- Average Exterior Sound Pressure (ISO 6395:2008)
- 99 dB(A) / 99 dB(A)
- Recyclability
- 96%
Mini Excavators
308 CR VAB
- Brand
- Caterpillar
- Status
- Current
- Net Power
- 69.5 hp / 51.8 kW
- Bore
- 3.7 in / 94 mm
- Stroke
- 4.7 in / 120 mm
- Displacement
- 203 in³ / 3.33 l
- Note
- European Union Directive "2000/14/EC"
- Note (1)
- *Minimum Weight is based on rubber tracks, no counterweight, operator, full fuel tank, blade, and no bucket.
- Note (2)
- **Maximum Weight is based on steel tracks with rubber pads, counterweight, operator, full fuel tank, blade, and no bucket.
- Operating Weight
- 20385 lb / 9245 kg
- Counterweight
- 552 lb / 250 kg
- Steel Tracks with Pads
- 752 lb / 341 kg
- Travel Speed - High
- 3.2 mile/h / 5.1 km/h
- Travel Speed - Low
- 1.9 mile/h / 3.1 km/h
- Maximum Traction Force - High Speed
- 6250 lbf / 27.8 kN
- Maximum Traction Force - Low Speed
- 15175 lbf / 67.5 kN
- Ground Pressure - Minimum Weight
- 5.5 psi / 37.9 kPa
- Ground Pressure - Maximum Weight
- 5.9 psi / 40.6 kPa
- Gradeability - Maximum
- 30 degrees
- Cooling System
- 2.6 gal (US) / 10 l
- Engine Oil
- 3 gal (US) / 11.2 l
- Fuel Tank
- 39 gal (US) / 147 l
- Hydraulic Tank
- 14 gal (US) / 53 l
- Hydraulic System
- 29 gal (US) / 110 l
- Type
- Load Sensing Hydraulics with Variable Displacement Piston Pump
- Pump Flow at 2,400 rpm
- 44 gpm / 167 L/min
- Operating Pressure - Equipment
- 4134 psi / 285 bar
- Operating Pressure - Travel
- 4134 psi / 285 bar
- Operating Pressure - Swing
- 3626 psi / 250 bar
- Maximum Auxiliary Circuit - Primary - Flow at Pump
- 35 gpm / 131 L/min
- Maximum Auxiliary Circuit - Primary - Pressure at Pump
- 4134 psi / 285 bar
- Maximum Auxiliary Circuit - Secondary - Flow at Pump
- 9 gpm / 33 L/min
- Maximum Auxiliary Circuit - Secondary - Pressure at Pump
- 4134 psi / 285 bar
- Digging Force - Stick - Standard
- 9509 lbf / 42.3 kN
- Digging Force - Bucket
- 13946 lbf / 62 kN
- Machine Swing Speed
- 10.6 r/min / 10.6 r/min
- Width - Standard
- 90.6 in / 2300 mm
- Width - Wide
- 96.5 in / 2450 mm
- Height
- 17 in / 431 mm
- Roll Over Protective Structure (ROPS)
- ISO 12117-2:2008
- Top Guard
- ISO 10262:1998 (Level II)
- Dig Depth
- 136.2 in / 3460 mm
- Vertical Wall
- 146.7 in / 3725 mm
- Maximum Reach
- 310.4 in / 7885 mm
- Maximum Dig Height
- 322 in / 8180 mm
- Maximum Dump Clearance
- 247.4 in / 6285 mm
- Tail Swing with Counterweight
- 62.4 in / 1585 mm
- Tail Swing without Counterweight
- 57.1 in / 1450 mm
- Maximum Blade Height
- 14.6 in / 370 mm
- Maximum Blade Depth
- 16 in / 407 mm
- Cab Height
- 100 in / 2541 mm
- Track Belt/Shoe Width
- 17.7 in / 450 mm
- Ground Clearance
- 13.8 in / 350 mm
- Stick Length
- 71.7 in / 1820 mm
- 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.
- Operator Sound Pressure (ISO 6396:2008)
- 72 dB(A) / 72 dB(A)
- Average Exterior Sound Pressure (ISO 6395:2008)
- 99 dB(A) / 99 dB(A)
- Recyclability
- 96%