Caterpillar 308C CR Hydraulic Excavator
The 308C CR offers a compact radius and improved performance, versatility and styling.
Key Features
Compact Radius
The 308C CR features a compact radius, making it ideal for working in urban construction where space is often restricted. Its shorter tail swing radius reduces the risk of damage to the rear of the machine during operation. The shorter tail measurement allows the excavator to work productively in urban construction, on logging roads, and other space-restricted sites.
Dimensions:
- Front Swing From Center (1665 mm stick): 1660 mm
- Front Swing From Center (2210 mm stick): 2180 mm
- Rear Swing From Center: 1290 mm
- Overhang (450 mm shoes): 130 mm
- Overhang (600 mm shoes): 55 mm
- Width (1665 mm stick): 2950 mm
- Width (2210 mm stick): 3470 mm
Front Linkage
Designed for maximum flexibility to keep productivity high on all jobs. The front linkage allows the use of one boom and two sticks for maximum productivity on a wide range of jobs.
- One-Piece Boom: Features a fabricated box-section design with robotic welding and high-tensile strength steel for durability.
- Sticks: Two stick attachments are available: a long stick for maximum reach or a medium stick for versatility. Both use a box-section design of high tensile-strength steel.
- Linkage Bearings: Self-lubricated, sintered bearings extend greasing intervals by reducing pin friction.
- Linkage Pins: High-stress parts feature a thick chrome finish for maximum durability.
Hydraulics
Hydraulics deliver power and precise control to keep material moving at high volume.
- Open-center, two-pump system: Provides high efficiency and reliability. Pump flow control improves fuel efficiency, ensures smooth control, reduces sound levels, and extends component life.
- Hydraulic Cross-Sensing System: Utilizes main hydraulic pumps to 100% of engine power for faster implement speeds and pivot turns.
- Flow Control System: Pump flow decreases when controls are neutral, reducing fuel consumption and sound levels.
- Stick Regeneration Circuit: Saves energy, providing shorter cycle times and lower operating costs.
- Boom Drift Reducing Valve: Reduces boom drift, keeping lifted material suspended.
- Auxiliary Hydraulic Valve: Standard for use with optional hydraulic circuits.
- Stackable Valves: Allow additional tools to be added.
- Auxiliary Hydraulic Arrangements: Single, double, or combined function circuits are available.
- Hydraulic Cylinder Snubbers: Cushion shocks and reduce sound levels at cylinder ends.
Engine
The four-cylinder engine is built for power, reliability, economy, and low emissions.
- Mitsubishi 4M40-E1 Engine: Developed for construction equipment, featuring a long-stroke piston for high torque at medium to low speeds, excellent fuel efficiency, and low sound levels.
- Low Fuel Consumption: Offers reduced fuel consumption and improved thermal efficiency.
- Cylinder Block and Head: Cast iron block for wear resistance; laser-hardened upper part to reduce oil consumption and piston ring scuffing. Aluminum alloy cylinder heads with water directors for efficient cooling.
- Pistons and Rings: Heat-resistant aluminum alloy pistons with clearance control struts for high combustion efficiency. Three-ring piston set for maximum wear resistance.
- Crankshaft and Connecting Rod: Induction-hardened crankshaft journals and pins; forged connecting rods of high tensile strength steel alloy.
- Cooling System: Large-diameter fan and water-cooled cylinders prevent overheating and ensure longer engine life.
- Lubrication System: High-efficiency external gear-type oil pump with a large oil filter.
- Starting System: Standard 3.2 kW starting motor and two 100-AH batteries allow starting at -32°C with glow plugs.
Undercarriage and Blade
Durable undercarriage absorbs stresses and provides excellent stability.
- Undercarriage Design: Standard undercarriage with high reliability, similar to the 307C.
- Grease-Lubricated Track: Seals protect the track link and provide longer wear life.
- Roller Lubrication: Closed rollers, sprockets, and idler joints with floating seals prevent water and dirt entry.
- Master Pin: Split-pin type for easier track attachment and removal.
- Carbody and Track Roller Frame: X-shaped, box-section carbody for high rigidity; pentagonal section track frame for strength and long service life. Robotic welding ensures continuous, high-quality welds.
- Travel Motors: Automatic speed selection for smooth shifting. An "anti-hunt" feature eliminates hunting during auto shifting.
- Travel Motor Routing: Motors routed along the rear of the carbody for protection.
- Travel Brake Valves: Improved counterbalance valve eliminates sudden starts and stops. A cross-over relief valve reduces shocks during acceleration and deceleration.
- Idler Guard: Integral guard maintains track alignment.
- Segment-type Rubber Track (Optional): Prevents damage to concrete and road surfaces.
- Blades: Two widths available. Bolt-on cutting edges are replaceable and reversible. Mesh bearings in blade cylinder pin joints extend greasing intervals.
Operator Station
Designed for simple, easy operation, the 308C CR allows the operator to focus on production.
- Cab Design: Enlarged cab with curved styling for a comfortable, spacious working environment and improved visibility.
- Seat: Low-back seat slides forward and backward independently of consoles for adjustment.
- Sliding Door: Cab door slides alongside for less opening space, allowing easy entry/exit in tight quarters.
- Consoles: Redesigned for simple, functional design with adjustable armrests.
- Monitor: Conveniently located monitor displays gauges and indicators clearly.
- Cab Mounts: Viscous rubber cab mounts dampen vibrations and sound.
- Travel Control Levers: Reverse-L shape for easier operation, with adjusted lever stroke and force for fine control.
- Hydraulic Activation Control Lever: Safety feature requiring lock position before operator can leave the cab.
- Climate Control: Fully automatic climate control adjusts temperature and flow.
- Windows: Glass attached directly to the frame for improved visibility. Upper front window is laminated glass for protection from falling objects. Enlarged skylight with sunshade improves overhead visibility.
- Windshield: Front windshield opens and closes with a one-touch action release system.
Serviceability
Simplified service and maintenance save you time and money.
- Extended Service Intervals: Oil-free bearings extend front linkage greasing interval to 1,000 hours.
- Ground-Level Maintenance: Daily maintenance areas are easily reached from ground level.
- Fan Guard: Enclosed by fine wire mesh to reduce injury risk.
- DT Electrical Connectors: Water- and vibration-resistant for improved electrical system reliability.
- Radiator and Pump Compartment: Engine hood opens for easy access to radiator and oil cooler.
- Air Filter: Cat radial seal for superior cleaning efficiency.
- Engine Inspection: Engine accessed from upper structure or under machine. Gas cylinder-assist mechanism for easy hood opening. Steel wall separates engine and pump compartments.
- Engine Maintenance: Oil level gauge, oil filter, fuel filter, and priming pump grouped for easier servicing.
- Fuel Tank: Drain cock at the bottom for easier water and sediment removal.
- Fuel-Water Separator: Primary fuel filter element located in the radiator compartment for easy ground access.
- Storage Box: Lockable storage box located at the right front of the upper structure for tools and repair equipment.
Complete Customer Support
Cat dealer services help you operate longer with lower costs.
- Services: Caterpillar offers a wide range of services under a Customer Support Agreement, covering the entire machine and work tools for optimal investment return.
- Product Support: Access to parts requirements through a worldwide network. Alternative solutions like Reman, Classic Parts, and used parts are available.
- Service Capability: Highly trained service technicians using the latest technology and tools, available in dealer shops or in the field.
- Maintenance: Planning for effective maintenance with a wide range of services available at the time of purchase. Repair option programs and diagnostic programs (S•O•SSM Fluid analysis, Technical Analysis) help avoid unscheduled repairs.
- Selection: Detailed machine comparisons and information on component lifespan and preventive maintenance costs are available from Cat dealers.
- Purchase: Consider financing options and dealer services to yield lower equipment and operating costs.
- Operation: Improving operating techniques can boost profits with training material and ideas from Cat dealers.
- Replacement: Dealers can help evaluate costs for repair, rebuild, or replacement decisions.
Buckets, Quick Couplers and Work Tools
The 308C CR has designed-in flexibility to help bring total solutions for efficiency to your jobs.
- Quick Couplers: Enable quick tool exchange. Caterpillar offers CW-Series Dedicated Quick Couplers (hydraulic and spindle versions) and Pin Grabber Plus Quick Couplers.
- Buckets: A variety of buckets optimize machine performance, designed and built to Caterpillar's high durability standards. Types include Excavation Bucket, Extreme Excavation Bucket, and Ditch Cleaning Bucket.
- Work Tools: Available through Caterpillar Work Tools & Services and Caterpillar Impact Products. Options include Shears (S305), Multi-Grapples (VRG10), and Hammers (H70, H90C).
Bucket Specifications:
| Excavation | Extreme Excavation | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 300 mm | 450 mm | 600 mm | 750 mm | 850 mm | 300 mm | 450 mm | 600 mm | 750 mm | 800 mm | |
| A Bite width (mm) | 300 | 450 | 600 | 750 | 850 | 300 | 450 | 600 | 750 | 800 |
| B Tip radius (mm) | 1070 | 1070 | 1070 | 1070 | 1070 | 1070 | 1070 | 1070 | 1070 | 1070 |
| Capacity (m³) | 0.09 | 0.16 | 0.23 | 0.30 | 0.35 | 0.09 | 0.16 | 0.23 | 0.30 | 0.33 |
| Weight (kg) | 141 | 168 | 191 | 208 | 222 | 146 | 174 | 197 | 228 | 242 |
Specifications
Engine
- Engine: 4M40-E1
- Gross Power: 41 kW/55 hp
- Net Power (ISO 9249, EEC 80/1269): 41 kW/54 hp
- Bore: 95 mm
- Stroke: 100 mm
- Displacement: 2.8 liters
- Cylinders: 4
- Note: Net power is power available at the flywheel with fan, air cleaner, muffler, and alternator. No engine derating required below 2300 m altitude. Meets Stage II EU Emission Directive 97/68/EC.
Hydraulic System
- Main Implement System Maximum Flow (2x): 64 l/min
- Maximum Pressure (Implements): 27 460 kPa
- Travel Maximum Flow: 31 380 kPa
- Swing Maximum Flow: 24 030 kPa
- Pilot System Maximum Flow: 18.7 l/min
- Pilot System Maximum Pressure: 4120 kPa
- Stick Cylinder Bore: 90 mm
- Stick Cylinder Stroke: 932 mm
- Stick Cylinder Maximum Flow: 34 l/min
- Stick Cylinder Maximum Pressure: 20 600 kPa
- Boom Cylinder Bore: 110 mm
- Boom Cylinder Stroke: 985 mm
Sound
- Operator Sound: 73 dB(A) (ISO 6396) with doors and windows closed.
- Exterior Sound: 100 dB(A) (2000/14/EC)
Cab/FOGS
- Meets ISO 10262
Drive
- Maximum Travel Speed: 5.3 km/h
- Maximum Drawbar Pull: 57 kN
Swing Mechanism
- Swing Speed: 11.5 rpm
- Swing Torque: 16 kNm
Operating Weight
- With one-piece boom, long stick, 600 mm shoes, 0.3 m³ bucket and 2470 mm blade: 8040 kg
Service Refill Capacities
| Liters | |
|---|---|
| Fuel Tank | 115 |
| Cooling System | 15 |
| Engine Oil | 10 |
| Swing Drive | 1.5 |
| Final Drive (each) | 1.3 |
| Hydraulic system (including tank) | 92 |
| Hydraulic tank | 55 |
Track
Caterpillar designed and built track-type undercarriage and track shoes.
| Ground Pressure | |
|---|---|
| Standard triple grouser shoes (450 mm) | 32.4 kPa |
| Optional triple grouser shoes (600 mm) | 24.9 kPa |
| Optional rubber track shoes (450 mm) | 32.6 kPa |
Additional Weights
| kg | |
|---|---|
| Standard operating weights with 1665 mm stick and 450 mm shoes | 7430 |
| Standard operating weights with 2210 mm stick and 450 mm shoes | 7470 |
| Optional operating weights with 1665 mm stick and 600 mm shoes | 7600 |
| Optional operating weights with 2210 mm stick and 600 mm shoes | 7650 |
| Blade (2320 mm) | 380 |
| Blade (2470 mm) | 390 |
| 450 mm segmented rubber track | 23 |
Dimensions
All dimensions are approximate. Machine dimensions with 3700 mm one-piece boom and 1665 mm stick.
| mm | mm | ||
|---|---|---|---|
| A Shipping height | 2610 | E Track length | 2910 |
| B Shipping length | *2740 / *5830 / *5850 | F Track shoe width | 450/600 |
| C Tail swing radius | 1290 | G Ground clearance | 384 |
| D Length to centers of rollers | 2280 | H Track gauge | 1870 |
| J Transport width (450 mm shoes) | 2320 | ||
| J Transport width (600 mm shoes) | 2470 |
Working Ranges
With One-piece boom.
| Stick (mm) | 1655 | 2210 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| A Max Digging Depth | B Max Reach at Ground Level | C Max Cutting Height | D Max Loading Height | E Min Loading Height | F Max Digging Depth (2440 mm Level Bottom) | G Max Vertical Wall Digging Depth | Minimum Front Swing Radius | Stick Digging Forces (SAE) | Bucket Forces (SAE) | |
| 1655 | 4140 | 6250 | 7390 | 5250 | 2400 | 3800 | 3600 | 1660 | 36 kN | 45 kN |
| 2210 | 4690 | 6770 | 7810 | 5670 | 2060 | 4380 | 4120 | 2180 | 31 kN | 45 kN |
Lift Capacities with 3700 mm One-piece boom (with blade up)
All weights are in kg.
Medium Stick – 1665 mm, Bucket - 0.3 m³, Shoes - 450 mm
| Load Point Height | 1.5 m | 3.0 m | 4.5 m | 6.0 m | 7.5 m | 6.0 m | 4.5 m | 3.0 m | 1.5 m | Ground | -1.5 m | -3.0 m | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.5 m | *750 | *750 | *600 | *600 | *600 | *750 | *750 | *600 | *600 | ||||||
| 3.0 m | *2050 | *2050 | *600 | *600 | *600 | *2050 | *2050 | *600 | *600 | ||||||
| 4.5 m | *2600 | *2600 | 1650 | 1350 | *600 | *2600 | *2600 | 1700 | 1400 | *650 | *650 | *650 | |||
| 6.0 m | 3150 | 2500 | 1650 | 1300 | *650 | 3150 | 2500 | 1650 | 1300 | *750 | *750 | *750 | |||
| 7.5 m | 3000 | 2300 | 1550 | 1250 | *750 | 3000 | 2300 | 1550 | 1250 | *1000 | *1000 | *1000 | |||
| Ground | *3900 | *3900 | 3100 | 2400 | 1600 | 1300 | *3900 | *3900 | 3000 | 2300 | 1550 | 1200 | *1600 | *1600 | *1300 |
| -1.5 m | *3900 | *3900 | 3100 | 2400 | 1600 | 1300 | *3900 | *3900 | 3000 | 2300 | 1550 | 1200 | *1600 | *1600 | *1300 |
| -3.0 m | 3100 | 2400 | 1600 | 1300 | *1300 | 3100 | 2400 | 1600 | 1300 | *1300 | *1300 | *1300 |
Medium Stick – 1665 mm, Bucket - 0.3 m³, Shoes - 600 mm
| Load Point Height | 1.5 m | 3.0 m | 4.5 m | 6.0 m | 7.5 m | 6.0 m | 4.5 m | 3.0 m | 1.5 m | Ground | -1.5 m | -3.0 m | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.5 m | *750 | *750 | *600 | *600 | *600 | *750 | *750 | *600 | *600 | ||||||
| 3.0 m | *2050 | *2050 | *600 | *600 | *600 | *2050 | *2050 | *600 | *600 | ||||||
| 4.5 m | *2600 | *2600 | 1700 | 1400 | *600 | *2600 | *2600 | 1700 | 1400 | *650 | *650 | *650 | |||
| 6.0 m | 3150 | 2500 | 1650 | 1300 | *650 | 3150 | 2500 | 1650 | 1300 | *750 | *750 | *750 | |||
| 7.5 m | 3000 | 2300 | 1550 | 1250 | *750 | 3000 | 2300 | 1550 | 1250 | *1000 | *1000 | *1000 | |||
| Ground | *3900 | *3900 | 3000 | 2300 | 1550 | 1250 | *3900 | *3900 | 3000 | 2300 | 1550 | 1250 | *1600 | *1600 | *1300 |
| -1.5 m | *3900 | *3900 | 3000 | 2300 | 1550 | 1250 | *3900 | *3900 | 3000 | 2300 | 1550 | 1250 | *1600 | *1600 | *1300 |
| -3.0 m | 3000 | 2300 | 1550 | 1250 | *1300 | 3000 | 2300 | 1550 | 1250 | *1300 | *1300 | *1300 |
Long Stick - 2210 mm, Bucket - 0.23 m³, Shoes - 450 mm
| Load Point Height | 1.5 m | 3.0 m | 4.5 m | 6.0 m | 7.5 m | 6.0 m | 4.5 m | 3.0 m | 1.5 m | Ground | -1.5 m | -3.0 m | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.5 m | *800 | *800 | *700 | *700 | *700 | *800 | *800 | *700 | *700 | ||||||
| 3.0 m | *1650 | 1400 | *700 | *700 | *700 | *1650 | 1400 | *700 | *700 | *650 | *650 | *650 | |||
| 4.5 m | *2200 | *2200 | 1700 | 1350 | *650 | *2200 | *2200 | 1700 | 1350 | *700 | *700 | *700 | |||
| 6.0 m | 3100 | 2500 | 1600 | 1300 | *700 | 3100 | 2500 | 1600 | 1300 | *700 | *700 | *700 | |||
| 7.5 m | 2900 | 2250 | 1500 | 1200 | *700 | 2900 | 2250 | 1500 | 1200 | *800 | *800 | *800 | |||
| Ground | *3150 | *3150 | 2850 | 2200 | 1500 | 1150 | *3150 | *3150 | 2850 | 2200 | 1500 | 1250 | *1000 | *1000 | *1000 |
| -1.5 m | *3150 | *3150 | 3350 | 2550 | 2100 | 1350 | *3150 | *3150 | 3350 | 2550 | 2100 | 1350 | *850 | *850 | *850 |
| -3.0 m | 3800 | 3800 | 2300 | 2300 | *2300 | 3800 | 3800 | 2300 | 2300 | *2300 | *2300 | *2300 |
Long Stick - 2210 mm, Bucket - 0.23 m³, Shoes - 600 mm
| Load Point Height | 1.5 m | 3.0 m | 4.5 m | 6.0 m | 7.5 m | 6.0 m | 4.5 m | 3.0 m | 1.5 m | Ground | -1.5 m | -3.0 m | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.5 m | *800 | *800 | *700 | *700 | *700 | *800 | *800 | *700 | *700 | ||||||
| 3.0 m | *1650 | 1650 | *700 | *700 | *700 | *1650 | 1650 | *700 | *700 | *650 | *650 | *650 | |||
| 4.5 m | *2200 | *2200 | 1750 | 1400 | *650 | *2200 | *2200 | 1750 | 1400 | *700 | *700 | *700 | |||
| 6.0 m | 3100 | 2550 | 1650 | 1300 | *700 | 3100 | 2550 | 1650 | 1300 | *700 | *700 | *700 | |||
| 7.5 m | 3000 | 2300 | 1550 | 1250 | *700 | 3000 | 2300 | 1550 | 1250 | *800 | *800 | *800 | |||
| Ground | *3550 | 2650 | 2300 | 1500 | *800 | *3550 | 2650 | 2300 | 1500 | *1000 | *1000 | *1000 | |||
| -1.5 m | *3150 | *3150 | 3350 | 2550 | 2100 | 1350 | *3150 | *3150 | 3350 | 2550 | 2100 | 1350 | *850 | *850 | *850 |
| -3.0 m | *3800 | *3800 | 2300 | 2300 | *2300 | *3800 | *3800 | 2300 | 2300 | *2300 | *2300 | *2300 |
* Limited by hydraulic rather than tipping load.
The above loads are in compliance with hydraulic excavator lift capacity ratings standard ISO 10567, they do not exceed 87% of hydraulic lifting capacity or 75% of tipping capacity. Weight of all lifting accessories must be deducted from the above lifting capacities.
Standard Equipment
Optional equipment may vary. Consult your Caterpillar dealer for specifics.
| Equipment | Description | Powertrain |
|---|---|---|
| Alternator | 35 amp | MMC 4M40 Diesel engine |
| Automatic swing parking brake | Lighting, interior | 24-volt electric starting |
| Auxiliary hydraulic valve | Literature compartment | One touch low idle |
| Batteries, heavy-duty | Radio ready with 12V converter | Water separator |
| Boom (3700 mm) with left side light | Neutral lever (lockout) for all controls | Two speed auto-shift travel |
| Cab | Openable front windshield | Straight line travel |
| Heater with defroster | Openable skylight | Muffler |
| Ash tray | Pillar mounted windshield wiper and washer | Reverse swing damping valve |
| Beverage holder | Rear window emergency exit | Undercarriage |
| Coat hook | Seat belt | Hydraulic track adjusters |
| Floor mat | Travel control pedals with hand levers | Track-type undercarriage with grease lubricated seals |
| Horn | Utility space for magazines | Idler end track guiding guards |
| Instrument panel and gauges | Door and caps lock with one-key security system | 450 mm triple grouser shoes with additional holes for mounting rubber street pads |
| Joysticks, pilot-operated | Mirrors (cab rear and left) | Working light, chassis mounted |
| KAB T1P seat with adjustable armrest, without head rest |
Optional Equipment
Optional equipment may vary. Consult your Caterpillar dealer for specifics.
| Equipment | Description | Tracks |
|---|---|---|
| Air conditioning | Hydraulic arrangements, auxiliary single-function capability | 600 mm triple grouser |
| Auxiliary hydraulic lines for sticks and boom | combined single and double function capability | 450 mm segment rubber track |
| Blade, 2320 mm, for use with 450 mm steel or segment rubber track | Power supply 12V-5A with cigar lighter type socket | Travel alarm (mandatory in certain countries) |
| Blade, 2420 mm, for use with 600 mm track | Right-side boom lights | |
| Bucket linkage | Stick lowering control device | |
| Boom lowering control device | Sticks | |
| Cab mounted working lights | 2210 mm | |
| Front windshield guard | 1670 mm |
