308D CR

The Cat 308D CR Mini Hydraulic Excavator delivers superior performance and comfort while reducing your operating costs. The large spacious cab provides a comfortable work area. Intuitive seat-mounted controls are easy to use for greater job accuracy and efficiency. The compact radius design allows jobsite work where other machines cannot operate--significantly impacting your bottom line. The 308D CR sets the standard for excavators in the eight-ton size class.

Engine Model Mitsubishi 4M40 TL
Net Power 55.6 hp
Gross Power 57.6 hp

Operating weight 17306.0 lb
Operating Weight with Cab 17306.0 lb
Operating weight with cab (308D CR SB) 18519.0 lb

Max digging depth - standard stick 13.4 ft
Max reach ground level - standard stick 20.3 ft
Length to Center of Rollers 20.1 ft
Max dump height - long stick 18.8 ft
Max dump height - standard stick 17.4 ft
Max vertical dig depth - standard stick 12.0 ft
Shipping Height 8.5 ft
Shipping length 19.1 ft
Swing radius - rear 4.2 ft

Engine Dimensions
Bore 3.7 in
Stroke 3.9 in
Displacement 173.0 in3

Travel System
Gradeability (max) - high 35.0 Degrees
Max traction force 14523.0 lb
Travel speed - high 3.1 mph
Travel speed - low 1.9 mph

Hydraulic System
Operating Pressure - Equipment 4061.0 psi
Digging forces - stick (standard) 8768.0 lb
Digging force - stick (long) 7868.0 lb
Digging force - bucket 13489.0 lb
Operating Pressure - Travel 4641.0 psi
Operating Pressure - Swing 3481.0 psi
Auxiliary circuit - primary 33.8 gal/min
Auxiliary circuit - secondary 16.9 gal/min

Swing System
Machine swing speed 10.0 RPM

Sound Levels
Exterior Cab 98.0 dB(A)
Interior Cab 79.0 dB(A)

Service Refill Capacities
Cooling system 4.1 gal
Engine oil 3.3 gal
Hydraulic tank 21.9 gal
Fuel tank 33.0 gal
Hydraulic system 24.8 gal

MSC Comments
MSC Spec Date 1/06

Operator Station
Simple, easy operation allows the operator to focus on production.

Operator Station

A larger, spacious cab provides operator comfort and improved visibility. Joystick controlled swing boom and auxiliary switches clear space on the floor giving the operator plenty of foot and leg room. An intuitive cab layout for ease of operation reduces operator fatigue. Other cab features include:
  • Air conditioning is standard.
  • 12V power receptacle for charging cell phones.
  • A reclining air suspension seat with adjustable armrests.
  • Storage space for literature and cup holder.
  • Low effort joystick controls designed to match the operator’s natural wrist and arm positions. Consoles can be adjusted independently of the seat for maximum comfort.
  • Overhead skylight improves visibility and can be opened to create air flow.
  • Upper front windshield opens and easily stores on the roof above the operator with an automatic latching mechanism.
  • All functions are fully pilot operated lowering owning and operating costs.
  • Pattern control changer is located under the floor mat.

Monitor Display
Newly designed LCD monitor is located to give a clear view of the machine’s monitoring system, ensuring fuel level, water temperature and warning lights are easily seen.

Compact Radius
More versatile in tight areas.

Compact Radius

Compact Radius Design
  • The compact radius design provides greater versatility and capability to work within confined areas. The radius of the upper body stays close to the width of the undercarriage allowing the operator to concentrate on the work at hand, rather than the tail swing of the machine.
  • Cab door is curved and shaped to follow the line of the cab, it slides open taking up less space than a hinged door. When working in tight areas this allows for safer ingress and egress. This design maintains the machine’s compact dimensions reducing the risk of damage.
  • Jobsite flexibility with a reduced risk of damage and less stress for the operator add up to higher rates of productivity.

Powerful digging with precise control.


Smooth responsive hydraulics give the level of control demanded by the customer in any application, from fine grading and dozing to backfilling. Powerful bucket and stick digging forces combined with fast cycle times result in world class productivity and performance. Automatic two speed function improves jobsite maneuverability with precise control by balancing travel speed with the torque needed for turning and travelling on inclines. Dozer blade float function enables easy ground levelling for landscaping and finish grade applications as well as more efficient jobsite clean-up. Economy mode can be selected with the in-cab LCD monitor and provides better fuel efficiency in a platform well suited for less experienced operators.

Joystick mounted auxiliary and boom swing control enhances machine controllability. Intuitive controls give fine modulation. The levers and dozer function ensure “as new” levels of controllability are maintained throughout the machine life.

Lift Capacity
The new Caterpillar D-Series has industry leading lift capacity matched with outstanding stability in a compact radius package. This provides the on-site versatility required to match the diverse and continually changing needs of the customer.

Stick and Boom
A choice of standard or long, thumb ready sticks enable the customer to match the machine’s digging envelope to their requirements. The boom options feature a fixed boom to maximize stability and lifting and a swing boom design that maximizes reach. The swing boom also allows the operator to trench parallel to tracks, dig close to structures and dig a box-section without repositioning the undercarriage.

Clean, quiet and efficient.


  • Interim Tier 4 turbocharged engine gives higher power and maintains strong performance at high altitude.
  • High digging forces give power through even the most compacted ground with smooth control and responsive hydraulics that deliver productivity that our customers demand.
  • Load sensing hydraulics optimize the flow of oil for smooth powerful performance and increased fuel economy.
  • Automatic engine idle lowers engine revolutions when not in use to conserve fuel and lower environmental noise/emissions.

Work Tools
Cat work tools are matched to meet your application needs.

Work Tools

Work Tools
A wide range of work tools have been developed and integrated into the machine design to maximize machine performance and deliver excellent value through high productivity and long life. Cat Work Tools include:
  • Heavy Duty Buckets
  • Heavy Duty Rock Buckets
  • Ditch Cleaning Buckets
  • Hydraulic Hammers
  • Augers
  • Shears
  • Compactors
  • Thumbs
  • Quick Couplers

To maximize performance, Caterpillar Pin-Grabber Quick Couplers are compatible with all standard work tools, enabling the operator to simply release one work tool and pick up another, maximizing productivity. The couplers are available in hydraulic and manual versions.

Auxiliary Hydraulics
The combined function high-pressure auxiliary lines and quick connectors are fitted as standard. This auxiliary system includes a diverter valve which provides optimum performance when using a one-way flow (hammer) or two-way flow (auger and thumb) work tool. This feature allows the machine to adapt to a wide variety of applications without re-configuring the auxiliary lines. Versatility is further enhanced with optional hydraulic lines enabling the use of a hydraulic quick coupler. A secondary auxiliary supply circuit for work tools utilizing a rotating or other medium-pressure circuit is also available as an optional attachment.The auxiliary flow can be changed through the in-cab LCD monitor from 64 L/min (16.9 gal/min) to 128 L/min (33.8 gal/min). This allows the machine and work tool to provide optimum performance and better match the customer’s application requirements.

Caterpillar offers three varieties of thumbs: Stiff Link, Hydraulic and Progressive Link. The stiff link thumb incorporates the use of a fixed link between the thumb and the stick, requiring bucket curl to secure the load. The hydraulic thumb replaces the stiff link with a cylinder that enables movement by both the thumb link and the bucket to grab an object. A progressive link thumb works much like a hydraulic thumb with more thumb rotation by incorporating an additional link. This additional rotation provides a better working range when securing material. The three varieties come with two lengths, one compatible with a pin-on bucket and one compatible with a pin-grabber coupler.

Excellent stability.


Track Options
The Cat 308D CR and 308D CR SB offer four different track options to choose from allowing the correct machine configuration to suit the job.

Steel Track
The standard track offering is a 450 mm (18 in) triple grouser track. Grease-lubricated track links, split master link and sealed track rollers reduce owning and operating costs. Steel tracks provide optimum stability when lifting over the side. This track is also offered in a 600 mm (24 in) width that provides additional stability and reduced ground pressure.

Rubber Belt
New to the D-Series is a 450 mm (18 in) width rubber belt. This rubber belt is a traditional mini excavator attachment providing minimal work site damage and the ability to work on multiple surfaces. Construction of this rubber track consists of embedded steel shanks which engage the sprocket and steel cables ensuring rigidity and straight travel.

Segmented Rubber Track
The 450 mm (18 in) wide segmented rubber track incorporates the best attributes of both the steel track and the rubber belt. Stability is maximized due to the rigid rubber pads that bolt to the track chain. The thick rubber pads are individually serviceable, minimizing work site damage and provide long wear life.

Rubber Pads
Offered through the dealer parts system, the 450 mm (18 in) wide shoe has four holes that attach rubber pads to the track. This option will prevent damage to paved road surfaces minimizing noise and vibration during travel with a standard steel track system.

Blade Widths
The dozer blade is an important tool used for backfilling trenches, levelling, landscaping, lifting and jobsite clean-up. There are two blade options available. The standard 2320 mm (91 in) blade comes with a replaceable weld-on dozer wear edge and the optional 2470 mm (97 in) blade comes with a replaceable bolt-on dozer wear edge. Both blades are constructed of hardened steel for longer life and extreme dozing ability.

Tie-down Points
Tie-down points are located on the blade and undercarriage for easy and safe machine tie down for transportation.

Easy access and minimal maintenance requirements keep your machine on the job.

Robust, reliable and easily serviceable are the key attributes of Cat® Mini Hydraulic Excavators. Full steel body work panels and protected front linkage lines are routed neatly out of the way of potential damage above the boom. Easy access to all daily service points are accessed through the rear hood and side cover. A 500 hour engine oil change period lowers operating costs and the Cat S•O•SSM points assist easy oil sampling for preventative maintenance checks.

Product Link
The optional Product Link system simplifies equipment fleet tracking. Using satellite or cellular technology, the system automatically reports information such as location, machine hours, active and logged service codes and security alarms.

Machine Security System
An optional Machine Security System (MSS) that utilizes a programmable key system deters theft, vandalism and unauthorized usage. MSS uses electronically coded keys selected by the customer to limit usage by individuals or time parameters.

Customer Support
Unmatched support makes the difference.

Customer Support

Customer Support
Your Cat dealer is ready to assist you with your purchase decision and everything after.
  • Make comparisons of machines, with estimates of component life, preventative maintenance and cost of production.
  • Financing packages are flexible to meet your needs.
  • Your Cat dealer can evaluate the cost to repair, rebuild and replace your machine, so you can make the right choice.
  • A worldwide computer network enables the dealer parts counter to locate nearly all parts.
  • For more information on Cat products, dealer services and industry solutions, visit us at www.cat.com.

Standard Equipment

  • Cab fully glazed
  • Interior light
  • Pillar mounted windshield wiper and washer
  • Air conditioning, heater and defroster
  • Bolt-on FOGS capability
  • Openable uppper front windshield
  • Removable lower front windshield
  • Openable skylight
  • Right and rear windows, polycarbonate
  • Sliding door window, tempered glass
  • Rear window, emergency exit
  • Seat, high back suspension, fabric covered, 4 way adjustment
  • Armrest, adjustable
  • Seatbelt 75 mm (3 in)
  • Coat hook
  • Cup holder
  • Literature compartment
  • Floor mat
  • Mirrors
  • AM/FM radio
  • Monitoring system, guages and indicators
  • Neutral lever hydraulic lockout
  • Joystick pilot operated controls
  • Auxiliary control, joystick (proportional control)
  • Travel control pedals with hand levers
  • Power supply, 12V
  • Dial type accelerator
  • Work light, cab-mounted
  • CAT HD batteries, (cold weather start)
  • Altenator 35 amp
  • Warning horn
  • 24-volt electric starting
  • MMC 4M40-TL Diesel Engine
  • Certified to meet U.S. EPA Interim Tier 4
  • Extended life coolant -37°C (-34°F)
  • Variable displacement load sense hydraulics
  • Combined function auxiliary hydraulic circuit
  • Quick disconnect fittings
  • Automatic swing parking brake
  • Control pattern changer
  • Travel alarm
  • Straight line travel
  • Boom check valve
  • Two speed auto-shift travel
  • Automatic engine idle
  • Boom lowering device (accumulator)
  • Reverse swing damping valve
  • 2500 m (8,200 ft) altitude capability
  • Steel tracks, 450 mm (18 in)
  • Dozer blade with float function
  • Blade, weld on cutting edge
  • Grease lubricated track seals
  • Idler end track guiding guards
  • Hydraulic track adjusters
  • Caterpillar Corporate "One Key" System
  • Fuel cap, lockable
  • Doors, lockable
  • Stick, standard, thumb ready
  • Bucket linkage with lifting eye
  • Additional counterweight
  • Toolbox
  • Antenna
  • Pictograph films

Optional Equipment

  • Headrest for KAB 528P/C, T8P/C
  • Cab fan
  • Sun visor
  • Light, boom-mounted
  • Cooling package, high ambient
  • Starting kit, cold weather
  • Coolant, extended life -50°C (-58°F)
  • Medium pressure auxiliary lines
  • Hydraulic quick coupler lines
  • Rubber tracks, 450 mm (18 in)
  • Segmented rubber track, 450 mm (18 in)
  • Bolt on rubber pads
  • Steel tracks, 600 mm (24 in)
  • Blade, bolt on cutting edge
  • Quick Couplers: Mechanical, Hydraulic, Pin Lock and Wedge Style
  • Buckets: Heavy Duty, Heavy Duty Rock, Ditch Cleaning and Pin Lock
  • Thumbs: Hydraulic, Full Rotation and Stiff Link
  • Auger
  • Hammer
  • Shear
  • Compactor
  • Stick, long
  • Guard - Front screen cab and canopy
  • Guard - Vandalism
  • Guard - Falling objects
  • Guard - Swivel
  • Rain protector, cab front



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