Caterpillar introduce D-series mini hydraulic excavators

The 308D CR, a compact radius machine that works productively in tight spaces, replaces the 308C CR. The 308D CR SB combines the compact radius design with a swing boom. The D-series mini excavators retain the important features of the C-series models with improved features. The new mini excavators outperform their predecessors with 22% higher bucket forces and 10% higher stick forces.

Lift capacity is increased with the addition of a larger counterweight. A 15% increase in traction forces improves dozing and turning performance. Each machine is powered by a new turbocharged Mitsubishi 4M40 TL engine, rated at 54 net horsepower (40 kilowatts).

The engine is reliable, durable, fuel efficient and meets Interim Tier 4 emissions regulations. These improvements, plus a new rubber undercarriage option, standard high-pressure auxiliary hydraulics and standard thumb-ready sticks, make the D-series models suitable for a variety of general construction jobs.

The D-series mini excavators share a common operator’s station with larger Cat excavators. The cab is quiet, roomy and well-ventilated with plenty of legroom. It offers all-around visibility and a clear view to the work area.

A comfortable air suspension seat is available and easy-to-use joystick controls are integrated with the seat and armrests to reduce fatigue. To improve communication between the operator and the machine, a new colour monitor displays information in text. It can deliver messages in 27 languages to accommodate a diverse workforce.

The 307D, 308D CR and 308D CR SB are designed to do more jobs in more places. All models accommodate a complete range of work tools. A standard combined function high-pressure auxiliary hydraulic circuit and standard thumb-ready sticks ensure the excavators are ready for any job.

A standard Cat Tool control system allows the operator to pre-set flows and pressures for up to 10 work tools using the in-cab monitor. The tools can then be used at the touch of a button, without resetting the hydraulic system.

While a large work tool selection makes these machines excel at many jobs, their size also contributes to their versatility. The two compact radius models work where full sized units cannot go, and the addition of a swing boom to the 308D CR SB enables it to work more productively alongside buildings, fences and other obstructions.

Many features make the D-series models economical to own and operate. An economy mode reduces fuel consumption in light-duty applications, while maintaining high bucket forces and lift capacity. A boom and stick regeneration circuit saves energy during boom-down and stick-in operations. Grease lubricated track offers long wear life and the easy-access service points and extended maintenance intervals increase uptime and drive down operating costs.

The following are the basic specifications for D-series mini hydraulic excavators:

307D hydraulic excavator:

• Engine - MMC 4M40 TL
• Net power - 55.6hp (41.5kW)
• Operating weight - 15,598lb (7075kg)
• Maximum reach at ground - 21ft 11 inch (6670mm)
• Maximum dig depth - 15ft 1 inch (4600mm)
• Tail swing overhang - 2ft 0 inch (605mm)
• Bucket force - 11,061lb-ft (49.2kN)
• Stick force - 8,138lb-ft (36.2kN)
• Max traction force - 12,747lb-ft (56.7kN)

308D CR hydraulic excavator:

• Engine - MMC 4M40 TL
• Net power - 55.6hp (41.5kW)
• Operating weight - 17,306lb (7 850kg)
• Maximum reach at ground - 22ft 0 inch (6710mm)
• Maximum dig depth - 15ft 2 inch (4630mm)
• Tail swing overhang – 5 inch (130mm)
• Bucket force - 13,489lb-ft (60kN)
• Stick force - 8,768lb-ft (39kN)
• Max traction force - 14,523lb (64.6kN)

308D CR SB hydraulic excavator:

• Engine - MMC 4M40 TL
• Net power - 55.6hp (41.5kW)
• Operating weight - 18,519 (8400kg)
• Maximum reach at ground - 24ft 5 inch (7430mm)
• Maximum dig depth - 15ft 6 inch (4730 mm)
• Tail swing overhang - 6inch (150mm)
• Bucket force - 13,489lb-ft (60kN)
• Stick force - 8,768lb-ft (39kN)
• Max traction force - 14,388lb-ft (64kN)