CAT used the recent National Construction Exhibition to launch its next generation mini excavators designed for optimum customer value.
CAT recently launched five new models in the CAT mini hydraulic excavator lineup, engineered and manufactured by Caterpillar and designed to provide users with the best performance, versatility, safety, operator convenience and affordability in the smallest possible packages for one to two-tonne class machines. This customer-centered approach to engineering results in the new models incorporating industry-first standard features for Micro Excavators, such as joystick steering (Stick Steer), a tilt-up canopy and cab, automatic two-speed travel, as well as new options, including air-conditioning, expandable undercarriages across the range and Bluetooth enabled push-to-start.
The new model range allows customers greater choices for matching machine capabilities and features to applications:
- 301.5 (1.5-tonne class, standard tail swing, with canopy);
- 301.6 (1.6-tonne class, standard tail swing, with cab);
- 301.7 CR (1.7-tonne class, compact radius, with canopy);
- 301.8 (1.8-tonne class, standard tail swing, with either canopy or cab); and
- 302 CR (2.0-tonne class, compact radius, with either canopy or cab).
Minimum operating weights (approximate) for the new models range from 1,575 to 2,045kg with weights increasing to 1,760 to 2,200kg, depending on machine configuration. Standard dig depths are 2,340mm to 2,370mm, depending on the model, and an available long stick increases depth 2,540 or 2,570 mm. Rubber track undercarriages are standard, with steel tracks available for all models.
All the new models use the CAT C1.1 engine, a three-cylinder diesel rated at 19.2 net horsepower (14.3kW), and 21.6 gross horsepower (16.1kW) meeting Tier 4 Final/Stage V emissions regulations. The C1.1 features a power-dense design and delivers consistent performance through a wide speed range. The CAT C1.1 provides a significant increase in engine power and performance over previous models. Fuel efficiency is enhanced with engine idle control and automatic shutdown systems.
Premium features
The new Next Generation mini excavators use an efficient, fuel saving, load-sensing hydraulic system with an electronically controlled variable displacement piston pump capable of oil flows to 66 L/min. Flow rates, coupled with high main-relief pressures, provides new models with the hydraulic capacity to generate high digging and lifting forces, as well as manage powered attachments.
For added versatility, the standard auxiliary hydraulic system (complete with quick disconnect lines) provides one way, two way and continuous flow. All new models can be fitted with a CAT manufactured manual coupler together with a wide selection of CAT manufactured buckets including General duty digging, mud and tilting ditch cleaning. Other readily-available CAT attachments include augers, hammers and compaction wheels.
In addition, all models are equipped with factory-installed brackets to allow for easy thumb installation and come with a certified lifting eye. The CAT coupler design also allows operators to reverse attachments for front shovel operation, a capability that lends an extra measure of precision when digging around utilities.
The expandable undercarriage (standard for all models) narrows to allow the new machines to enter work sites through restricted access points, then extends to provide a stable work platform. Undercarriages for 301.5, 301.6, 301.7 CR and 301.8, expand from 990mm to 1,300mm. The 302 CR expands from 1,090mm to 1400mm.
Each model features a dozer blade that further expands the machines capability of the new models which, when combined with stick-steer function allows the machine to handle backfilling and grading tasks with ease. The blade features ample travel, above and below ground level, has a float function and is designed to allow ‘dig-to-blade’ operation for more efficient handling of loose materials.
Operator environment
The design of the new Next Generation mini excavators emphasises comfort, convenience, and operator safety. The cab; standard on the 301.6, and optional on both the 301.8 and 302 CR, is pressurised and sealed to minimise dust intrusion and operator sound levels. It also creates an efficient in-cab cooling environment. The front window slides upward and stores overhead, and large glass areas on the sides and rear of the cab, plus a skylight, provides all around visibility. The operating consoles feature adjustable wrist rests, and an optional suspension seat. A retractable, 3-inch-wide seat belt is both comfortable to wear and comes in high-visibility orange.
Controls are designed to be intuitive, with a pattern changer that allows operators to select their preferred system between Excavator and Backhoe pattern. A machine security system is standard on all models: a key combined with operator pass code or an optional push-to-start button with Bluetooth enabled fob for automatic key recognition.
The Next Generation models come with LCD monitor provides easy-to-read machine information and features a jog dial for easy navigation and interaction with the monitor.
Stick steer – a new way to move
An exclusive feature for the new Next Generation models is the standard Stick Steer system built into all models. This allows the operator to control tracks using the left-hand joystick control at the touch of a button. Stick Steer provides the benefit of less effort combined with improved operator control. Complementing stick-steer functionality is an automatic two-speed travel that significantly speeds up machine positioning and control.
Safety and service
Protective structures (ROPS, TOPS, and Top Guard—Level II) are designed to promote a safe working environment for operators. All controls are protected via a hydraulic lock out, and boom lights help illuminate the work area. Optional LED lights, front and rear, help to further enhance visibility. The easy-to-transport Next Generation models also feature tie-down points on the track frames to facilitate securing the machine.
Routine maintenance check points are accessible at ground level through the side doors, and the battery is maintenance-free. The tilt-up cab allows access to major hydraulic components by simply removing two retaining bolts and lifting the cab. This is made easier with the inclusion of a gas strut allowing a single person to complete this operation in under five minutes.