by Kyle Molyneux | Fri 18 Jun 2021
New Cat 302.7 CR, 303 CR and 303.5 CR mini-excavators
Cat says its new 302.7 CR, 303 CR and 303.5 CR hydraulic mini-excavators introduce industry-first features for the 2.7- to 3.5-ton class machines. Built on the Next Generation platform, each new model features stick steer, cruise control, operator adjustable settings, and tilt-up canopy or cab as standard equipment.
Expanded use of common parts throughout the line plus the sturdy exterior design help reduce parts inventory investment and lower repair costs. Daily maintenance checks can be made from ground level through side doors, while the tilt-up cab design offers unmatched access to components for servicing. Increased service intervals mean these excavators spend more time on the job and less time in the workshop. Combined, these features lower total ownership costs up to 5% compared to previous models.
At the same time, design enhancements for the new 302.7 CR, 303 CR and 303.5 CR deliver up to 10% more performance in travel and trenching. Hydraulic system upgrades improve lifting performance and cycle times, while customizable operator settings improve efficiency.
The turbocharged Cat C1.1 Turbo engine powers the 302.7 CR and 303 CR models, while the Cat C1.7 anchors the powertrain for the 303.5 CR. Both engines meet EU Stage 5 emissions standards and offer 17.6 kW net power. Standard auto idle and auto engine shutdown help to conserve fuel usage at the site for more affordable operation.
These Next Generation hydraulic mini excavators feature a compact radius swing that reduces overhang when working to the side, allowing the machines to optimise performance in confined spaces. Cat says the fixed undercarriage widths for the 302.7 CR, 303 CR and 303.5 CR of 1500, 1550 and 1780mm respectively, deliver the right balance of job site accessibility and stability for lifting performance. An expandable undercarriage option for the 302.7 CR allows the operator to hydraulically retract track width to 1355mm for fitting into confined spaces and then expand width to 1780mm for superior digging and lifting stability.
Interchangeable counterweight packages enable customers to tailor machine weight to job requirements. The ‘light’ counterweight option adds 100kg to machine weight, while the ‘extra’ adds 250kg.
All three Next Gen models offer both standard- and long-stick configurations to increase machine versatility. Standard digging depths range from 2450 to 2810mm, while the long stick configuration allows the machines to reach from 2650 to 3110mm depths. The standard dozer blade further increases machine flexibility to handle backfilling and grading tasks. It features ample above- and below-grade travel and has a standard float function for easy clean-up. An angle blade option on the 303.5 CR gives further flexibility in backfilling applications for increased productivity.
Efficient load-sensing hydraulics with variable displacement pump provides oil flow reaching 100 L/min while saving fuel. High main-relief pressures, coupled with flow rates, generates the hydraulic capacity for high digging and lifting forces and more efficient use of a range of attachments. Complete with quick-disconnect lines, the standard auxiliary system provides the choice of one-way, two-way or continuous flow.
The new 302.7 CR, 303 CR and 303.5 CR offer enhanced machine security options too, with both a passcode and Bluetooth key. With advanced touchscreen available, Cat says the large Next Generation display provides intuitive machine function control and easy monitoring of critical operating parameters, such as fuel level, coolant temperature and maintenance records.
An industry-exclusive Cat Stick Steer System simplifies machine control, and, at the touch of a button, the operator switches from conventional lever/foot-pedal steering controls to low-effort joystick operation. Two travel ranges with speeds reaching 4.5km/h help to facilitate moving around the jobsite, and standard cruise control is said to minimise operator interaction when traveling longer distances between work locations.
The new Next Generation excavators offer the choice between canopy or cab enclosure. The sealed and pressurised cab offers a clean and quiet environment for the operator and can be equipped with heating and/or air conditioning for all-weather climate control. Offering a front window that slides upward to conveniently store overhead, the cab’s large glass areas plus skylight afford all-around visibility.
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