Used Caterpillar 303.5 Excavator

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Here is a detailed introduction to the Caterpillar 303.5 mini excavator in English, covering its key features, specifications, performance, and applications.

Caterpillar 303.5 Mini Excavator: An In-Depth Overview

The Cat® 303.5 Mini Excavator is a versatile and powerful compact machine designed for a wide range of applications, from general construction and landscaping to utility work and demolition. As part of Caterpillar’s next-generation mini hydraulic excavator lineup, the 303.5 combines robust digging performance, exceptional maneuverability, and advanced technology in a compact footprint. It is engineered to deliver high productivity, low operating costs, and superior operator comfort, making it an ideal choice for contractors who demand reliability and efficiency on the job site.

Engine and Performance

At the heart of the Cat 303.5 is the Cat C1.7 Turbo diesel engine. This 1.7-liter, 4-cylinder powerplant meets stringent emission standards (such as EU Stage V and U.S. EPA Tier 4 Final) without the need for a diesel particulate filter (DPF), relying instead on an advanced combustion strategy and after-treatment system. The engine delivers:

Gross Power: 24.2 hp (18.1 kW)
Net Power: 23.5 hp (17.6 kW)This ample power output ensures responsive performance, smooth operation, and strong digging forces, even under demanding conditions. The automatic engine idle feature reduces engine speed when the hydraulic controls are not engaged, which lowers fuel consumption, reduces noise, and extends component life.

Hydraulic System

The 303.5 features a load-sensing hydraulic system with a variable-displacement piston pump. This intelligent system provides hydraulic flow precisely when and where it is needed, optimizing efficiency and delivering smooth, predictable control. Key hydraulic specifications include:

Maximum Auxiliary Hydraulic Flow: Up to 105 L/min (27.7 gpm), enabling high-performance attachment operation.
System Pressure: High operating pressure provides impressive breakout forces.
Digging Forces:
- Bucket Digging Force: 30.7 kN (6,900 lbf)
- Stick Digging Force: 18.6 kN (4,180 lbf)
  These forces, combined with the responsive hydraulics, allow the machine to tackle tough digging, trenching, and lifting tasks with ease. The standard auxiliary hydraulic lines are plumbed to the mid-stick, and the system is pre-configured for quick attachment changes, supporting both one-way and two-way flow attachments such as augers, breakers, thumbs, and tilt rotators.

Structure, Undercarriage, and Dimensions

The Cat 303.5 is built on a robust steel frame designed for durability and long service life. Its compact radius design (on CR models) or standard tail swing configuration allows operation in confined spaces without sacrificing stability. The undercarriage is available in either a fixed or retractable track gauge:

Retractable Undercarriage: Hydraulically extends from 1,350 mm (4 ft 5 in) to a maximum of 1,550 mm (5 ft 1 in) wide, providing enhanced stability when working over the side and a narrow profile for passing through gates or tight passages.
Track Options: Rubber tracks are standard for minimal ground disturbance on finished surfaces; steel tracks are available for more aggressive applications.

Key dimensional and weight data (with canopy and standard stick):

Operating Weight: Approximately 3,745 kg (8,257 lbs) with cab, depending on configuration.
Transport Length: 4,510 mm (14 ft 10 in)
Transport Width (tracks retracted): 1,350 mm (4 ft 5 in)
Transport Height: 2,420 mm (7 ft 11 in)
Maximum Digging Depth: 3,680 mm (12 ft 1 in)
Maximum Reach at Ground Level: 5,580 mm (18 ft 4 in)
Maximum Dump Height: 3,990 mm (13 ft 1 in)
Tail Swing Radius (standard): Around 1,220 mm (4 ft 0 in), though the dedicated 303.5 CR model offers an even smaller tail swing for ultra-confined areas.

Operator Environment and Comfort

Caterpillar has prioritized operator comfort and ergonomics in the 303.5’s cab and canopy designs. The standard ROPS/TOPS/FOPS certified cab provides a spacious and quiet working environment with excellent all-around visibility thanks to large glass windows and a narrow cab pillar design. Features include:

Suspension Seat: Adjustable mechanical or optional high-back heated air-suspension seat with adjustable armrests.
Climate Control: An efficient heating and air conditioning system with multiple vents ensures year-round comfort.
Ergonomic Controls: Low-effort pilot-operated joystick controls with adjustable wrist rests. Auxiliary functions are easily modulated via proportional slider switches on the joysticks.
Display and Monitoring: A full-color 5-inch LCD monitor provides the operator with real-time information on machine status, fuel consumption, maintenance alerts, and rear-view camera feed (when equipped). The monitor also serves as the interface for Cat GRADE technology and other smart features.
Storage and Convenience: Ample storage compartments, a cup holder, USB charging port, and Bluetooth radio with hands-free microphone are integrated into the workstation.

Smart Technology and Connectivity

The Cat 303.5 is equipped with advanced technology to boost productivity and reduce operating costs:

Cat Product Link™: Standard cellular-based telematics provides remote monitoring of machine location, hours, fuel levels, utilization, and diagnostic codes via the VisionLink® web or mobile application. This helps fleet managers optimize scheduling and maintenance.
Cat GRADE with 2D (optional): An entry-level machine guidance system that displays depth, slope, and horizontal distance to grade on the in-cab monitor. It can also include E-fence functionality, which allows the operator to set virtual boundaries for the work tool, preventing the machine from entering prohibited zones or damaging underground utilities.
Swing Boom (optional on some configurations): A hydraulically pivoting boom that allows the machine to dig parallel to obstacles such as walls or fences, greatly increasing versatility in tight urban job sites.

Serviceability and Maintenance

Caterpillar has designed the 303.5 for easy daily maintenance, maximizing uptime:

Ground-Level Access: All routine check points—engine oil, fuel/water separator, air filter, and cooling system—are accessible from ground level via wide-opening side doors and a tilt-up canopy/cab.
Centralized Grease Points: Boom and swing bearing grease fittings are grouped together for quick lubrication.
Easily Removable Panels: The engine hood and side panels open wide, providing excellent access to major components.
Extended Service Intervals: Long engine oil and filter change intervals, along with a durable hydraulic system, reduce the frequency of maintenance.

Attachments and Versatility

The 303.5’s versatility is further expanded by a comprehensive range of Cat work tools and attachments that can be swapped quickly using the standard Cat Pin Grabber Coupler or manual quick coupler. Compatible attachments include:

Digging, grading, and clean-up buckets in various widths
Hydraulic breakers
Augers
Hydraulic thumbs (progressive link or full rotation)
Plate compactors
Tilting buckets and tilt rotatorsThe machine’s auxiliary hydraulic system and optional high-flow capability ensure that even demanding hydraulic attachments operate at peak efficiency.

Safety Features

Safety is integral to the design:

ROPS/TOPS/FOPS certified cab or canopy.
Rear-view camera standard with the LCD monitor, with an audible travel alarm.
360-degree visibility with strategically placed mirrors.
Operator presence detection (pilot lockout lever) that disengages all hydraulic functions when the armrest is raised.
Anti-slip steps and platforms for secure entry and exit.

Applications

Thanks to its compact size, power, and extensive attachment compatibility, the Cat 303.5 excels in numerous applications:

Residential and commercial construction site preparation
Utility trenching and pipe laying
Landscaping and grading
Road repair and curb work
Demolition of small structures and interior demolition
Snow removal and material handling
Agricultural and cemetery work

In summary, the Caterpillar 303.5 mini excavator delivers a premium combination of performance, comfort, and smart technology. It is engineered to help operators of all skill levels work more accurately, safely, and productively, while its durable construction and easy serviceability ensure a low total cost of ownership over the machine’s lifetime.

Non flooded

No accident

Original product

Used Caterpillar 303.5 Excavator

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