Used Caterpillar 303.5E Excavator

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Caterpillar 303.5E CR Compact Excavator Detailed Introduction

The Caterpillar 303.5E CR (Compact Radius) is a 3.5-ton class mini excavator developed and manufactured by Caterpillar Inc., the global leading construction equipment manufacturer. As part of Cat’s E-series compact excavator lineup, it is engineered for high maneuverability, versatility, and low total operating cost, making it a top choice for small construction contractors, rental fleets, landscaping service providers and municipal engineering teams.

1. Core Specifications

Parameter	Standard Configuration Value
Operating Weight	3,500 – 3,800 kg (7,716 – 8,378 lb, varies by cab and attachment configuration)
Rated Power	18.4 kW (24.7 hp) at 2,400 rpm
Emission Standard	EPA Tier 4 Interim / EU Stage IIIA (upgraded 303.5E2 variant meets EPA Tier 4 Final / EU Stage V)
Max Digging Depth (standard arm)	3,110 mm (10 ft 2 in)
Max Reach at Ground Level	5,020 mm (16 ft 6 in)
Bucket Breakout Force	29.3 kN (6,587 lbf)
Tail Swing Radius	1,160 mm (3 ft 10 in, ultra-short tail design for narrow space operation)
Standard Bucket Capacity	0.11 – 0.22 m³ (0.14 – 0.29 yd³)
Travel Speed	2.2 / 4.3 km/h (1.4 / 2.7 mph)

2. Power System

The 303.5E is equipped with a Caterpillar independently developed C1.1T 3-cylinder turbocharged diesel engine, tuned for high reliability and fuel efficiency in harsh working conditions:

Adopts electronic fuel injection technology and optimized combustion chamber design, reducing fuel consumption by up to 10% compared with the previous generation D-series 3-ton excavator.
Excellent extreme environment adaptability: supports normal cold start at -20°C (-4°F without auxiliary devices), and the high-temperature cooling system ensures stable operation under 45°C (113°F) ambient temperature.
Equipped with automatic idle and ECO mode: automatically reduces engine speed after 3 seconds of no operation, cutting idle fuel loss and noise emission significantly.

3. Hydraulic System

It carries Cat’s proprietary load-sensing hydraulic system, delivering smooth and precise operation experience:

280 bar (4,060 psi) system pressure provides strong digging force for hard soil, gravel and light rock working conditions.
Precise flow distribution ensures coordinated compound actions (simultaneous boom lifting, arm retraction and swing) without lag or jitter, greatly improving operation accuracy for fine work such as pipeline laying and landscaping.
Optional auxiliary hydraulic line delivers 40 L/min (10.6 gpm) flow, with adjustable flow rate via the cab control panel to match different hydraulic attachments. The hydraulic oil filter has a 2000-hour service life, reducing maintenance costs.

4. Operator Comfort & Safety

The 303.5E offers two cab options to adapt to different use scenarios: open ROPS/FOPS certified canopy for warm regions and low-height operation, and fully enclosed pressurized cab for all-weather work:

Ergonomic design: fully adjustable seat with lumbar support, low-positioned proportional control joysticks reduce arm fatigue during long-hour operation.
The enclosed cab has a high-efficiency HVAC system with heating and cooling functions, and the in-cab operating noise is only 78 dB(A), far lower than similar products in the same class.
Large glass area and skylight provide 360° panoramic visibility, allowing operators to clearly observe the bucket tip and surrounding working area.
Standard hydraulic lock function: all hydraulic actions are locked when the safety lever is lifted, preventing injury caused by misoperation. Optional rear view camera eliminates rear blind spots.

5. Structural Durability

All key structural components are designed and tested following Cat’s heavy-duty equipment standards, with a service life of over 10,000 hours under normal use:

Boom and arm are made of high-strength tensile steel, with reinforced plates added at welding joints and stress concentration points to withstand frequent impact loads during heavy digging work.
X-shaped integral welded chassis has excellent torsion resistance. Standard rubber tracks cause no damage to urban roads, and optional steel tracks are available for harsh working scenarios such as quarries.
Sealed lubricated track rollers have a 5000-hour service life under normal operation, reducing daily maintenance frequency.

6. Versatility & Maintenance Convenience

Versatility

The 3035E supports a wide range of original Cat or compatible attachments: general digging buckets, ditch cleaning buckets, rock buckets, hydraulic breakers, augers, plate compactors, grapples and hydraulic shears. The optional quick coupler allows operators to replace attachments within 10 seconds without getting off the machine, greatly improving work efficiency.

Maintenance

All daily maintenance points (oil dipstick, fuel filter, air filter, hydraulic oil check port) are arranged on the side of the fully openable engine compartment, accessible when standing on the ground without climbing the machine. Optional Cat Product Link telematics system supports real-time remote monitoring of working hours, fuel consumption, fault codes and maintenance reminders, which is convenient for fleet management and reduces unplanned downtime.

7. Application Scenarios

With its ultra-short tail swing design, the 303.5E can operate freely in narrow spaces that medium and large excavators cannot access, including urban alleys, indoor demolition sites, residential yards, and beside municipal roads. It is widely used in earthmoving, landscaping, pipeline laying, small demolition, road repair and snow removal scenarios, and is one of the best-selling models in the global 3-4 ton compact excavator market.

Non flooded

No accident

Original product

Used Caterpillar 303.5E Excavator

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