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Overview – CAT 305.5E Mini Excavator

Engineered to combine durable construction and reliable performance with low operating costs, the new Cat® 305.5E mini hydraulic excavator is a conventional tail swing, fixed side boom model with an operating weight of 5,300 kg (11,700 lb.). The new model further expands the E Series mini hydraulic excavator lineup that was launched earlier this year in June in China.  Along with the 306E and 307E, this model will be manufactured at the Caterpillar facility in Wujiang, P.R. China.

The new model uses a fuel efficient Cat C2.4 DI engine with a net power rating of 32 kW (43 hp) and features a powerful load-sensing hydraulic system with standard auxiliary hydraulic valve section. Operator comfort is ensured with a spacious, air-conditioned cab that features pilot operated joystick controllers and a high-back seat.  The C2.4 engine features a new direct injection fuel system that delivers optimum fuel efficiency.  A high ambient temperature cooling system is standard featuring stacked coolers for a compact design. A 12-volt electrical system ensures reliable performance and requires only one battery. An available optional water-jacket heater package improves the engine’s cold start capability to temperatures below -15.7 C (4 F).

The 305.5E uses the exclusive Cat load sensing, flow sharing hydraulic system which is designed to balance oil flow requirements for simultaneous hydraulic functions with engine speed and power. The system is designed to provide precise, rapid hydraulic response for reduced cycle times in all operating situations. The two speed hydrostatic drive system has the power to negotiate steep grades and can counter-rotate in either speed range.

Front linkage for the 305.5E uses heavy duty box section fabrications for the curved boom and stick, and the bearing sleeves at linkage pivot points are oil impregnated to extend lubrication intervals to 500 hours in normal use. Both the boom and stick cylinders provide dampened movement at the end of their stroke to reduce shock loads and to optimize material retention. An auxiliary hydraulic valve section is standard equipment, and optional plumbing brings hydraulic connections to the boom foot and stick, allowing use of powered work tools.

The 305.5E incorporates heavy duty upper and lower frame structures, as well as a heavy duty undercarriage that provides a large base for stability when digging and lifting. In addition, it has a standard blade with a float function, further enhancing stability and increasing the machine’s versatility by providing added back-filling and grading capabilities.

The standard enclosed cab, with air conditioning, has a tilt-up, hydraulic lockout lever, ensuring that the operator cannot leave the seat without disabling implement and drive-system hydraulics, providing added safety. Low effort pilot operated joystick levers allow precise control of implement hydraulic functions.

Operator comfort is enhanced with adjustable wrist rests adjacent to the joysticks and with the high back suspension seat. A radio with auxiliary inputs is standard, and cab ventilation is enhanced with a new fresh air filter on the left side of the cab. A new floor mat and footrest add to the overall utility of the cab.

Serviceability features include one side engine maintenance and large access doors that facilitate routine maintenance. Hydraulic filter maintenance is extended to 2,000 hours. New tool box and grease can holder are built into the 305.5E’s right platform, and an added service-access step allows a larger and safer platform for performing machine maintenance.

Comfortable Working Environment

Spacious and comfortable operator station with excellent visibility and legroom keeps the operator comfortable and reduces fatigue. Standard features include:

  • Reclining suspension seat with adjustable wrist rests.
  • Pilot operated controls on all services including travel levers and dozer functions.
  • Two post canopy design for better visibility to the work area.
  • A pattern control changer (not available in all regions) is accessible from the cab to switch between excavator and backhoe style controls.
  • Ample storage space under the seat that can be locked for added security.

Optional Enclosed Cab

For even greater operator comfort, an enclosed cab is available as an option and features:

  • Enclosed cab with heat and optional air conditioning to keep you comfortable in a wide range of conditions.
  • Radio ready with speakers and easy radio installation.
  • Removable lower front window and sliding windows for excellent overall visibility.
  • Gas assisted front window slides up with minimal effort.
  • Sliding door system offers good access and maintains the machine’s compact dimensions, reducing the risk of damage.

Joystick Controls

The boom swing and auxiliary hydraulic functions are located at your fingertips providing smooth, easy operation. These joystick mounted controls deliver more productivity through precise movement of the boom swing and auxiliary functions. They also eliminate foot pedals and free up the floor for more room for the operator’s feet. 100% pilot controls provide consistent flow and pressure throughout the life of the machine. This also allows all controls to be locked out while starting the machine and when the safety lockout bar is in the up position.

Compass Display Panel

Unlock the new features and experience the value of the exclusive COMPASS control panel on the new E series Excavators. The brand new Complete Operation, Maintenance, Performance and Security System on the Caterpillar E series mini hydraulic excavators was specifically designed by Caterpillar for compact excavators. It adds several new features to the machines increasing the amount of customer value:

  • A Standard Anti-theft Security System
  • Adjustable Work Tool Auxiliary Flow Control
  • Continuous Flow
  • Economy Mode – save up to 20% fuel while maintaining high productivity with the push of a button.


All four E-Series models feature increased stability, while maintaining the compact radius design. This increased stability leads to more productivity and versatility through the use of heavier work tools and the optional long stick.

Fast, Powerful Digging With Load Sensing Hydraulics

High digging forces and fast cycle times deliver the productivity that your job demands. Load sensing hydraulics optimize flow for smooth, powerful performance and increased fuel efficiency.


High performance power train provides optimized engine horsepower and strong performance. Engine meets U.S. EPA Tier 4 Interim and EU Stage IIIA emissions requirements. Automatic engine idle automatically lowers engine revolutions when not in use to conserve fuel and lower environmental noise and emissions. The E-Series models feature an engine kill switch conveniently located in the cab and accessible from ground level.

Automatic Two Speed

With the standard automatic two speed feature, the machine will automatically balance high speed and torque travel requirements based on the conditions to give the operator the optimum speed and control. The machine can be put in low gear if slower travel is desired while in tight conditions.

200 Degree Bucket Rotation

Industry leading bucket rotation of over 200 degrees provides greater material retention during truck loading. It also allows for easier vertical wall digging without having to reposition the machine.


The Cat 305.5E CR delivers high performance in a compact radius design to help you work in the tightest applications.


Engine Model Cat® C2.4
Net Power 44.2 hp
Gross Power 45.7 hp


Operating Weight 11618.0 lb
Operating Weight with Cab 11938.0 lb