Komatsu GD755-5R Motor Grader

The GD755-5R features a Komatsu-built transmission with eight forward and eight reverse gears, offering a wide operating range suitable for diverse grading applications and terrains.

It offers two driving modes: auto mode using a torque converter for better low-speed control and manual mode for direct drive, providing efficient operation at higher speeds.

Auto mode allows smooth operation without engine stalling even at low speeds, enhancing control during fine grading or working on surfaces requiring delicate adjustments.

Manual mode provides high transport speed and strong direct drive efficiency, ideal for fast travel between job sites or high-speed snow removal operations.

The transmission uses electronic controls for smooth shifting, minimizing jarring transitions that could disrupt grading quality and also reducing stress on the transmission system.

Komatsu’s overspeed protection prevents damage by inhibiting premature downshifting or grade-induced overspeeding, contributing to overall transmission longevity and operator safety.

The GD755-5R features a load-sensing closed-center hydraulic system with a variable displacement piston pump that ensures proportional oil flow based on demand.

Hydraulic output is consistent and efficient, with the system providing up to 193 L/min at rated engine speed, supporting simultaneous multi-function implement operation.

Multifunctional control valves with float and Pilot Check Valve (PCV) provide precise implement control, critical for accurate grading and fine surface finishing.

Implement controls are positioned for low operating effort and are ergonomically spaced to allow the operator to manipulate multiple levers with minimal arm movement.

Blade lift accumulators are available to absorb shocks when the moldboard encounters hidden obstacles, reducing stress on components and enhancing operator control.

Moldboard angle and geometry are designed for aggressive cutting and material rolling, improving productivity by reducing resistance and power consumption during earthmoving tasks.

The grader is powered by the Komatsu SAA6D125E-5 engine delivering up to 213 kW (286 HP) net, with optimized performance across different gear ranges.

The engine uses a high-pressure common rail fuel injection system that improves combustion efficiency while reducing emissions to comply with EU Stage II standards.

Its Variable Horsepower Control (VHPC) system adjusts power delivery based on demand, boosting performance at medium to high speeds without sacrificing fuel economy.

An air-cooled aftercooler and efficient turbocharger contribute to cleaner emissions and enhanced engine responsiveness under varying load conditions on challenging job sites.

The hydraulic fan is driven based on demand, reducing parasitic power losses and engine noise, especially beneficial during light-load or idle operations.

With an emphasis on fuel efficiency, the engine management system adjusts speed based on workload, significantly reducing unnecessary fuel consumption and operational cost.

The machine features large lockable hinged service doors providing easy access to key areas like the engine, radiator, and fluid refill points for daily maintenance.

A centralized fuse panel located inside the cab allows easy identification of circuits, helping technicians quickly diagnose and resolve electrical issues with minimal downtime.

Engine oil, transmission, and coolant drains are placed conveniently for fast fluid changes, contributing to shorter maintenance cycles and reduced servicing effort.

Spin-on type filters are used for quicker replacements, making preventive maintenance tasks cleaner and less time-consuming compared to conventional screw-on units.

Modular design of major components like the engine, transmission, and final drives allows independent removal, simplifying major repairs and reducing disassembly time.

Adjustment-free sealed oil disc brakes eliminate the need for regular adjustments and are submerged in oil, resulting in extended service intervals and increased reliability.

The GD755-5R features a spacious, low-profile ROPS/FOPS-certified cab with high visibility and a wide-angle design for unobstructed views in all directions.

A suspension seat with adjustable settings provides enhanced comfort, while fold-up armrests and a retractable seatbelt ensure safety during long working hours.

The adjustable control console and tilt steering wheel allow customization of the workspace for different operator preferences and ease of entry and exit.

Well-placed air conditioning vents maintain cab comfort in all weather conditions, reducing fatigue and helping the operator stay focused throughout their shift.

The machine is equipped with a low-effort inching pedal, especially beneficial for operators accustomed to manual graders, allowing precise machine control at low speeds.

Interior amenities such as built-in storage, lunch box tray, coat hooks, and cup holders contribute to a more user-friendly and productive working environment.

The machine’s quadrangle cab design with well-positioned pillars and tapered engine hood ensures maximum visibility of the moldboard, tires, and rear implements.

A full-color electronic monitoring system provides real-time alerts and system diagnostics, helping the operator respond quickly to abnormalities and reduce unplanned downtime.

The RPM mode selector allows the operator to fine-tune engine speed using Auto, Manual, or Off settings, automatically adjusting when throttle is overridden.

Rearview visibility is further enhanced by the cab’s elevated seating position and optional rear camera systems, supporting safer reversing in confined areas.

A rotating beacon, backup alarm, and clearly labeled indicator lights enhance job site safety and operator awareness, especially in busy or dimly lit environments.

The cab structure is equipped with defrosters, intermittent wipers, and safety-tinted glass to support visibility and operator protection in varying weather conditions.