120H Motor Grader

3126B DITA ATAAC Engine

The innovative Cat 3126B diesel engine delivers large-engine performance from a compact engine design. The six-cylinder engine is turbocharged and air-to-air aftercooled. With high displacement and low rated speed, this engine provides excellent fuel economy and durability that can significantly reduce operating costs.

Power Shift Transmission

Designed and built specifically for Cat motor graders, the rugged transmission provides on-the-go, full-power shifting as well as inching capability.

Brakes

Caterpillar multi-disc brakes offer a large surface area for dependable, extended-life braking. The air-actuated service brakes, located in each of the four wheel spindle housings, are sealed, adjustment free, and lubricated and cooled by tandem housing oil. The parking/emergency brakes, located in the transmission on the output shaft, are spring actuated and air pressure released. When engaged, they neutralize the transmission and lock the wheels on any surface.

Load Sensing Hydraulics

A load sensing variable displacement pump and the advanced proportional priority pressure-compensating (PPPC, or "triple-PC") hydraulic valves provide superior implement control and enhanced machine performance and efficiency. Continuously matching hydraulic flow and pressure to power demands creates less heat and reduces power consumption.

Implement Control Valves

PPPC valves have different flow rates for the head and rod ends of the cylinder. This insures consistent extension and retraction properties for each cylinder, and improves operator 'feel' and system response. All control valves use lock valves to maintain blade settings. Line relief valves protect cylinders from excessive pressure.

Balanced Flow

Hydraulic flow is proportioned to ensure all implements operate simultaneously. If demand exceeds pump capacity, all cylinders are reduced by the same ratio. The result is improved productivity in virtually any application.

Blade Float

Blade float, incorporated into the blade lift control valves, allows the blade to move freely under its own weight. By floating both cylinders, the blade can follow the contours of the road when removing snow. Floating only one cylinder permits the toe of the blade to follow a hard surface while the operator controls the slope with the other lift cylinder.

Independent Oil Supply

Large separate hydraulic oil supply prevents cross-contamination and provides proper oil cooling, which reduces heat build-up and extends component life.

Heavy Duty XT™ Hose

Caterpillar hose technology allows high pressures for maximum power and reduced downtime, and intelligent routing minimizes exposure to damage.

Optional Hydraulic Lockout

Mechanically locks all moldboard, machine, and attachment control levers during machine roading. This prevents implements from being accidentally engaged when the motor grader is travelling down the road.

Blade

Heat treated moldboard rails, through-hardened, curved DH-2™ steel cutting edge and end bits, and replaceable metallic wear inserts assure a long, reliable service life. Three sideshift mounting locations for the optional moldboard add flexibility.

Blade Positioning

The blade linkage design provides extensive moldboard positioning, most beneficial in mid-range bank sloping and in ditch cutting and cleaning.

Circle Construction

One-piece forged circle with hydraulically driven motor stands up to high stress loads. Raised wear surfaces prevent circle teeth wear against the drawbar. Sixty-four uniformly spaced teeth on the front 240° of the circle are flame cut and heat induction hardened to resist wear. And the circle, with 360° rotation, is secured to the drawbar by four vertically and horizontally adjustable shoes for maximum support.

Drawbar Construction

The Y-frame drawbar is constructed of two solid beams for high strength and optimum durability, as well as precise blading control.

Blade Lift Accumulators

These optional blade lift accumulators absorb vertical shocks encountered when the moldboard contacts immovable objects. This option is especially useful in rough grading and rocky areas.

Integrated Bumper

The integrated bumper ties the rear frame together into a cohesive unit, to handle the loads possible with the new 3126B power train. This is especially important in ripping and snow removal applications where graders are equipped with snow wing attachments.

Rear Frame

Rear frame has two box-sectioned channels integral with fully welded differential case for a solid working platform.

Front Frame

Continuous top and bottom plate construction provides consistency and strength. The flanged box section design removes welds from high stress areas, improving reliability and durability, and increasing resale values for the customer.

Comfort and Convenience

Comfort and convenience are designed into every feature of the operator's station.

Exceptional Visibility

The narrow operator's console provides good forward visibility. Large side windows allow a clear view of the moldboard heel and tandem tires. A wide rear window and tapered engine hood provide a good view to the rear of the machine. The position of the air dryer and air cleaner, and the alignment the precleaner and muffler, provides good visibility to the rear of the machine. Operators can work more confidently and efficiently.

Service Center

Gathering many of the frequently serviced items into a ‘Service Center’ on the left side greatly improves access, and helps ensure proper maintenance and inspection routines, The result is better machine availability and lower operating costs.

• Large hinged doors provide easy access to the adjacent engine and maintenance service compartments.
• Engine and hydraulic oil checkpoints, coolant gauges, and air filters
• Spin-on filters for oils, fuel, coolant
• Remote lubrication points, purge valves and ecology drain lines
• Fuse panel with new automotive style fuses located inside cab
• Sample ports for engine, hydraulic, transmission fluids, coolant and fuel, encourages preventive maintenance and diagnostics like the S•O•SSM analysis program.

Fuel Tank

A 340 L (90 gal) ground level fuel tank allows longer work shifts and reduces refueling times. A fuel tank sediment drain enables the operator to remove sediment accumulation, reducing the risk of fuel system damage.

Extended Fluid Change Interval

Operate a full 500 hours between engine oil and filter changes, 4,000 hours between hydraulic oil changes, and 12,000 hours between engine coolant changes. This reduces downtime and operating expense.

Cat XT Hose

Caterpillar XT hose technology allows high pressures for maximum power and reduced downtime, and intelligent routing minimizes exposure to damage.

O-Ring Face Seals

Cat O-ring face seals assure rock-solid connections that maintain pressure and reduce oil leaks. Intelligent hose routing minimizes exposure to damage, increasing hose life and enhancing reliability.

Radiator Cleanout Access

Radiator clean-out access gives the operator the ability to clear away debris and other materials that build up around the radiator. This ensures that the radiator functions properly keeping the engine cool and increasing component life.

Quiet Cab

The resiliently mounted engine and transmission provide interior sound levels of 76dB(A) when measured with the doors and windows closed per ISO 6394. Lower interior noise levels improve operator working conditions.

Quiet Machine

Exterior sound level of 107dB(A) when tested per ISO 6395, Annex B. The optional sound suppression group complies with the EU 2000/14/EC sound limit of 107 dB(A). This quiet operation lets the 120H work with minimal disturbance to the surroundings.

Low Emissions

The 120H Motor Grader is even more environmentally friendly than its predecessors with reductions in NOx, hydrocarbon, and particulate emissions. It meets or exceeds all U.S. EPA Tier II and EU Stage II emissions control standards worldwide.

Dry Machine

Lubricant fill points and filters are designed to minimize spillage. O-ring face seals, Cat XT hose and Cat hydraulic cylinders protect against leaks.

Ozone Protection

To help protect the earth's ozone layer, air-conditioning units use a refrigerant free of chloroflourocarbons (CFCs).

Product Support

You will find nearly all parts at our dealer parts counter. Cat dealers use a world-wide computer network to find in-stock parts to minimize machine down time. Save money with genuine Cat Reman parts. You receive the same warranty and reliability as new products at substantial cost savings.

Machine Selection

Make detailed comparisons of the machines under consideration before purchase. Cat dealers can estimate component life, preventive maintenance cost, and the true cost of lost production.

Purchase

Look past initial price. Consider the financing options available as well as day-to-day operating costs. Look at dealer services that can be included in the cost of the machine to yield lower equipment owning and operating costs over the long run.

Customer Support Agreements

Cat dealers offer a variety of product support agreements, and work with customers to develop a plan that best meets specific needs. These plans can cover the entire machine, including attachments, to help protect the customer's investment.

Operation

Improving operating techniques can boost your profits. Your Cat dealer has videotapes, literature and other ideas to help you increase productivity, and Caterpillar offers certified operator training classes to help maximize the return on your machine investment.

Maintenance Services

Talk to your dealer about the range of available maintenance services. Repair option programs guarantee the cost of repairs up front. Diagnostic programs such as S•O•SSM Analysis and Coolant Sampling and Technical Analysis help avoid unscheduled repairs.

Replacement

Repair, rebuild or replace? Your Cat dealer can help you evaluate the cost involved so you can make the right choice.