 Caterpillar' 120H Motor Grader |
The 120H blends productivity and durability to give you the best return on your investment. |
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Power Train
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Using advanced engine technology, the Cat 3116 delivers exceptional lugging performance, fuel efficiency, and engine power management. The power shift transmission features smooth, on-the-go shifting and electronic overspend protection. To increase productivity, the direct drive transmission has eight forward speeds and six reverse speeds. |
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| Hydraulics |
The load-sensing hydraulic system lowers horsepower consumption and system heat. The control valves provide low lever ert, balanced flow and consistent implement control |
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| Drawbar, Circle & Moldboard |
The blade linkage design enhances moldboard positioning. A long wheel base allows the operator to obtain an aggressive moldboard angle for better material movement. The rugged construction of the drawbar, circle, and moldboard, and use of replaceable wear inserts provide durability and minimize maintenance costs.
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| Operator's Station |
Well-positioned blade linkage, a tapered engine hood and optional ROPS cab with large windows ensure a clear view in all directions. A roomy operator station, low-effort controls and optional low sound level cab creates a more productive work environment.
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Serviceability |
All service areas are easily accessible. A modular design permits easy removal of power train components for servicing. Diagnostic capabilities allow fast servicing of the transmission. |
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| Power Train |
Matched cat components deliver smooth, responsive performance and reliability |
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Cat 3116 engine
responds to the need for fuel efficient, low emissions engines. |
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| Superior lugging performance |
High torque output and high torque rise make the 3116 engine very responsive. The engine's lugging capability allows it to pull through sudden, short-term increases in loads, reducing the need to downshift. As a result, the operator can maintain consistent, desirable working speeds, which means the work gets done faster. |
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Fuel efficiency |
Unit injectors deliver very high fuel injection pressures to ensure proper mixing of fuel and air. This very high injection pressure, coupled with the precise metering and timing of the fuel injection, results in superior fuel efficiency and reduced emissions. |
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| Long engine life |
A strong, rigid cylinder block, large-sized bearings and robust reciprocating parts are designed to withstand the rigors of high-pressure, low-emissions engines. |
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Engine power management |
delivers a full-rated net power of 104 kW (140 hp) in gears 4-8 forward. In lower gears, where the machine is traction-limited. engine horsepower is automatically reduced to 93 kW (125 hp). Engine power management works to lower fuel consumption as well as reduce tire slippage and wear in the lower gears.
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| Power shift transmission |
Caterpillar designs and builds transmissions specifically for Cat motor graders. The transmission provides on-the-go, fullpower shifting as well as inching capability.
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| Direct drive |
delivers superior fuel efficiency and better "feel" of blade loads, material hardness and ground speed.
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Gear selections |
Eight forward speeds and six reverse speeds give the operator a wide operating range. With four gear selections below 10 km/h (6 mph), the operator can precisely match working speeds to job conditions for maximum productivity in earthmoving applications.
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Electronic transmission control
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produces easy, smooth shifts, which enable the operator to maintain uniform surfaces if shifting is required. Smooth shifts also extend the life of the transmission by placing less stress on transmission clutches. A single lever controls direction, speed and the parking brake. |
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| Inching capability |
Low pedal effort and excellent modulation provide precise control of machine movements when using the inching pedal. This is especially important in finish grading or other close-quarter work where machine control is critical. |
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Oil-disc brakes |
Caterpillar designs and builds multi-disc brakes that are completely sealed and adjustmentfree. The brakes are oil-bathed, airactuated and spring-released. They are located at each tandem wheel to eliminate braking loads on the power train and to speed up servicing. The large brake surface provides dependable braking capability and long life before rebuild. |
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| Dual air system |
supplies braking capacity to each side of the machine. This system ensures secondary braking capability in the event a failure occurs in a single brake line. The dual air system also has a large reserve for stalled-engine braking. |
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Electronic overspend protection |
helps prevent engine and transmission damage from premature downshifting and grade-induced overspending. |
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Hydraulics |
Balanced hydraulics deliver consistent, precise and responsive control,
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| Power on demand. |
Normally, the variable displacement pump idles at near-zero output. When it senses a load requirement, the pump supplies flow and pressure to match the demand. The result is less hydraulic system heat and lower horsepower consumption. |
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Implement control valves |
Implement control valves are designed and built by Caterpillar specifically for motor graders. They provide outstanding operator "feel" and predictable system response for unmatched implement control. To help maintain exact blade settings, lock valves are built into all control valves. Line relief valves are also incorporated into selected control valves to protect the cylinders from over-pressurization.
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Low operator effort |
Implement controls are designed to reduce operator fatigue. They feature short lever throws and low effort in both directions. Properly spaced control levers and short lever throws allow the operator to use multiple controls with one hand. |
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| Balanced flow |
When the operator uses several controls at one time, flow is proportioned to ensure all implements can operate simultaneously. |
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Large independent oil supply |
Large independent oil supply prevents cross-contamination and provides proper oil cooling, which means less heat build-up and longer component life. |
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Drawbar, Circle & Moldboard |
| Every component is designed for maximum productivity and durability |
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| Blade positioning |
The blade linkage design enhances moldboard positioning. This blade linkage is most beneficial in ditch cutting and cleaning. |
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| Blade angle |
A long wheel base allows the operator to obtain an aggressive moldboard angle. This large blade angle permits material to roll more freely along the blade, which reduces power requirements. This is particularly helpful in dry or clay soils. |
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| Rugged construction |
The Y-frame drawbar is constructed of two solid beams. To resist wear, teeth on the circle are induction-hardened in the front section. For extra support, the circle is secured to the drawbar by four support shoes.
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Replaceable wear items.
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Replaceable wear inserts are located between the drawbar and circle and between the four support shoes and circle. This wear system helps keep components tight for fine grading and allows easy replacement. Caterpillar also uses replaceable wear items in the following areas: |
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Draftball surface |
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Blade lift and centershift cylinder sockets |
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Moldboard slide rails included with optional hydraulic sideshift |
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| Optional protection system |
To relieve high-impact loads, Caterpillar offers: |
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Circle drive slip clutch protects the drawbar, circle and moldboard from horizontal shocks when an object is hit near the toe or heel of the blade. This option is most useful in applications where hidden objects are frequently encountered. |
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Serviceability |
Conveniently placed service points make routine maintenance quick and easy. |
| Easy access to service areas speeds up maintenance and ensures that routine service is performed on time |
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Large hinged doors are optional and provide easy access to the engine and radiator service points. Spin-off oil filters can be changed quickly. |
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Lubrication points for the articulation joint are remote-mounted. |
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Disconnect switch and air cleaner are located on the left side, making them easy to access. |
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Fuse panel is located at the base of the steering console. Its cover clearly identifies circuits and fuse sizes. |
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Tandem oil check point is conveniently located between the wheels in the center of the tandem |
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Service meter is located on the left side of the steering console, giving the operator a clear view from the ground |
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Power train components
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Power train components feature a modular design so you can remove the engine, transmission or parking brake independently for quicker servicing. |
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| Diagnostic capabilities |
Diagnostic capabilities offer fast servicing of the transmission. Diagnostic tool-connection plug allows the system to be checked quickly and easily. The transmission's electronic control module automatically records and saves any system faults for later analysis. |
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XT hose |
Caterpillar designs and manufactures its own heavy-duty XT hose and installs it in all high-pressure circuits. Its resistance to abrasions, coupled with its exceptional strength and flexibility, help minimize maintenance and extend life. |
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| O-ring face seals |
O-ring face seals create a reliable seal and are used in all hydraulic circuits to minimize the possibility of oil leaks. |
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Separate wiring harnesses |
connect all electrical components. This modular harness design provides simple disconnects for major machine repairs or rebuilds. The wires are also color coded and numbered to speed up diagnosis and repairs. Sure-Seal connectors are made of weather resistant materials that protect against moisture, corrosion and abrasion. |
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| Environmentally Responsible Design |
Caterpillar builds machines that help you crate a better world |
The H Series motor graders respond to important environmental problems such as noise and air pollution. Today's machines run smoother, quieter and cleaner than ever before. |
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Quiet cab.
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With the optional sound suppressed cab and engine compartment doors, the interior sound level does not exceed 75 dB(A) when tested using SAE J919 standards and 77 dB(A) when tested using ISO 6394 standards. The rubber-mounted engine and transmission transmit less engine noise and vibrations to the operator.
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Quiet machine |
With optional engine compartment doors, the drive-by exterior sound level will not exceed 81 dB(A) when tested at rated engine speed using SAE J88 standard test and 110 dB (A) when tested at rated engine speed using ISO 6393 standard test. This quiet operation enables the machine to work with minimal disturbance to the surrounding environment.
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| Low emissions |
Engine performance has been maintained while reducing the amount of particulates and nitrogen oxides released into the air. |
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| Dry machine |
Lubricant fill points and filters are designed to minimize spillage. O-ring face seals, XT hose and Cat hydraulic cylinders protect against leaks. |
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Complete Customer Support |
Cat dealer services help you operate longer with lower costs.
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Your Cat dealer offers a wide range of services that can be set up under a customer support agreement when you purchase your equipment. The dealer will help you choose a plan that can cover everything from machine and attachment selection to replacement, to help you get the best return on your investment. |
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Selection |
Make detailed comparisons of the machines you are considering before you buy. How long do components last? What is the cost of preventive maintenance? What is the true cost of lost production? Your Cat dealer can give you precise answers to these questions.
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Purchase |
Look past initial price. Consider the financing options available as well as day-to-day operating costs. Resale value is another item to consider when purchasing a Cat motor grader. This is also the time to 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.
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Operation |
Improving operating techniques can boost your profits. Your Cat Dealer has training videotapes, literature and other ideas to help you increase productivity. |
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| Maintenance. |
More and more equipment buyers are planning for effective maintenance before buying equipment. Choose from your dealer's wide range of maintenance services at the time you purchase your machine. Repair option programs guarantee the cost of repairs up front. Diagnostic programs such as Scheduled Oil Sampling and Technical Analysis help you avoid unscheduled repairs. |
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| Product support. |
You will find nearly all parts at our dealer parts counter. In the rare case when we don't have a part in stock, we will get it to you fast. |
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| Replacement. |
| Repair, rebuild or replace? Your Cat dealer can help you evaluate the costs involved so you can make the right choice. |
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Core Business Interests |
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