Grader

PVH98 vickers hydraulic pump grader 120

The Eaton Vickers PVH98 hydraulic pump used in Caterpillar 120 graders is a variable displacement axial piston pump designed for high-pressure applications up to 280 bar. Its displacement ranges from 98 to 105 cc/rev depending on the swash plate angle, ensuring precise flow control between 120 and 180 liters per minute. The pump housing is made of high-strength alloy steel to withstand mechanical stress, while pistons and valves are precision-machined to maintain internal leakage below 2%. The PVH98 pump supports operating temperatures between -20°C and 90°C, and it requires ISO VG46 hydraulic oil for optimal performance.

During the repair process, the pump is removed and disassembled, with all components inspected for wear, scoring, or corrosion. Pistons, cylinder blocks, swash plates, and seals are replaced using OEM-certified parts. The shaft and rotor are balanced using dynamic testing to minimize vibration. Pressure and flow control valves are calibrated with high-precision gauges to ensure consistent hydraulic output within ±5% of factory specifications.

After reassembly, the pump undergoes bench testing under simulated load conditions. Flow and pressure are measured at various swash plate angles and temperatures to confirm adherence to technical specifications. Pr

CAT12G grader hydraulic pump

The CAT12G G120 grader hydraulic pump is a radial piston variable displacement pump with an operating pressure typically between 280 and 320 bar. The pump consists of a rotor, pistons, control valves, and pressure relief components, accurately regulating oil flow within ±5%. Under normal operation, the pump flow ranges from 140 to 180 liters per minute, and oil temperature should not exceed 90°C. Repairs require specialized hydraulic tools and flow/pressure calibration equipment to maintain the manufacturer’s technical specifications.

During the repair process, the pump is removed from the grader, and all components are inspected for wear, scoring, and corrosion. Pistons, rings, and seals are replaced with OEM-standard parts to reduce internal leakage below 2%. The shaft and rotor undergo vibration and balance testing to minimize noise and vibration. Control and pressure valves are tested with precise gauges to ensure smooth, stable flow.

After reassembly, the pump is tested under real pressure and flow conditions. Flow measurements at 75–85°C must stay within ±5 bar of the factory specification. Proper repair extends service life up to 8,000 hours and reduces oil consumption and hydraulic system wear. Routine maintenance every 500 operating hours, including pressur

Komatsu Motor Grader GD825A-2

The Komatsu GD825A-2 motor grader is equipped with an SAA6D140E-2 diesel engine producing 260 horsepower at 2000 RPM. The engine displacement is 8.3 liters, delivering a maximum torque of 1050 N·m at 1400 RPM. The hydraulic system features a 280 L/min pump with 220 bar working pressure, controlling blade, frame, and front attachments. The frame is made of high-strength steel with a bending resistance of 3200 N·m. The main blade measures 4 meters wide and 700 mm high, capable of moving highly compacted soil efficiently. The hydro-mechanical transmission with 6 forward and 3 reverse gears allows precise speed control up to 35 km/h.

The operating weight of the grader is 20.3 tons, and its overall length is 9.8 meters, ensuring stability and maneuverability. Front and rear axles feature independent differential locks with a load capacity of 8.5 tons. The cabin includes an ergonomic vibration-absorbing seat and air conditioning for enhanced operator comfort. The dual-circuit hydraulic braking system and adjustable hydraulic steering provide precise control on slopes and rough terrain. Fuel consumption is approximately 24 liters per hour, and the fuel tank capacity is 250 liters, ensuring high operational efficiency.

Komatsu Motor Grader GD655-6

The Komatsu GD655-6 motor grader is equipped with an SAA6D114E-3 diesel engine producing 215 horsepower at 2000 RPM. The engine displacement is 7.01 liters, delivering a maximum torque of 950 N·m at 1400 RPM. The hydraulic system features a 240 L/min pump with 210 bar working pressure, controlling all blade, moldboard, and front frame operations. The frame is made of high-strength steel with a bending resistance of 2800 N·m. The main blade, measuring 3.8 meters wide and 650 mm high, can cut and move highly compacted soil efficiently. The hydro-mechanical transmission with 6 forward and 3 reverse gears allows precise speed control up to 32 km/h.

The operating weight of the grader is 17.5 tons, and its overall length is 9.2 meters, ensuring stability and maneuverability. Front and rear axles feature independent differential locks with a load capacity of 7.8 tons. The cabin includes air conditioning and an ergonomic vibration-absorbing seat for operator comfort. The dual-circuit hydraulic braking system and adjustable hydraulic steering provide precise control on slopes and tough terrain. Fuel consumption is optimized at approximately 22 liters per hour, and the fuel tank capacity is 200 liters.

Caterpillar 16G grader exhaust

The exhaust system of the Caterpillar 16G grader is made from grade 304 stainless steel alloyed with nickel and chromium to ensure high resistance to heat, vibration, and corrosion. The system includes an exhaust manifold, reinforced mid-pipe, multi-stage silencer, and a 45-degree vertical outlet. The internal pipe diameter ranges from 85 to 100 millimeters, with a wall thickness of about 2 millimeters. The silencer features a multilayer ceramic fiber insulation structure that reduces engine noise by up to 42 decibels. All joints are TIG welded to prevent gas leakage and extend the system’s operational life.

In the design of the Caterpillar 16G grader exhaust, the gas flow path is aerodynamically optimized to maintain a pressure drop below 8 percent of engine output. The silicone-based surface coating withstands temperatures up to 920 degrees Celsius, preventing oxidation and discoloration. The total system weight ranges from 18 to 23 kilograms and allows direct mounting on the main grader chassis. A dual-layer thermal insulator in the midsection prevents heat transfer to the operator’s cabin and hydraulic system, improving operational safety and reliability.

HEPCO HG180C grader exhaust

The HEPCO HG180C grader exhaust is engineered to efficiently guide engine gases and minimize operational noise under heavy-duty conditions. The exhaust body is made from heat-resistant alloy steel with an Fe-Cr-Mo composition, capable of withstanding temperatures up to 720°C. The wall thickness ranges from 2.2 to 2.8 mm, coated externally with high-temperature corrosion-resistant silicone paint. The total exhaust length is approximately 910 mm, with an outlet diameter of 110 mm. Its multi-stage internal flow design reduces back pressure, improves gas flow, and enhances combustion efficiency.

The HEPCO HG180C grader exhaust features a dual-layer construction with 15 mm compressed rock wool insulation, minimizing heat transfer to the outer surface. The connection is reinforced with a 10 mm thick steel flange and sealed with a graphite gasket for durability. It provides vibration resistance up to 170 Hz and corrosion endurance tested for 1200 salt spray hours. The total exhaust weight is about 11.2 kg, designed for direct mounting on the engine manifold. This structure ensures extended lifespan, reduced emissions, and stable performance in demanding environments.

Caterpillar 14G grader exhaust

The exhaust system of the Caterpillar 14G grader is constructed from grade 304 stainless steel alloyed with nickel and chromium to ensure high resistance to heat and corrosion. The system includes an exhaust manifold, mid-pipe, multi-stage silencer, and a 45-degree curved vertical outlet. The internal pipe diameter ranges from 70 to 85 millimeters, with a wall thickness of approximately 1.8 millimeters. The silencer’s multilayer structure with ceramic fiber insulation reduces engine noise by up to 40 decibels. All joints are TIG welded to prevent gas leakage and enhance mechanical durability.

In the design of the Caterpillar 14G grader exhaust, gas flow is optimized so that back pressure remains below 7 percent of engine power. The high-temperature resistant surface coating withstands up to 900 degrees Celsius, preventing oxidation and metal discoloration. The total system weight is approximately 16 to 20 kilograms and allows direct installation on the main chassis. A dual-layer thermal insulator in the central section prevents heat transfer to the operator’s cabin and fuel system, improving safety and operational reliability.

ITR 15-hole grader blade

The ITR 15-hole grader blade is engineered to enhance cutting and leveling efficiency in road construction machinery. It is made of hardened alloy steel with tensile strength up to 900 MPa and surface hardness of 40-45 HRC. Each blade has standard dimensions and a service life exceeding 3000 operating hours under heavy-duty conditions. Fifteen precision holes with tolerances below 0.1 mm ensure uniform and secure attachment to the grader body. The blade’s design distributes forces evenly and reduces vibration during cutting.

The ITR 15-hole grader blade offers high wear resistance and can withstand compressive loads up to 15 tons. Each blade weighs approximately 48 kilograms, allowing quick installation and replacement using corrosion-resistant bolts and nuts. Manufacturing standards comply with ISO 4957, ensuring material quality and dimensional accuracy. This blade improves machine stability and enhances efficiency in excavation and leveling operations.

ITR 17-hole grader blade

The ITR 17-hole grader blade is engineered to enhance precision in cutting and leveling during excavation and road construction. It is made of hardened alloy steel with tensile strength up to 950 MPa and surface hardness of 42-48 HRC. Its service life exceeds 3500 operating hours under heavy-duty conditions. Seventeen precision holes with tolerances below 0.1 mm ensure uniform and secure attachment to the grader body. The blade’s design distributes forces evenly and reduces vibration during cutting and leveling.

The ITR 17-hole grader blade provides high wear resistance and can withstand compressive loads up to 18 tons. Each blade weighs approximately 55 kilograms, allowing quick installation and replacement using corrosion-resistant bolts and nuts. Manufacturing standards comply with ISO 4957, ensuring material quality and dimensional accuracy. This blade improves machine stability and enhances efficiency in excavation and ground leveling operations.

Types of superchargers for construction machinery: loaders, bulldozers, graders, and excavators

Superchargers for construction machinery include mechanical types Roots and Twin-Screw and turbochargers positive pressure to increase engine intake air volume. Operating pressure ranges from 0.5 to 2.5 bar, with outlet air temperatures up to 150°C. Airflow capacity varies between 500 to 5000 liters per minute depending on engine and machine type. Shafts and rotors are made of alloy steel with 55–60 HRC hardness, with maximum RPM up to 20,000 for turbos and 6,000 for mechanical superchargers.

Superchargers are equipped with double-sided bearings, high-pressure lubrication, and oil/air cooling systems to maintain engine temperature. Installation and tuning follow ISO 9001 and SAE J726 standards to ensure accurate air pressure and volume across all engine speeds. Components feature aluminum or hard chrome coating for wear and corrosion resistance, with a service life of up to 10,000 hours under industrial conditions.

components of a grader

The main components of a grader include the chassis, moldboard blade, diesel engine, hydraulic system, and tracks or wheels, all made from high-strength alloy steel to withstand operational weights up to 25 tons. Blade lengths typically range from 3.5 to 5.5 meters, heights from 0.5 to 1.2 meters, and blade rotation angles are adjustable between 25 and 35 degrees. The chassis, with thicknesses of 20 to 35 millimeters, is precisely welded to ensure high bending and torsional resistance.

The diesel engine delivers 150 to 350 horsepower with cylinder capacities of 5 to 12 liters, and the hydraulic system operates up to 250 bar. Hydraulic cylinders for blade movement and steering are made from forged steel alloys, with NBR or FKM seals preventing dust and water ingress. All components undergo non-destructive testing NDT and dimensional inspection up to 0.1 millimeters to ensure service life exceeding 12,000 hours.