Steering

Loader steering valve repair

The steering control valve in Volvo, Komatsu, and Hyundai loaders is a critical component of the hydraulic steering system, responsible for controlling oil flow and pressure to the steering cylinders. These valves are typically high-pressure, double-acting designs capable of withstanding operating pressures between 200 and 260 bar. Internally, they feature pistons, springs, and precisely machined housings with tolerances below 0.05 millimeters, enabling accurate oil flow control and precise steering shaft movement. Selecting the correct valve and maintaining the specified flow rate for each loader model is crucial to prevent vibration and premature wear of hydraulic components.

The mounting location of the steering valve is usually on the outlet path of the hydraulic pump, near the input shaft of the orbital steering unit. This position allows the valve to receive direct hydraulic pressure and transmit force accurately to the steering cylinders. The valve is connected to pressure and return lines using flange couplings and high-pressure-resistant O-rings. Improper alignment or installation can lead to leakage, reduced flow, and increased shaft vibration, shortening the lifespan of the hydraulic components.

The repair process for the steering valve involves disassembling the

forklift orbitrol steering unit repair

The Orbitrol steering unit in tractors and forklifts is responsible for converting hydraulic oil pressure and flow into mechanical movement of the steering shaft. This unit is typically high-pressure, double-acting, and capable of handling operating pressures between 180 and 260 bar. Its internal design includes pistons, springs, valves, and precisely machined housings with tolerances below 0.05 millimeters, allowing accurate oil flow control and precise steering shaft movement. Selecting the appropriate unit and maintaining the specified flow and pressure for each tractor or forklift model is crucial to prevent vibration and premature component wear.

The mounting location of the Orbitrol steering valve is usually on the hydraulic pump outlet path, near the input shaft of the steering unit. This position allows the valve to receive direct hydraulic pressure and transmit force accurately to the steering cylinders. Pressure and return lines are connected with high-pressure O-rings and flange couplings to prevent leakage and flow reduction. Improper alignment or installation can cause increased steering shaft vibration and reduced lifespan of hydraulic components.

The repair process for the Orbitrol steering unit involves disassembling the assembly, thoroughly cleaning all com

orbital steering unit repair

The Orbital Steering Unit is a precise hydraulic system designed to convert linear hydraulic oil movement into rotational motion of the steering shaft. This unit is commonly used in heavy machinery, tractors, and combines, and can handle operating pressures between 180 and 250 bar. Its internal design includes multi-channel pistons, control valves, and housings with tolerances below 0.05 millimeters, enabling force transmission with minimal friction and leakage.

The mounting location of the orbital steering unit is usually on the input shaft of the steering system, near the hydraulic pump. This position allows the unit to receive direct hydraulic pressure and transmit precise motion to the output steering shaft. Pressure and return lines are connected with high-pressure-resistant O-rings and flange couplings. Any leakage or misalignment at this point can cause increased vibration, reduced steering precision, and premature bearing wear.

The repair process for an orbital steering unit involves disassembling the unit, inspecting piston wear, valves, and housing, and measuring tolerances with a digital micrometer. If cracks or wear greater than 0.05 millimeters are detected, component replacement is mandatory. After reassembly, the unit must be tested on a hydraulic bench at 20

hydraulic steering pump

The hydraulic steering pump is designed for a flow capacity of 80 to 120 liters per minute and an operating pressure of 120 bar. The body is made of high-strength aluminum alloy with low weight. Variable displacement is adjustable via the pressure control valve, providing volumetric efficiency above 92 percent. The pump shaft can withstand torque up to 250 Nm and features high concentricity to minimize vibration. The internal lubrication system includes gears and bearings with a minimum friction coefficient of 0.02. The pump has corrosion-resistant bolts and a heat-resistant coating up to 120 degrees Celsius.

This pump is compatible with various automotive and industrial hydraulic steering systems. Standard flange and shaft dimensions allow quick installation without structural modifications. The permissible operating temperature ranges from -30 to +90 degrees Celsius, with vibration resistance up to 15g. Hydraulic fluids with viscosity between 15 and 68 mm²/s are recommended. Overall system efficiency exceeds 88 percent, and noise levels are under 68 dB. All internal components comply with ISO 6344 and withstand a test pressure 1.5 times the working pressure.

ITR steering pump

The ITR steering pump is engineered with advanced hydraulic design to provide consistent pressure and smooth flow in heavy machinery hydraulic steering systems. It is a fixed-axis piston pump with variable displacement, allowing precise control of oil output volume. The operating flow ranges from 50 to 120 liters per minute at 2000 rpm, with a working pressure up to 28 MPa. The housing is made of hardened aluminum alloy with corrosion and heat-resistant coating. Multi-stage sealing with NBR and PTFE O-rings prevents leakage and increases volumetric efficiency up to 88%.

The ITR steering pump features a splined input shaft with tolerances below 0.02 mm and high-pressure resistant industrial bearings. The total weight is approximately 18 kilograms, supporting horizontal and vertical installation in hydraulic circuits. Its precise internal design reduces vibration and noise during operation. All components are manufactured according to ISO 4413 and SAE J1176 standards, ensuring long-term durability and consistent performance of the hydraulic steering system.

Hydraulic pumps and steering pumps

Hydraulic pumps and steering pumps for construction machinery are made from alloy steel or hardened aluminum, designed to withstand pressures up to 350 bar and operating temperatures of 120°C. Pump flow rate varies from 10 to 150 liters per minute depending on system type and capacity, with shaft rotation speeds ranging from 500 to 4500 rpm. Internal blades or gears are hard-chrome coated and lubricated with hydraulic oil, achieving up to 95% efficiency and minimizing wear.

Pump inlet and outlet connections are designed according to SAE and ISO standards, including flanges, nuts, and precise sealing washers. Hydrostatic and dynamic pressure testing is performed, with vibration resistance up to 1500 mm/s. Internal anodizing or hard chrome coating increases service life up to 5000 hours while ensuring corrosion and industrial heat resistance.

Volvo loader steering hydraulic pump

The Volvo loader steering hydraulic pump is made of alloy steel and durable aluminum, supporting operational pressures up to 250 bar. Pump flow rate ranges from 45 to 110 L/min, and shaft tolerance is ±0.02 mm to minimize internal leakage and maintain volumetric efficiency above 92%. Internal gears or pistons are heat-treated to 55–60 HRC surface hardness to reduce wear and friction.

Internal lubrication channels and cooling grooves maintain operating temperature between 65 and 95°C. Radial and axial bearings rated for 1,500 N control vibration and axial forces. Pump weight is approximately 12–16 kg, with service life up to 5,000 hours under standard conditions. Corrosion-resistant coating and hardening ensure long-term, stable performance.

dana spicer steering lift truck axle

Dana Spicer brand steering axles can be supplied for all types of forklifts with different configurations. Very high maneuverability and speed conversion in wide ranges are among the technical specifications of the Dana Spicer American brand forklift steered axles. Fast and low-cost service is one of the other benefits of using Dana Spicer axles and gearboxes on all types of load handling machines, including reach stackers and forklifts.
In addition to forklifts, this Dana Spicer guided axle series is used on all kinds of drilling and mining drills, all kinds of loaders, all kinds of combines and agricultural machines, and huge observatory telescopes. Rahsaz Market Industrial Group is the importer of all Dana Spicer turbine and gearbox equipment in Iran.