101S Series Load-Sensing Fully Hydraulic Steering System – The Ideal Replacement for OSPC

101S Series Load-Sensing Fully Hydraulic Steering System – An Ideal Replacement for OSPC

The 101S series load-sensing fully hydraulic steering system is a cost-effective steering control solution for agricultural machinery, construction machinery, and special vehicles. Functionally fully compatible with the OSPC LS series, and with performance parameters meeting international standards, this series is an ideal replacement for OSPC steering systems. It is widely used in the steering control systems of low-speed heavy-duty vehicles such as tractors, loaders, forklifts, combine harvesters, road rollers, marine machinery, forestry machinery, and road maintenance machinery.

The product's main displacement ranges from 50ml/r to 400ml/r, with a maximum input pressure of 17.5MPa, a maximum continuous back pressure of 2.5MPa, and a manual steering torque ≤130N·m. It offers multiple functional modes, including ON (open-core non-responsive), CN (closed-core non-responsive), OR (open-core responsive), and LS (load-sensing), to meet the configuration requirements of different hydraulic systems.

I. Correct Use of the 101S Steering Units

1. Installation Points

Before installation, confirm that the product specifications match the main system, including displacement, connection method, and valve configuration. During installation, tighten the connecting bolts to the specified torque value and apply appropriate thread-locking adhesive to prevent loosening due to vibration. If the rocker arm position needs adjustment during installation, first remove the corresponding steering limiter adjusting screw on the steering gear. After adjustment, reinstall with a torque of 12±3 N·m. Throughout the entire operation, strictly avoid introducing foreign objects into the steering gear. Before connecting the hydraulic lines, ensure the pipeline is clean and free of impurities, and that the oil viscosity meets system requirements.

2. System Configuration

The 101S series steering gear can be used with a fixed displacement pump, a constant pressure multi-displacement pump, or a load-sensing pump (a variable pump with combined flow and pressure compensation) to form different configurations of load-sensing hydraulic steering systems. Plate-mounted models (e.g., 101S-5, 101S-5L, 101S-5E) can be used with PVF* type priority valves via plate-mounted connection; pipe-mounted models (e.g., 101S-5T) must be used with DYXL or YXL type priority valves via pipe-mounted connection, and the system safety valve must be located on the priority valve. During installation, please strictly follow the product drawings and instructions for pipe connection.

3. Operating Precautions

When the steering wheel is turned, the valve core rotates a small angle, the spring is pressed down, causing the valve sleeve to rotate. The valve core and valve sleeve separate at a certain angle, thus connecting the oil circuit. The linkage shaft drives the rotor in the stator to rotate, delivering hydraulic oil proportional to the steering wheel angle to the flow amplification valve. When rotation stops, the spring causes the valve sleeve and valve core to automatically return to center, closing the oil circuit. Before starting the system, check the oil level and bleed the pipes to prevent air from entering and causing steering lag or instability.

II. Common Problem Troubleshooting and Repair Methods

1. Heavy Steering

Possible Causes: Insufficient hydraulic oil or air in the hydraulic system; clogged reservoir filter; malfunctioning oil pump regulating valve; damaged power steering piston sealing ring or valve body radial sealing ring groove center sealing ring; excessive valve clearance or improper closure.

Troubleshooting Steps: Check oil level and add oil → Clean filter → Bleed air → Check oil pump and seals. Replace damaged seals immediately.

2. Oil Leaks at Steering Gear Joints

Common oil leakage points include the joints between the valve body, diaphragm, stator, and rotor, as well as the journal or relief valve seal.

Repair Methods: For oil leaks at joints, replace the seal, clean the joints, or tighten bolts; for damaged journals or relief valve seals, replace the corresponding seals directly.

3. Unresponsive Steering or Unstable Power Steering

Possible Causes: Air in the hydraulic system; worn internal steering gear parts causing increased clearance; blocked LS signal hydraulic system or abnormal pressure signal.

Troubleshooting Steps: Exhaust air → Clean the oil circuit → Check if the LS oil port pressure signal is normal → If internal wear is severe, disassemble and repair or replace the steering gear.

4. Maintenance Tips

After disassembly and cleaning, check the gears and rack for wear and damage, and the housing for cracks. Note: Parts on the steering gear must not be welded or straightened; they must be replaced. It is recommended to simultaneously check the thrust bearing, sector gear shaft, and needle roller bearing during maintenance. If damage, dents, rust, or cracks are found, replace them immediately. If internal damage is severe, it is recommended to replace the entire steering gear to ensure system safety.

III. Product Advantages Most Concerning to Dealers

1. Fully Comparable to International Brands, Worry-Free Replacement

The 101S series has the same appearance, internal structure, and performance parameters as the OSPC**LS series, and can directly replace mainstream series products such as OSPC, M+S HKUS, and Eaton 401. Dealers do not need to adjust their existing solutions; replacement is convenient and has high customer acceptance.

2. Highly Integrated Design, Leading Cost-Effectiveness

This series integrates the safety valve, two-way overload valve, two-way replenishing valve, and inlet check valve all within the steering gear housing, eliminating the need for additional connecting valve blocks. This makes it more convenient to use, and the connection dimensions conform to international standards. Fewer parts mean lower procurement costs, a simplified assembly process, and a lower failure rate.

3. Multiple Functional Configurations, Wide Coverage

The product offers four modes: ON (open-core no response), CN (closed-core no response), OR (open-core response), and LS (load sensing). With over ten specifications ranging from 50ml/r to 400ml/r, it can adapt to various application scenarios, from light agricultural machinery to heavy-duty construction machinery. Distributing one model can serve multiple market segments, resulting in high inventory turnover efficiency.

4. Stable Supply Chain, Controllable Delivery Time

As the source manufacturing plant, we have stable production capacity and a comprehensive quality control system. Distributors can enjoy stable supply guarantees and flexible ordering policies, eliminating the worries of stockouts and supply disruptions.

5. Fast After-Sales Response and High Profit Margin

Compared to the lengthy after-sales cycles of European and American brands, we offer rapid response and timely parts supply, helping distributors reduce after-sales maintenance costs. A reasonable ex-factory pricing system ensures distributors have ample profit margins.

IV. What problems can I solve for you?

For Distributors – Helping you quickly open up the market

The 101S series perfectly replaces the OSPC series. Your existing OSPC customer resources can be directly converted, without the need to acquire new customers. I provide you with a stable supply, competitive prices, and timely after-sales response, helping you improve customer satisfaction and repurchase rates.

For OEM Manufacturers – Helping you optimize your supply chain

What you need are core hydraulic components with reliable performance, consistent parameters, and stable delivery times. The 101S series fully conforms to international standard connection dimensions and can directly replace the original OSPC configuration without modifying the main unit design. We support customization based on provided drawings; everything from mounting hole positions to oil port types can be adjusted as needed, helping you reduce procurement costs and optimize your supply chain layout.

For Repair Service Providers – Making Repairs More Efficient

The biggest fears in the repair market are unavailability of parts, opaque pricing, and long delivery times. The 101S series steering gears are interchangeable with the OSPC series. We have a complete range of displacement specifications and valve configurations, with ample stock and fast delivery. From standard parts to customized valve assemblies, we offer a one-stop shop, significantly reducing your repair waiting time and enhancing your service reputation.

V. Welcome to Purchase from Us in China

We are a professional hydraulic steering gear manufacturer located in Shijiazhuang, Hebei Province, China. With years of experience in the R&D and production of fully hydraulic steering gears, our products are SGS/BV certified. We supply multiple series of fully hydraulic steering gears, including 101S, OSPC, OSPB, HKUS, 060, 102S, 103S, and BZZ-B, with complete specifications. We can also undertake OEM/ODM customized orders.

Choosing to source directly from our factory in China will give you: competitive factory prices, professional technical support, and a stable supply guarantee. Our products are exported to many countries and regions worldwide, and are widely used in agricultural machinery, construction machinery, marine machinery, forestry machinery, and other fields, enjoying a high level of customer trust.

We welcome global distributors, OEM manufacturers, and service providers to visit our factory in China to discuss cooperation. Whether you need sample testing, technical consultation, or bulk purchases, we will serve you with a professional attitude and high-quality products.

Contact us now to obtain our product catalog and quotation!

For the latest product specifications and quotations, please contact our sales staff directly to obtain the official product manual and business terms.