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The 40050400556 Hydraulic Return Filter is a premium filtration component engineered for the hydraulic systems of SINOTRUK Howo heavy‑duty trucks, ensuring clean fluid returns to the reservoir and protecting the entire hydraulic circuit from contamination. As a trusted supplier of genuine Sinotruk howo parts, we offer this OEM‑grade return filter as a direct replacement for the original factory unit. The 40050400556 hydraulic return filter effectively captures wear particles, contaminants, and debris generated during system operation, preventing them from re‑entering the pump and causing cavitation, scoring, and premature failure, even under the most severe operating conditions.
Engineered with a high‑density pleated synthetic media and a robust, corrosion‑resistant steel housing, the 40050400556 hydraulic return filter delivers exceptional filtration efficiency, removing particles down to 10 microns while maintaining low pressure drop. Its advanced design incorporates a bypass valve to ensure uninterrupted fluid flow during cold starts or when the filter reaches its dirt‑holding capacity, preventing system damage and ensuring reliable performance.
OEM 40050400556 • Return line application • 10‑micron efficiency • Synthetic media • Direct OEM fit
The 40050400556 is a premium hydraulic return filter designed specifically for the return lines of hydraulic systems in SINOTRUK Howo trucks, including the popular A7, T7H, and mixer chassis, as well as other heavy‑duty models that require this filter specification. This filter plays a critical role in maintaining hydraulic fluid cleanliness by capturing contaminants generated by pumps, valves, and actuators before the fluid returns to the reservoir.
The 40050400556 return filter features a high‑density pleated synthetic medium that offers excellent dirt‑holding capacity and filtration efficiency, with a nominal rating of 10 microns. The media is reinforced with a metal support core to withstand pressure surges and ensure structural integrity. Its steel outer shell is corrosion‑resistant and designed to handle return line pressures, preventing collapse and maintaining flow.
An integral bypass valve is set to open at a differential pressure of 2.5 bar, ensuring that fluid continues to flow even when the filter element is fully loaded, preventing system damage. The filter also includes a robust anti‑drainback valve that retains fluid in the housing when the system is off, allowing immediate pressure buildup on startup.
Common signs of a clogged return filter include sluggish system response, unusual noises from the pump, increased operating temperature, and reduced system efficiency. Replacing the filter with the 40050400556 restores full system responsiveness, reduces component wear, and prolongs fluid life. This OEM‑spec filter is the ideal choice for preventative maintenance and system overhauls.
Whether you are performing routine servicing or troubleshooting a hydraulic performance issue, the 40050400556 Hydraulic Return Filter delivers the reliability, efficiency, and durability that SINOTRUK Howo professionals expect.
The 40050400556 hydraulic return filter is specifically designed for SINOTRUK Howo trucks equipped with hydraulic systems, including power steering, suspension, tipping cylinders, and fan drives, as well as the widely used A7, T7H, and mixer chassis. It is a direct OE replacement and is fully compatible with all factory filter heads and fluid connections.
This filter is essential for applications where hydraulic systems operate under high stress, such as construction, mining, and heavy hauling. In these environments, hydraulic fluid can quickly become contaminated with wear particles, silicon dust, and moisture, leading to valve sticking, pump cavitation, and reduced system efficiency. The 40050400556 provides the filtration performance needed to maintain fluid cleanliness to ISO 4406 standards.
When replacing the return filter, it is recommended to inspect the filter head, fluid lines, and reservoir for signs of sludge or metal debris. The 40050400556 is compatible with all standard hydraulic fluids, including mineral oils, synthetic oils, and biodegradable fluids, offering versatility for fleet operators.
For fleets with multiple Howo trucks, standardizing on the 40050400556 simplifies inventory management and ensures the correct filter is available for scheduled services. Always verify the filter thread and dimensions on your specific truck to confirm compatibility, though the 40050400556 is the standard return filter for most Howo heavy‑duty models.
Replacing the 40050400556 hydraulic return filter is a straightforward procedure that can be performed by most technicians using standard hand tools. Begin by relieving the hydraulic system pressure and placing a suitable container under the filter to catch any spilled fluid.
Remove the old filter by turning it counterclockwise with a filter wrench. Clean the mounting surface on the filter head, ensuring the old gasket is completely removed. Apply a thin film of clean hydraulic fluid to the new filter’s gasket to ensure a proper seal. Screw the new 40050400556 filter onto the head until the gasket contacts the sealing surface, then tighten an additional ¾ to 1 full turn (or to the manufacturer’s torque specification of 18‑22 Nm).
After installation, top up the fluid reservoir to the correct level, then start the engine and operate the hydraulic functions to purge air from the system. Check for leaks around the filter and inspect the fluid level again.
For maintenance, replace the return filter at every recommended service interval, typically every 1,000 operating hours or annually, whichever comes first. In severe duty applications (dusty or wet environments), more frequent replacement may be necessary. Regularly check the filter condition by monitoring system response or using a pressure differential gauge if equipped. Keep a log of filter changes to track maintenance schedules and identify trends in fluid contamination.
The 40050400556 hydraulic return filter is manufactured in an ISO 9001‑certified facility using advanced pleating, bonding, and assembly processes. The synthetic filter media is sourced from leading global suppliers and is tested for efficiency, dirt‑holding capacity, and burst strength. The steel housing is formed from high‑grade cold‑rolled steel and coated with a durable anti‑corrosion layer that withstands salt spray and chemical exposure.
Each filter undergoes rigorous quality control checks, including media integrity testing, bypass valve calibration, anti‑drainback valve function verification, and leak testing under pressure. Random samples from each production batch are subjected to endurance testing on a hydraulic test bench to validate filtration performance, pressure fatigue resistance, and structural durability over the filter’s service life.
We back the 40050400556 with a comprehensive 12‑month warranty against material and workmanship defects. Our commitment to quality ensures that every filter delivers the same level of protection and performance as the original equipment, giving you confidence in your hydraulic system’s reliability.
Choose genuine filtration for your Howo – choose the 40050400556 Hydraulic Return Filter.
The 40050400556 Hydraulic Return Filter is a critical component for maintaining the performance and longevity of your Howo’s hydraulic system. Contaminated fluid can cause pump wear, valve sticking, and reduced system efficiency, leading to costly repairs and downtime. By replacing your return filter with this OEM‑spec unit, you ensure that your hydraulic fluid remains clean as it returns to the reservoir, protecting all downstream components.
Engineered with a high‑efficiency synthetic media and a robust steel housing, the 40050400556 offers outstanding particle capture, high flow capacity, and reliable bypass protection, making it ideal for the demanding conditions of heavy‑duty trucking. Its integrated anti‑drainback and bypass valves ensure consistent performance and protection against cold‑start and clogging scenarios.
Fleet operators benefit from reduced component failures, improved system responsiveness, and lower maintenance costs. Owner‑operators gain peace of mind knowing their hydraulic system is protected by a filter that meets strict OEM standards and is backed by a comprehensive warranty.
Invest in the 40050400556 and ensure your SINOTRUK Howo’s hydraulic system delivers reliable performance and long service life.
Order your 40050400556 today and keep your hydraulic system running smoothly.
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