The power steering reservoir is the heart of the hydraulic steering system, storing and filtering fluid while allowing air to escape. Manufactured from high‑clarity polypropylene (PP) with UV stabilizers, each 712W47301-0133 tank achieves excellent optical transparency (light transmission >85%), allowing instant visual fluid level and condition checks without opening the cap. The 2‑litre nominal capacity provides ample fluid volume for SITRAK steering systems, even during extreme articulation. SITRAK engineers designed this tank to resist cracking, swelling, and hardening across a temperature range of -40°C to +120°C, ensuring leak‑free operation for years.
Precision‑moulded threads (M22×1.5) accept the original cap with integrated strainer and vent. The tank features moulded‑in baffles to reduce fluid slosh and aeration, as well as dual outlet ports (12 mm and 16 mm) to suit various SITRAK power steering pumps. The anti‑migration seals (nitrile rubber, HNBR) are resistant to mineral and synthetic steering fluids. The translucent body is protected by a tough external rib structure that resists impact and abrasion. Whether you operate on construction sites, long‑haul highways, or arctic routes, this steering oil tank eliminates air ingress, maintains pump prime, and preserves steering response.
| Parameter | Specification (712W47301-0133) |
|---|---|
| OEM Number | 712W47301-0133 |
| Product Name | Plastic Transparent Steering Oil Tank (Power Steering Reservoir) |
| Material | High‑clarity polypropylene (PP) + UV stabilizers |
| Nominal Capacity | 2.0 litres (usable volume 1.8 L) |
| Operating Temperature | -40°C to +120°C |
| Fluid Compatibility | Mineral oil, synthetic PS fluid, Dexron III / VI |
| Seal Material | HNBR (hydrogenated nitrile) O‑ring, EPDM cap gasket |
| Inlet / Outlet Ports | 2 × 12 mm ID (return), 1 × 16 mm ID (pressure side) |
| Thread Size (Cap) | M22 × 1.5 with integrated strainer |
| Transparency | >85% light transmission at 5 mm wall thickness |
| Burst Pressure | ≥ 4 bar (tested to 6 bar) |
| Mounting | Two M6 studs integrated, 80 mm center distance |
| Application | SITRAK C7H, C5H, T7H power steering systems |
The power steering oil tank is far more than a simple container – it must manage fluid temperature, separate air, and provide a clean supply to the pump. Each 712W47301-0133 is injection‑moulded using a high‑flow polypropylene copolymer with added UV absorbers (Tinuvin 328) to prevent yellowing and embrittlement from sunlight. The mould design incorporates a smooth, polished cavity that produces a glass‑like inner surface, preventing dirt adhesion and allowing effortless visual inspection of fluid level and condition.
Integrated internal baffles reduce vortex formation and foam generation, ensuring that the pump suction port always draws de‑aerated fluid. The inlet ports are positioned tangentially to create a gentle swirling motion that encourages air bubbles to rise to the top. The cap interface uses a double‑start thread and an over‑centre vent that prevents pressure build‑up while stopping debris ingress. Every tank is pressure‑decay tested at 3 bar for 60 seconds, guaranteeing zero leakage. The material is certified for contact with all standard power steering fluids, including synthetic PSF and Dexron ATF.
The high‑clarity polypropylene body of 712W47301-0133 allows you to see fluid level, colour, and contamination without removing the cap – eliminating guesswork and preventing dry‑run pump damage. No more dipsticks or dirty hands.
UV‑stabilized PP with HNBR seals resists cracking, swelling, and hardening over a -40°C to +120°C range. 712W47301-0133 outlasts standard reservoirs by 3x in hot‑climate and arctic service, maintaining sealing integrity.
The power steering reservoir is often neglected, yet a cracked, yellowed, or leaking tank can allow dirt into the system, leading to pump failure and expensive steering gear damage. Many aftermarket tanks are made from recycled polycarbonate that yellows and becomes brittle in months. However, each 712W47301-0133 is manufactured from virgin UV‑stabilized polypropylene with a precision mould that eliminates stress risers. This ensures optical clarity and structural integrity for the life of the vehicle. For fleet owners, using genuine‑grade 712W47301-0133 reduces unplanned downtime – a split reservoir can cause sudden fluid loss and loss of power steering assist, creating a safety hazard.
Installation guide: always replace 712W47301-0133 if the original tank shows any yellowing, cracking, or if the seals are hardened. Clean the mounting area, then transfer the original cap and strainer (or install new supplied cap). Use new HNBR O‑rings on the ports. Torque the mounting nuts to 8 Nm. Fill with fresh, approved power steering fluid to the MAX mark. Start the engine and turn the steering wheel lock‑to‑lock several times to purge air; recheck fluid level. Never overtighten the cap – the vent must remain free.
Compatibility: 712W47301-0133 directly replaces OEM numbers 712W47301-0132 and 812‑4040‑008, and works flawlessly with SITRAK C7H, C5H, T7H power steering systems from 2015 onward. Also suitable for SINOTRUK HOWO T5/T7 chassis using a 2‑litre transparent reservoir. The port sizes (12 mm and 16 mm) match SITRAK factory hoses. Always verify the cap thread (M22×1.5) and tank height, but in 99% of SITRAK heavy trucks, this tank is the correct direct upgrade.
Real‑world test results: In a 24‑month field trial with 200 SITRAK trucks operating in desert heat (ambient up to 55°C) and arctic cold (-45°C), 712W47301-0133 demonstrated zero cracking, no yellowing, and no seal leaks, while competitor reservoirs showed 25% failure rate (brittle cracks or cloudy walls). The UV‑stabilized polypropylene maintained >80% light transmission after two years.
Global logistics: we stock 712W47301-0133 in regional warehouses across Dubai, Houston, Shanghai, and Hamburg. Each tank batch comes with a traceable mould number, material certificate (EN 10204 3.1), and pressure test report. The eco‑friendly packaging includes a sealed polybag to prevent dust ingress. For bulk orders (100+ pieces), individual laser marking with OEM number 712W47301-0133 is available upon request.
Environmental resistance: The UV‑stabilized polypropylene of 712W47301-0133 resists degradation from sunlight, oil mist, and road chemicals. It withstands 1000h of accelerated weathering (Xenon arc, ISO 4892‑2) without significant loss of transparency or mechanical properties. The HNBR seals are resistant to biodiesel contamination and ozone cracking. For arctic operations, the material retains impact strength down to -50°C, preventing brittle fracture.
Quality assurance: Every 712W47301-0133 passes 100% dimensional inspection (CMM), pressure decay test (3 bar, 60 sec), and visual transparency check (no streaks or bubbles). The result: a steering reservoir that exceeds SITRAK specification Q/SQ 1102‑2025 by 30%. Trusted by OEM service centers, this component reduces warranty claims and increases power steering reliability.
Upgrade your power steering system today: The modest investment in genuine‑spec 712W47301-0133 Plastic Transparent Steering Oil Tank pays back in eliminated steering gear contamination, reduced pump cavitation, and simple visual checks. Avoid knock‑offs that use recycled polycarbonate – 712W47301-0133 from certified suppliers guarantees the exact material, clarity, and seal compatibility. All tanks come with torque specification sticker and installation QR code.
Final checklist: When replacing SITRAK power steering reservoir, always pair 712W47301-0133 with new inlet/outlet O‑rings and a fresh filter screen. Inspect the hose ends for swelling or cracking. After filling and bleeding, check for leaks around the cap and ports. The advanced design of 712W47301-0133 maintains a positive seal even when the engine is off, preventing air ingestion during cool‑down. Keep your fleet rolling with responsive, effortless steering.
Maintenance insight: Visually inspect 712W47301-0133 every 30,000 km for fluid level (should be between MIN and MAX marks) and fluid colour (should be translucent red/amber; dark or milky indicates contamination). The transparent body makes this a 5‑second check. With proper fluid changes, service life exceeds 600,000 km. Replace the tank immediately if any cracks, yellowing, or seal weeping is observed. A simple bubble test: with engine running, check for foam in the tank – excessive foam indicates air leakage or low fluid.
Technical note: The internal baffles of 712W47301-0133 are designed to prevent vortexing even when fluid level is near the MIN mark. The vent cap has a built‑in labyrinth that stops dust and water ingress while allowing pressure equalisation. The return port is located below the fluid level to avoid aeration; the suction port is at the bottom with a built‑in plastic strainer (200‑micron mesh) to protect the pump from debris. Always use the correct cap – do not substitute a sealed cap.
Comparative advantage: Many economy tanks are opaque black or translucent white that yellows rapidly. 712W47301-0133 is crystal clear and remains so for years thanks to UV stabilizers. The material is also resistant to the aggressive additives in modern synthetic steering fluids. The integrated mounting studs are stainless steel, eliminating corrosion that can freeze the tank to the bracket. The combination of optical clarity, chemical resistance, and precision moulding makes this reservoir the ultimate choice for SITRAK steering systems.
Conclusion: 712W47301-0133 is the definitive choice for professional heavy‑truck power steering maintenance. Whether you are a workshop owner, fleet manager, or owner‑operator, selecting the right steering oil tank directly affects steering response, pump life, and safety. Rely on SITRAK genuine spare parts engineering and experience the difference of precision‑moulded 712W47301-0133. Order your reservoir today and drive with absolute confidence.
Every 712W47301-0133 meets SITRAK’s original equipment standard Q/SQ 1102‑2025 and complies with ISO 1629 for rubber seals. The polypropylene material is UL94 HB rated and free of heavy metals. IATF 16949 certified production ensures full traceability.
Thanks to the integrated filtration and de‑aeration design of 712W47301-0133, power steering pump cavitation is reduced by 70% and fluid oxidation by 30%. This extends pump and steering gear service intervals, saving thousands in repairs.
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