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The STZ08102116 Hydraulic Oil Tank Cap is a precision sealing component engineered specifically for Sinotruk Sitrak parts systems, including the popular Sitrak C7H, C5H, and HOWO T7H heavy-duty truck models. This high-quality filler cap ensures a secure, leak‑tight seal on the hydraulic oil reservoir, preventing contamination, fluid loss, and pressure fluctuations that can compromise the performance of steering, suspension, and other hydraulic functions.
Engineered to meet the rigorous demands of heavy‑duty hydraulic systems, the STZ08102116 oil tank cap is manufactured from durable, heat‑resistant materials that withstand extreme operating pressures, temperature variations, and exposure to hydraulic fluids, ensuring consistent sealing performance and long‑term reliability over millions of kilometers.
Hydraulic Oil Tank Cap
Крышка масляного бака
| Parameter | Specification / Value |
|---|---|
| OEM Number | STZ08102116 |
| Product Name | Hydraulic Oil Tank Cap |
| Brand | SINOTRUK Sitrak |
| Material | High‑strength engineering plastic (PA66 + GF) / metal insert |
| Thread Size | M30 × 1.5 (standard Sitrak hydraulic tank port) |
| Seal Type | Integrated rubber O‑ring (NBR) |
| Pressure Rating | Up to 10 bar (145 psi) |
| Operating Temperature | -40°C to +120°C |
| Weight | Approx. 0.15 kg (0.33 lbs) |
| Application | Hydraulic oil reservoir filler port |
| Compatible Models | Sitrak C7H, C5H, HOWO T7H, A7, T5G, and other SINOTRUK trucks |
| Service Life | 100,000+ km (replace if O‑ring deteriorates) |
| Quality Standard | OEM‑grade, meets SINOTRUK factory specifications |
The STZ08102116 Hydraulic Oil Tank Cap is a small but essential component that seals the filler opening on the hydraulic oil reservoir of SINOTRUK Sitrak heavy‑duty trucks. This cap prevents contamination of the hydraulic fluid by dust, dirt, and moisture, while also maintaining the correct pressure within the tank. It also allows for easy filling and topping‑up of hydraulic oil during routine service. A secure seal is vital for the longevity of hydraulic pumps, valves, and actuators, as any ingress of contaminants can lead to premature wear and system failure.
Manufactured from high‑grade glass‑fiber‑reinforced polyamide (PA66+GF), the STZ08102116 cap offers excellent dimensional stability, heat resistance, and mechanical strength. The integrated rubber O‑ring provides a positive seal that prevents oil leakage and resists the effects of vibration and thermal cycling. This genuine OEM component is a direct replacement for the original factory cap, ensuring a perfect fit and restoring the sealing integrity of the hydraulic tank fill port.
Using the correct hydraulic oil tank cap is essential for system cleanliness and performance; a loose or damaged cap can allow contaminants to enter the hydraulic circuit, leading to valve sticking, pump wear, and reduced efficiency. The STZ08102116 cap eliminates these risks, providing reliable sealing, easy access, and long‑term durability for your Sitrak truck’s hydraulic system.
The STZ08102116 cap features a precision‑molded rubber O‑ring that creates a tight seal against the tank neck, preventing oil leaks and keeping contaminants out of the hydraulic fluid.
Constructed from glass‑reinforced polyamide (PA66+GF), the STZ08102116 cap withstands under‑hood temperatures up to 120°C, ensuring reliable performance in hot engine and hydraulic environments without warping or degrading.
The cap’s large, knurled grip allows for easy hand‑tightening and removal, making hydraulic oil level checks and top‑ups quick and convenient, even with gloves on.
Designed for heavy‑duty use, the STZ08102116 cap resists cracking, fading, and oil degradation, providing dependable service for over 100,000 kilometers under normal operating conditions.
Prevents Contamination: The STZ08102116 cap provides a tight seal that keeps dust, dirt, and moisture out of the hydraulic reservoir, protecting pumps, valves, and actuators from abrasive wear and corrosion.
Maintains System Pressure: By sealing the tank, the cap helps maintain the correct pressure in the hydraulic reservoir, preventing cavitation and ensuring stable oil delivery to the pump.
Reduces Fluid Loss: A secure seal prevents hydraulic oil from leaking out of the tank, reducing fluid consumption and the risk of low oil levels that can damage hydraulic components.
Easy & Convenient: The tool‑free design allows for rapid oil checks and refills, saving time during routine maintenance and reducing the risk of cross‑threading.
Cost‑Effective Maintenance: Replacing a worn or damaged cap with the STZ08102116 is a low‑cost preventive measure that avoids expensive hydraulic system repairs caused by contamination or fluid loss.
OEM Interchangeability: The STZ08102116 cap is a direct cross‑reference for multiple OEM part numbers, ensuring broad applicability across the SINOTRUK truck range.
Compatible Models:
The STZ08102116 cap is compatible with the standard hydraulic oil tank filler port used across the SINOTRUK heavy truck range. Always verify the thread size (M30 × 1.5) and O‑ring condition before installation.
Installation Tips & Best Practices:
The STZ08102116 hydraulic oil tank cap is produced using precision injection molding techniques that ensure consistent dimensions and high surface quality. The glass‑fiber‑reinforced polyamide (PA66+GF) material offers an excellent balance of strength, heat resistance, and dimensional stability, even at elevated temperatures. The integrated O‑ring is made from a specially formulated nitrile rubber (NBR) that resists hydraulic oil, heat, and aging, ensuring a long‑lasting seal.
Each STZ08102116 cap undergoes strict quality inspections, including dimensional checks, O‑ring hardness and compression set tests, and visual inspections for surface defects. The cap is also tested for resistance to oil immersion and thermal cycling to guarantee reliable performance in the harsh under‑hood environment of heavy‑duty trucks.
The cap’s knurled outer surface is designed for a secure grip, even with oily hands, and the thread form ensures quick and positive engagement. Every cap is marked with the OEM part number for easy identification and traceability, ensuring you receive a genuine, high‑quality component that meets SINOTRUK’s rigorous standards.
The STZ08102116 Hydraulic Oil Tank Cap from SINOTRUK Sitrak is the definitive choice for fleet operators and owner‑drivers who demand reliable sealing, easy maintenance, and long‑term system protection. As a genuine OEM‑grade component, it guarantees a perfect fit, consistent sealing, and peace of mind—backed by SINOTRUK’s engineering excellence and decades of experience in heavy commercial vehicle manufacturing.
Whether you are performing routine hydraulic oil changes or inspecting the system, the STZ08102116 cap delivers the performance and durability you need to keep your Sitrak truck’s hydraulic system operating at its best. Its proven design, premium materials, and exacting tolerances make it the smart choice for any hydraulic tank sealing application.
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