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What Is Anti Wear Hydraulic Fluid? AW Additives Explained
Anti-wear hydraulic fluid is hydraulic oil carrying additives that chemically bond to metal surfaces and form a thin sacrificial layer at the points where the oil film gets too thin to keep parts apart. The additives wear away instead o...
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AW 46 Hydraulic Oil Equivalent: How to Verify One
An oil is a genuine AW 46 equivalent when it matches on four things: the ISO 3448 viscosity grade of 46, the anti-wear service family (HM under ISO 6743-4), the performance specification the equipment requires, and any pump-manufacturer...
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AW32 vs AW46 vs AW68 Hydraulic Oil: How to Choose the Grade
AW32, AW46 and AW68 are labels that differ in one published property: viscosity grade. The number is the ISO viscosity grade measured at 40°C: AW32 sits in a window of 28.8–35.2 mm²/s, AW46 in 41.4–50.6 mm²/s, and AW68 in 61.2–74.8 mm²/...
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Why Grease Hardens, Softens or Bleeds: The Direction Is the Diagnosis
Open a bearing housing and what was NLGI 2 six months ago is now one of three things: a dark brittle crust, a runny mess sliding off the shaft, or a firm puck sitting in a pool of its own oil. Most troubleshooting guides list "causes of...
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Water in Hydraulic Oil: The Contaminant You Can’t Always See
Oil turns cloudy and everyone notices. By then the water has been at work for a while, because the damage starts long before the milkiness appears, at concentrations you cannot see at all. Water is arguably the most underestimated conta...
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Hydraulic System Overheating: Find the Cause in the Right Order
Heat is the quiet killer of hydraulic systems, and it kills twice. It ages the oil. As a rule of thumb, oxidation roughly doubles for every 10°C above about 60°C, so an oil rated for thousands of hours can be spent in a fraction of that...
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ISO Viscosity Grades: A Grade Is a Window, Not a Number
Most people read ISO viscosity grades like "ISO VG 46" as "this oil is 46." It is not. VG 46 is a band: any oil whose kinematic viscosity at 40°C falls between 41.4 and 50.6 cSt qualifies. That ±10% window is deliberate, and misreading ...
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GL-4 vs GL-5: Why the Higher Number Can Destroy Your Gearbox
Here is a rule that runs against every instinct: pouring GL-5 into a gearbox that specifies GL-4 is not an upgrade. It can be damage. The number does not mark a quality tier. It marks an additive level tuned for a different kind of gear...
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Lubricants Sourcing: How to Find and Vet Reliable Suppliers
Quick answer The safest way to source lubricants is to qualify the supplier before negotiating price. Define the equipment specification, shortlist 3–5 suppliers, verify certifications and OEM approvals, request batch-specific CoAs, ...
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