Hydraulic Oils

Hydraulic Oils: The Hidden Power That Extends Your Equipment’s Life

What is Hydraulic Oil?
Hydraulic oil is a special technical fluid that transfers energy through pressure in components such as hydraulic pumps, cylinders, and valves, while reducing friction and preventing wear of parts.

Main Functions:

• Transfer of energy and pressure

• Lubricating parts by reducing friction

• Distributing heat and providing cooling

• Protecting against corrosion and rust

• Resisting foaming, air bubbles, and contamination

Why is Choosing the Right Hydraulic Oil Important?

• Extends equipment lifespan: Inadequate or unsuitable hydraulic oil causes parts to wear out quickly.

• Reduces technical costs: With quality oil, failures, leaks, and part replacements are minimized.

• Improves performance: Pressure remains stable, and the system operates stronger and more reliably.

• Energy savings: Optimal viscosity ensures pumps and hydraulic systems work with less energy.

• Safety: Reduces risks of sudden shutdowns and pump damage.

Hydraulic Oil Standards and Types

• Main Standards:

  • ISO: HH, HL, HM, HV, HG, HS, etc.

  • DIN 51524: Part 1 (HH), Part 2 (HLP), Part 3 (HVLP).

• Types / Categories:

  • Mineral-based hydraulic oils – most common, suitable for standard conditions.

  • Synthetic hydraulic oils – resistant to wide temperature ranges, oxidation, and high pressure.

  • Biodegradable oils – environmentally friendly, used in water and forest areas.

  • High-viscosity index oils (ISO VG 32, 46, 68, etc.) – for stable performance across a wide temperature range.

Hydraulic Oil Selection – Key Criteria

1. Viscosity

   • Measured at 40°C and 100°C.

   • Lower viscosity for cold regions, higher viscosity for hot and heavy-duty systems.

2. Temperature Behavior

   • Pour point and resistance to oxidation at high temperatures are crucial.

   • Synthetic oils are more stable under temperature fluctuations.

3. Chemical Additives

   • Must include antioxidants, anti-corrosion, anti-wear, and anti-foaming additives.

4. Operating Pressure and Pump Type

   • Pump type (vane, piston, gear) and nominal system pressure define the choice.

5. Compliance with Standards

   • ISO/DIN certifications and test results (oxidation, rust, wear) must be verified.

Aminol Hydraulic Oil Types

1. HVLP Series

   • Provides viscosity stability across wide temperature ranges, long-lasting protection under high pressure.

   • Products: HVLP 15, 22, 32, 46, 68, 100, 150; HVLP 22/32/46/68 Zinc Free

2. HLPD Series

   • Disperses contaminants like water and dust, helping keep the system clean.

   • Products: HLPD 22, 32, 46, 68

3. HVLPD Series

   • Combines HLPD features with HVLP’s temperature stability.

   • Product: HVLPD 46

4. WR HLP Series

   • Water-resistant, designed for humid environments.

   • Products: WR HLP 32, 46, 68, 100

5. Xtreme Series

   • Ultra-performance oils for maximum loads and extreme temperatures.

   • Product: Hydraulic Xtreme 32 ULT

Technical Indicators & Selection Tips

• Viscosity (ISO VG):

  • VG 32–46: For cold climates and medium-pressure systems.

  • VG 68–150: For high temperatures and heavy-duty industrial equipment.

• Zinc Content:

  • Zinc-free models (HVLP Zinc Free) – cleaner operation, reduced environmental risk.

• Additional Additives:

  • Antioxidants, rust inhibitors, anti-foam agents, and friction modifiers.

Step-by-Step Selection Guide

1. Learn system parameters: pump type, operating pressure, climate.

2. Determine viscosity grade: ISO VG 32, 46, 68, etc.

3. Check chemical properties: anti-oxidation, anti-corrosion.

4. Verify standards compliance: ISO/DIN.

5. Evaluate price-quality ratio: cheap oils often lead to higher long-term costs.

Practical Tips

• Change oil on time, check filtration system regularly.

• Prevent mixing with water.

• Monitor oxidation at high temperatures.

• Check flowability in cold climates before starting equipment.

FAQ

• What is the difference between mineral and synthetic hydraulic oils?
  Mineral oils are cheaper, suitable for standard conditions. Synthetic oils are more stable across wide temperature ranges.

• What does ISO VG 46 mean?
  It refers to the kinematic viscosity range measured at 40°C.

• How are hydraulic oil prices determined?
  Prices vary by brand, viscosity, and additives. Quality oil is more cost-effective in the long run.