Hydraulic oil is not just a fluid for power transmission; it is a vital component that
lubricates,
cools, seals, and cleans every part of the system. Choosing the right hydraulic
oil directly affects the life and performance of your pumps and valves.
Did You Know?
70% to 80% of hydraulic system
failures
are
caused by incorrect oil selection or contamination. Regular analysis and correct
selection
are the cheapest insurance for your system.
1. Understanding Viscosity (ISO VG)
Viscosity is the most important property of hydraulic fluid. If the viscosity is too
low,
the oil
film thins, causing metal-to-metal friction and leakage. If it is too high, pump
cavitation
occurs and energy consumption increases.
| ISO Class |
Kinematic Viscosity (40°C)
|
Typical Application Areas
|
| ISO
VG
32 |
28.8 - 35.2
cSt
|
Cold
climates,
mobile equipment, precision machine tools. |
| ISO
VG
46 |
41.4 - 50.6
cSt
|
Standard
industrial
usage (Injection molding, Presses). |
| ISO
VG
68 |
61.2 - 74.8
cSt
|
High
temperature
environments, heavy duty iron-steel industry. |
2. Mineral vs. Synthetic Oils
While mineral oils perform adequately in standard conditions, synthetic oils are
indispensable
for fire resistance or extreme temperature ranges.
- Mineral Oils (HLP): Economical, high lubrication capability,
suitable
for
general use.
- Synthetic Oils (HEES/HFD): High fire resistance, long life,
environmentally
friendly.
"The cleanest oil is the cheapest spare part. In hydraulic systems, 1 gram of dirt
causes 1
ton of damage."
— BRS PROSES Engineering Team
3. Monitoring and Maintenance (NAS 1638)
Don't Mix!
Mixing different brands or types of oil can cause
chemical
reactions that disrupt the additive structure and clog filters. Always clean the
storage
tank when changing oil.
We recommend periodic analysis to monitor the health of your oil. Parameters such as
particle
count (NAS 1638 / ISO 4406) and water content determine the life of your equipment.
4. BRS PROSES Oil Maintenance Checklist
- Check oil level and temperature
daily
- Check filter pollution
indicators
weekly
- Comprehensive oil analysis
(Viscosity,
Water, Particle) every 6 months
- Clean tank breathers Annually
- Check for leakage at connections
