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Lube-Tips - How to choose the correct gear oil

05 May 2018


In order to choose the best lubricant for a gear set, the following criteria must be addressed:
  • Base Oil Type
  • Viscosity
  • Additives

Base Oil Type
Properties Mineral oil Synthetic Polyglycol Ester
Viscosity-Temperature behaviour
normal
good very good good
Ageing Resistance normal good very good good
Low-Temperature Characteristics poor very good good good
Wear Protection normal good very good good
Friction Coefficient normal good very good very good
Neutrality towards sealing materials and paints very good very good poor poor

Viscosity-Temperature Relationship
A flat VT- curve permits the use of one and the same viscosity of an oil at low and high temperatures.
 
Good ageing and oxidation stability 
These characteristics ensure adequate lubricant service life and use at high service temperatures.

Neutrality towards non-ferrous metals, paints and elastomers
The brass cages of rolling bearings, sliding bearing materials, interior paints as well as the elastomers and plastics which seals and viewing glasses consist of must not be affected by the lubricant. 

 
Viscosity
It is important to understand the methods for viscosity selection and the factors that affect the requirement.
 
The viscosity for a gear lubricant is primarily chosen to provide a desired film thickness between interacting surfaces at a given speed and load. Because it is difficult to determine the load for most viscosity selection methods, the load is assumed and the determining factor becomes speed.

The chart below is applicable to spur, helical and beveled enclosed gear sets. Other charts exist for worm gears and open gearing. To use this method, the type of gear set, gear geometry, operating temperature and the speed of the slow speed gear must be determined.

Determine gear oil viscosity chart based on speed


Additive
Extreme Pressure (EP) gear oils contain special additives that enhance their film strength or load-carrying ability. The most common EP additives are sulfur phosphorous, which are chemically active compounds that alter the chemistry of machine surfaces to prevent adhesive wear under boundary lubrication conditions.
 
In less severe applications, antiwear additives may also be used to provide wear protection under boundary lubrication conditions. 

Rust and oxidation inhibited (R&O) gear lubricants do not contain antiscuff additives or lubricity agents. R&O gear oils generally perform well in the categories of chemical stability, demulsibility, corrosion prevention and foam suppression. These products were designed for use in gearing operating under relatively high speeds, low loads, and with uniform loading (no shock loading).
 
boundary lubrication with extreme pressure, anti wear additve

Fuchs Renolin CLP Gear Oil (Germany)
https://www.davor.com.my/index.php?ws=ourproducts&cid=188389&cat=Gear-Oil&subcat=Fuchs#openproducts

Hi-Rev Gear Oil (Malaysia)
https://www.davor.com.my/index.php?ws=ourproducts&cid=188391&cat=Gear-Oil&subcat=Hi-Rev#openproducts

LUBTEX Gear Oil (UK)
https://www.davor.com.my/index.php?ws=ourproducts&cid=188392&cat=LUBTEX&subcat=LUBTEX

Contact our Sales Consultant in area Malaysia (Selangor(Klang, Shah Alam, Subang), Kuala Lumpur(Sungai Buloh), Sepang, Negeri Sembilan, Melaka, Johor(Johor Bharu,Muar,Batu Pahat), Pahang(Temerloh, Kuantan), Kelantan, Terengganu, Perak(Ipoh), Kedah, Perlis, Penang, Sabah, Sarawak), Indonesia, Singapore, Thailand, Philippines, Vietnam, Laos, Myanmar, Cambodia, Brunei at sales@davor.com.my. 


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