How To Select Hydraulic Oil?
How to select hydraulic oil?
There are a few guidelines for selecting proper hydraulic oil:
1. According to the working environment and condition, shown as the table.
Pressure: below 7MPa, Temperature: below 50 ℃ | Pressure: 7MPa ~ 14MPa Temperature: below 50 ℃ | Pressure: 7MPa ~ 14MPa Temperature: 50 ℃~ 80 ℃ | Pressure: above 14MPa Temperature: 80 ℃~ 100 ℃ | |
Indoor, fixed hydraulic system | HL | HL or HM | HM | HM |
Outdoor, cold air | HV or HS | HV or HS | HV or HS | HV or HS |
Underground, on the water | HL | HL or HM | HL or HM | HM |
Near heat or fire | HFAE, HFAS | HFB, HFC | HFDR | HFDR |
2. According to types of oil pump. Generally, gear pumps requires less wear resistance from the lubricating oil than vane pumps and piston pumps. Therefore, gear pumps could use HL or HM oil, while vane pumps or piston pumps should use HM oil.
