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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.


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