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Hydraulic Fluids
Hydraulic Fluids
The use of proper hydraulic oil is mandatory to achieve maximum performance and machine life. Use a clean, high
quality, anti-wear hydraulic oil with a viscosity index (VI) of 135 minimum. It should have a maximum viscosity of
500 cSt (2000 SSU) at startup (ambient temperature) and a minimum viscosity of 13 cSt (65 SSU) at the maximum
oil temperature (generally 80°F above ambient). Using hydraulic oils that do not meet these criteria may cause poor
operation and/or damage to the hydraulic components.
The following table specifies the oil temperature at various viscosities. Temperature rise of the hydraulic oil can vary
from 30° F to about 80° F over the ambient temperature depending on the pressure setting, age of the pump, wind,
etc. Exxon Univis N46 hydraulic oil is installed at our factory. The advantage of this oil is a wider temperature
range, however, this oil should not be used for continuous operation below 20° F. For use in extremely cold ambient
temperatures, we suggest Mobil DTE 11M, which can be used to –16° F. This oil should not be used for continuous
operation above 100° F (oil temperature).
TX02244-2-2-04
NOTE: This chart is based on pump manufacturer recommendations of 65 to 2000 SSU limits.
NOTE: Temperatures shown are fluid temperatures. – NOT ambient temperatures.
Hydraulic Fluids Characteristics
Manufacturer Fluid Name SSU SSU V.I. -20F -10F 0F 10F 30F 50F 70F 90F 110F 130F 150F Range
100F 210F °F
Mobil DTE 11M 87 40 145 ******************************************* -27-87
DTE 13M 165 48 140 ***************************************** 5-130
DTE 15M 225 53 140 ********************************************* 5-140
Exxon Univis N-32 177 49 164 ********************************************* 5-140
Univis N-46 233 55 163 ************************************* 25-142
Univis N-68 376 68 160 ************************************** 34-155
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