9 - 1
Hydraulic Fluids
Hydraulic Fluids
The use of proper hydraulic fluid is mandatory to achieve maximum performance and machine life. Use a clean, high
quality, anti-wear hydraulic fluid 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
fluid temperature (generally 80
°
F above ambient). Using hydraulic fluids that do not meet these criteria may cause
poor operation and/or damage to the hydraulic components.
The following table specifies the fluid temperature at various viscosities. Temperature rise of the hydraulic fluid
can vary from 30
°
F to about 80
°
F over the ambient temperature depending on the pressure setting, age of the
pump, wind, etc. Mobil Univis N46 hydraulic fluid is installed at our factory. The advantage of this fluid is a wider
temperature range, however, this fluid should not be used for continuous operation below 24
°
F.
NOTE: The Mobil DTE 10 Excel series replaced the DTE 10M Series. The Exxon Univis N series are now Mobil Univis N.
TX03082-2-26-14
NOTE: This chart is based on pump manufacturer recommendations of 13 to 500 cSt.
NOTE: Temperatures shown are fluid temperatures. – NOT ambient temperatures.
Hydraulic Fluids Characteristics
Manufacturer Fluid
Name cSt cSt V.I. -20F
-10F 0F 10F 30F 50F 70F 90F 110F 130F 150F
Range Range
100F
210F
°
F
°
C
Mobil
10 Excel 15 15.8 4.1 168 ***********************************************
-16 - 113 -27 - 45
10 Excel 32 32.7 6.6 164 *********************************************
12 - 154 -11 - 68
10 Excel 46 45.6 8.5 164 *********************************************
23-173 -5 - 78
10 Excel 68 68.4 11.2 156 ******************************************* 37-196 3 - 91
Univis N-32 34.9 6.9 164 ********************************************
12-150 -11 - 66
Univis N-46
46
8.5 163 ********************************************
24-166 -4 - 74
Univis N-68
73.8 12.1 160 ***************************************** 39-193 4 - 89
