USER
MANUAL
914NG
A
NNEXES
E.33
7845285-06 03/20
subject to change without notice
E.5
SELECTION OF HYDRAULIC OIL
Viscosity is one of the most important properties of hydraulic oils because it affects the hydraulic
sealing and the functionality of the safety valves. Therefore the oil temperature is very important
because even small changes in temperature affect viscosity: as the temperature increases, viscosity
decreases. The following table shows the effect of temperature on oil viscosity.
STARTING AND OPERATING VISCOSITY RANGE
STARTING AND OPERATING TEMPERATURE RANGE
Max allowable viscosity at startup
1000 cSt
Min allowable viscosity during crane operations
10 cSt
Recommended operating viscosity
12 to 100 cSt
Min starting oil temperature
(environmental temp.) T
env
Operating temperature range
T
oil
ISO VG 32
-10 °C
17 to 67 °C
ISO VG 46
-5 °C
25 to 77 °C
ISO VG 68
3 °C
32 to 80 °C