
QAY220 All Terrain Crane Operation Manual
7-13 Hydraulic oil description
The suitable temperature for hydraulic system working is about 60
℃
. When the temperature is
more than 80
℃
, the volume efficiency of power parts (gear pump) and the sealing performance in
hydraulic system will lower sharply, especially under idle engine. Consequently result in hydraulic
system faulty; and when the temperature is lower than -20
℃
, hysteresis of hydraulic system will occur.
In practical working, select open and close of hydraulic oil radiator as well as viscosity according to
environmental temperature and working conditions. Refer to the Fig. 7-2 for working temperature
related to environmental temperature when select hydraulic oil.
Example: when environmental temperature is X
℃
, the working temperature in hydraulic system
oil tank is 60
℃
, optimum viscosity range is in shaded area, corresponding viscosity grade is VG46 or
VG68, the VG68 should be selected.
7-9
Fig. 7-2
Hydraulic system
Chapter 7
Note: the viscosity and temperature range shown in Fig. 7-2 is for L-HM hydraulic oil. The
application range of L-HM hydraulic oil is between that of AE46 anti-wear hydraulic oil and HS22
hydraulic oil.
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