BA 9142 en 02/2015
10.7.1
Examine water content of oil, conduct oil analyses
Detailed information about testing the oil for water content or conducting oil analyses can be obtained from
your lubricant manufacturer or Siemens customer service.
─
A fresh sample of the used operating lubricating oil must be sent as reference to the testing institute
along with the used oil sample for analysis.
─
The oil sample must be taken downstream from the filter of the oil-supply system while the gear unit is
running. A suitable connection point is normally located upstream of the gear unit input (e. g. oil drain
cock in the pressure line). A suitable connection possibility is provided on the oil-supply system for
taking an oil sample from the filter.
─
A special sample container should be filled with the specified quantity of oil.
If there is no such sample container available, at least one litre of oil must be put in a
clean
, sealable
vessel that is safe for transport.
•
The viscosity of the oil sample may not deviate by more than 10 % from the that of the oil specified in
the "Technical data".
•
The oil purity should not be below -/19/16 according to the standard "ISO 4406".
•
Limit values for oil contamination.
Table 16:
Material-related contamination limit values of the oil
Material
Limit content
[ mg/kg ]
Possible source
Iron
(Fe)
40
Gear rim with internal teeth, teeth, bearing cage.
Chrome
(Cr)
+ 4
Rolling bearing, teeth.
Aluminium (Al)
+ 4
Oil-pump bearing.
Copper
(Cu)
+ 4
Cage of bearing.
Lead
(Pb)
+ 6
Plain thrust bearings, pump bearings.
Tin
(Sn)
+ 2
Plain thrust bearings, pump bearings.
Nickel
(Ni)
+ 2
Teeth.
Zinc
(Zn)
+ 10
Zinc-based primer (is sometimes used as additive). In this case
please contact Siemens.
Silicon
(Si)
+ 5
Concrete dust or other environmental factors, some oils may
contain silicium.
Water
(H
2
O)
300 ppm
Condensation water; water-oil cooler defective (mineral oil).
The values shown with "+" refer to the reference sample of the fresh oil.
