Bomag BW 900-2, Operating Instructions Manual

Page: 43 / 72

Maintenance
BOMAG
43
BW 900-2
5.2 Fuels and lubricants
Engine oil
Tto ensure perfect cold starting it is import to
choose the viscosity (SAE-class) of the engine oil
with respect to the ambient temperature.
Fig. 58
Lubrication oil with a too high viscosity index caus-
es starting difficulties. The temperature when
starting the engine is therefore of highest impor-
tance when choosing the viscosity of engine oil for
winter operation.
Oil viscosity
Since the viscosity of lubrication oil changes with
the temperature, the ambient temperature at the
engine's operating location determines the viscos-
ity class (SAE-grade) to be chosen (see diagram).
Occasional falling short of the temperature limit
(e.g. use of SAE 10W/30 down to -15 °C) may ef-
fect the cold starting ability of the engine, but will
not cause any engine damage.
Temperature related lubrication oil changes can
be avoided by using multi-purpose oils. The follow-
ing oil change intervals apply also when using mul-
ti-purpose oils.
Regular lubrication oil changes
The longest permissible time a lubrication oil
should remain in an engine is 1 months. If the fol-
lowing oil change intervals are not reached over a
period of 1 months, the oil change should be per-
formed at least every 3 months, irrespective of the
operating hours reached.
Oil quality
Lubrication oils are classified according to their
performance and quality class. Specifications ac-
cording to API (American Petroleum Institute) and
CCMC (Committee of Common Market Automo-
bile Constructors) are commonly used.
Permitted API-oils
SF/SG
Lubrication oil change intervals
SF/SG = 125 operating hours
Fuels
Quality
Use only commercial brand unleaded gasoline
with a pump octane rating of 86 or higher.
Hydraulic oil
The hydraulic system works with hydraulic oil
HV 32 (ISO) with a kinem. viscosity of 32 mm
2
/s at
40°C. For topping up or for oil changes use only
high-quality hydraulic oil, type HVLP according to
DIN 51524, part 3, or hydraulic oils type HV ac-
cording to ISO 6743/3. The viscosity index (VI)
should be at least 150 (observe information of
manufacturer).
Lubrication grease
For lubrication use only EP-high pressure grease,
lithium saponified (penetration 2).