Hydraulic Rock Drill COP RR14 / SC14 Ver. C 11 Lubrication
55 No: 4124851851.2.9007203379904011 en-US
11 Lubrication
11.1 Hydraulic and Lubricant Recommendations
11.1.1 Hydraulic Fluid
The hydraulic fluid of rock drill, in addition to containing decent lubrication properties,
should provide superior protection against wear, rust and oxidation, as well as good an-
tifoaming, water resistance, and air separation properties. For a hydraulic fluid, it is essen-
tial to have high shear stability, to ensure that viscosity and viscosity index remain con-
stant, even at high-pressure drops over sealing gaps and valves. The use of an appropri-
ate hydraulic fluid with proper viscosity, guarantee minimum energy losses in hydraulic
systems.
There are various hydraulic fluids to fulfil all limit values of viscosity as required for different
operating conditions and ambient temperatures. Various types of oils across these ranges,
may differ from mineral to synthetic based. Epiroc recommends the use of hydraulic fluids,
which conform to standards ISO 11158 HM, DIN 51524 HLP/HVLP and ISO 15380 (for en-
vironmentally friendly hydraulic fluids and biodegradable options).
Hydraulic fluids shall be chosen in relation to operational requirements and varying temper-
ature ranges. It is important to select a hydraulic fluid of the correct viscosity (VG), suited to
your operating temperature and environment. Viscosity is highly affected by temperature. A
high viscosity index (VI), reduces the effect of temperature on the hydraulic fluid. The fol-
lowing table can be used to choose an appropriate viscosity grade (VG) and viscosity index
(VI), based on your needs:
Normal Operat-
ing Temp °C
Viscosity 25-50
cSt
Min. Start Temp
°C
Max. Operating
Temp °C
Viscosity Grade
VG
ISO 3448
Viscosity Index
VI
+50 to +70 +5 +80 ISO VG 100 Min. 100
+45 to +60 -5 +75 ISO VG 68 Min. 100
+35 to +50 -10 +65 ISO VG 46 Min. 100
+25 to +40 -15 +55 ISO VG 32 Min. 100
+10 to +25 -25 +35 ISO VG 15 Min. 100
!
NOTE: In compliance with ISO 4406, the hydraulic fluid must be filtered to the purity
class of 20/18/15.
If viscosity is too low:
• The hydraulic fluid may not form a lubricating layer between surfaces, thus increasing
the risk of wear.
• The hydraulic fluid can leak past seals more easily in the rock drill, causing fluid losses
and increasing energy requirements.
If viscosity is too high:
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