COPYRIGHT © 2019 SANDVIK MINING AND CONSTRUCTION OY
Page 42 - Lubrication
Carrier hydraulic oil
RPV14R, RPV22R, RPV29R, RPV39R, RPV53R, RPV75R
Note: We strongly recommend the use of different hydraulic oils in the summer and
in the winter if there is an average temperature difference of more than 35 °C (95
°F). The correct hydraulic oil viscosity is thus ensured.
SPECIAL OILS
In some cases, special oils (for example biological oils and nonflammable oils) can
be used with the product Observe the following aspects when considering the use
of special oils:
■
The viscosity range in the special oil must be in the given range (1000-20 cSt).
■
The lubrication properties must be sufficient.
■
The corrosion resistance properties must be good enough.
Note: Although a special oil could be used in the carrier, always check its suitability
with the product Contact the oil manufacturer or your local dealer for more
information about special oils.
2.2 OIL COOLER
The carrier hydraulic system must be able to maintain a temperature within an
acceptable level during the product operation. This is because:
1. Seals, wipers, membranes and other parts manufactured from the corresponding
materials can normally stand temperatures up to 80 °C (176 °F).
2. The higher the temperature is, the less viscous the oil gets, thus losing its
capability to lubricate.
A standard carrier, with a proper product circuit, meets the requirements of the
necessary cooling capacity. If the oil temperature tends to be too high during
product operation, the following must be checked:
■
The product circuit pressure relief valve should not be opened unnecessarily.
■
The product circuit pressure drops must be reasonable; that is, less than 20 bar
(290 psi) in the hydraulic line.
■
There should be no internal leakages in product or carrier hydraulic pumps,
valves, cylinders, motors, etc.
If all of the above-mentioned items are in order, and the temperature of the hydraulic
oil still tends to be too high, extra cooling capacity is needed. Contact the carrier
manufacturer or your local dealer for details.