System Maintenance; Inlet Filter (Between Fluid Reservoir And Charge Pump); Changing The Oil; Leak Test - Sauer Danfoss 20 Series Service Manual

INLET FILTER (BETWEEN
FLUID RESERVOIR AND
CHARGE PUMP)

CHANGING THE OIL

LEAK TEST

CLEANLINESS

CHECKING OF THE OIL
LEVEL

RECOMMENDED OILS

10
Series 20 – Axial Piston Motors
Service Manual and Repair Instructions

System Maintenance

The filter element must be exchanged as soon as the pressure drops below 0.75 bar
[10.9 psi] absolute (-0.25 bar [-3.6 psi]) when the transmission is at normal operating
temperature.The filter must also be exchanged each time the pressure fluid is changed.
Filtration grade = 10 µm [394 µinch] nominal.
Under normal operating conditions, the oil should be changed at the following intervals:
The first oil change should be carried out after max. 80-100 hours of operation but at the
latest one year after first-time operation.The second change should take place after max.
500 hours of operation but at the latest one year after the first change.
Thereafter, the oil should be changed at least every 1000 hours of operation or at least
once a year.
To change the oil, the used fluid must be drained off when the system is at operating
temperature! Remove any residual dirt or sludge from the reservoir!
In extremely dusty atmospheres, the intervals between oil changes must be correspon-
dingly shortened.
Oil samples should be taken every 500 hours of operation.To do this, take approx. 0.5l
of oil from a point on a level with the inlet (suction) connection. Fill the sample into a
closable container that is free of residues.
Have the oil examined for serviceability by Sauer-Danfoss, by Oil Manufacturer or by an
appropriate institution.
Important: Use only recommended oils! (See Fluid Manufacturers,Technical Information).
It is not permissible to mix oils.
Carry out a leak test on the transmission (inlet line, filter, pipe and hose lines and connec-
tions, valves, control elements, pump and motor) giving due consideration to the service
life of the transmission, environmental protection and reduction of oil consumption.
Tighten up any leaking joint and other connections while the system is not under
pressure.
Make certain that the air filter for ventilation of the oil reservoir is regularly cleaned,
since the input pressure may be affected if it is dirty. If there is an oil cooler, the cooler
surface should be kept free from contamination. On units which have hose couplings
on the connecting pipes, contamination of any sort must be avoided. Cotton rags or lint
cleaning cloths may not be used for cleaning. Use only lint-free materials.
When changing the oil, be sure the area around the filler cap is free from foreign objects.
The oil, which can be kept clean by using a filter cloth, should be added by means of
a clean funnel.
The level of the oil should be checked daily using the gauge glass. In case of loss of oil,
the leak must be rectified.
Important: Use only recommended fluids! (See Fluid Manufacturers,Technical Informa-
tion.) It is not permissible to mix.
HLP - hydraulic fluids according to DIN 51524
ATF - automatic transmission fluids type A, SUFFIX A
HD - SAE motor oils
see Sauer-Danfoss manual Fluid Manufacturers,Technical Information.
DKMH.PS.330.C1.02 520L0534