Motor life depends on average speed and pressure. The higher the pressure, the
shorter the expected life. For Lh10 calculations, please consult the manufacturer.
MINIMUM PRESSURE
The minimum pressure is a low pressure required in the working lines, which ensures
the motor stays engaged when running. The motor is engaged when the pistons of
the motor stay constantly connected to the cam ring. The minimum pressure
guarantees continuous contact between cam rollers and cam ring.
The minimum pressure is maintained with charge pressure. Type of the hydraulic
system affects the implementation.
• CHARGE PRESSURE
In closed loop hydraulic system the charge pressure is usually used as the
minimum pressure.
In open loop hydraulic system the charge pressure may be done by a suitable
pressure reducing valve.
Attention:
Too low pressure in the working lines causes the pistons to disconnect
from the cam ring when the motor is running. The effect of this is
clattering noise when the pistons reconnect.
Constant use with too low working line pressure may cause premature
wear or failure of the motor.
Note:
Minimum work line pressure values are given at zero case pressure. To
calculate system specific minimum pressure, add case pressure to the
minimum pressure value from the chart.
The required minimum pressure depends on the rotational speed and case pressure.
Recommended values for the minimum pressure at zero case pressure are on the
following figures:
System Design
Product Manual
43
