be divided between fewer motors, when some of the motors are
disengaged.
Attention:
Any pressure in the working lines (A and B) during the freewheeling
pushes the pistons out of the freewheeling position. This causes clattering
noise when the pistons connect to the cam ring.
Constant clattering of the pistons may cause premature wear or failure of
the motor.
ROTATING SPEED
The rotating speed of the motor should be taken into account when implementing
freewheeling.
• FREEWHEELING SPEED
The freewheeling speed is the highest permissible rotating speed of the motor
during freewheeling.
• ENGAGING SPEED
The engaging speed is the highest permissible rotating speed when engaging the
motor.
The permissible freewheeling and engaging speeds can be found on the technical
data (see
Technical data
on page 10).
DISENGAGING DELAY
While the pistons are retracting, there is a momentary flow of hydraulic fluid from the
working lines to the casing of the motor. This causes always a small delay when
disengaging the motor. Normal delay is about 1 - 2 seconds.
To minimize the disengaging delay the hydraulic fluid should have as open channel as
possible:
• The external freewheeling valve should be positioned as close to the motor as
possible.
• All components and lines, which connect the working lines to the case drain line,
should be sized for highest feasible flow rate.
Attention:
Without freewheeling valve, the delay is considerably longer as the fluid
must seep through the motor. Disengaging the motor during motion
without a freewheeling valve may cause premature wear or failure of the
motor.
1-speed : 1N00
AAAA
-
BBBB
-
1N00
/
D
Displacement control selection 1-speed means the motor has a fixed displacement.
These motors are known as 1-speed motors and are always in full displacement
during operation.
3.7
Motor Description
20
Product Manual
