System Design
Motor hydraulic circuit
Simple connection
Figure 24. A simple motor hydraulic circuit in an open loop hydraulic system.
In an open loop hydraulic system the hydraulic circuit of the motor is usually
implemented roughly as in the figure above.
• Select the operating direction with the directional control valve (1) by applying the
working pressure (P) to the other working line (A or B).
• The minimum pressure (see
Working line pressure
on page 32) required in the
return line (T) is created with the cracking pressure of the check valve (2).
• The case drain line port (C) is connected to the system reservoir (T0) as directly as
possible.
Attention:
The case drain line of the motor must always be connected to a reservoir,
even during freewheeling. The case pressure of the motor may rise
significantly, if the motor is completely plugged during use.
Note:
Using the motor on a closed loop hydraulic system is different from the
open loop system. The closed loop system is more complex, but enables
more functions, such as hydrostatic braking, series connection and
counter pressure operation.
Motors in parallel or series circuit
The traction of a vehicle may be increased by connecting multiple motors in parallel
or in series.
A single powered wheel may transmit only a certain amount of power to traction. By
dividing the power to multiple wheels, the vehicle gets more traction. This is
advantageous especially in slippery operating conditions.
4
4.1
4.1.1
4.1.2
System Design
26
Product Manual
