10 - 2
Drive Motor Operation
From machine no. 751818, a different type motor is fitted
which has a flushing circuit. This is used to cool the motors
during operation.
To save efficiency losses the flushing is taken off through an
orifice on the low pressure side of the motor circuit.
Although the motors operate in both forward and reverse
they are expected to operate in the forward direction for
90% of the time so the flushing is taken off the return line
(port B when in forward). This is the normal flushing rate.
When the motors are in reverse mode there is higher
pressure in the B port and also through the orifice, so the
flow rate is higher in this mode.
It is important, when checking the flushing circuit flow, to
take the measurement in forward drive only.
Section E Hydraulics
9803/8550
Section E
10 - 2
Issue 1
Descriptions
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