Allied H12E, Service Manual

Page: 45 / 121

Section 1
1 - 37
Sequence of Operation - LINE-OUT HI-SPEED (K64)
LINE-OUT operation is similar to LINE-IN except moving
the control lever away from the operator reverses fl ow
at the tractor ripper valve and directs fl ow through the
counterbalance relief manifold to the motor “B” port and to
the RO port on the control manifold, and returns through
“A” port. Brake release operates the same as
LINE-IN
mode.
In LINE-OUT operation, oil fl owing from motor port “A”
to the counterbalance relief manifold is controlled by the
counterbalance valve. The counterbalance valve maintains
suffi cient pressure in the motor outlet (A) line to prevent
uncontrolled lowering of a load.
If HI-SPEED is selected by the operator, pilot pressure is
sent to the X1 motor port to control motor displacement.