Allied H12E, Service Manual

Page: 27 / 121

Section 1
1 - 19
Sequence of Operation - LINE-OUT, Option Code B
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 “B” port, and returns
through “A” port. Brake release and motor speed control
(X1) operate the same as in
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.