Cub Cadet 8454 Service Manual page 209

(1) Control Spool
(2) Regulator Piston
(4) Exhaust Valve
(8) Regulator
(15) Chamber
(16) Exhaust Hole
c. Discharge Phase
During this phases the control valve supplies at the
same time the oil coming from the pump and the oil
contained in the cylinder to the discharge causing the
lowering of the arms.
The control spool (1) is in such a position to connect
chamber (15) directly to the discharge through hole (16).
The oil coming from the pump, as in the neutral phase,
is able to move downward the small regulator piston (2)
and to flow to the discharge through holes (17).
D569-W02 May-2003
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(17) Hole
(18) Annular Duct
(23) Cylinder Chamber
(24) Hole
(25) Hole
At the same time the oil contained in the cylinder cham-
ber (23) flows from annular duct (18) to the lowering
regulator (8) and through hole (24) it enters the dis-
charge valve (4), flowing to the discharge from the hole
(25) therefore causing the lowering of arms.
In this phases the lowering speed of the implement is
controlled automatically by the lowering regulator (8)
that is sensible to the dynamic force of the discharge
oil, consequently modifying the throat that keeping con-
stant, into acceptable limits, the lowering speed even
if the cylinder pressure varies.
HYDRAULIC SYSTEM
569W612A
6-15