Cub Cadet 8454, Service Manual

Page: 237 / 334

HYDRAULIC SYSTEM
6-43
D569-W03 June-2003
• In case PTO clutch switch is ON
Oil at Port PI comes back to Port P of the solenoid valve
through the valve inside returns as forced from Port B
to the valve. Right after the PTO clutch switch is turned
ON, the oil from Port B of the valve returns from Ports
T2 and A by moving the spool to the right with the oil
applied to the spool.
And the oil via the around of the spool is not only ap-
plied from Port C to the piston of the PTO hydraulic
clutch but also returned to the check valve as forced
owing to the low pressure.
Oil in amount constantly regulated at the orifice of the
check valve through the filter compresses the inner
spring of the piston by moving the piston to the left
slowly.
Thus, open and reinstated passage by pressing the
spool is not returning back from Port B if not high pres-
surized. The pressure at Port C as high-pressurized
proportionately is returning from Ports T2 and A while
kept at a constantly high pressure of 16 ~ 18 kgf/cm². Since
the orifice moves the piston with a constant oil amount,
PTO is slowly connected. This is called the modulating
time as of approx. 0.8 second.
569W655B
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