F42W624A
Hydraulic oil delivered from the secondary gear
pump is sent to the PST valve through the port P.
When the steering wheel is stopped, only the neutral
holes of the spool and sleeve of the PST valve are
aligned, so hydraulic oil at the port P is returned
through the port T and is supplied to the PTO valve
side.
When the steering wheel is turned counterclockwise,
the sleeve is turned counterclockwise approx. 10
degrees behind the spool, so the oil holes of the
spool and sleeve for the left turn operation are
aligned. Therefore, hydraulic oil at the port P is
passed through the spool, sleeve and Gerotor and is
supplied to the right port of the PST cylinder through
the port L. On the other hand, hydraulic oil at the left
portofthePSTcylinderisowedthroughtheportR,
returned through the return holes of the spool and
sleeve for left turn and port T, and delivered to the
PTO valve. Therefore, the PTO valve receives the
same amount of hydraulic oil whether the steering
wheel is turned or not.
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