6
-
15
42hw-201601
Chapter 6 hydrauliC system
6
3015r(h)/3515r(h)/4015r(h)/F36r(h)/F42r(h) traCtOr
maNual steeriNG (leFt turN)
FFUHY
FFUHY
3
/
5
7
PST VALVE
PTO VALVE
F42W627a
When the steering wheel is turned with the engine
stopped, the spool, sleeve and �erotor pump are
rotated as described previously. For example,
when the steering wheel is manually turned
counterclockwise, hydraulic oil at the left side of
the PST cylinder is sucked through the port R and
is flowed to the �erotor through the sleeve and
spool. Then, after hydraulic oil is pressurized in the
�erotor, it is flowed into the left side of the check
valve through the spool and sleeve and leaves the
right side of the valve. Finally, it passes through
the spool, sleeve and port L and flows into the right
port of the PST cylinder to complete the manual left
turn operation. For right turn, hydraulic oil is sucked
through the port L from the right port of the PST
cylinder and is flowed into the left port of the PST
cylinder through the port R to complete the manual
right turn operation.
Summary of Contents for 3015h
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