Branson F36r - Page 292

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CHAPTER 6 HYDRAULIC SYSTEM 3015R(h)/3515R(h)/4015R(h)/F36R(h)/F42R(h) TRACTOR
RIGHT TURN OPENING RELIEF VALVE
FFUHY
FFUHY
3
/ 5
7
PST VALVE
PTO VALVE
F42W625A
FFUHY
FFUHY
3
/ 5
7
PST VALVE
PTO VALVE
F42W626A
When the steering wheel is turned clockwise, the
sleeve is turned clockwise approx. 10 degrees
behind the spool, so the oil holes of the spool and
sleeve for the right turn operation are aligned.
Therefore, hydraulic oil at the por t P is passed
through the spool, sleeve and Gerotor and is
supplied to the left port of the PST cylinder through
the port R. On the other hand, hydraulic oil at the
right portof the PSTcylinderisowedthrough the
port L, returned through the return holes of the spool
and sleeve for right turn and port T, and delivered to
the PTO valve.
When the PST cylinder is moved to the left or right
end and there is no more space to move further,
pressure of hydraulic oil flowed through the port
P increases over the relief valve setting pressure,
130~137 kgf/cm
2
, resulting in opening of the relief
valve. Then,hydraulicoilowedthroughtheportP
is passed through the relief valve, returned through
the port T, and delivered to the PTO valve.