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42hW-201601
CHAPTER 6 HYDRAULIC SYSTEM
6
3015R(h)/3515R(h)/4015R(h)/F36R(h)/F42R(h) TRACTOR
4.8.2 SAFETY VALVE
(1) Safety valve ass’y
(2) Nut
(3) Bolt
(4) O-ring
(5) Body, safety valve
(6) O-ring
(7) Spring
(8) Ball guide
(9) Steel ball
(10) O-ring
The piston of the hydraulic cylinder case is supplied
with hydraulic oil through the lift solenoid valve of
the control valve. If the lift arm is overloaded by this
oil, pressure in the circuit rises continuously.
In other words, if impact pressure is applied from an
external source to an implement and this pressure
is over a certain limit, the safety valve is opened
to drain oil back to the tank in order to protect the
internal circuit of the hydraulic implement.
RELIEF VALVE
SETTING PRESSURE
210 ± 10 kgf/cm
2
K25W641A
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