Yanmar YM2000 - Work Under a Sudden Shock

6. Relief valve
b) Work under a sudden shock
Control lever
Operation of the relief valve when the lift arm is
Note:
subjected to a sudden shock,
To take advantage of the protection offered by the
Overload Pressure within the hydraulic device may
relief valve, always leave the stop valve open, as shown
be caused by a sudden shock applied to the lift arm,
in the diagram when driving the tractor with an
for example when driving over rough roads. When
implement mounted.
the pressure exceeds the allowable pressure, the
relief valve opens, to prevent damage to the pipes,
etc.
Hydraulic pressure outlet A
Shim, for pressure
Reservoir
Low pressu re flow
Fluid flow making the relief valve work