Shop Manual

20-44
Quick Return Valve and Regulator Valve
General:
 The purpose of quick return valve is to make the regulator valve smoothly increase the
pressure of clutch. Quickly reset to transmit the pressure inside the accumulator to apply
into the pressure regulator valve. When the gearbox switches the shift, the loop will be
drained instantaneously.
The regulator valve is mainly composed of pressure regulator valve and accumulator.
When shift operation changes the speed, the clutch is compacted by the piston. If the oil
pressure is suddenly increased, the piston makes the clutch engaged abruptly and wheel is
started suddenly, which adds extra impact and the installation of quick return valve and
regulator valve avoid such situation. When the manipulator shift changes the speed, the
pressure on the piston is increased gradually until reach the setting pressure. When starting,
the purpose of such device is to make the clutch engage smoothly and avoid impact, which
not only increase the durability of gearbox, but also make the operator more comfortable.