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SYSTEMS OPERATION
5.
Inching action.
The inching valve regulates the directional clutch
pressure for driving
the
machine in an inching
manner or extremely slowly.
Inching valve
plunger 1 is connected to the inching pedal (left
pedal) through rod.
As long as the inching pedal is in released posi
tion, plunger 1 is kept pushed to the left end of its
stroke by return spring 2. Under this condition,
primary
pressure in passage 3 is adiñftted into
secondary pressure passage 4, thus maintaining
21 kgf/cm2 (299 psi) [2 MPa] pressure there.
I
Plunger
2 Return spring
3
Primary pressure passage
(from differential valve)
4 Secondary pressure passage
(to directional selector valve)
5
Valve
6 Inching spring
7 Retum.spring
8
Oil
passage
28
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