Komatsu ecot3 PC300LC-8 Shop Manual page 234

SEN01995-01
2) When travel is stopped (low-pressure set-
ting)
q When the travel lever is placed in neutral, the
pressure in chamber (PA) drops and spool (24)
returns to the neutral position.
q When spool (24) is in the process of returning
to the neutral position, the pressurized oil in
chamber (J) flows to chamber (PA) via pas-
sage (H) and chamber (G).
q Piston (3) moves to the left side, decreasing
the set load.
q The safety valve is caused to the low pressure
setting, thereby attenuating the shocks when
the speed is reduced.
Set pressure of safety valve
High pressure setting:
40.2 MPa {410 kg/cm
(at start of travel and during travel)
Low pressure setting:
27.5 MPa {280 kg/cm
42
2
}
2
} (during stop)
10 Structure, function and maintenance standard
PC300, 350-8