Komatsu Galeo PC800-8 Shop Manual page 271

10 Structure, function and maintenance standard
7. Travel speed selection function
This is an automatic gear shift function in which the
travel pressure (self pressure) switches the swash
plate angle of the travel motor.
• If the machine is traveling at high speed with the
travel speed switch at Hi and the load increases,
such as when traveling up a steep hill, if the trav-
el pressure goes above 22.6 MPa {230 kg/cm
the self pressure switches to low speed.
The machine continues to travel at low speed
and when it comes to flat ground and the load is
reduced, if the travel pressure goes below 22.6
MPa {230 kg/cm }, the travel speed is automati-
2
cally switched to high speed.
Travel speed Travel speed
switch solenoid valve
Lo De-energized
Hi
PC800, 850-8
Travel motor
swash plate angle
Max.
Max.
Energized
Min
},
2
Travel speed
Low speed
(max 2.8 km/h)
Low speed (2.8 km/h)
High speed (4.2 km/h)
SEN00386-03
Remarks
Suitable for traveling downhill
or on rough ground
Suitable for use when moving
long distances
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