Komatsu PC500LC-10R Shop Manual page 352

COMPONENT PARTS OF TRAVEL SYSTEM
5.
The valve plate (5) and cylinder block (4) move to the direction of maximum tilt angle, motor capacity be-
comes the maximum, and machine travels at low speed.
During high-speed travel (motor swash plate angle is minimum)
1.
When the solenoid valve is energized, the pilot pressure oil flows from the self-pressure reducing valve to
the port (P).
2.
It pushes up the regulator valve (17).
3.
The pressurized oil in chamber (b) is drained into the case. The pressurized oil from control valve pushes
the check valve (21), flows to the end cover (6), and via regulator valve (17) to the chamber (a).
4.
An upward force is generated in regulator piston (9).
5.
The valve plate (5) and cylinder block (4) move to the direction of minimum tilt angle. The motor capacity
becomes the minimum and machine travels at high speed.
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10 STRUCTURE AND FUNCTION
PC500LC-10R
AEP20514