Komatsu PC500LC-10R Shop Manual page 292

MACHINE PUSH-UP SYSTEM
17: Front pump
17a: Servo
17b: LS valve
17c: PC valve
18: Rear pump
18a: Servo
18b: LS valve
18c: PC valve
19: Control valve
19a: Self-pressure reducing valve
FUNCTION OF MACHINE PUSH-UP SYSTEM
• The push force of the boom is increased by operating ma-
chine push-up switch (1).
• This function is used to increase the push force of the
boom for ditching or excavating hard ground.
Function
OFF
ON
10-198
Setting
Boom cylinder head
Safety valve set pressure
2
14.7 MPa {150 kg/cm }
Boom cylinder head
Safety valve set pressure
2
28.4 MPa {290 kg/cm }
10 STRUCTURE AND FUNCTION
19b: Merge-divider valve
19c: Travel junction valve
19d: Main relief valve
20: Front pump PC-EPC valve
21: Rear pump PC-EPC valve
22: Machine push-up solenoid valve
23: Suction safety valve
24: Boom valve
25: Boom cylinder
PC500LC-10R