Komatsu PC500LC-10R, Shop Manual, Page: 121 / 758

FUNCTION OF TURBOCHARGER PROTECTION SYSTEM
This function prevents seizure of the turbocharger when the engine speed is increased suddenly after the en-
gine is started by limiting the engine speed.
Operating condition
→
Actuated
Engine oil pressure: Less than : 50 kPa
{0.51 kg/cm
2
}
Protection of turbocharger (see following figure)
A: Starting of engine
B: Turbocharger protection time (approximately 0 to 20 sec-
onds)
C: Modulation time (approximately 1 second)
D: : 500 rpm
E: : approximately 1000 rpm
F: : 1770 rpm (when working mode is P mode)
Fuel control dial: High idle (MAX) position, lever is in NEUTRAL
position
10 STRUCTURE AND FUNCTION TURBOCHARGER PROTECTION SYSTEM
PC500LC-10R 10-27