Komatsu PC200-8M0 Shop Manual page 189

402 Hydraulic system, Part 2
Functions and operation by valve
Safety valve for hydraulic drift prevention valve
Operation when abnormally high pressure is generated
q If abnormally high pressure is generated in the boom cylinder bottom circuit, the pressurized oil in port
(B) opens check valve (1a) to actuate safety valve for hydraulic drift prevention valve (2).
The pressurized oil of the boom cylinder bottom circuit pressure or arm cylinder head circuit pressure,
q
whichever has higher pressure, opens check valve (1a) or (1b) to actuate safety valve for hydraulic drift
prevention valve (2).
PC200, 200LC, 220, 220LC-8M0
SEN06120-00
47
10-402