30 - 1
Introduction
The control valve is located on the mainframe to the rear of the boom mounting. Its function is to direct pressurised oil by
means of the operator’s controls to the rams and motors which supply power for the machine’s operation.
The valve is designed to perform the following functions:
a Controlling oil flow direction.
b Operating the hydraulic system smoothly, accurately and safely.
c Maintaining the hydraulic circuit pressure within specified ranges.
Integrated control valves operate a tandem circuit to provide maximum pressure when simultaneous operations are required.
Check valves are incorporated to provide load hold functions.
Technical Data
Rated flow 79.2 l/min (17.4 gal/min)
Maximum pressure for normal use 290 kgf/cm
2
(4125 lbf/in
2
)
Oil temperature range - 25 ~ 95 °C (-13 ~ 208 °F)
Weight 66 kg (146 lb)
Function Travel priority, slew priority, boom/dipper with load holding,
bucket, auxiliary
Section E Hydraulics
9803/6020
Section E
30 - 1
Issue 1
Control Valve
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