Komatsu PC200-8M0 Shop Manual page 391

101 Testing and adjusting, Part 1
Testing and adjusting oil pressure in pump PC control cir-
5) Run the engine at high idle, operate the
left work equipment control lever to relieve
the arm circuit at the IN stroke end, and
measure the oil pressure.
a Measuring condition and method of
judgment: If the pressures are in the
following ratio, the PC valve is nor-
mal.
Tested oil
pressure
Pump discharge
pressure
PC valve output
pressure
a If the PC valve or the servo piston is
abnormal, the PC valve output pres-
sure (servo piston inlet pressure) is
"the same as the pump discharge
pressure" or "almost 0".
6) After finishing measurement, remove the
measuring tools and return the removed
parts.
2. Measuring PC-EPC valve output pressure
1) Open the side cover of the pump room
and remove oil pressure pickup plugs (5)
and (6).
(5): Front PC-EPC valve output pressure
pickup plug
(6): Rear PC-EPC valve output pressure
pickup plug
PC200, 200LC, 220, 220LC-8M0
Operation of Ratio of oil
lever pressures
1
Arm IN relief
Approx. 0.6
(Approx. 3/5)
2) Install nipples L2 and connect them to oil
pressure gauges [2].
a Use the oil pressure gauge of 6 MPa
2
{60 kg/cm }.
3) Start the engine and set the working mode
in the power mode (P).
4) Run the engine at high idle and low idle,
set all the levers and pedals for work
equipment control, swing control, and
travel in neutral, and measure the oil pres-
sure at each speed.
SEN06127-00
39
30-101