Komatsu PC200-8M0, Shop Manual

Page: 387 / 1254

SEN06127-00
PC200, 200LC, 220, 220LC-8M0 30-101
35
101 Testing and adjusting, Part 1
Testing and adjusting oil pressure in work equipment,
3. Measuring unload pressure
1) Start the engine, set the working mode in
the power mode (P), and turn the auto-
decelerator OFF.
2) Run the engine at high idle, set all the
levers and pedals for work equipment con-
trol and travel in neutral, and test the oil
pressure.
a
The pressure measured when the
unload valve is unloaded is indicated.
4. Measuring work equipment relief pressure
1) Start the engine and move the cylinder to
be measured to the stroke end.
2) Set the working mode in the power mode
(P).
3) Run the engine at full speed, operate the
right and left work equipment control
levers to relieve the cylinder, and measure
the oil pressure.
a
The pressure measured when the
main relief valve is relieved is indi-
cated (If the boom is lowered singly,
the safety-suction valve of the control
v a l v e f o r l o w e r i n g t h e b o o m i s
relieved).
a
If the power maximizing switch is
released, the main relief valve is
relieved at low pressure. If the former
is pressed, the latter is relieved at
high pressure.
a
If the swing lock switch is set in
turned ON, the 2-stage relief solenoid
valve is kept turned ON and the relief
valve is relieved at high pressure.
Accordingly, keep the swing lock
switch turned OFF.
5. Measuring swing relief pressure
1) Start the engine, set the working mode in
the power mode (P), and turn the swing
lock switch ON.
2) Run the engine at high idle, operate the
left work equipment control lever to relieve
the swing motor, and measure the oil
pressure.
a
The pressure measured when the
swing motor relief valve is relieved is
indicated.
a
The swing relief pressure is lower
than the main relief pressure.
6. Measuring travel relief pressure
1) Run the engine and lock the travel mecha-
nism.
k Put pin [2] between the sprocket
and track frame to lock the travel
mechanism securely.
2) Set the working mode in the power mode
(P).
3) Run the engine at high idle, operate the
travel lever and pedal to relieve the travel
motor, and measure the oil pressure.
k Before operating the travel lever
and pedal, check the position and
locking direction of the locked
sprocket again.
a
The pressure measured when the main
relief valve of the control valve is
relieved is indicated. The travel circuit
is always relieved at high pressure.
7. Work after finishing measurement
After finishing measurement, remove the mea-
suring tools and return the removed parts.
3 Oil pressure pickup plug:
20 to 27 Nm {2.0 to 2.8 kgm}
Adjusting
a
The unload valve and suction safety valve for
lowering the boom cannot be adjusted.