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101 Testing and adjusting, Part 1
Testing and adjusting oil pressure in pump LS control cir-
2)
Install nipples M3 and connect it to differ-
ential pressure gauge M2 or the oil pres-
sure gauge of hydraulic tester M1.
a When using differential pressure gauge
M2:
Connect the pump discharge pres-
sure to the high pressure side (back
side) and connect the LS pressure to
the low pressure side (lower side).
Since the differential pressure gauge
needs a 12V power source, connect it
to a battery.
a When using oil pressure gauge (in M1):
Use the oil pressure gauge of 60 MPa
{600 kg/cm
MPa {10 kg/cm
tial pressure is approximately 4.0
MPa {40 kg/cm
sure it by installing the same gauge to
the pickup plugs alternately.
The figure shows the pump discharge
q
pressure side.
q
The figure shows the LS pressure side.
PC200, 200LC, 220, 220LC-8M0
2
} having the unit of 1.0
2
}. Since the differen-
2
} at maximum, mea-
3)
Run the engine, push up the track shoe on
the side to be measured with the work
equipment, and prepare for running track
shoe idle.
q
When measuring front circuit: Right
track shoe
When measuring rear circuit: Left
q
track shoe
k
Since the raised track shoe will be
run idle during measurement,
secure a sufficient working area.
4)
Set the working mode in the power mode
(P) and set the travel speed in the High
position.
5)
Run the engine at high idle, set all the
levers and pedals for work equipment con-
trol, swing control, and travel in neutral,
and measure the oil pressure at each
speed. Then, operate the travel lever to
run the track shoe idle and measure the oil
pressure.
k
While taking extreme care for
safety, run the raised track shoe.
a Do not operate the travel lever to its
stroke end (but stop it halfway).
a Measuring condition and method of
judgment: If the pressures are in the
following value, the LS valve is nor-
mal.
Operation of levers
All control levers and pedals
in neutral
Travel lever moved halfway
(Track running in the air)
6)
After finishing measurement, remove the
measuring tools and return the removed
parts.
SEN06127-00
LS differential
pressure
Specified LS dif-
ferential pressure
(See standard
values table)
43
30-101
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