Komatsu PC210-8, Shop Manual

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30 Testing and adjusting UEN00228-04
PC210, 230, 240-8
37
3) Start the engine and push up the track
shoe on the side to be measured with the
work equipment and prepare for running
the track shoe idle.
q
When measuring front circuit: Right
track shoe
q
When measuring rear circuit: Left
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 checking the safety around
the machine extremely, run the
track shoe pushed up idle.
a
Do not operate the travel lever to the
stroke end (but stop it halfway).
a
Measuring condition and method of
judgment: If the pressures are in the
following ratio, the LS valve is normal.
6) After finishing measurement, remove the
measuring tools and return the removed
parts.
2. Measuring LS differential pressure
a
Measure the pump discharge pressure
and LS pressure (actuator load pressure)
simultaneously and calculate the differ-
ence between them.
1) Open the side cover of the pump room
and remove oil pressure pickup plugs (1),
(2), (5), and (6).
q
(1): Front pump discharge pressure
pickup plug
q
(2): Rear pump discharge pressure
pickup plug
PC240-8
Measured oil
pressure
Operation of lever and ratio
of oil pressures
All control
levers and
pedals in neu-
tral
Travel lever
moved half-
way (Track
shoe run idle)
Pump discharge
pressure
Almost same
1
LS valve output
pressure
Approx. 0.6
(Approx. 3/5)
PC210/230-8
1
2
Warning:Test points reversed
on PC210/230-8 pump
PC240-8