Komatsu PC200-8M0, Shop Manual

Page: 394 / 1254

SEN06127-00
30-101
42
PC200, 200LC, 220, 220LC-8M0
101 Testing and adjusting, Part 1
Testing and adjusting oil pressure in pump LS control cir-
5) Run the engine at high idle, set all the
levers and pedals for work equipment con-
trol, swing control, and travel control in
neutral, and measure the oil pressure.
Then, operate the travel lever to run the
track in the air and measure the oil pres-
sure.
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
Testing condition and judgment
method: When the hydraulic pres-
sures are within ratio in the table, LS
valve is normal.
6) After finishing measurement, remove the
measuring tools and return the removed
parts.
2. Measurement of LS differential pressure
a
Measure the pump discharge pressure
and LS pressure (actuator load pressure)
simultaneously and calculate the differ-
ence between them, to obtain the LS dif-
ferential pressure.
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
q (5): Front LS pressure pickup plug
q (6): Rear LS pressure pickup plug
Position of levers and pedals
All levers and
pedals are at
neutral
Travel lever
move half-
way (Travel
without load)
Hydraul
ic p
ressure
to
b
e
me
as
ure
d
Pump discharge
pressure
Almost same
pressure
1
(Actual value
is set as 1)
LS valve output
pressure
Approx. 3/5 of
pressure
above