Testing And Adjusting Oil Pressure In Pump Ls Control Circuit - Komatsu PC200-8M0 Shop Manual

101 Testing and adjusting, Part 1
Testing and adjusting oil pressure in pump LS control cir-
Testing and adjusting oil pressure
in pump LS control circuit
a Measuring and adjusting tools for oil pressure
in pump LS control circuit
Symbol Part No.
799-101-5002 Hydraulic tester
1
790-261-1204 Digital hydraulic tester
M 2 799-401-2701 Differential pressure gauge
799-101-5220 Nipple (10 × 1.25 mm)
3
07002-11023
k
Stop the machine on a level ground and
lower the work equipment to the ground.
Then, release the residual pressure from
the hydraulic circuit. For details, see
"Releasing residual pressure from hydrau-
lic circuit".
Measuring
a Before measuring the oil pressure in the pump
LS control circuit, check that the oil pressure in
the work equipment, swing, and travel circuits
and the control circuit source pressure are nor-
mal.
a Measure the oil pressure in the pump LS con-
trol circuit under the following condition.
q Hydraulic oil temperature: Within operating
range
1. Measurement of LS valve output pressure
(servo piston inlet pressure)
a Measure the LS valve output pressure
(servo piston inlet pressure) and pump
discharge pressure simultaneously to
compare them.
1) Open the side cover of the pump room
and remove oil pressure pickup plugs (1),
(2), (3), and (4).
q (1): Front pump discharge pressure
pickup plug
q (2): Rear pump discharge pressure
pickup plug
q (3): Front LS valve output pressure
pickup plug
q (4): Rear LS valve output pressure
pickup plug
PC200, 200LC, 220, 220LC-8M0
Part name
O-ring
1
2) Install nipples M3 and nipples [1] of
hydraulic tester M1 and connect them to
oil pressure gauges [2].
a Connect the measuring part of plug
(3) by using joint (790-301-1271) and
elbow (790-301-1530) of hydraulic
tester M1 and nipple [1] so that it will
not interfere with the drain piping.
a Use the oil pressure gauge of 60 MPa
{600 kg/cm
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
When measuring rear circuit: Left
q
track shoe
k
Since the raised track will be run in
the air 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.
SEN06127-00
2
}.
30-101
41