Testing Ppc Valve Output Pressure - Komatsu PC200-8M0 Shop Manual

SEN06127-00
a Measuring tools for PPC valve output pressure
Symbol Part No.
799-101-5002 Hydraulic tester
1
790-261-1204 Digital hydraulic tester
P
2 799-401-3100 Adapter (Size 02)
3 799-401-3200 Adapter (Size 03)
k
Stop the machine on a level ground and
lower the work equipment to the ground.
Then, release the remaining pressure from
the hydraulic circuit. For details, see
" R e l e a s i n g r e m a i n i n g p r e s s u r e f r o m
hydraulic circuit".
a Before measuring the PPC valve output pres-
sure, check that the control circuit source pres-
sure is normal.
a Measure the solenoid valve output pressure
under the following condition.
q Hydraulic oil temperature: Within operating
range
1. Disconnect the hose of the PPC circuit to be
measured.
a For the hose to be disconnected, see
"Connecting points of PPC piping".
2. Install adapter P2 and connect the discon-
nected hoses again.
3. Install nipple [1] of hydraulic tester P1 and con-
nect it to oil pressure gauge [2].
a Use the oil pressure gauge of 6 MPa {60 kg/
2
cm }.
a The figure shows the measuring tools con-
nected to the hose of the bucket dump
PPC circuit.
4. Start the engine and set the working mode in
the power mode (P).
5. Run the engine at high idle and measure the
oil pressure with the control lever in neutral
and moved to its stroke end.
50
30-101
Part name
101 Testing and adjusting, Part 1

Testing PPC valve output pressure

a If the output pressure is as follows, the
PPC valve is normal.
Operation of lever
Neutral
Stroke end
6. After finishing measurement, remove the mea-
suring tools and return the removed parts.
PC200, 200LC, 220, 220LC-8M0
Output pressure
2
0 MPa {0 kg/cm }
Almost same as control
circuit basic pressure (See
standard values table)