SEN06127-00
30-101
50 PC200, 200LC, 220, 220LC-8M0
101 Testing and adjusting, Part 1
Testing PPC valve output pressure
a Measuring tools for PPC valve output pressure
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
“Releasing remaining pressure from
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/
cm
2
}.
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.
a If the output pressure is as follows, the
PPC valve is normal.
6. After finishing measurement, remove the mea-
suring tools and return the removed parts.
Symbol Part No. Part name
P
1
799-101-5002 Hydraulic tester
790-261-1204 Digital hydraulic tester
2 799-401-3100 Adapter (Size 02)
3 799-401-3200 Adapter (Size 03)
Operation of lever Output pressure
Neutral 0 MPa {0 kg/cm
2
}
Stroke end
Almost same as control
circuit basic pressure (See
standard values table)
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