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30 Testing and adjusting
Hydraulic system
Testing PPC valve outlet pressure
Connecting points of PPC piping
Circuit to be
No.
measured
Service 1B (white/
1
orange)
3 Bucket CURL (blue)
5 Arm IN (green)
Boom LOWER
7
(black)
Boom right SWING
9
(white/red)
Right travel
FORWARD (black/
11
yellow)
Left travel
FORWARD (brown/
13
yellow)
15 Left swing (white)
Blade LOWER (red/
17
black)
a The above figure shows the connecting points of
PPC piping to the control valve of 1-attachment
specification.
The colors in (
) are the colors of the bands
installed for piping identification.
a Testing tools
Sym-
Part No.
bol
799-101-5002 Hydraulic tester
1
790-261-1204 Digital hydraulic tester
R
799-401-3100 Adapter (size: 02)
2
Place the machine on a level ground, lower
the work equipment to the ground, and
release the remaining pressure in the
hydraulic circuit. For details, see "Releasing
remaining pressure in hydraulic circuit".
a Before testing PPC valve output pressure, check
that the control circuit source pressure is normal.
30-56
Circuit to be
No.
measured
Service 1A (white/
2
brown)
4 Bucket DUMP (red)
6 Arm OUT (orange)
Boom RAISE
8
(yellow)
Boom left SWING
10
(white/black)
Right travel
REVERSE (yellow/
12
green)
Left travel
REVERSE (yellow/
14
orange)
16 Right swing (brown)
Blade RAISE
18
(yellow/blue)
Part name
(PC88MR-PW11-360-K-00-A)
a Check this item under the following conditions.
Hydraulic oil temperature: 45 to 55°C
Testing
(PC88MR-PW11-362-K-00-A)
1. Disconnect the hose of PPC circuit to be tested.
a For the hose to be disconnected, see
"Connecting points of PPC piping".
2. Install adapter R2 and connect the disconnected
hose again.
3. Install nipple [1] of hydraulic tester R1 and
connect them to oil pressure gauge [2].
a Use the oil pressure gauge of 5.9 MPa {60
kg/cm
2
}.
a The figure shows the testing tools installed to
hose of the bucket CURL PPC circuit.
4. Start the engine, and set the working mode to
power mode (P).
5. Run the engine at high idle, set the control
levers in NEUTRAL and travel end, and
measure the oil pressure at each position.
a For standard values, see "Standard value
table for machine".
6. After finishing the test, remove the testing tools,
and restore the machine.
PC88MR-10
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