Testing Ppc Valve Output Pressure - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02625-06
Testing PPC valve output pres-
sure
a PPC valve output pressure measurement tools
Symbol Part No.
799-101-5002 Hydraulic tester
P
790-261-1204 Digital hydraulic tester
a Measure PPC valve output pressure after con-
firming that control circuit original pressure is
normal.
1. Remove PPC hydraulic switches (1) to (10) of
the target circuit of measurement.
Circuit to be mea-
No
sured
1 Boom RAISE
2 Boom LOWER
3 Arm IN
4 Arm OUT
5 Bucket CURL
a (1) through (8) are installed in the PPC relay
block, and (9) and (10) are installed in the
back side of operator cab.
52
Part name
Circuit to be mea-
No
sured
6 Bucket DUMP
7 Swing right
8 Swing left
9 Travel (black)
10 Steering (red)
2. Fit nipple [1] of the hydraulic tester P and then
connect it to oil pressure gauge [2].
a Use the oil pressure gauge with capacity 6.0
2
MPa {60 kg/cm
3. Start the engine and keep it running until the
hydraulic oil temperature rises to the operating
range.
4. Measure the pressure when the engine is
running at high idle and the control lever of the
circuit to be measured is kept in the NEUTRAL
position and at the full stroke.
a If PPC valve output pressure is at the level
shown below, it is judged normal.
Lever operation
When set to NEU-
TRAL
At full stroke
5. Remove the measurement tools after the
measurement, and make sure that the machine
is back to normal condition.
30 Testing and adjusting
}.
Hydraulic oil pressure
2
0 MPa {0 kg/cm
Almost the same with the
control circuit source
pressure (refer to the
standard value table)
PC300, 350-8
}