Testing Work Equipment Ppc Oil Pressure - Komatsu WA250-6 Shop Manual

SEN03837-01
Testing work equipment PPC oil
pressure
Necessary tools
Symbol Part No.
799-101-5002
Y
790-261-1204
T 793-463-1100
k
Loosen the oil filler cap slowly to release
the pressure inside the hydraulic tank.
Then operate the control levers several
times to release the pressure in the piping.
Measuring condition
Hydraulic oil temperature: 45 – 55°C
q
k
When leaving the operator's seat, apply the
work equipment lock lever securely.
Testing PPC valve basic pressure
1. Remove plug (4) (10 mm, P = 1.25 mm) for
measuring the work equipment EPC valve
basic pressure (same as low-pressure relief
pressure) from under the machine.
2. Fit a nipple, then install oil pressure gauge Y (6
MPa {60 kg/cm }).
2
3. Start the engine.
4. Run the engine at high idle, then operate the
work equipment control lever and measure the
oil pressure.
32
30-120
Part Name
Analog type hydraulic tester
Digital type hydraulic tester
Stopper

Testing work equipment PPC oil pressure

1
5. After finishing the work, remove the measuring
instruments and return the removed parts.
Checking PPC valve output pressure
1. Remove the inspection cover (1) of the front
frame.
k
Except for measuring the oil pressure,
when carrying out preparatory operations
with the lift arm raised, set support [1] or
lift arm drop prevention stopper T in posi-
tion before starting the operation.
2. Remove PPC output pressure measurement
plug of the circuit to be measured, then install
oil pressure gauge Y (6 MPa {60 kg/cm
3. Start the engine, then remove support [1] or
boom drop prevention stopper T.
120 Testing and adjusting, Part 2
2
WA250, 250PZ-6
}).