Measuring Ppc Valve Output Pressure; Testing And Adjusting, Part 3 - Komatsu Galeo PC800-8 Shop Manual

SEN00912-02

Testing and adjusting, Part 3

Measuring PPC valve output
pressure
a Devices for measuring PPC valve output pressure
Symbol Part Number
799-101-5002
1
790-261-1204
P
799-401-3200
2
02896-11009
a Measure the PPC valve output pressure under
the following conditions:
k Lower the work equipment to the ground and
• Hydraulic oil temperature: 45 – 55°C
stop the engine. Operate the control levers sev-
eral times to release the residual pressure in the
piping, and then loosen the oil filler cap of the
hydraulic tank slowly to release the internal
pressure of the hydraulic tank.
1. Remove the control valve top cover.
2. Disconnect hose (1) of the PPC circuit to be
measured. Install adapter P2 and connect the
hose again.
a For the hose to be disconnected, see the
connection diagram on the next page.
2
Part Name
Hydraulic tester
Digital hydraulic tester
Adapter (Size: 03)
O-ring
3. Install nipple [1] of hydraulic tester P1 and con-
nect it to oil pressure gauge [2].
a Use a pressure gauge of 6.0 MPa {60 kg/cm
a The figure shows the measuring instruments
installed to the right travel (reverse) circuit of
the left 5-spool control valve.
4. Run the engine at high idle, operate the control
lever of the PPC circuit to be measured, and
measure the oil pressure.
a Move the control lever to the stroke end.
a Condition of actuator to be measured
• When measuring the pressure for the
work equipment, move each cylinder to
the stroke end.
• When measuring the pressure for swing,
turn the swing lock switch ON.
• When measuring the pressure for travel,
put pin [3] between the sprocket and
track frame to lock the track shoe.
30 Testing and adjusting
}
2
PC800, 850-8