TESTING AND ADJUSTING TVC VALVE OUTPUT
TESTING AND ADJUSTING
PRESSURE (SERVO PISTON INPUT PRESSURE)
TESTING AND ADJUSTING TVC
VALVE OUTPUT PRESSURE (SERVO
PISTON INPUT PRESSURE)
MEASURING
*
Hydraulic oil temperature when measuring : 45 - 55°C
l
Measure the oil pressure when the circuit is relieved
in the power max. mode.
1)
Remove pressuremeasurement plugs (l), (2), (3),
and (4) (Thread dia. =
10 mm, Pitch = 1.5 mm), and
install oil pressure gauge Cl.
*
Install a 39.2 MPa (400 kg/cm? gauge to the
servo valve end, and a 58.8 MPa (600 kg/cm?
gauge to the pump outlet port end.
2)
Set the swing lock switch ON.
3)
Set the working mode to H/O mode.
4)
Run the engine at high idling, turn the L.H. knob
switch ON, and measure the oil pressure when the
arm IN circuit is relieved.
* Check that the servo piston input pressure is %
of the pump discharge pressure.
[Reference]
If there is any abnormality in the LS valve or servo
piston, the servo piston input pressure will be almost
the same or 0 of the pump discharge pressure.
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