TESTING AND ADJUSTING
MEASURING PPC VALVE OUTPUT PRESSURE
AND TESTING PPC SHUTTLE VALVE
MEASURING PPC VALVE OUTPUT
PRESSURE AND TESTING PPC
SHUTTLE VALVE
*
Hydraulic oil temperature when measuring: 45 - 55°C
1.
Measuring PPC valve output pressure
1)
2)
3)
4)
Disconnect the hose of the circuit to be measured
(see next page).
Install adapter C3 between the hose and elbow.
Install oil pressure gauge CI (5.88 MPa (60
kg/cm?) to adapter C3.
Run the engine at high idling, operate the control
lever of the circuit to be measured, and measure
the oil pressure.
2.
Checking PPC shuttle valve
If the output pressure at the control valve end is low,
check for leakage of oil from the PPC shuttle valve as
follows.
1) Disconnect the hose between the PPC valve and
the shuttle block at the block end.
2) Install an adapter for measuring the oil pressure
to the tip of the hose, then install blind plugs to
the tip and shuttle block end.
3) Operate the control lever and measure the output
pressure.
j, If the output pressure becomes normal, there is
leakage from the PPC shuttle valve; if there is no
change, the PPC valve is defective.
3. Checking defective operation of PPC shuttle valve
1) Remove the oil pressure switch, fit adapter Cs,
then install oil pressure gauge CI (5.88 MPa (60
kg/cm?).
2) Operate the applicable lever.
If no oil pressure is generated or if oil pressure is
generated when another lever is operated, the
operation of the PPC shuttle valve is defective.
PPC hose
PPC
CS’
XlOAV282
20-51
a
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