V-11
TROUBLESHOOTINGMACHINE TRAVEL
1. Inspect the pilot valve.
Measure the secondary pressure of the pilot
valve.
a. Disconnect the hose connecting the HST
pump (P1, P2) and the pilot valve at the
pump.
b. Fit a pressure gauge to the hose.
c. Engage the travel lever and measure the pres
-
sure.
• The pilot valve is working properly if pres
-
sure varies from 0 to 3.1 MPa in accordance
with movement of the angle of the travel le
-
ver.
2. Inspect the charge pressure.
“II. Specifications, Standards for Judging
Performance”
3. Inspect the output pressure of the HST
pump.
“II. Specifications, Standards for Judging
Performance”
4. Perform replacement test for the high pres-
sure relief valves.
Since it is highly unlikely that all four high pres
-
sure relief valves to fail simultaneously, it is
possible to replace them one by one to test that
they are individually functioning.
• If the motor begins to run normally after a
valve has been replaced, then you may as
-
sume that the valve in place before the test
replacement is at fault.
5. HST pump fault.
“IV. Hydraulic Units, Hydraulic pump”
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