5-9
5
TRAVELING
TROUBLESHOOTING
3. Check the spool operation
Disconnect the hose connecting the control valve (trav-
el
block) and the swivel joint from the control valve. Fit
the pressure gauge to the discharge port on the con-
tr
ol valve.
• Operate the lever (travel) and measure the pres-
sur
e.
• If the measured value is as below, the spool is nor-
mal.
Supply pressure: 21.0 MPa
4. Check the swivel joint
• Disconnect the hose connecting the swivel joint and
the counter balance valve from the counter balance
valve. Fit the pressure gauge to the hose just dis-
connected.
• If the measured value is within specifications, the
swivel joint is normal.
“2. Service data, Performance criteria”
5. Check the counter balance valve
• If neither forward nor reverse travel is possible, the
spool (1) of the counter balance valve could be
sticking in the neutral position.
• If either forward or reverse travel is possible, the
spool (1) of the counter balance valve could be stick-
ing in a position other than the neutral position.
• Remove the counter balance valve plug (2) and push
the spool (1) with a finger. If it moves smoothly about
6 mm, the counter balance valve is normal.
6. Check the travel motor
“4. Disassembly and assembly, Travel motor”
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