5-22
5
SLEWING
TROUBLESHOOTING
3. Check the spool operation
Check if the spool of the control valve (slew block) re-
tur
ns to the neutral position when the operation lever
(slew) is released after operation. Disconnect the hose
connecting the control valve (slew block) and the slew
motor from the control valve. Fit the pressure gauge to
the discharge port on the control valve.
• Operate the lever (slew) and then release it to read
the pressure gauge.
• If the pressure is zero, the spool is normal.
4. Check the check valve of the slew brake valve
“5-18”
5. Check the slew pressure
“5-16”
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