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BUCKET
TROUBLESHOOTING
4. Test by replacing the port relief valve
Replace the port relief valve in question with a port re-
lief
valve used for a normal boom. If the bucket cylinder
operates normally with the replacement valve, the port
relief valve used on the bucket side is faulty.
5. Check the bucket cylinder
Switch between the arm hose and the bucket hose
connected to the piping at the boom foot.
• Move the lever (arm) to operate the bucket cylinder.
• If the cylinder fails to operate, it is faulty.
Before performing the steps above, fully extend the
bucket cylinder, completely retract the arm cylinder
and lower the bucket to the ground.
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