MACHINE CONFIGURATION
BUCKET
V-39 TB53FR
4. Perform a port relief valve switching test.
When only “bucket load” side is inoperable:
Replace the port relief valve with that of the
normal boom, and test. If the bucket cylinder
operates, the replaced old port relief valve was
faulty.
5. Inspect the bucket cylinder.
At the boom foot, exchange the arm hose with the
bucket hose that is connected to the pipe.
• Move the lever (arm) and check whether the
bucket cylinder operates.
• If the bucket cylinder does not operate, the
bucket cylinder is faulty.
This inspection should be done with the
bucket cylinder fully extended and the arm
cylinder fully retracted. Also, the bucket must
be lowered to the ground.
J1E018
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