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5
DOZER BLADE
TROUBLESHOOTING
4. Check the supply pressure of the control valve
Disconnect one of the hoses connected to the control
valve housing block (blade). Fit the pressure gauge to
the hose just disconnected. Operate the lever (blade)
and check the supply pressure of the valve.
• If the value indicated is not as below, the housing
block is faulty.
Supply pressure: 19.6 MPa
When only “Dozer Blade Lower” is impossible
• Replace the port relief valve in question with a port
relief valve used for a normal arm. If the dozer blade
cylinder operates normally with the replacement
valve, the port relief valve used on the dozer blade
side is faulty.
5. Check the swivel joint
Disconnect the hose connecting the swivel joint and
the blade cylinder from the blade cylinder. Fit a pres-
sur
e gauge to the hose just disconnected and operate
the lever (blade).
• If the value indicated is not as below, the swivel joint
is faulty.
Supply pressure: 19.6 MPa
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