Takeuchi TB175W, Руководство по ремонту

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TROUBLESHOOTINTG
BOOM
V-21
TB175W
2. Inspect the pilot valve.
Disconnect the hose between the pilot valve and
control valve (boom section) on the control valve
side, then set a pressure gauge in the disconnected
hose.
• Operate the (boom) lever and measure the
pressure.
• Depending the operation angle, if the pressure
is normal, it will range between 0~3.4 MPa.
3. Inspect the operation of the spool.
Disconnect the hose between the control valve
(boom section) and the cylinder on the cylinder
side, then set a pressure gauge in the disconnected
hose.
• Operate the (boom) lever and measure the
pressure.
• A pressure of 27.5 MPa is normal.
4. Perform a port relief valve switching test.
Switch the port relief valve for the port relief
valve of the normal arm. If the boom cylinder
operates, the boom side port relief valve is faulty.
5. Inspect the boom cylinder.
a. Disconnect the hose between the control valve
and the boom cylinder on the control valve
side.
b. Connect the disconnected hose to the arm
section or the bucket section.
c. Try operating the boom cylinder. If the cylin-
der doesn’t operate, the cylinder is faulty.
When performing the operation in “a~c”
above, the bucket cylinder should be fully
extended, the arm cylinder should be fully
retracted and the bucket should be lowered
to the ground.
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W2E005
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