Takeuchi TB53FR, Workshop Manual

Page: 294 / 447

TROUBLESHOOTING
SLEWING
V-28
TB53FR
3. Inspect the operation of the spool.
Inspect if the spool of the control valve (slew
section) returns to the neutral position when the
operation lever (slew) is released after operation.
Disconnect the line from the slew section of the
control valve, then set a pressure gauge in its
supply port.
• Read the pressure gauge after operating the
lever (slew), then releasing it.
• If the pressure is zero, the pilot valve is normal.
4. Inspect the check valve of the slew brake
valve.
If the slew lever returns to the neutral position, the
upper frame may try to stop, but if some foreign
object is caught in the check valve, the return oil
ends up flowing to the supply side. For that
reason, the amount of overrun when slewing
stops is great during slew stopping.
5. Inspect the slew hydraulic pressure.
“V-22”