Takeuchi TB53FR, Workshop Manual

Page: 288 / 447

TROUBLESHOOTING
SLEWING
V-22
TB53FR
2. Inspect the pilot valve.
Disconnect the hose between the pilot valve and
control valve (slew section) at the control valve
side, then set a pressure gauge in the disconnected
hose.
• A plug should be inserted in the control valve
port.
• Operate the lever (slew) and measure the pres-
sure.
• Depending on the operating angle, a pressure
in the 0~3.4 MPa range is normal.
3. Inspect the shuttle valve.
Disconnect the hose that goes between the shuttle
valve and the slew motor at the slew motor side
and set a pressure gauge to the disconnected hose.
• Operate the lever (slew) and measure the pres-
sure.
• The shuttle valve is normal if between 0 and
3.4 MPa corresponding to the operation angle.
4. Inspect the operation of the spool.
Disconnect the hose that goes between the control
valve (slew section) and the slew motor at the
valve side and set a pressure gauge to the dis-
charge port of the valve.
• Operate the lever (slew) and measure the pres-
sure.
• The operation of the spool is normal if it agrees
with the following value of supply pressure:
18.6 MPa
5. Inspect the slew hydraulic pressure.
Measure the pressure at the left and right slew
relief valves.
• The pressure is normal if it is the standard
value.
“II. Specifications, Standards for Judging
Performance”
If adjustment of the pressure is possible, the slew
relief valve’s adjustment is faulty. Also, if the
pressure adjustment is impossible, the slew relief
valve is faulty.