TIGIEFFE AIRO R Series, Use And Maintenance Manual

Page: 71 / 114

Use and Maintenance Manual - R13 R17 Series Page 71
7.2.8. Pressure relief valve adjustment and operation check
The pressure relief valve described controls the maximum
pressure. Normally, this valve does not require any
adjustment, since it is calibrated at the factory before the
machine is delivered.
Calibration is required:

in case of replacement of the hydraulic block

In case of replacement of the pressure relief valve only
Check operation at least once a year.
To check the operation of the pressure relief valve:
 Introduce a pressure gauge with full scale of at least 250
bars in the special quick coupling (1/4” BSP).
 Using the ground control panel lift the machine up to the
end stop.
Check the pressure value. The correct value is indicated in
the chapter “Technical features" .
To calibrate the pressure relief valve:

Introduce a pressure gauge with full scale of at least 250
bar in the special quick coupling (1/4” BSP) D.

Locate the main pressure relief valve B.

Unscrew the adjusting dowel lock-nut.

Using the ground control panel lift the machine up to the
end stop.
 Adjust the pressure relief valve by means of the
adjusting dowel so as to reach the pressure value
indicated in chapter "Technical Features".
Once calibration has been carried out, lock the adjusting
dowel by means of the lock-nut.
Fig. 31
WARNING!
AS THIS OPERATION IS VERY IMPORTANT IT IS TO BE CARRIED OUT BY SKILLED TECHNICIANS ONLY.