TIGIEFFE AIRO A Series, Use And Maintenance Manual

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Use and Maintenance Manual – A16 J A18 J Series Page 75
7.2.9. Circuit movements pressure relief valve operation check
The main pressure relief valve controls the maximum
pressure of the circuit movements. (lifting
operations/lowering/rotation). 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 bar in the special quick coupling (1/4” BSP) D;
▪ Using the ground control panel, lift the machine up
to the end stop.
▪ Check the detected pressure value. The correct
value is indicated in the chapter “ Technical
features " .
Fig. 27
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 pressure relief valve of lifting circuit 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.
WARNING!
AS THIS OPERATION IS VERY IMPORTANT IT IS TO BE CARRIED OUT BY SKILLED TECHNICIANS
ONLY.