TIGIEFFE AIRO A Series, Use And Maintenance Manual

Page: 74 / 130

Use and Maintenance Manual – A16 J A18 J Series Page 74
7.2.8. Drive circuit pressure relief valve adjustment and operation check
The described pressure relief valve controls the maximum
pressure of the hydraulic drive circuit. 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 main pressure relief valve (see
figure aside):
▪
Disconnect the power cords of the solenoid valves
EV2 and EV3 (H and I ).
▪ Introduce a pressure gauge with full scale of at least
250 bar in the special quick coupling (1/4” BSP) D;
▪ Using the platform control panel drive the machine
forward and backward. Initially carry out the
operation softly to check that the above mentioned
solenoid valves have been disconnected properly
(the machine should not move).
▪
Check the detected pressure value. The correct
value is indicated in the chapter “ Technical
features " .
Fig. 26
To adjust the pressure relief valve:
▪
Disconnect the power cords of the solenoid valves EV2 and EV3 (H and I ).
▪ 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 A.
▪
Unscrew the adjusting dowel lock-nut;
▪ Using the platform control panel, drive the machine forward and backward and adjust the pressure relief valve by
means of the adjusting dowel so as to reach the pressure value indicated in chapter " Technical Features ". Initially
carry out the operation softly to check that the above mentioned valves have been disconnected properly (the
machine should not move).
▪
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.