Airo XP Series - Pressure Relief Valve Operation Check

Use and Maintenance Manual - XP - XLP Series
Page 47
7.3.5 Pressure relief valve operation check
The self-propelled platforms, XP-XLP series, have a main
relief pressure valve on the lifting circuit to avoid dangerous
overpressure values. Normally, this valve does not require any
adjustment, since it is calibrated in the factory before the
machine is delivered.
The system needs calibration:
 in case of replacement of the mini control unit
 in case of replacement of the pressure relief valve only.
To check the pressure relief valve on the lifting circuit:
 Introduce a pressure gauge with full scale of at least 200
bars in the special quick coupling A (1/4” BSP).
 Bringing the push-button station to the ground lift the
machine up to the end stop.
 Check the pressure value. The correct value is indicated in
the chapter “Technical features".
FIG.27
Check operation at least once a year.
To calibrate the pressure relief valve on the lifting circuit:
 Introduce a pressure gauge with full scale of at least 200 bars in the special quick coupling A (1/4” BSP).
 Locate the maximum pressure valve B and remove the cap C by unscrewing it;
 Bringing the push-button station to the ground lift the machine up to the end stop.
 Adjust the pressure relief valve by means of the adjusting screw D 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 C.
WARNING!
AS THIS OPERATION IS VERY IMPORTANT IT IS TO BE CARRIED OUT BY SPECIALIZED TECHNICIANS
ONLY.