7.3.6 Lifting circuit pressure relief valve operation check
The self-propelled aerial platforms, X-XS series, have a pressure relief valve on the lifting circuit to avoid dangerous overpressure
values. Normally, this valve does not require any adjustment, since it is calibrated at the factory before the machine is delivered.
The system needs calibration:
▪ in case of replacement of the hydraulic block
▪ in case of replacement of the pressure relief valve only.
To check the pressure relief valve on the lifting circuit (figure 7-8):
▪ 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 pressure value. The correct value is indicated in the chapter “Technical features".
Check operation at least once a year.
To calibrate the pressure relief valve on the lifting circuit (figure 7-8):
▪ 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.
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