Airo X RT Series, Use And Maintenance Manual

Page: 67 / 118

Use and Maintenance Manual - X_RT Series Page 67
7.3.8 Lifting circuit pressure relief valve adjustment
The self-propelled aerial platforms, X_RT series have a pressure relief
valve on the lifting circuit
C
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.
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 pressure relief valve on the lifting circuit :
Introduce a pressure gauge with full scale of at least 300 bar in the
special quick coupling (1/4” BSP) marked
M1-3 .
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 on the lifting circuit:
Locate the pressure relief valve of the lifting circuit C .
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.
Fig. 28