Operating manual No.
057-2-6-0005-R0
Version 2018
Page 27
EN
8.3
Piston replacement
In case the hydraulic piston must be replaced, proceed as follows:
1-
Lower the lifting platform to the minimum height position;
2-
Maintain the lowering control of the lift for another 6 seconds, to empty the oil;
3-
A second operator must lift the lifting platform by hand up to about 500 mm from the ground; the
fall protection device (once the lift has been brought to the minimum height) will be unhooked and
will be able to fit inside the nearest pawl;
4-
The piston is empty, so it can be disassembled by unscrewing the support screws, the pin (top) and
the oil tube (bottom):
Figure 10
–
hydraulic piston
5-
The piston is replaced by tightening the screws and pin and reconnecting it with the hydraulic circuit;
6-
Keep the ascent button pressed for as long as necessary for the piston to re-fill and start the
lifting operation;
7-
Then proceed with the operation of bleeding the hydraulic circuit (Paragraph 8.2)
Piston maintenance:
It is recommended to consider the following aspects:
-
The results of the checks and maintenance must be planned and documented;
-
Check the oil leaks from the oil nozzle and/or leaks on the heads
-
Set the lubrication intervals for spherical joints, supports and all components that are not self-
lubricated
-
The stem must always be retracted during long-lasting machine downtime