8.7 MANUAL AND EMERGENCY LOWERING
Attention : this process requires that the mechanical security of the lift has to
be disengaged during the lowering process.
If the mechanical safety locks are engaged, let them free as follows described:
Disconnect the electric power before effect the movement;
ensure personnel are not in the working area during the lowering steps of this procedure;
unscrew the knurled nut (1) from the block of solenoid valve (2);
remove the magnet (3) from solenoid valve (2);
place the knurled nut (1) on solenoid valve (2) and tighten; with the hand pump, pump
until the mechanical security locks are free;
Note : if the hand pump does not work, this must be bled as explained below.
Bleed the manual pump as follows described:
release the screw (1) and remove it;
fit the lever (2) pump until oil and air are coming out from the hole of the screw (1);
insert again the screw (1) and tighten during pumping, until no air is apparent in the oi
Carry out the emergency lowering of main lift, after disengaging the mechanical safeties, as
follows:
place a suitable object between the mechanical security locks and the rack of the platform to
ensure that the mechanical security locks remain disengaged during lowering;
unscrew the knurled nut (5) of the platform lowering solenoid valve (6);
remove the magnet (7) from solenoid valve (6);
insert again the screw (5) up the solenoid valve (6) and slowly tighten to lower the platforms.
he lowering speed increase by tightening the knurled nut (5).
Figure 37 –BLEEDING THE HAND PUMP
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