46
ISSUE
CAUSE
CORRECTIVE ACTION
The boom comes down on its
own.
The boom comes down on its
own.
Dirt in the load control valve or
a defective valve
Dirt in the emergency lowering
valve or a defective valve
The emergency lowering valve
does not react to the control
button.
Lift cylinder seals are faulty.
Clean valve with compressed
air, and if that does not help,
change the valve.
Clean valve with compressed
air, and if that does not help,
change the valve.
Inspect the emergency lowering
fuse. If it is in good condition,
check whether the emergency
lowering valve has come loose.
Change the cylinder seals.
Outrigger gives way.
Make sure that the ground does
not give way.
Air in the outrigger cylinder(s).
Dirt in the load check valve.
Faulty load check valve.
Faulty outrigger cylinder seals.
Put extra support plates under
the outriggers or move the
machine to another place
Drive outriggers up and down a
couple of times.
Clean the valve with compressed
air.
Change the valve.
Change the cylinder seals.
The platform tilts backwards by
itself when the booms are down
on the transport supports.
Air in the hydraulic system.
Dirt in the load control valve or
a defective valve.
Cylinder seals faulty.
Start the combustion engine /
electric motor, drive the
platform to the extreme end
positions. If this doesn’t help, do
the air bleeding of the platform
self-levelling system (the self-
levelling cylinders are equipped
with bleeding screws)
Clean the valve with compressed
air, if that does not help, change
the valve.
Change the cylinder seals.
