38
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PROBLEM
REASON
CORRECTIVE ACTION
Boom(s) come down by itself.
Dirt in load control valve or
faulty valve.
Dirt in emergency lowering
valve or faulty valve.
Emergency lowering valve(s)
don’t work when emergency
lowering button is pushed.
Lift cylinder seals faulty.
Clean valve with compressed
air, if that doesn’t help change
valve.
Clean valve with compressed
air, if that doesn’t help change
valve.
Check emergency lowering
fuse, if all right check also
emergency lowering valve(s)
separately.
Change lift cylinder seals.
Outrigger gives in.
Make sure that the ground
doesn’t give in.
Air in outrigger cylinder(s).
Dirt in outrigger cylinder check
valve.
Faulty check valve.
Faulty outrigger cylinder seals.
Put extra support plates under
the outriggers or move to
another place.
Drive outriggers up and down a
couple of times.
Clean valve with compressed
air.
Change valve.
Change outrigger cylinder seals.
Platform tilts backwards by itself
when booms are down on
transport supports.
Air in hydraulic system.
Dirt in load control valve of self
levelling cylinder or faulty valve.
Faulty self levelling cylinder
seals.
Start the engine/motor, drive the
platform to extreme end
positions by using the lever no.
15 (see page 15). If this d
oesn’t
help, do the air bleeding of the
platform self levelling system
(there are bleeding screws in
the self levelling cylinders).
Clean valve with compressed
air. If that doesn’t help, change
the valve.
Change cylinder seals.