115
Maintenance and Service
Operator's Manual GB
8.6.2
Fault
Probable cause
Action
Crane does not work proper-
ly:
One or more crane functions
do not work, or not proper-
ly.
Lifting capacity is much less
than normal. Operating
speed is significantly re-
duced.
The service lamp is lit.
The system has detected a
fault.
Contact a HIAB service
workshop.
Cane performance when op-
erating it with the controller
is unsatisfactory.
The pressure-reducer filter is
clogged.
Replace the pressure-reducer
filter.
Boom system cannot keep
the load height, and it goes
down by itself.
Load holding valves on the
first boom or second boom
damaged.
Go to a HIAB service work-
shop.
Cylinder internal leakage.
Go to a HIAB service work-
shop.
Boom extension cylinders
do not follow the sequence.
Cylinder internal leakage.
Go to a HIAB service work-
shop.
Boom extensions shake dur-
ing extending/retracting
function.
Cylinder internal leakage.
Go to a HIAB service work-
shop.
Sequence screw in cylinder
head loose.
Tight the screw in the right
position.
Boom extensions cannot
keep the load height and
they move out by them-
selves.
Extension load holding
valve damaged.
Go to a HIAB service work-
shop.
Cylinder internal leakage.
Go to a HIAB service work-
shop.
Add-on equipment does not
work properly (rotator,
hoist, etc.)
Connectors not properly
connected.
Reconnect the add-on equip-
ment, according to the in-
structions.
Other defect.
Go to a HIAB service work-
shop.