129
Maintenance and Service
Operator's Manual GB
8.6.2
Fault
Probable cause
Action
Stabiliser extensions do not
slide out.
Stabiliser extensions are still
locked.
Unlock the stabiliser exten-
sions.
Hydraulic fault.
Go to a HIAB service work-
shop.
The stabiliser extensions do
not slide out/in. (Chain-driv-
en stabiliser system)
Incorrect chain tension.
Contact a HIAB service
workshop.
The stabiliser leg cylinder
cannot keep the truck load
and it goes inwards.
Check valve damaged.
Go to a HIAB service work-
shop.
Cylinder internal leakage.
Go to a HIAB service work-
shop.
Soft ground surface.
Set again the stabiliser led
onto the ground or add an
extra support plate between
the cylinder and ground.
Slewing support cylinders
do not turn
Three-way valve failure.
Go to a HIAB service work-
shop.
Irregular slewing move-
ments and unusual noises in
cranes with rack and pinion
slewing system.
Insufficient oil in the hy-
draulic system.
Top up the oil tank.
Insufficient oil in the slew-
ing housing.
Top up the oil in the slew-
ing housing to the required
level.
The upper slewing bearing
is not properly lubricated.
Lubricate the bearing.
The bearings in the slewing
housing are damaged.
Go to a HIAB service work-
shop.
Irregular slewing move-
ments and unusual noises in
cranes with continuous
slewing system.
Insufficient oil in the hy-
draulic system.
Top up the oil tank.
Insufficient oil in the gear
box.
Top up the oil in the gear
box to the required level.
Bearing assemblies and pin-
ion are not properly lubri-
cated.
Lubricate the bearing while
slewing.
Bearing assemblies or pin-
ion are damaged.
Go to a HIAB service work-
shop.