Fault
Probable cause
Action
Leak on hydraulic system: leaking
coupling, hose or line. Danger! Keep
away from any oil leak.
1. Push in the Stop
button [If fitted].
2. Disengage the PTO.
3. Contact a HIAB
service workshop.
Stabiliser extensions do not slide out.
Stabiliser extensions
are still locked.
Unlock the stabiliser
extensions.
Hydraulic fault.
Go to a HIAB service
workshop.
The stabiliser extensions do not slide
out/in. (Chain-driven 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
workshop.
Cylinder internal
leakage.
Go to a HIAB service
workshop.
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
workshop.
Irregular slewing movements and
unusual noises in cranes with rack
and pinion slewing system.
Insufficient oil in the
hydraulic system.
Top up the oil tank.
Insufficient oil in the
slewing housing.
Top up the oil in the
slewing 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
workshop.
Irregular slewing movements and
unusual noises in cranes with
continuous slewing system.
Insufficient oil in the
hydraulic 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 pinion are not
properly lubricated.
Lubricate the bearing
while slewing.
Maintenance and Service
106
HIAB K-HiPro 285-425 X4