HOEFLON C4 - Page 83

User manual C4 – C6
83
Malfunction
Cause
Solution
The compact crane does not
function properly, jerks
Too little oil in the hydraulic
system
Hesitation when operating
lever on remote control.
Check the hydraulic oil level.
Vibrations in the crane
Oil temperature too low
Increase oil temperature by
raising and lowering an
outrigger leg
Telescopic section does not
extend or retract fully or does
not do so easily
Guides not sufficiently
lubricated
Lubricate the guides
The crane does not slew well
Turntable not sufficiently
lubricated
Damaged or worn rotation
mechanism
Lubricate the turntable
Overhaul the turntable
mechanism
A number of functions do not
work
Problem in electrical system
Malfunction of load moment
limiter
Check sensors
Check emergency stop button
Reduce the load on the crane
Winch cable pulling force is
incorrect
Leaking winch cylinder
Repair leak
A function does not work
Problem in electrical system,
electrical motor has stopped
working
Check the fuses, emergency
stops, blade-type fuses (15 A)
and circuit breaker (16 A) in
the electrical cabinet
Movements are slower than
usual
Oil filter restricted
Hydraulic pump defective
Clean oil filter
Replace hydraulic pump
Engine does not start
Discharged battery
Check whether the battery
charger is indicating a fault
code. Reset battery charger by
disconnecting 230 V plug,
waiting 10 sec. and plugging it
in again.
Crunching sound during
movements
Pivot points not sufficiently
lubricated
Lubricate pivot points in
accordance with the
lubrication chart