Lukas Concrete crushers - Manual (Page 40)

40
11. Troubleshooting
Trouble Check Cause Solution
Crusher arms move
slowly or jerkily when
activated
Are the hoses
connected
properly?
Air in the hydraulic
system
De-aerate pump
system
Does the pump
unit work?
Device doesn’t
perform at its given
power
Check the
hydraulic fluid level
in the supplying
pump
Insufficient
hydraulic fluid in
the pump
Top up hydraulic fluid,
de-aerate
Following release,
the star grip doesn’t
return to the central
position
Cover damaged
or star grip hard to
move?
Damage to the
torsion spring for
reset
Repair of fault by
authorised dealer,
specially trained
LUKAS staff or
directly by LUKAS
Soiled valve or
star grip
Defective valve
Other mechanical
damage (e. g. star
grip)
With mono-coupling-
system: hose
assembly cannot be
coupled
Pressure too high
(e.g. caused by
too-high ambient
temperature)
Set hydraulic pump
to pressureless
circulation
Coupling defective Coupling must be
replaced immediately
With mono-
coupling-system:
It is frequently not
possible to couple
hose assemblies
Check the
viscosity grade
and application
temperature of
the hydraulic fluid
used.
Hydraulic fluid
not suited to
the application
situation
Hydraulic fluid
must be replaced
(see chapter
“Recommended
hydraulic fluids”)
Coupling defective Coupling must be
replaced immediately
With quick-
disconnect-coupling-
system: hose
assembly cannot be
coupled
Is the pump
working?
Pressurised Relieve pump
Coupling defective Coupling must be
replaced immediately
Hydraulic fluid leak
at the hoses or the
connections
Are the hoses
defective?
Leakage, possible
damage
Replace hoses.