Laski LS 160 - Troubleshooting Common Malfunctions; Loading Roll and NOSTRESS System Faults

Chipper LS 160T
49
Throttle valve closed
Check up manual speed regulation for
loading
Loading activated
Press the green button for loading
Failure of NOSTRESS
system
Measure voltage on coil of
electromagnetic valve; it should be  0
at max. speed
Faulty coil of
electromagnetic valve
Coil replacement
Broken leads
Check up wiring for integrity
Faulty hydraulic pump
Check up oil pressure
Pump replacement
Faulty electric
switchboard
Coil replacement
Loading rolls turn off
also while chipping
Loading rolls cannot
be set in motion again
after turning the
machine off
Excessive speed of
chipping wheel and
PTO shaft
Reduce the PTO shaft speed
Working speed of the chipping wheel
must not exceed 1500 rpm.
Blades touch opposite
edge
Wrong setting of
clearance
Set distance to 0,5 – 1 mm
Loosen blade bolts
Tighten up fixing bolts
Clearance of chipping
wheel bearings
Tighten up fixing bolt of wheel on its
shaft
NOSTRESS system
out
of function
Blown fuse
Replacement of fuse 7,5 A
Faulty electronic
control unit
Replacement of fuse 4 A (inside
control unit)
Faulty speed sensor –
LED is not flashing
Check up wiring
Loading chute gets
clogged
Sensor replacement
Discharge duct gets
clogged
Too low speed of PTO
shaft
Stop loading and increase speed at
chipping. Min. working speed of PTO
shaft at chipping is 350 rpm
Discharge duct
deformed
Repair/replacement
Too small, dry or rotten
materials
Mix before loading
Loading rolls
overloaded with
material
Reduce loading roll speed