Husqvarna PG 820 RC Operator's Manual page 44

Problem
GRINDER SOUNDS
LIKE IT IS
OVERREVVING
GRINDER IS LEAVING
AN IRREGULAR
SCRATCH PATTERN
GRINDER IS JUMPING
AROUND
44 – English
TROUBLESHOOTING
Possible Cause
Small planetary drive motor not
plugged in.
Small motor not working (this can
be caused by fault with motor, fault
with wiring to the motor, or fault
with small variable speed drive or
frequency converter).
The large motor is not working.
This can be caused by fault with
motor, fault with wiring to motor, or
fault with large variable speed
drive.
Surface is too thick or diamond
configuration is incorrect
The diamonds are possible
incorrectly mounted or mounted at
different heights on the grinding
discs. Diamond tools can be mixed.
Head locks may be loose or
missing.
Resin tools may be mixed or have
picked up a contaminant.
Grinding discs can be worn or
damaged.
Grinding discs can be worn or
damaged.
Diamonds can be incorrectly
mounted or the grinding discs can
have diamonds at different heights.
Head locks may be loose or
missing.
Small motor not working (this can
be caused by fault with motor, fault
with wiring to motor, or fault with
the small variable speed drive)
Potential Solution
Check small planetary drive motor is plugged in.
Check small motor is plugged in. Check there are no
faults on small variable speed drive or frequency
converter. Check that small variable speed drive and
frequency converter is on. Check that small variable
speed drive or frequency converter is functioning
properly (unplug both motors, set display on keypad
to Output Frequency, switch machine to RUN, see if
numbers on screen change from zero and begin
counting up. If numbers stay on zero, small variable
speed drive or frequency converter is not receiving
run command from witch on control panel. Machine
needs to be checked by an electrician or Husqvarna
Construction Products.
Check that there are no faults on either the small or
the large variable speed drives. Reset if required at
the control panel on the handle bar.
Raise the machine by leaning on the handle when
starting.
Check that all diamonds are fitted correctly and are
the same height. Check that all segments are the
same grit and bond. In the event of uneven diamond
segments space out uneven diamonds evenly and
run machine on an abrasive surface till all segments
are equal heights.
Check that all head locks are present and tight.
Ensure that all resins are the same grit and bond and
free from contaminants. To clean resins briefly run
them on a lightly abrasive surface.
Check the grinding discs for broken sections or
excessive movement.
Check the grinding discs for damaged parts and
excessive movements.
Check to ensure all diamonds are fitted correctly and
are the same height.
Check to ensure all head locks are present and tight.
Check that the small variable speed drive is on.
Check that there are no faults on the small variable
speed drive. Reset if required, at the control panel
near the handle bars. Check that small variable
speed drive is functioning properly (unplug both
motors, set display on keypad to output frequency,
switch machine to RUN, see if numbers on screen
change from zero and begin counting up. If numbers
stay on zero, small variable speed drive is not
receiving run command from switch on control
panel.) Machine needs to be checked by an
electrician or a Husqvarna service agent.