Husqvarna Automower 420 Workshop Manual page 54

5. Charging
Note: Refer to the Operator's manual for more information about how to rectify errors.
8.2.1 Symptoms during mowing
Symptom
Uneven mowing results
The product runs at the wrong
time
The product vibrates
The product mows for shorter
periods than usual between
charges
Both the mowing and charging
times are shorter than usual
The product travels in a small
circle or one wheel locks up
when turning instead of rotat-
ing backwards.
54 - Troubleshooting
Cause
The product works too few hours per day. Increase the working hours.
Work area too large.
Blunt blades.
Long grass in relation to the set cutting
height.
Incorrect lawn coverage settings.
Does not follow the guide wire to the
areas specified.
Accumulation of grass by the blade disc
or around the motor shaft.
Weather timer reduces the mowing time
too much.
The start and stop times for mowing are
incorrect.
Weather timer reduces the cutting time.
Wrong number of blades creates an im-
balance.
Grass or a foreign object is blocking the
blade disc or wheels. The cause may al-
so be lower battery capacity.
Lower battery capacity.
The gearbox of the wheel motor is slip-
ping.
6. Miscellaneous
Action
Try to limit the work area or extend the
working time.
Replace all the blades and screws so
that the rotating parts are balanced.
Increase the cutting height and then
gradually lower it.
Check the lawn coverage settings and
optimise them for the installation.
Check the guide signal. Refer to
Info - Loop on page 10 .
Check that the blade disc rotates freely
and easily. If not, the blade disc may
need to be removed and grass and for-
eign objects removed.
Check and change the settings. Refer to
Operator's manual.
Adjust the start and stop time settings for
mowing.
Check and change the settings. Refer to
Operator's manual.
Make sure there are no blades missing or
that more than one blade is mounted on
the same screw.
Remove and clean the blade disc. Per-
form a battery test to determine the bat-
tery's capacity. Refer to
page 58 .
Perform a battery test to determine the
battery's capacity. Refer to
on page 58 .
Check the function of the wheel motors
when idling. The battery voltage should
be more than 18 V in this test. Check that
both wheel motors start with 50% power.
Then increase the power to 100%. At
100% the speed of each wheel should be
at least 35 cm/second. Check that the
gearboxes of the motors are not slipping
by blocking each wheel. When blocking a
wheel, the speed should be 0 cm/second.
Replace the wheel motor if there is a
fault.
Tools -
Battery test on
Battery test
1191 - 001 -