Bosch ALR 900 Original Instructions Manual page 17

For best results mow the lawn before reseeding. Promote the
spread of grass into bare and weak areas with good quality
lawn seed after raking/verticutting. Allow fresh grass seed to
root and establish before fertilising, where necessary water
to prevent fresh seeds drying out.
Ideal times for raking/verticutting are spring and late autumn.
Troubleshooting
The following chart lists problem symptoms, possible causes and corrective action, if your machine does not operate properly.
If these do not identify and correct the problem, contact your service agent.
 Warning: Switch off and remove plug from mains be-
fore investigating fault.
Problem
Machine fails to operate
Machine functions
intermittently
Garden product labours or
belt squeals
Cutting tines/blades not ro-
tating
Excessive vibrations/noise Cutting tines/blades damaged
Bosch Power Tools
Possible Cause
Power turned off
Mains socket faulty
Extension cable damaged
Fuse faulty/blown
Possible clogging
Motor protector activated (AVR 1100
only)
Raking/Verticutting too low for the condi-
tions
Obstructed rotor
Blocked side grilles
Grassbox full
Extension cable damaged
Internal wiring of machine damaged
Worn/Missing tines/blades
Conditions too wet
Too much debris on the ground
Possible clogging
Raking/Verticutting too low for the condi-
tions
Grass too long
Very uneven surface
Grassbox full
Height of cut too low
Cutting tines/blades obstructed by grass
Belt is slipping or is damaged
Also lawn can be maintained by raking/verticutting on a high-
er height of cut setting after very six cuts.
Corrective Action
Turn power on
Use another socket
Inspect cable, replace if damaged
Replace fuse
Check underneath the garden product and clear out
as necessary (always wear protective gloves)
See below*
Increase height of cut
Clear obstruction (always wear protective gloves)
Clear debris from the outside of the side grilles
Empty the grassbox regularly
Inspect cable, replace if damaged
Contact Service Agent
ALR 900:
Fit replacment (see "Removing/Fitting Raker Tines")
AVR 1100:
Contact Service Agent
Increase height of cut (see "Raking/Verticutting Tips")
See below*
Check underneath the garden product and clear out
as necessary (always wear protective gloves)
Increase height of cut
Cut grass
Increase height of cut
Empty the grassbox regularly
Increase height of cut (see "Adjusting the Cutting
Height")
Clear obstruction (always wear protective gloves)
Contact Service Agent
ALR 900:
Fit replacment (see "Removing/Fitting Raker Tines")
AVR 1100:
Contact Service Agent
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