While you wait for answers, we may have found some information which could help you.
Click here for Replace Pull PetrolBosch al3640 cv?
How can I fix my Bosch Rotak 37 lawnmower?
Repairing a Bosch AL 3640 CV lawnmower charger?
How can I fix?
Bosh roteck battery mower shudders/spins but then stops?
Bosch AL 3640 CV charger repair & parts identification?