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If look at brushholder unmount it and make clean look if the brushes are go good to each other most causes on this BOSCH tools is that the brushes 70% are hanging on dirth in the brush holder (brushplate) 16 first problem second true problem are the 2 suppression coils (adapter module 817 ) on the electric field. and also parts pos 19 left right switch contacts for the brushes can sometimes on ofthem be broken.
There is no oil filler hole - you have to open the gearcase up (#873) to put oil in. If your hammer is leaking and losing oil you should put a service kit in it and fresh oil. Service Pack 1617000430 for Bosch Power Tool eReplacement Parts
As you can see this is an involved process and I would strongly recommend bringing it to a service center to have a qualified tech do this one.
There is no oil reservoir - the gearcase is what holds the oil. You should not have to add oil - if the tool is leaking and becomes low on oil it needs a service kit. Service Pack 1617000430 for Bosch Power Tool eReplacement Parts As you can see this is an involved repair and I would strongly suggest letting a trained tech do this one.
There is an o-ring on the striker that will wear down over time, this needs to be changed, of worst case the striker has stuck in the hammer piston. Both these repairs should really be done by a service center as these hammer drills are complicated to repair if you are not familiar with them. Any Bosch service center will be able to help you. Just go to the Bosch website and find a center in your area.
If you are getting leakage out the chuck end, the shaft seal needs replaced. You can get it done at a Bosch service center or get the seal and replace it yourself. Don't wait to long there is only a limited amount of lubricant in the tool.
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