36v sds faulty?
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Plumber / Heating, air conditioning installation
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Hi all i have the Bosch GBH36VFLi which i have had for about 3 years briialint bit of kit and it's took a beating over the years doing from 7mm holes for boilers and radaitors to upto 32mm holes for gas pipes or waste pipes with TCT core bits which it says on the side of the drill it can handle much bigger holes with a TCT core bit, now about last july it lost alot of power so i changed the brushes and it was back on form, but now it seems to have lost its kick and rotation and it keeps stopping and starting, am not sure if its the trigger switch? not sending the right amount of power to the rest of the drill, any help would be great as i dont know if to order a part to be replaced or if its past saving and get a new sds.  
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Electrical installation
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Hammers have a hard life.  Constant impacts, esp. of the intense, percussive sort, are de rigeur.  Additionally, theres an almost constant bathing in dust, sweat, rain, humidity and other nasties that are almost guaranteed to adversely affect electrical contacts, rheostats, armatures & carbon brushes and the assorted paraphernalia within an SDS drill's electronics package.

Sometimes a good blowout from a high pressure air hose in a motor garage is all that's needed to give any tired dust-prone tool a new lease on life. An essential, regular preventive maintenance procedure for sanders, grinders & SDS drills of all sizes in my opinion. Then there's the possibility of physically cleaning the switch contacts, replacement of the faulty component or ultimately of the tool itself if necessary.

I wore out a GBH18 after about 30,000 odd holes.  Not a bad innings, in my opinion, and within personal expectations.  I'd say that 32mm holes for the GBH36VFLi is just too much work for a relatively underpowered tool.  Having used one professionally myself for some years, I'd personally be asking for no greater that 20mm regularly from this tool, with perhaps 25mm an absolute max.  Using the pi formula for surface areas/volumes of cylinders, a 32mm hole is some 24 times both the volume & surface area of a 7mm hole!

32mm is in fact about the recommended max. for the GBH4-32 mains drill, a tooll with (by the feel of it) maybe twice the power, and the relative stamina of mains electricity!  In fact regular 32mm (1 1/4") drilling in slabs & other hard substrates is more the province of SDS max tooling in my opinion.  It's little wonder then that your tool has given up!  My GBH4 is my go-to tool (out of a variety of some 9 assorted SDS+ & Max drills) for hammer drilling in the 12mm-20mm range and 3/4" chasing in concrete, brick and other hard masonry materials.

A GBH18 works ideally well for small fixings <10mm, a GBH36 for 12-16mm, the GBH4 for 16-25mm & bigger 1500 & 1700w Max drills for bigger stuff.  I do realise that most tradies won't be carrying around anything such a large arsenal of tools, and require more generalised tools, but my point is still valid I believe.  A GBH36 is just too big to efficiently drill 7mm fixing holes all day, and occasional 32mm access throughbores.  Much better a combination of a GBH18-EC for fixings, and a much bigger mains tool if possible would be ideal for this combination of holes.  If you don't have access to mains power, then perhaps a new GBH36VF-Li Plus might just, or perhaps only almost be slightly better than your current tool for the bigger holes.

I'd still recommend a GBH18 though.  Not at all a toy, having a dedicated fixing hammer constantly setup for your most constantly required fixing hole size will be a revelation and quantun leap in overall efficiency I believe.  At least, it certainly was for my requirements:  Industrial/commercial elecrical installation.  The ability to safely use only one hand for drilling fixings is quite revelatory.
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Cheers the informative reply Magil, I was going to get the dewalt brushless combi, impact driver and sds  they are  £80 cheaper than the bosch but only come with 2x 2ah batteries where as the bosch set comes with 2 x 5ah.

The bosch set am looking at getting is GSB 18 V-EC Combi Drill , GDX 18 V-EC Impact Driver and the Bosch GBH 18V-EC 18V sds, my GBH 36 VF-LI has done me well but it's not helping my carpal tunnel in my right hand when drilling above my head plus its a pain as my power tool set is mismatch atm a ryobi impact driver a top end Hitachi combi Hitachi DV18DSDL/JJ 18v then my GBH 36 VF, 3 different chargers 3 different batteries in my power tool bag, it's an absolute pain.