On 22 May, 23:40, "The Medway Handyman"
wrote:
Using my Wickes/Kress SDS today in chisel mode & noticed a black sludge
creeping from the chuck along the chisel. *Nothing I've ever added to the
chuck, because I've never added anything.

I suspect that 'this is not a good thing'.

Any ideas?

--
Dave - The Medway Handymanwww.medwayhandyman.co.uk

My SDS (chepao from screwfix) has always done it, it comes from the
hammer action at the back, when it warms up it runs out the front!!
they must have known as there is a little hatch, and a pot of grease
to top it up! been working fine (and hard) for 5 years !!