Wanted a sds chuck for my spline chuck

SDS drill - the usual process of pulling back the outer sleeve of the SDS chuck should release either the bit or the chuck shaft so it virtually falls out or it can be easily withdrawn by hand - usually...

Some SDS attachments tend towards softness and with extended use can mushroom internally making them difficult to remove and sometimes nearly impossible. Twice I had had to resort to some serious brute force to remove SDS bits after heavy use.

There are SDS type chucks, both key and keyless, available commonly. Any large hardware store or specialist power tool shop will have them.

http://toolguyd.com/blog/wp-content/uploads/2014/02/Bosch-Keyless-SDS-Drill-Chuck.jpg
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It depends to where you want to apply your lubricant.
If you want to lubricate the chuck with the sds drill bit you simply add some cheap grease on the drill bit and the drill bit will slide easily on the chuck. On the other hand if you want to lubricate the sds drill machine then there is a special type super grease that you can buy from Dewalt in order to do so. Also since in order the super grease to be needed this means that you have used the drill a lot then also is needed to change o-rings, brushes and so on. So usually you have to ask for a service center to do it since they know how to do it properly and using the right kit.

You have to remove the striker bolt from inside the spindle first. to do this remove the internal circlip (not always easy) then you can tap the striker bolt out and then press the broken bit out.

The SDS chuck is an intergral part ot the rotary hammer drill assembly. You can get a standard chuck that has an SDS fitting on it and that will fit into your drill and give you standard drilling capabilities.

you can buy an SDS chuck that gos into a normal drill chuck,, it cant spin in the normal drill chuck as its got a hexsy drive on it its a much cheaper way to go and will fit any other drill you have or will ever get

Youcan only use standard drill bits with the use of a chuck attachment with the SDS type bayonet. These hammer drills use an SDS type drill bit which just pushes into the fitted chuck and are released by pulling back on the lock mechanism on the chuck.

the rubber cap in the sds chuck nose is only snap tight try to remove and dismantle the retractable locking pins.

I have a Skill 717, too. It has a hex shank. Here are a couple places that I've located that carry (some) parts:
www.icscuttingtools.com (pages 155 & 157)
www.bamanufacturing.com/page_15.htm

also try:
www.ereplacementparts.com
www.toolpartsdirect.com

tap it lightly with a ball pin hammer, if that dosnt shake it out try opening it and useing something to push it through