You need to be concerned about your overall foundation. If the crack is
not properly filled you may have more shifting and more cracks.

I would contact an equipment rental company and tell them what you want
to do. Likely they have a special tool you can rent and do it yourself.

I would search the internet for assistance. On our website we talk
about home inspections and have a section that deals with cracks in the
basement. You may want to check it out.

Steve
@ www.buyingahouseandsavingmoney.com