Where would we get as manual for the d170 john deere grass bagger

Make sure hydrostatic transmission drive is not in bypass and transmission drive belt has proper tension.

See operators manual
http://manuals.deere.com/omview/OMGX25658_19/?tM=HO

Repair your vehicle right away. Just click on the link I attach.
John Deere Model D170 Lawn Tractor SERVICE REPAIR MANUAL

grass catchers need special shaped or good blades to throw the cut grass into the bag
check/ replace the blades

your manual will

Yes. I use gator mulching blades during the summer. They won't bag a thing. The original/standard blades will bag some grass/leaves, if they are dry and not too dense, but they are prone to clogging. The high lifts work much much better.

I get mine on amazon. The shipping is free. LA145 48" deck. Part GX21785.
http://www.amazon.com/gp/product/B00CAXMAG2/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1#product-description-iframe

well if you READ your owners manual its tell u how to reset it or fix it...

Change to a bagger blade that has more lift (two blades)

Curved edges go up.

John Deere LA 125. Chute keeps clogging up with grass.