my tractor will not crank and it is a diesel

[homewardflow]

i replaced the fuel filter and now it will not run
this is a 245 massey ferguson tractor

 

[JSanders10]

Very likely air in the fuel line, not uncommon when changing a filter.

Not sure where on the 245, but you've got a manual finger fuel pump somewhere, find it and pump it, may take hundreds of pumps, and keep trying to crank.

I advise having a battery charger nearby or hooked up while doing the cranking.

See this older thread, and the images therein.
http://www.tractorbynet.com/forums/massey-ferguson-owning-operating/174179-fuel-line-priming.html