Those D2 recoil springs are under great pressure. They are DANGEROUS. Read the service manual and review the past posts about this subject before you do anything.
At the dealer we changed lots of broken springs and we,d weld a couple pieces of angle iron on the end plates to secure the spring and then then remove it from the tractor.Possibly you could do the same and install a new bolt and nut or take it to a dealer or where they have have a big press and then disassemble it after you cut the angle iron off and relieve the press. Then a new bolt can be inserted down the top end plate and again press it together and the nut installed to button it up. There is a demention for the spring length so you,ll need it. I don,t have the chart here for them but the dealer would or maybe someone on here.
The service manual says 17 1/16" excluding the guides.
If the bolt is all that,s broke then it is dangerous to remove so that,s why I said we welded two pieces of angle iron on each end of the plates and then remove it.Also if the spring is broke we always took a cutting torch and cut more of the spring to relieve the tension and then remove it.One time at the shop one came in with a broken bolt and the mechanic took the track off to work on the under carriage and he tied back the idler and spring and after he removed the track he cut the chain and that idler and spring assemby flew 20 ft. out the door.It was a D7 or D8 I,m not sure as it,s been too long ago to remember so they are a dangerous thing to work (repair) if you never had any experience working on a broken one.
If the bolt is all that,s broke then it is dangerous to remove so that,s why I said we welded two pieces of angle iron on each end of the plates and then remove it.Also if the spring is broke we always took a cutting torch and cut more of the spring to relieve the tension and then remove it.One time at the shop one came in with a broken bolt and the mechanic took the track off to work on the under carriage and he tied back the idler and spring and after he removed the track he cut the chain and that idler and spring assemby flew 20 ft. out the door.It was a D7 or D8 I,m not sure as it,s been too long ago to remember so they are a dangerous thing to work (repair) if you never had any experience working on a broken one.
If the track is tight, you have to relieve the pressure to remove the master link pin.
To do this, loosen the track tension adjustment as much as possible. Park the tractor with the master pin in a good position to remove it. (Usually either at the front of the idler or back of the sprocket).
To compress the spring, you can then connect a heavy chain between the front idler and the spokes of the sprocket. When you (carefully!) move the tractor, the chain will pull the idler back, compressing the spring. Lock the brake, stop the engine and put it in gear, engage the clutch, etc so it can't move and then break the track.
Then you can carefully let the sprocket rotate forward again relieving the pressure on the spring. Replace the spring bolt, set the length and reinstall.
If the track is tight, you have to relieve the pressure to remove the master link pin.
To do this, loosen the track tension adjustment as much as possible. Park the tractor with the master pin in a good position to remove it. (Usually either at the front of the idler or back of the sprocket).
To compress the spring, you can then connect a heavy chain between the front idler and the spokes of the sprocket. When you (carefully!) move the tractor, the chain will pull the idler back, compressing the spring. Lock the brake, stop the engine and put it in gear, engage the clutch, etc so it can't move and then break the track.
Then you can carefully let the sprocket rotate forward again relieving the pressure on the spring. Replace the spring bolt, set the length and reinstall.
Paul, as I stated before at the dealer we welded an angle iron on each end plate to stabilize it front to back and then removed it and then put it in our big press we had at the dealer and stabilized it and cut the angle irons away from the two end plates and then relieved the pressure carefully on the press till the spring was relaxed.I don,t imagine a springs would be very cheap today so I,d save them if possible if it,s not broken.