The JD 2640 is easy to fix a leaking rear PTO. I am assuming independent 540 PTO without reverser and front PTO. This is the most common one. If yours is different let us know. There are 4-5 different PTO options on the JD 2640 and also early an late9tiger stripped hood decals) serial number breaks too.
1) Engage the manual PTO lever at your left heal. Leave it engaged. It shifts a collar forward onto the shaft coming back from the PTO clutch. IF you leave it disengaged it will fall off the shaft and you will have to take the rockshaft housing off to reinstall it.
2) Drain all the hydraulic oil.
3) Remove the bolts out of the PTO rear quill #17. The entire housing and shaft will come out the back without dong anything else.
4) The back of the housing has a snap ring grove and snap ring # 13 that holds the bearing in the housing. Remove this snap ring. Now the PTO shaft and bearing will come out the front of the quill/housing. You may have to press it out but usually when one is moving back and forth the snap ring has come out and the housing/bearing will move out easily.
5) You can now remove the seal from the bearing housing/quill. I always apply a light coating of silicone sealer around the seal as I install it back into the housing.
6) If your rear PTO shaft bearing is fine you can just reinstall it. I usually replace it on a tractor I do not know the service history on. To remove it from the PTO shaft #11 you need to remove snap ring #12. Then the bearing is a light press fit onto the shaft.
Just reverse this and it will go back together.
Things to watch for while doing this.
A) The PTO shaft usually has worn edges on the 540 external spline. These can cut your new seal when you slide the PTO shaft back into the housing/quill. I do two things normally. The first is to take emery paper and polish the OD of the shaft and knock the edges off the 540 spline. The second is to protect the seal from the spline with thin plastic while sliding it past the seal. I have some old Micro fiche cards that work great for this. I have used several layers of waxed paper too.
B) I hope you problem is just the bearing retaining snap ring #13. This snap ring holds the shaft from moving in and out of the bearing housing/quill. I had a JD 2640 and the snap ring grove was broken off the back of the housing/quill. I ground it down flat with the bearing and installed three bolts to hold the bearing in. I had to drill and tap them just right in the housing to work.
C) I always use Loctite bearing retaining compound on the outside of the PTO shaft bearing. They can become lose and wear the housing to where the bearing is loose in the housing.
The thing to really watch on these tractors is that your PTO shafts slide easy. If you have one that slides hard it will pull out when raised with the three point. The housing/quill is quite strong in the PULL direction. Then when you lower the lift the PTO shaft is pushed back into the housing or towards the front. When this happens that one snap ring and small cast steel grove are all that holds it from moving forward. I have seen many of them broken due to hard sliding shafts.
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