706 range transmission, doesn''t stay in gear

First off, I hope everyone out there is well. My 706 gas will not stay in gear. There is a lot of slop in the range lever and linkages. I'm going to say that this tractor had a bit of a rough life before I got it. The park lock does not always engage. The range selector has quite a bit of slop, and I hear a loud clicking sound toward the right side when backing up. I'm pretty sure a transmission rebuild is in it's future. I'll be going through the archives here, So Tractor Vet, you won't have to re-type your excellent descriptions again.

Common problem with '06 series tractors. Most likely the pivot in the range cover is worn/wallered.Easiest way to fix is to buy a rebuilt range cover. However,you can bore the hole and install a bushing. The pivot shaft will also be worn and have to be addressed as well.The shift cam will also have wear,but probably not enough to cause problems.Look at the linkages. Any slop there is accumulative.A sixteenth of an inch on top can become a half inch when it reaches the bottom.The park lock could simply need adjusting,or it can be worn off,or broken. Extreme case can see the reverse gear missing a tooth.This comes from 'engageing' while still moveing.Park lock can be addressed when the range cover is removed.You can buy an 'improoved' park lock that is spring loaded. Much better.

Ok so i have my Clutc h and T/A adjustments burnt innto your head , What is going on here comes from all this being out of adjustment and SLAM shifting . This will cause everything to ware faster and get loose . The reason it will not stay in gear is due to probably broken and missing rollers and detent spring under the range transmission cover . You probably will find that the shifter cam is also pretty woren and the shift shaft has the key way wollowed out and a broken roll pin . You may also find that the key way in the rev shifter shaft is toast . You clicking while backing up tells me that rev . driven gear has a couple teeth missing from someone dropping it in park while moving or she was parked on a hill with the over center park lock out of adjustment or she had a big load pushing on her and she jumped out of park and munched a coup-le teeth off the driven gear as that is what the park lock engauges . Every 06-66 that ever came thru the shop that i worked on i upgraded it to the spring loaded park lock like the 86's have . The top range cover where the shifter lever goes thru probably either need rebushed or replaced . You may need to replace the shifter cam . Fixing the CLICKING means replacing the rev driven gear and FUN times as this will require a total tear down of the rear end down to bare case as it is the last gear out and first back in . You do a split at the speed transmission and you have to drop out the PTO driven gear up in the speed transmission as you make the split since the PTO drive shaft comes with the rear . How you do this depends on what all you have to work with . If you have the unit to support and roll the back away makes it easier . As you place the ft splitting stands to support the ft. half then rooll the back half away . If you only have a rolling ft. stand you can still do this by supporting the ft. and removing the tires and wheels along with the top rock shaft housing and i always remove that first then the tires and wheels then the axle housings then get her stipped down as much as possible before i make the split usen a cherry picker and have done a couple on the farm in some not so nice conditions with a stinky manure bucket and a bad loader operator.
Some times i think i should write a book on the life of a tractor mechanic doing on farm repairs .

Please do, you have a lot of history and knowledge that will be lost forever if you don't. I wish I had knowledge that my Dad had with his H.

To the tractor vet, I assure you, if you were to write a book. I would buy it and strongly recommend it. I'm not making a request that you do. I, for one, deeply appreciate your posts and willingness to share information. You, along with Janicholson, Barnyard engineering and several others on these forums are a large part of why I like this site. Thank you.