Re: Loose bolts on J.Deere

Posted by Steve@Advance on January 04, 2020 at 16:53:41 from (66.169.147.211):

In Reply to: Loose bolts on J.Deere posted by calvin innes on January 04, 2020 at 14:26:50:

There is a similar topic on this over on Restoration and Repair.

As said, the holes are probably wallowed. They can be drilled over to the next size, or if not enough room, repaired with a Recoil kit, or thread insert bushings.

How ever it is done, it is necessary the holes be drilled straight using a mag base drill or a drill guide block. Attempting to hand drill without a guide will always result in a crooked, wallowed hole causing more harm than good!

Another problem is the mating surfaces are no longer flat. You can try to clean them up with a file or a grinder, but it is very easy to make the situation worse. If it is impossible to remachine the surface, best to leave it and just debur the holes, be sure there is no paint or grit between the surfaces.

Then go back with grade 8 bolts and heavy grade 8 washers. The washers are as critical as the bolts. If they crush, the bolts will be left loose.

If you choose to use Locktite, clean the holes with carb cleaner, get rid of all traces of oil. Red Locktite the bolts, use primer for the best results. Torque the bolts per the recommended torque found on torque charts.

But, one of the drawbacks to using Locktite, it is difficult to get a good retorque on them after the first use. If the surfaces are less than perfect, real good chance it will settle in and loose the torque on the bolts. You may want to run it without Locktite for a while, retorqing them several times until there is no more loss of torque, then take them out one at a time, clean the oil out of the hole and off the bolt, then apply the Locktite.

Still, keep a close watch on them. If they come loose again there may not be anything to work with next time!

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