Your saying that the link is free to move with nothing binding??? If it is then look at how the link pivots. I have seen them that are not made correctly. The pivot points/bolts should never line up even close to a straight line. The center pivot point/bolt is supposed to always be higher than the stop bolt and mounting bolt. This way when the tail wheel lifts the rear of the deck the link pivots upward and thus allows the lift linkage to shorten. The most common issue I have seen is the bolt closest to the hitch should have a bushing on it that has a slightly larger diameter than the other spacers. So when the pivot link is in the down or lift mode the pivots pints still do get in a straight line. I think what happens is during assembly the wrong bushing or even no bushing gets used there. So the linkage pivots line up. So if the tail wheel lifts the link age is locked and will not pivot up. I have also seen older mowers with this area worn and they will lock/break over center too. On those usually building up the end of the pivot bracket with welds helps.
An easy way to test this is when the mower is unhooked you should be able to push back on the top link bracket and make the linkage pivot/ shorten. If you can then you need to look at why the linkage is not working. I have taken the bushing out and put in a stack of washers with a larger outside diameter.
You can see the center line on the BB840 in the top picture. It is close to straight so it takes more force to make the linkage compress. You can see the two smaller bolts just behind the pivot arm. The front one of them should have a bushing on it that acts as the stop I am talking about. Even if your does you still need the pivots to be more out of alignment.
I know the second picture is of a different model you can see how the hitch pivot points are misaligned more. So it takes less force to compress the hitch. So work on your hitch so it is closer to looking like that.
Truthfully I think they kind of mess up when they engineered the hitch on the BB840 when compared to other woods models.
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