X758 Deck leveling problems solved
- Thread starter kgriffis
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beenthere
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- JD_4x2_Gator, JD_4300, JD_425, JD_455 AWS, added JD_455, JD_110, JD_X485(sold)
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Chris_VA
Bronze Member
Thought I'd drop back in and let you all know what I THINK might be one issue.
The nylon lock nuts (item 16 in the parts diagram) seem very loose. I can move them on the rod by hand (difficult but I can move them). So purchased 2 new lock nuts and they are very tight. Much tighter than the old ones. That COULD explain why the deck adjustment moves in such a short amount of time. The vibrations while running could cause these nuts to back down the rod and the deck could get unlevel I guess. I will put these new ones on, adjust the deck and make a paint mark and see if they move.
However, this still does not explain why I can adjust the deck at one level, say 2 1/2". Then raise it to, say, 3 1/2" and it be unlevel immediately. That has to be some geometry issue I'd think. The little arms (items 21 and 22) are both clocked the same and travel the same through the entire stroke. I took one of them off and the square end of the rockshaft they mate with looks fine. No signs of any wear there. I took the draft arm (17B) off and from my measuring and working with it on a flat surface, it seems fine and not warped or sprung.
If I can get the dang thing to stay level for a decent amount of time, I won't worry about issue number 2. I rarely change mowing heights but maybe twice per year depending on the weather.
Will keep you posted.
Chris
The nylon lock nuts (item 16 in the parts diagram) seem very loose. I can move them on the rod by hand (difficult but I can move them). So purchased 2 new lock nuts and they are very tight. Much tighter than the old ones. That COULD explain why the deck adjustment moves in such a short amount of time. The vibrations while running could cause these nuts to back down the rod and the deck could get unlevel I guess. I will put these new ones on, adjust the deck and make a paint mark and see if they move.
However, this still does not explain why I can adjust the deck at one level, say 2 1/2". Then raise it to, say, 3 1/2" and it be unlevel immediately. That has to be some geometry issue I'd think. The little arms (items 21 and 22) are both clocked the same and travel the same through the entire stroke. I took one of them off and the square end of the rockshaft they mate with looks fine. No signs of any wear there. I took the draft arm (17B) off and from my measuring and working with it on a flat surface, it seems fine and not warped or sprung.
If I can get the dang thing to stay level for a decent amount of time, I won't worry about issue number 2. I rarely change mowing heights but maybe twice per year depending on the weather.
Will keep you posted.
Chris
jonsstihl
Veteran Member
you may want to take a look at the front draft arms, maybe something is bent. the rear arms are hooked together. the only way the level would change when raising or lowering the height is if the length of the arms on the rockshaft are different from side to side. I know there were changes in the rockshaft and arms so you may have a hybrid configuration of new and old arms.
Chris_VA
Bronze Member
Thanks for the note, I'll check the front draft arms to be sure they are adjusted equally and not bent. I have not measured the length of the rear arms, but you are right, don't see any other way it could lift unevenly. Will report back with any findings and the results of a few mowings in the upcoming weeks.
KennedyDiesel
Veteran Member
Sorry for dredging up an old post, but I think it better than starting new. I have the same uneven arms on my x750. We actually have 2 of these machines in the family. I haven't checked the second unit, but i assume they are same. Reading this thread it sure sounds like the shaft was incorectly built. Always the same direction can't be coincidence. If its the shaft it shoukd be: AM148019. It sure would be nice to see pictures of the shaft with arms attached and set on a flat surface. I hate to buy the shaft though and find out it was actually the bolt on links not indexed properly.
As for making the selector numbe match teh actual cut height it can be done if you add washers to the adjuster bolts. You may well end up coming to the up stop though
As for the adjuster cam stop my die cast POS collapsed and I replaced it with a steel one off of Ebay.
As for making the selector numbe match teh actual cut height it can be done if you add washers to the adjuster bolts. You may well end up coming to the up stop though
As for the adjuster cam stop my die cast POS collapsed and I replaced it with a steel one off of Ebay.
Timbucktwo
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I added some steel spacers to mine, but that throws the deck off by half an inch in order for me to get it level at the 2.5 inch mark. It works, but it's not without a side effect.
beenthere
Super Star Member
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Welcome to TBN
Don't follow why. Are you saying that the resulting height is just not at 2.5 inch, or my interpretation that you are saying the deck is not level by ½" side to side??
KennedyDiesel
Veteran Member
Spacers under the head of the adjusting screws? I did the same. I think I am going to try the rocker shaft replacement and see what it does. I'm also going to replace my tunnel decal as mine has 2.5" cut at the 12 oclock position. Seems they updated this and 3" is now at the 12 oclock position which is much closer to what it should be.
