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John Deere Tractors Discussion Forum
Show Parts for Model:

2840 Rockshaft linkage fulcrum

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Bob Angus

08-11-2014 15:53:10
67.214.29.16



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Hi, I have a 2840. Just resealed rockshaft cylinder. Seems to work well but I am having trouble getting any adjustment from the screw under the plug by the control shaft input. 1/4 turn clockwise is supposed to get me 4mm. I can't see a difference and I have gone a couple turns. I don't want to back the screw out in there. The only things I can think of are that the adjustment plate is worn or that I have the eccentric fulcrum(held by spring pin) in backwards. It only goes two ways. With the control arm parallel to the rockshaft housing line, the thick part is pointing down. That's the way I have it, and the way was it was but someone may have had it out before. Does anyone know how this goes? Thanks
Bob

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Tx Jim

08-11-2014 16:12:30
69.35.160.116



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 Re: 2840 Rockshaft linkage fulcrum in reply to Bob Angus, 08-11-2014 15:53:10  
Does this parts photo help?



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Bob Angus

08-11-2014 16:37:04
67.214.29.16



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 Re: 2840 Rockshaft linkage fulcrum in reply to Tx Jim, 08-11-2014 16:12:30  
The part I am speaking of is AT19840. It is part of the rockshaft cylinder linkage. I think it only goes in one way but I've been wrong before. I just cant seem to be able to adjust(specifically increase) the control lever neutral range. I have the manual but both it and the parts diagrams arent really clear. I certainly don't want to back the "special adjustment screw" T22228 out in there. To my knowledge it is together properly..ie load control arm in slot and on cam.

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Tx Jim

08-12-2014 03:30:25
69.35.163.57



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 Re: 2840 Rockshaft linkage fulcrum in reply to Bob Angus, 08-11-2014 16:37:04  
I think the cam(parts key 7) must stuck on the lever(parts key 6) as when adjusting valve clearance one doesn't need to turn screw(parts key 8) much to get a lot of clearance. From your description I think you have the fulcrum installed correctly. Is spring(parts key 9) attached correctly??



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Bob Angus

08-12-2014 18:06:39
67.214.29.16



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 Re: 2840 Rockshaft linkage fulcrum in reply to Tx Jim, 08-12-2014 03:30:25  
Tx Jim. Maybe the cam is stuck. I get very little increase in neutral range by going 2 turns. However, fully tight(full counterclockwise) the valves are spraying. They stopped after turning out clockwise, so it must be doing something. I cant seem to get the 2-4mm free play spec on the lever. I got maybe 1mm., and I don't want to go more than 2 turns because I am paranoid about the screw backing out, and seems like that's about all the adjustment its got. Does this sound normal? If stuck so any ideas on how to free this up through the plug adjustment hole.Should I be worried about this or is this close enough?

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Tx Jim

08-13-2014 03:11:37
69.35.160.115



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 Re: 2840 Rockshaft linkage fulcrum in reply to Bob Angus, 08-12-2014 18:06:39  
I think if spraying of the oil stops then you should be fine. Only good way to check linkage is to remove RS housing from tractor.



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Bob Angus

08-12-2014 06:53:39
67.214.29.16



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 Re: 2840 Rockshaft linkage fulcrum in reply to Tx Jim, 08-12-2014 03:30:25  
That's a good thought. Like I said, I am pretty sure I have the fulcrum right as it doesn't fit the other way. Spring is definitely attached. I'll get a screwdriver in there today to try to see if it is free. Thanks Tx Jim.



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