JD 1640, 2040, 2240 Rockshaft Assembly

[Jimbo1640]

Question on the proper placement of the Cam Follower into the Roller (load selector) Link: Does anyone have a pic or diagram of how it actually mates? We have the Rockshaft Housing top off, and the manual says simply to reinstall in the reverse order of how it was removed. Unfortunately, we don't have that information. The manual only has diagrams of the load control mechanism in the bottom with the cam at the top, and the control valve linkage in the rockshaft housing top, but no information on exactly how the cam positions into the selector link when you place the top back on. All it says is to make sure it mates properly. According to the manual we have, this JD 1640 (and a 2040) have a closed center hydraulic system that is the same as the 2240.
The first image is the Cam Follower sticking up out of the transmission case.
The second image is the rockshaft housing, upside down. You can see the Roller (load selector) Link that the cam is supposed to mate into. Looks a bit like a tuning fork. The load selector is in the lower position.
The third image is of the housing lifted back into position.
The only place I can figure out that the Cam will fit is on the end. Is this correct?



Btw--The reason we were working on this in the first place was no down pressure on the 3ph, for example, a backblade would just skid along the ground. I found a sprung spring in the rockshaft housing, and the negative stop screw as seized and useless. Have replace both, don't know if that will solve the problem, but I need to reassemble this correctly to find out.
Thanks. Cheers.

 

[Tx Jim]

You have the cam started correctly in the lever but the bulge(knot) on the cam needs to be above the lever(parts key 4) so lever can be adjusted up/down for L,LD & D or max to min depending on tractor model.

 

[buickanddeere]

Still won't be any down pressure. Just the weight of the arms and implement.

 

[Jimbo1640]

Tx Jim- Thanks so much, that was the piece of information I was looking for. That all makes sense now that I think about it. Will give it a shot. Also, thanks for explaining the L, LD & D to Max to Min. That was what I had figured, but our manual from Jensales lists L, LD, & D and our tractor is Max to Min. I was always a little puzzled over that. Cheers.

 

[Jimbo1640]

buickanddeere--Yes, but something is out. All I can do is reassemble, adjust, and see what happens. The issue of no downpressure may be related to another issue, possibly with the load control not responding. All I know is it was responding nicely with a back blade, and then it wasn't. Will know more after I get it back in order. Thanks.

 

[Tx Jim]

Jimbo1640
I'll 2nd what b&d stated. No matter what you do to hyd system there will be no down pressure on 3 pt besides the weight of the 3 pt hitch,implement attached to 3 pt PLUS any added weight. You could get a Belarus and as some models will have down pressure on 3 pt. Very few ag tractors have down pressure on 3 pt hitch.

 

[Jimbo1640]

Tx Jim & b&d-- Ok, I will accept that. "There is no such thing as downpressure", at least not on this tractor. Someone else has been telling me that too. I think the word "load response" would be more accurate, related to the selector lever, which might make sense if the cam was in the wrong place on the load selector link and the spring was sprung up inside the rockshaft housing to boot. I'm just guessing at that, but will reassemble and see what happens.

 

[texasag84]

I realize this is a 2 year old thread but it is exactly what I was looking for. except I am not clear on where exactly the cam follower is supposed to seat. The lever looks like a tuning fork with a small roller toward the open end of the fork and a slide hole about 2 inches forward that the lever slides on. Does the cam follower go at the end of the open end of the lever or between the roller and the slide opening? Also, how do you lower the rockshaft cover so that the cam follower perfectly seats in the proper place on the lever? I am going to use Permatex Anaerobic Gasket sealer so I need to be able to lower the housing carefully and precisely without messing up the Permatex bead.

 

[Tx Jim]

Welcome to TBN
Looking at the tractor from the rear the cam follower fits on the back side of roller. You should replace quad ring(T17882) located at RH frt side of top of trans case. This quad ring seals oil galley from frt pump to RS housing. I'm curios why you would choose not to utilize correct gasket for mounting RS housing?
T21641 Gasket - GASKET ADD 16.02 USD
T17882 Washer - RING,SEALING ADD 1.57 USD

 

[texasag84]

Welcome to TBN
Looking at the tractor from the rear the cam follower fits on the back side of roller. You should replace quad ring(T17882) located at RH frt side of top of trans case. This quad ring seals oil galley from frt pump to RS housing. I'm curios why you would choose not to utilize correct gasket for mounting RS housing?
T21641 Gasket - GASKET ADD 16.02 USD
T17882 Washer - RING,SEALING ADD 1.57 USD

Was told JD doesn't make that gasket anymore. Did a search online for the part number and looks like there are multiple suppliers. Thanks for the part number and recommendation on replacing the quad ring. Any additional things I should do before reassembly?