Yanmar 1500 shifter spring broke, need help with rollpins in case

[Yanmar4theKUkid]

Howdy folks, first ever post on the site and hope for some tech help to save the day, particularly mine! I have a Yanmar 1500 and noticed the shifter getting sloppy and moving up and down. I have the one piece shifter case so I had to take it loose and pull the entire shift cover case (w/ 4 bolts) to inspect. I noticed the shift spring is broke in half with a little bit left between the washer and ball and the rest in the case on top of the shifter plate. There must have been a couple of types made because when I resourced Hoyes to see it they only showed the two piece case with a different looking shift plate. My shifter plate is keyed to a dowel pin on the case and has a washer with cotter holding it in place and it pivots on the dowel pin when the shifter is moved left to right, or vice versa as respective. The broken spring is under the plate (looking from bottom up) and I don't comprehend how this springs rest is assigned, etc. It can't rest on the shift plate as it is now does it? I would think moving the plate back and forth through means of moving left and right through neutral positions would be detrimental to the springs operation and integrity. Does the whole spring mount on the shift rod above the washer which rests above the clip? If that is the case can I just cut the broke spring out from between the case and shift plate or do I need to pull all the shift fork rods out and pull the plate out, remove broken spring and start fresh from there? If so how do those roll-pins come out? There is only a hole on one side so you don't drive them through to get them out. You must have to turn the shaft to raise them if the shaft is machined in same way to do such, otherwise you drill them out and start over which seems a little dangerous because we all realize the opportunity to wallow (or hog) the bore out bigger than the roll-pin can account for. Any help, advise, instruction or other is greatly appreciated and I thank you in advance!

 

[winston1]

They show the old and new styles here but no breakdown of different parts for the old style. Yanmar Tractor Parts: TRANMSISSION_CASE_G I have a 1500 parts manual and it only shows the new style. Is your tractor green?

You have done an excellent job with your descriptions but my age and mentality keeps me from putting it all together. Would any pictures be possible?

Not saying this is what you need to do but I have had success in pulling roll pins with vice grips.

Welcome to the forum. :welcome:

 

[Yanmar4theKUkid]

Thank you for the resource winston1, I'll check that out immediately following my response here. No sir, my tractor is red but oddly enough I had someone else ask me the same thing when I described the unified shift cover case to them. I've only had the tractor about three years so I suppose anything is possible such as a paint swap, trans cover swap (I imagine they would interchange) from another older green tractor, etc. I got the tractor out of Denton, Tx. and was told there is somewhere close that refurbishes them down there and according to the new paint on everything, tires, ect. and a bar scanner sticker on the fender I suspect it was given the once-over at some point so they may have swapped a part or two if needed. As for the roll-pins; they are in the pin hole about 1/4 inch or so and I am not sure how to get to them to pull them. I guess there are plugs on the outside of the case on one end of the shift fork rods, I'm guessing the side with the roll-pins so I may resource a bit more and see if they come out, which might give me the view and an obvious answer that would make me feel like a cat in a litter box ashamed of asking others what I am supposed to do while I'm in the box. Anyway, I'll try to figure out how to post a couple of pictures to make it easier to see what I have and what I need to do to get those roll-pins out and shafts out to fix the issue. Thanks ya kindly for the help, I sure do appreciate it.

 

[winston1]

Probably won't help but here is a thread on another forum that seems similar. http://www.mytractorforum.com/showthread.php?t=259490

 

[PILOON]

Different tractor but similar problem.
I drove the pin out with a pin punch and caught the pieces with a magnet.
To install the replacement roll pin I drilled the end of a 3/8 bolt to hold the new roll pin and tapped the pin into the shaft hole.

Tricky, but it did the job.
This was for my 2/4 wheel shifter and thru the small shifter cover that held the shift lever onto the tunnel.
To make the task harder that pin was offset from the access so I needed to shape the bolt into an 'S' for alignment.
(and it was terribly cold so could not feel small items)

 

[Yanmar4theKUkid]

Winston that other forum piece you sent me makes all the sense in the world. Those roll-pins don't come out they get driven down inside the shaft, then the shaft is pressed (or punched out) and you remove the roll-pins from the shaft while it is out of the case, them re-install them back through the hole in the case where I thought they would be coming out of. I can do this if I need to now, but if that spring doesn't rest on the shift plate there is no reason I would need to go into the bottom, I could just cut that broken piece of the spring out that is between the case shift hole and the shifter plate to get it out. My biggest issue now is figuring out if that spring truly rests on that shift plate. I still don't think it is a good place to rest with that plate moving back and forth as you move side-to-side with the shifter the spring will be trying to move side to side with the plate, maybe that's why the spring is broke now and many other's tractor spring has broken as well. Shall we call that an inherent issue for this tractor? Anyway, if it does rest on that plate then I will have to pull all the rods and shift forks, etc. out to get there but thanks to you I now have some knowledge on how this critter comes apart. Thanks a million and I must say you are like a hound dog on the hunt, very resourceful and un-relentless to help your tractor friends of the community. Sometimes it's hard to fathom the idea of how much a little something means to someone on the computer, but if I was there I would shake your hand and look you in the eye and tell you thank you sir, I appreciate all your help! Gods speed, there are a lot of people to help before we go my friend.

 

[kenmac]

Winston has helped many here. By finding articles, drawings, etc, He has also personally helped a member by repairing his tractor. Winston is someone I'd like to live next or close to.:thumbsup: