4wd not engaging - ym1510d

[YanmarMatt]

I have a Yanmar YM1510 D. This thing is awesome! I’ve had it for just a little under a year and have used it for all sorts of different things despite the front wheel assist not engaging. The shifter you use to engage the four-wheel-drive moves freely and I don’t feel it ever engage. In reading other posts on this forum it sounds like that is likely one of the pins has sheared off. Two questions I have:

1) does that sound like the likely issue?

2) In order to replace it do I have to split the tractor? If so, see my picture. Would I just split it right behind where the four-wheel-drive shifter is? Or would I split it a foot and a half further up where the clutch is (I included a picture of this spot also for reference)? I watched a hoye tractor video of them splitting a tractor to replace a clutch.

 

[winston1]

If I were going to split I would splitwhere clutch housing bolts to motor. May have to go further, but that would be my starting point. I guess you have this drawing. 4WD_SHIFTER: Yanmar Tractor Parts

 

[YanmarMatt]

If I were going to split I would splitwhere clutch housing bolts to motor. May have to go further, but that would be my starting point. I guess you have this drawing. 4WD_SHIFTER: Yanmar Tractor Parts

Thanks for the response. Do you suggest splitting there due to familiarity? Or why do you suggest that?

 

[winston1]

Just seems to be the normal place to split a tractor. Here is a video of a 1510 split by Aaron of Hoye tractor. Might help you if you determine that is your course of action. Yanmar Tractor Brake repair Video

 

[California]

I've never studied this issue but I expect the problem is down where the shift lever moves a collar or something, and this may be accessible under the tractor without taking apart anything else.

I'll be interested to read what you find. Mine (YM186D) is stiff to shift and I worry something will eventually break.

 

[winston1]

Here is the drawing for the 186, very similar to the 1510. Not sure either of these is going to have easy access to get to that linkage.

 

[Menagerie-Manor]

I have a Yanmar YM1510 D. This thing is awesome! I’ve had it for just a little under a year and have used it for all sorts of different things despite the front wheel assist not engaging. The shifter you use to engage the four-wheel-drive moves freely and I don’t feel it ever engage. In reading other posts on this forum it sounds like that is likely one of the pins has sheared off. Two questions I have:

1) does that sound like the likely issue?

2) In order to replace it do I have to split the tractor? If so, see my picture. Would I just split it right behind where the four-wheel-drive shifter is? Or would I split it a foot and a half further up where the clutch is (I included a picture of this spot also for reference)? I watched a hoye tractor video of them splitting a tractor to replace a clutch.

Have you visually confirmed the shaft is rotating with the lever.

 

[YanmarMatt]

Have you visually confirmed the shaft is rotating with the lever.

I got underneath the tractor and could see the linkage is moving with the lever. You have to look through the drivetrain and everything. I’m not sure yet if I’ll be able to access it without splitting it or not. I’ll try to video it when I do it so I can share it.

 

[YanmarMatt]

I've never studied this issue but I expect the problem is down where the shift lever moves a collar or something, and this may be accessible under the tractor without taking apart anything else.

I'll be interested to read what you find. Mine (YM186D) is stiff to shift and I worry something will eventually break.

Good idea. I got under to look at it. It looks like I might be able to access it from underneath. I’ll have to remove some things, but that hopefully would be easier than splitting it. I’ll try to video when I do it so I can share.

 

[Gjamtrac]

Good idea. I got under to look at it. It looks like I might be able to access it from underneath. I’ll have to remove some things, but that hopefully would be easier than splitting it. I’ll try to video when I do it so I can share.

On the YM186D you can replace the four wheel drive shifter without splitting the tractor.
In the picture that winston1 posted, you can see the large nut #3, unscrew it and the shift linkage all comes out except the block #10, which is on the shaft #8.

 

[California]

On the YM186D you can replace the four wheel drive shifter without splitting the tractor.
In the picture that winston1 posted, you can see the large nut #3, unscrew it and the shift linkage all comes out except the block #10, which is on the shaft #8.

Thank you for posting that description! Repairing it sounds reasonably simple.

I vaguely remember a post long ago where he repaired the inner tip attached to that horizontal shift rod, or something like that, and he had accessed it from beneath the tractor.

You need to drain the transmission before taking that rod out, no?


Hope I never break that.

 

[winston1]

Alrighty then. The nut on the 1510 and 186 is the same (194301-22860) so all should come out on the 1510 if it will come out on the 186.

 

[YanmarMatt]

So I’m trying to take off that nut as suggested. Can’t get a wrench in there in it. So I pulled the spring pin to pull the lever off, then I was going to put a socket on that nut and take it off. I can’t get that lever off. Any suggestions?

So far I’ve tried:
- grabbing and pulling with pliers
-sprayed with liquid wrench
- heated up with propane torch and pulled

My next though was to cut off the lever short enough that I could get the socket on the nut then I’d either buy a new lever or weld the lever back on. Thanks for everyone’s input so far.

 

[ponytug]

So I’m trying to take off that nut as suggested. Can’t get a wrench in there in it. So I pulled the spring pin to pull the lever off, then I was going to put a socket on that nut and take it off. I can’t get that lever off. Any suggestions?

So far I’ve tried:
- grabbing and pulling with pliers
-sprayed with liquid wrench
- heated up with propane torch and pulled

My next though was to cut off the lever short enough that I could get the socket on the nut then I’d either buy a new lever or weld the lever back on. Thanks for everyone’s input so far.

High heat and penetrating fluid, or candle wax. You might try tapping it when it is warm and you have the penetrating fluid on. MAPP gas if you have it. You want it to get hot as fast as possible.

Do you have a gear puller that would fit?

I wouldn't worry about the nut until you have the lever off.

All the best,

Peter

 

[YanmarMatt]

I rented a puller from o’reillys, but it’s too big. There isn’t really much to grab onto either, unless I could get something to go in those two holes where the spring pin was. If anyone knows where I could get one that small I’m all ears. From what I could see at Harbor freight i didn’t think there was one that would work for me.

Agreed on not worrying about the nut until the lever is off.

 

[winston1]

What about this Bearing Separator or this Tie Rod Separator Set, 5 Piece

 

[ponytug]

Personally, I would try candle wax, PB Blaster, more heat. Sometimes time is your best friend.

Do you have a needle scaler or impact hammer that you could use to apply a little vibration to it?

I would be reluctant to apply much force to the lever itself for fear of damaging items inside...

All the best,

Peter

 

[California]

I think using a tie rod separator or bearing separator would apply too much force to the bushing at the inner side of the nut if the lever is severely stuck. Could you install that just snug, then pull on it with the gear puller?

I agree, best would be heat combined with penetrating oil/candlewax, and vibration. And time - overnight? - to let the heated penetrant migrate in.

Cutting the rod off to get a socket in there is an alternative too. It shouldn't be difficult to weld that back together after its off. Maybe take it to a pro, if needed.

If nothing works - I had an idea: Thread short bolts into each side of the hole, if you can find some that are a snug fit. Bolts so short they can't reach the rod. Secure each with a locknut. Then use a two-jaw gear puller.

Or - Cut a notch in a big socket to get it past the lever. Maybe reinforce it with a hose clamp? From Ebay, or if you have a used tool store nearby, a single socket shouldn't cost too much. I have a store like that near my home that will barter my unused extra stuff for something I need, at about 1:4 value ratio. I don't remember what I took in but my 18" socket-set extension came from there, for example. I've bought a couple of other things there to modify for one-time use.

 

[YanmarMatt]

Had a friend come over and he put a long pry bar in there and wiggled it off in less than 3 minutes. It was slightly disappointing to me how easily he got it.

Got the broken pin out and I’ll see if hoye has any used ones otherwise I think we might be able to weld it back together. We pushed the lever inside with a screwdriver and jacked all the wheels up to confirm the four wheel drive is now working. So glad I didn’t split it apart like my initial thought was to do. Should be pretty easy from here. Thanks everyone for your input.