Broken front gears ym186d

[rScotty]

The input shaft to the front axle seems to be disconnected from the differential.

When i lifted the front end off the ground i could spin as much as i wanted as long as the other wheel was turning the opposite direction, but when you try to turn them the same direction it locks up almost immediately.

Anyways please help !

That's normal for any differential. That is how they work.

 

[California]

California, we've discussed this a lot. Yanmars are designed as a 2wd with part time 4wd assist only when needed. Yanmars DO NOT have the center drive shaft differential that is required for full time all wheel drive.

rScotty

Thanks for the comments. This shifter is stiff, not due to binding but rather due to the shifter itself being stiff. With the front axle off the ground (loader bucket turned down then forced down) it takes enough force that I fear breaking the shift linkage, as I have seen others post here. I use 2wd where it's sufficient and when I go out on the un-paved easement.

The entire apple orchard gets disced so its so lumpy that you risk a twisted ankle walking around. And most everywhere is sloped. My experience is steering doesn't pull the nose around in 2wd, one brake is often needed to change direction in 2wd.

The first YM186D - without loader - that I had for a couple of years had the wrong, oversize, front tires and the spline on the input shaft (pinion) as well as the front driveline U-joint were damaged, as you predicted. No damage to the axle internals.

Before putting that tractor in service I bought the U-joint (rare, Honda ATV axle for just a couple of years) and had a machine shop drill and add two set screws. And got the right tires.


6.00 x 12 (the taller tire) and a 6-12 (the size Yanmar specifies for YM186D).

Typical use.

Anyhow - yes as everyone pointed out Swampfarming's observation sounds like a broken, jammed ring gear. And the issue now is how to find parts to repair it.

 

[Swampfarming]

That's normal for any differential. That is how they work.

Thanks for the comments. This shifter is stiff, not due to binding but rather due to the shifter itself being stiff. With the front axle off the ground (loader bucket turned down then forced down) it takes enough force that I fear breaking the shift linkage, as I have seen others post here. I use 2wd where it's sufficient and when I go out on the un-paved easement.

The entire apple orchard gets disced so its so lumpy that you risk a twisted ankle walking around. And most everywhere is sloped. My experience is steering doesn't pull the nose around in 2wd, one brake is often needed to change direction in 2wd.

The first YM186D - without loader - that I had for a couple of years had the wrong, oversize, front tires and the spline on the input shaft (pinion) as well as the front driveline U-joint were damaged, as you predicted. No damage to the axle internals.

Before putting that tractor in service I bought the U-joint (rare, Honda ATV axle for just a couple of years) and had a machine shop drill and add two set screws. And got the right tires.


6.00 x 12 (the taller tire) and a 6-12 (the size Yanmar specifies for YM186D).

Typical use.

Anyhow - yes as everyone pointed out Swampfarming's observation sounds like a broken, jammed ring gear. And the issue now is how to find parts to repair it.

Nailed it yes broken pinion and ring

 

[rScotty]

Thanks for the comments. This shifter is stiff, not due to binding but rather due to the shifter itself being stiff. With the front axle off the ground (loader bucket turned down then forced down) it takes enough force that I fear breaking the shift linkage, as I have seen others post here. I use 2wd where it's sufficient and when I go out on the un-paved easement.

The entire apple orchard gets disced so its so lumpy that you risk a twisted ankle walking around. And most everywhere is sloped. My experience is steering doesn't pull the nose around in 2wd, one brake is often needed to change direction in 2wd.

The first YM186D - without loader - that I had for a couple of years had the wrong, oversize, front tires and the spline on the input shaft (pinion) as well as the front driveline U-joint were damaged, as you predicted. No damage to the axle internals.

Before putting that tractor in service I bought the U-joint (rare, Honda ATV axle for just a couple of years) and had a machine shop drill and add two set screws. And got the right tires.


6.00 x 12 (the taller tire) and a 6-12 (the size Yanmar specifies for YM186D).

Typical use.

Anyhow - yes as everyone pointed out Swampfarming's observation sounds like a broken, jammed ring gear. And the issue now is how to find parts to repair it.

Good to hear. That's what I thought you had done, and I was surprised to hear that your 4wd shifter was stiff. Anyway, I'm glad that it is just stiff for some other reason, and not a result of four wheel driving.

As you say, lifting the front axle with the loader proves that it is not due to drivetrain windup.
I know you depend on that tractor a lot, and am amazed at the work it has done over the years.

BTW, I did end up doing some apple tree grafting this year. The donor is a roadside wild apple tree with unusually nice flavorful apples - A tree known to local people and the local bear populaition too. It's a dependably good producer on about a every other year cycle.

So last spring I cut some budded twigs from that tree and grafted them onto some of the non-productive mature wild apples on our place. To my surprise, all of the grafts took, grew, and leafed out. It's my first try, so grafting must be easier than I thought. I know it's not me, because I tried several different grafting techniques and they all worked.

Next step will be to see if those branches produce apples a few years from now.
rScotty

 

[bmaverick]

Does anyone have either of these parts manuals available currently? Or that I could download?

They are free on the YTOG