Broken front gears ym186d

[Swampfarming]

Today the front end of my ym186D had what i would consider a catastrophic failure.

I had it in 4x4 and it made a noise and i think i have something broken in the front end.

I parked her and removed the front driveshaft to find that if i try to move the tractor the front axle will turn about 1/2 turn and then tires will lock and drag.


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.

I know i need to pull the input shaft and dig deeper but....

I have a line on a ym1510 parts tractor 4x4, could I unbolt my front end and install the front end from the 1510d? Since there aren't brakes and steering is very simple I'm thinking this would work but I haven't seen them side by side.

I was thinking this way i can keep my tractor 4x4 and dummy out my old front end to be 2wd and use the parts tractor as a mule.

Anyways please help !

 

[California]

Today the front end of my ym186D had what i would consider a catastrophic failure.

I had it in 4x4 and it made a noise and i think i have something broken in the front end.

I parked her and removed the front driveshaft to find that if i try to move the tractor the front axle will turn about 1/2 turn and then tires will lock and drag.


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.

I know i need to pull the input shaft and dig deeper but....

I have a line on a ym1510 parts tractor 4x4, could I unbolt my front end and install the front end from the 1510d? Since there aren't brakes and steering is very simple I'm thinking this would work but I haven't seen them side by side.

I was thinking this way i can keep my tractor 4x4 and dummy out my old front end to be 2wd and use the parts tractor as a mule.

Anyways please help !

Ouch!

I know a little about this, likely just enough to mislead you. Hey Roger, Gary, what's the real solution?

I've read that the US YM186D had a different, stronger, front axle compared to the YM1510D that was its ancestor. Maybe a loader-rated axle.

Second, the YM186D parts book shows several different front and rear gear ratios depending on the size of tires available in the various countries where it was sold. So your chance of getting the right ratio in a 1510D > YM186D swap - is at best a 'maybe'.

But from your description there's a slight chance only the smaller differential gears are damaged so swapping internal parts might be sufficient, not the whole axle. If you never find parts then possibly reassemble as a 2x4.

I would start by seeing if any dealer can order OEM parts from Yanmar. Next, tractor junkyards.


Now you have me scared. I leave my YM186D in 4wd because this orchard is all soft ground and the shifter is extremely stiff.

 

[Harry in Ky]

The description sounds to me like the "smaller differential gears" are working fine, but the ring and pinion are more likely the problem. You stated the input shaft seems to be disconnected. Yet the whole assembly locks up when it tries to turn. To me that seems like some teeth have broke loose and are jammed up in the ring gear.

 

[Swampfarming]

The description sounds to me like the "smaller differential gears" are working fine, but the ring and pinion are more likely the problem. You stated the input shaft seems to be disconnected. Yet the whole assembly locks up when it tries to turn. To that seems like some teeth have broke loose and are jammed up in the ring gear.

This seems likely. I can hold the input shaft while I spin the front wheels.
I guess i will have to pull the front axle and disassemble to find out for sure.

 

[Gjamtrac]

This seems likely. I can hold the input shaft while I spin the front wheels.
I guess i will have to pull the front axle and disassemble to find out for sure.

I have attached pics of your YM186D front axle parts.
They may help you in determining the problem.
Sounds to me like Harry in KY may be correct.

 

[bmaverick]

This seems likely. I can hold the input shaft while I spin the front wheels.
I guess i will have to pull the front axle and disassemble to find out for sure.

There are 2 parts manuals available. The original and the updated one in 2009. Should you look for parts from Yanmar, best to use the 2009 edition.

If you find a parts tractor from salvage, then either edition should work.

YANMAR YM186 PARTS MANUAL 0CT10-G22801.pdf

YANMAR YM186 PARTS MANUAL 2009/12 0CT10-G22801.pdf

 

[careyo63]

I'm showing a Ym1610D and a YM1510D have the same Production Yrs. 79-81 15 Eng HP. to 16 Eng. Hp. the only difference. Today on Facebook market a complete Running 1610D is listed. 2000$ Asking

 

[Swampfarming]

There are 2 parts manuals available. The original and the updated one in 2009. Should you look for parts from Yanmar, best to use the 2009 edition.

If you find a parts tractor from salvage, then either edition should work.

YANMAR YM186 PARTS MANUAL 0CT10-G22801.pdf

YANMAR YM186 PARTS MANUAL 2009/12 0CT10-G22801.pdf

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

 

[rScotty]

Now you have me scared. I leave my YM186D in 4wd because this orchard is all soft ground and the shifter is extremely stiff.

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. So...If the shifter is hard to get out of 4wd, then it shouldn't have been in 4wd in the first place. It is telling you that the tires can not slip enough on your ground to reduce the torsional load on the drive train.

I know you've operated yours that way for years, and don't know why yours hasn't broken.
It probably should have by now. Maybe your tires are very worn, or your soil hasn't much clay, or is a real damp mixture ....I don't know. Something is allowing it to slip. But I do know that using 4wd all the time is a good way to break a nice tractor.

If it is hard to shift out of 4wd, all the drive train is being stressed. With enough luck, stressing the drive train that way will eventually break something easily fixed. With even more good luck, that things that break will be the U-joints and splines on the front drive shaft rather than anything inside the front axle.

rScotty

 

[careyo63]

Maybe free. 0.00 marked down from 39.99 YM186 / YM186D YANMAR PARTS MANUAL *DOWNLOAD ONLY*