ym155d front wheel wobbles

[vern748]

Hi

I have a ym155d and the front left wheel wobbles. The seal is leaking and I am going to replace the seal. Before I tear into it, I wanted to be ready for what else needs to be replaced. Attempting to minimize my down time. So what would cause the wheel to wobble ?

When it is in 2wd its more pronounced then when in 4wd. The steering rack is a bit loose, but its more than that.
Has anyone come across this before?

Vern

 

[clemsonfor]

bad bearings! But your going to have to tear into it and see the extent of the damage/worn components.

 

[winston1]

4WD_INTERNAL: Yanmar Tractor Parts

 

[HoyeTractor]

There are several things in there that could cause a wobble. It could be something as simple as the nut on the stub axle just came loose. One thing is for sure though- the more it is driven with the wobble the more it is going to cost to fix it. If those gears get out of alignment in there or it damages a shaft it can get expensive in a hurry. A $5 bearing can turn into several hundred dollars pretty quickly.

 

[chevy791979]

If needed, I have a parts manual I could take a picture of. Let me know

 

[vern748]

HI,

Thanks for the assistance. Have some parts on order just to be ready as I start work on it. Will let you know what I find.

 

[vern748]

Starting to work on the wheel. Starting to take it apart but not coming lose as I think it should. Just in case, its a serial # above 53000xx. I have manual but its pretty light on how it should come apart. Any hints are most helpful.

 

[winston1]

Never been there, done that on your model. Just looking at the parts drawings it would seem if you take the 4 bolts out holding the stub axle that it should come out. It appears there is no retainer on the stub axle gear and that it should slide off the stub axle. Whether that is true I know not. No doubt there will be some friction from the bearing coming out of the housing or off the shaft, which ever happens first. I wouldn't doubt that you end up taking the kingpin shaft out.

 

[vern748]

I was able to get out the stub axle with a bit of tinkering. The bearings are pretty tight but do come out. There is a problem reinserting the axle back, since the ring gear drops and is still within the knuckle. Will either need to remove the knuckle or the entire unit.
Not a pretty picture, but the axle seal is chewed up. Everything else is good.

 

[winston1]

"There is a problem reinserting the axle back, since the ring gear drops and is still within the knuckle. Will either need to remove the knuckle or the entire unit."

Again, haven't done it on your model but drawing would indicate dropping the lower knuckle should be pretty straight forward. Looks to be well worth it to change the knuckle seal and upper kin pin shaft seal while apart.

 

[vern748]

Hi All,

I had been working on the right side wheel since I needed to fix this leak and see what a "good" wheel looks like. I was concerned over the wobbly left side wheel and wasn't sure what I would find. Took out the stub axle and all looked good. Even had newer sealed bearings. Since once the stub axle is out, you need to pull the knuckle to install the spacer and ring gear back into the unit. As i'm pulling off the knuckle, a wood drift key falls out ? !!! Look again into the wobble and its just the missing key that was the problem. ??!!!!:thumbdown: The king pin was turning in the pitman arm.

I really hate cleaning up other peoples messes. My bad for not looking at it closer.

Need to order the seal from Hoye and then i'm done. Expensive repair avoided.

 

[Jtullis13]

Glad you found the problem Vern. I haven't had to do this yet, but this will definitely help me when I do need to