155D Replace front wheel seal

[PAFrank]

I have an oil leak on the inside of my front right wheel on my Yanmar 155D that I am trying to fix. In the parts manual item # 22 -69 part # 1A1040-28810 (oil seal) or #21 - 45 part # 194210-13940 (front gear case packing) seem to be the likely problem. I removed the wheel and tire and the axle and cover. I removed the snap ring #22 - 54 that was installed between the two bearings per the Shop Manual instructions on page 7. I think I need to remove the bearings next to get to the oil seal. Do I need a bearing seperator tool to do this? Do I remove one bearing at a time or try to pull several items off of that axle?
My tractor had a gasket like material called fiberhide where the parts manual shows #21-45. I am carefully scraping that off of both surfaces it coupled. Can I make my own gasket for this? If so, what type of gasket material?
I am attaching some pictures.
Again this tractor is teaching me things any mechanic should know. Unfortunately I was an electronics guy so the mechanical stuff is new to me. I appreciate any help you veteran tractor mechanics can share!
Thanks
Frank

 

[winston-HT]

The bearings will have to come off. Once the snap ring is removed you should be able to press the shaft and outer flange out of this item (gear case cap) https://www.tractorpartsasap.com/front-axle-seal-case-new-yanmar-194210-13930-181183.html
The seal goes in the gear case cap.

 

[PAFrank]

Thanks Winston. I'm going to buy a bearing seperator tool and give this a try.

 

[winston-HT]

You might try a hard rubber mallet or piece of hardwood to drive the shaft thru bearings and out. The bearings shouldn't be that tight on the shaft. Just make sure the snap ring is out of the groove. Your could even try prying between to two flanges with a pry tool on both sides.

 

[PAFrank]

Winston. Back in the Hoye Tractor days there used to be a series of articles on how to perform many tasks, like for instance, bleeding the air out of the fuel line when you replaced the fuel filter. I had several videos that Aaron had put together also. Did any of that survive?
Thasnks.
Frank

 

[winston-HT]

Yess. Look on this page. https://yanmar-tractor-owners.groups.io/g/main/wiki/19568

 

[bmaverick]

Winston. Back in the Hoye Tractor days there used to be a series of articles on how to perform many tasks, like for instance, bleeding the air out of the fuel line when you replaced the fuel filter. I had several videos that Aaron had put together also. Did any of that survive?
Thasnks.
Frank

Yes, it did survive in the WayBackMachine or Archive.org site.

Winston's link can only be seen if you login to the YTOG.

Here are the direct links should you need it. Do BOOKMARK them.

I've been a supporter of this site for many years and my brother had helped save countless of Yahoo Groups to this service too.

HOYE TECH ARTICLES
https://web.archive.org/web/20230926081645/https://www.hoyetractor.com/TechCenter.htm

HOYE KNOWLEDGE BASE
https://web.archive.org/web/20230926093034/https://www.hoyetractor.com/support/knowledgebase.php

Allow time to load these pages as the bandwidth for the site is slow.

 

[PAFrank]

OK guys. I have the new seal installed and have the two bearings back on the axle with the snap ring and spacers exactly as they were when I removed this axle stub assembly. I have a new fiber type gasket and I am ready to insert the axle assembly onto # 35 on the page 63 diagram above. The crown gear #72 on diagram page 69 is not stationary for me to get the spindle #31-26 on diagram page 69 end into it. It is moving around inside # 35 cavity on diagram page 63. None of my maintenance or parts manuals have any details about how to get this spindle inserted into the center of that crown gear. Any ideas? My thinking is to remove the nut on top of assembly shown in the attached picture and then remove the bottom plate #39 on diagram page 63 and drop that whole assemble down so I can get my fingers up into that cavity to hold the crown gear when I insert the spindle/axle/bearing assembly in the second picture attached.
I appreciate any ideas or input that you have.
Thanks.
Frank

 

[winston-HT]

You may have already looked at the manual. Not a lot on the 4 wheel drive but there is some. I am assuming you probably have some shims that go on the stub axle that will go on right before the gear. https://www.tractorforum.com/threads/yanmar-ym135-ym155-service-manual.51613/

 

[PAFrank]

Winston - There were no shims but there was a spacer between the inner most bearing and the crown gear. It is not shown in the picture above. It covers almost 1/2 inch of the splines.
Thanks.
Frank

 

[winston-HT]

That spacer is what sets the backlash on your gears. you want to make sure you do have a small amount of backlash. I don't think it is rocket science but you don't want the gears to be binding or enormous backlash.

 

[PAFrank]

OK. The axle assembly has been reinstalled after the new seal was installed and the bearings reinstalled with the clips and spacers. The problem was that the crown gear that the spindle fit into the inside of was moving around in the next cavity and the bearings are very snug fitting into their adjacent cavity. The solution was to open the drain plug on the crown gear cavity, position the crown gear to mesh with its mate above it using a finger where the spindle would go and hold the crown gear in place with a piece of heavy wire up through the drain hole and then gently as possible insert the axle and bearing assembly. It took two guys but the job is done. Here is what it looks like now (attached). I need to refill the front axle oil and check for any leaks and put the tire back on.
Again, I can't tell you how much I appreciate the shared wisdom offered on this forum!
Thanks.
Frank

 

[bmaverick]

Frank, glad it's all back together. Good write up too. All in time for winter snow to arrive in a month or two.