4wd Front Axle/ Steering Issue - 1401D

Post your questions or problems you are haviing with your Yanmar tractor here.

Moderator: Aaron

1938Case
Volunteer Poster
Posts: 2
Joined: Fri Nov 13, 2020 12:05 pm
Location: Southern Minnesota

4wd Front Axle/ Steering Issue - 1401D

Postby 1938Case » Fri Nov 13, 2020 2:05 pm

I bought a YM1401d last week (with Koyker 80 loader and Yanmar tiller). It is difficult to steer going forwards and almost impossible to steer when backing up. Zerks take grease and steering is decently tight. Axle has oil at the shaft level and looks normal (not milky). It looks to me like the housing that rotates at the wheel is rubbing (tipped out) on the wheel side as though the bearings are out (along the king pin). I have not taken it apart yet, but plan on it this winter. Do I just replace all the bearings and seals (vertical and horizontal) while I'm in there?

I've been going through this <https://www.hoyetractor.com/CTGY/14014WDEXTERNAL.htm> diagram looking at all the bearings, bushings, seals, etc. Lots of stuff packed into a small space!
Thanks,
Paul
Attachments
IMG_4761.JPG
IMG_4761.JPG (100.88 KiB) Viewed 1269 times
IMG_4762.JPG
IMG_4762.JPG (105.45 KiB) Viewed 1269 times
Last edited by 1938Case on Mon Feb 08, 2021 5:56 pm, edited 1 time in total.

winston
Volunteer Poster
Posts: 5774
Joined: Mon Feb 01, 2010 7:29 am
Location: North East Texas

Re: 4wd Front Axle/ Steering Issue

Postby winston » Sat Nov 14, 2020 3:42 pm

I would recommend taking it apart for inspection, then order parts needed.

1938Case
Volunteer Poster
Posts: 2
Joined: Fri Nov 13, 2020 12:05 pm
Location: Southern Minnesota

Re: 4wd Front Axle/ Steering Issue

Postby 1938Case » Mon Feb 08, 2021 3:43 pm

So I just got done taking apart and rebuilding. (part numbers for reference: https://www.hoyetractor.com/CTGY/14014WDEXTERNAL.htm)
Replaced: large seal 38, bearings 54 & 57, and upper seal 56. I made a few 'improvements' to the design after studying the load path. The upper bearing #54 is where the vertical load is transferred from lower housing into the upper housing via thrust load thru the bearing. Deep groove ball bearings are not rated for thrust load (only radial) so I replace with a same size angular contact ball bearing (7205: 10,000-lb combined static load capacity). Also, that bearing is above the level of case oil so I drilled and tapped a grease zerk into the housing filling the space around the spacer. The lower ball bearing I left sealed on the top to keep the grease and oil separate (bottom seal removed and exposed to case oil). I also put a couple of small holes in the upper seal to relieve pressure from the new greased area (if kept greased, should keep water out). Wheels re-aligned for slight toe in. I can upload progress pictures and elaborate further if anyone is interested.

It does steer a little better, but the bottom housing is still tipping out and it's still hard to steer even with an empty bucket. It looks to me like the pin is probably undersized and just deflecting that much under load. Maybe I need to custom fab a bracket to connect the lower housing to the upper part of the pin to create a double shear condition? That's what the later models and JD's have. This model just isn't meant for a loader I guess... Works will without the loader. FYI, the 135d and 155d (late models) have the same style axles which helped enormously for disassembly/ assembly and parts. Anybody else have this issue (1401d, 135d or 155d)?

winston
Volunteer Poster
Posts: 5774
Joined: Mon Feb 01, 2010 7:29 am
Location: North East Texas

Re: 4wd Front Axle/ Steering Issue

Postby winston » Mon Feb 08, 2021 5:57 pm

Very interesting. I opted to use a sealed bearing on top because of the bearing above oil level. Don't know why you still have tilting out. Something just doesn't sound right about that but I have no answer.


Return to “Tech Support”

Who is online

Users browsing this forum: Bing [Bot], Google [Bot] and 34 guests