76 YM155D steering box exploded

[Sspiderman]

My 76 YM 155D has blown the bearings out of the steering worm gear AGAIN!
I either need to get a new steering column shaft w/gear block or figure out how to rebuild mine properly.

Last winter, I ordered Hoye’s parts, but they were the wrong length/dia, so I tried to straighten the tubes and put it all back correctly, but it let go after only a few hours of use.
Are there any used parts suppliers you folks have dealt with I could get a column or full steering box assy from or possibly a unit from another model/manufacturer that would fit close?
Or do you have any options for getting it rebuilt or new parts manufactured?

 

[California]

Maybe not very helpful but ...

When I rebuilt the steering box on my first YM186D I found the box was from a recognized third party. And, the box casting and likely the bearings, also appeared for Datsun 240. (But the steering shaft and tube would be unique to each application).

I don't recall now the name I found, but I recognized it, it also appeared on some American cars' steering gear. Maybe Saginaw??? Not likely, but I see there are rebuild kits for those.

Possibly your box is in common with many Japanese cars and the parts are out there, if dealing with Yanmar-specific vendors is a dead end.

 

[careyo63]

What I found interesting is Bearings at Fredricks # SB-750 2 per column
155 W/19mm shaft.
The only other size shaft I see is for the YM 1100,1300 15.5mm shaft.

 

[bmaverick]

My 76 YM 155D has blown the bearings out of the steering worm gear AGAIN!
I either need to get a new steering column shaft w/gear block or figure out how to rebuild mine properly.

Last winter, I ordered Hoye’s parts, but they were the wrong length/dia, so I tried to straighten the tubes and put it all back correctly, but it let go after only a few hours of use.
Are there any used parts suppliers you folks have dealt with I could get a column or full steering box assy from or possibly a unit from another model/manufacturer that would fit close?
Or do you have any options for getting it rebuilt or new parts manufactured?

If you need the manuals, the YTOG has several for your YM155(D) machine.
YANMAR YM135 YM155 ELECTRICAL ALT-1.pdf
YANMAR YM135 YM155 YM240 YM330 ELECTRICAL MANUAL.pdf
YANMAR YM135 YM155 PARTS MANUAL.pdf
YANMAR YM135 YM155 SERVICE MANUAL AOD1048.pdf
YANMAR YM135 YM155 YM240 YM330 SPECIFICATION SUMMARY SHORT.pdf
YANMAR SHOP MANUAL YM-1.pdf

I believe the last one, YM-1 goes into the steering gear box with more details.

I saved this posting on the site from 2010. It may help, it may not.

 

[bmaverick]

And @AaronM 's videos are EXCELLENT.

 

[bmaverick]

See the Hoye archived website page in the PDF attached.
Again, @AaronM 's write up is very helpful.

 

[careyo63]

SB-750 Hoye Dia. 19mm

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YM1100 YM1500 the steering is different 15.5mm. Everywhere I look for it.