Sheppart steering for DM690. Need help.

[Vladislav]

I had an issue with that steering gear when purchased the truck. But put myself into even larger issue due to lack of attention.

Originally there was obviouse damage to the input shaft seal. And also the top cover bolts were partially removed and those which hold the joint bracket too. So looked like somebody tried to fix the leak but hadn't. After I fired up the engine and drafted some fluid into the reservoir the seal (or the place it supposed to be) started spitting oil if I spinned the steering wheel. I drove the truck for 20-30 meters to get it into my property from the street. Than parked for better times. Recently a need showed up to relocate the truck. I had a couple of similar gears off R-models in a shed and figured to just swap the unit. We put plenty of efforts to pull the Pitman arm off the shaft and have extracted that darn weighty piece of iron from the chassis.

And only when it was off I could find out although general look was very similar the DM unit appeared notably larger than those I had off R's. 

This way there's a need to swap the seal at least or revise it fully (that's preferrable). One moment I dislike we had to heat up the Pitman arm by torch since it didn't go otherwise and I now worry on the condition of its shaft seal either. The shaft hasn't become really hot and I saw no smoke from that spot but seems reasonable to make the check or a swap.

So the questions are:

Can anybody identify the model? I haven't found any serial number/stampings. Cast digits only.

Is there repair manual avalible?

What are the part## for both input and output seals?

Thanks in advance, any input is very appreciated.

[Vladislav]

[mowerman]

This is where mine was good luck  It was right at the top of the triangle.

[Vladislav]

Looks very similar. Could you locate any spairs for it? I just missed that part in your whole long story. Even tried to rifle through but ran outta time.

[mowerman]

Yes, somewhat  limited but still out there I got my parts from straight line  steering in San Jose California 

[mowerman]

Oh wait a minute,,,, are you asking if I have leftover parts???

[Geoff Weeks]

Vlad,

that seams to be a "Three number" series Sheppard.  It might (likely) has the three digit number cast into the housing on the one side you don't have a picture of.

The complete number includes a sub-model that will be stamped into the face under the spacer that is held on now by one bolt on the output shaft side. 

I think I have posted the manual for these, maybe in @mowerman thread. If not I can go looking for it in my files and post again.

These boxes tend to leak at the input shaft, and that is a high pressure seal. The grease zerk on the side is there to pump grease in and force dirt out of the outer seal before it can damage the inner seal.

 It is real common after they see a lot of years use, for the shaft to wear to the point it will not "take" a seal, and then the hard shaft has to be replaced or welded and re machined and then hardened.

The output shaft seal is in the low pressure (return side) of the box and doesn't often leak even when the bushing behind it is well worn.

I think 592 is the largest in the series, I don't know if that is what you have or not. I don't think it is the earlier two digit series.

I think parts are still available but it has been 10 years or more since I got some.

[Geoff Weeks]

Looks like it:

592 box

[Geoff Weeks]

Here, attached is the manual.

Sheppard-Manual-92-Series.pdf

[mowerman]

Well, you beat me to it. I was going to say I could post pictures. I still have all that stuff on my computer and yes, I think his number is probably on the opposite.Side