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Old 05-03-2023, 04:58 PM   #1
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Shepard steering block leak

My Shepard steering box has a leak at the vent hole. They don't sell a replacement plug and say to silicone the hole closed. It is still leaking. I cleaned it with acetone first but it is still leaking. Here are a couple of pictures and one picture you can see Hydraulic fluid on my generator exhaust from driving about 300 miles. Any suggestions???
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Old 05-03-2023, 07:37 PM   #2
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Tim,
Not 100% sure but I think the leak is from the dust cap on the sector shaft. I have a M100 Sheppard manual, here's a link https://www.rhsheppard.com/wp-conten...v-B_8-2014.pdf , and it does say that after assembly you are suppose to cover the hole with RTV type sealant.
But at the end of the sector shaft there is an O-ring and my guess it's leaking there and since the dust cover isn't suppose to contain pressure it just leaks.

There is a Sector Shaft seal kit

https://www.amazon.com/M100-Power-St...09RZJY9R2?th=1 that you can buy and the job can be done without removing the steering box. I found this video and it looks like the rig had the same type of leak.






The seal kit isn't that expensive IF this is the right one.
https://www.amazon.com/M100-Power-St...09RZJY9R2?th=1
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Old 05-03-2023, 07:45 PM   #3
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Question, are you satisfied with how your rig steers?? If you aren't a TRW swap may be an option

But if you are satisfied a ~$50 seal kit and a little grease on your hands may also be an option and just repair your current steering box.

Tough call.
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Old 05-03-2023, 08:13 PM   #4
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I actually love the way my motorhome steers. There’s no play at all so I guess I’m lucky with how my steering gearbox was put together. I will look at the manual and see what I can figure out. Thank you.
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Old 05-03-2023, 09:09 PM   #5
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If you want to plug the hole until you get time to repair or replace the steering box, Amazon sells a silicone tapered plug kit. These are made for powder coating and fit very tight. I had to use a channel lock to remove it.

40 Pc 1/16" to 3/4" High Temp Silicone Rubber Tapered Plug Kit - Powder Coating Custom Painting Supplies https://a.co/d/8Gx5b8a
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Old 05-03-2023, 09:28 PM   #6
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Looking at the video and manual, I'm not even sure I have a Shepard M100 steering box. That's what the build sheet says for my coach. Here are a couple more pictures if anyone can look at them and say for sure???
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Old 05-03-2023, 10:00 PM   #7
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Quote:
Originally Posted by vito.a View Post
If you want to plug the hole until you get time to repair or replace the steering box, Amazon sells a silicone tapered plug kit. These are made for powder coating and fit very tight. I had to use a channel lock to remove it.

40 Pc 1/16" to 3/4" High Temp Silicone Rubber Tapered Plug Kit - Powder Coating Custom Painting Supplies https://a.co/d/8Gx5b8a
Thanks Vito, I may go that route until I can get it to a shop. I'm full time and don't have the tools to do the seal job. I'm still not sure I have a M100 box.
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Old 05-04-2023, 05:58 AM   #8
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On my rig I can clearly see the word "Sheppard" cast into the box.


I'll take a look to see if I can see where it is.
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Old 05-04-2023, 06:00 AM   #9
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I believe the end you are showing may be the cylinder head.
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Old 05-04-2023, 06:03 AM   #10
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Quote:
Originally Posted by Timaz View Post
I actually love the way my motorhome steers. There’s no play at all so I guess I’m lucky with how my steering gearbox was put together. I will look at the manual and see what I can figure out. Thank you.

I'm one of the lucky ones to as my rig drives great, and I'd never consider changing to a TRW unless my steering box completely fails and can't be repaired.
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Old 05-04-2023, 10:15 AM   #11
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Quote:
Originally Posted by jacwjames View Post
I believe the end you are showing may be the cylinder head.
So it is a M100 box?
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Old 05-04-2023, 02:42 PM   #12
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I went out and took a couple picture of mine, I think yours is a Sheppard M100.



First picture is looking up. Second picture is the cast numbers are on the outboard side where your hoses are hanging down? In my picture I can make it out pretty good.



How bad is the steering box leaking
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Old 05-04-2023, 02:48 PM   #13
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Also, the way mine is mounted it would have to be removed to be able to replace the seal kit, no room to pull the sector shaft out.



Just throwing this out there but I had a bad hydraulic leak on the front of the 4WD tractor, would have been a real pain tear it apart to fix. Some one recommended I try this,

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
It did stop the leak for ~4 years, I am going to add it again. I've also used it in my wifes Chrysler Town & Country, the thing started using/leaing oil, added the ATP and it stopped it for ~ year.


You might be able to make it home if it slows/stops the leak.
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Old 05-04-2023, 03:22 PM   #14
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Quote:
Originally Posted by jacwjames View Post
I went out and took a couple picture of mine, I think yours is a Sheppard M100.



First picture is looking up. Second picture is the cast numbers are on the outboard side where your hoses are hanging down? In my picture I can make it out pretty good.



How bad is the steering box leaking
It's leaking enough to leave a trail down the side of the coach. Not real bad but enough. Thank you very much for the pictures and it does confirm what I have. I pulled the wires back and can see it on mine. I think I have found a shop here that can fix it. fingers crossed.
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