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Tractor Talk Discussion Forum

What a Roosa Master flex ring looks like!!

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JD Seller

05-28-2013 21:13:05




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Many of us on here talk about the flex ring falling apart on a RoosaMaster/Stanadyne injection pump that will cause it to plug up the injection pump. Well here are some pictures of the flex ring, governor weight cage, and the new solid weight cage that eliminates the flex ring.
Here is a new flex ring. It is just a piece of plastic/rubber with a row of hole around it. The hole fit over a row of pins that are kind of like rivets on the back of the governor weight cage and its internal drive. Its purpose was to dampen sudden changes in RPM that could cause an issue with the governor weights and cage.
third party image
Here is the old style of weight cage. You can see the pins/rivets on the back side of it. The flex ring fits over these pins/rivets. IF you look close you can see the remains of an old flex ring under some of the pins. The old flex rings where a black rubber like substance.

third party image

Here is a flex ring being installed on the old style governor cage. It is a real pain to do. It helps if the flex ring is soaked in hot water before installation.
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Here is the newer style of solid governor weight cage. You can see where it does not use the flex ring. The only issue I have every had is some smaller engines may "hunt" RPMs at low idle. I have only had it happen on one tractor out of I bet fifty I have installed. This style should not be used on automotive DB pumps. They have too many sudden RPM changes. There is a newer style for them too that does away with the flex ring also. They call it and "EDI" (elastomer insert drive) weight cage. third party image
This post was edited by JD Seller at 07:14:19 05/29/13.

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Diesel_Day_Dreamin

06-14-2013 15:05:46




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 Re: What a Roosa Master flex ring looks like!! in reply to JD Seller, 05-28-2013 21:13:05  
Hello all. Long time reader here and my first time posting...

Thanks for posting your information on this... I have been reading up on rebuilding these after my local shop wanted $550. to ''reseal'' my JDB 431 pump. My ring looks as non existent as the picture you posted above. I opted for the solid governor cage. Of course being a John Deere engine, it has the special cam advance screw that takes the Torx looking tool instead of a standard Allen hex wrench. I asked the parts guy for a hex screw instead and he said it was more than the tool. I ordered the tool and found it to be a standard T-45 Torx bit machined down on a lathe. Nice $31.00 wasted... Anyway the Stanadyne part number for the tool was 24992 and at reassembly this screw gets torqued to 360 in lbs.

I bought a Onan 30 DDA generator for $600 that didn't run for more than 3 minutes when you started it. I couldn't pass up this deal! It only has 629 hrs. Now that I have my kit and other parts, I plan on tackling it this weekend. Now I have 30,000 watts when the power goes out.

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Diesel_Day_Dreamin

06-14-2013 15:10:03




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 Re: What a Roosa Master flex ring looks like!! in reply to Diesel_Day_Dreamin, 06-14-2013 15:05:46  
third party image

Picture of tool bit



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Wilamayb

05-29-2013 15:41:44




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 Re: What a Roosa Master flex ring looks like!! in reply to JD Seller, 05-28-2013 21:13:05  
Seller, are these kits expensive if not why dont diesel repair shops install these? Those rings seem not to last over 10 years regardless of usage hours.



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JD Seller

05-29-2013 19:54:57




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 Re: What a Roosa Master flex ring looks like!! in reply to Wilamayb, 05-29-2013 15:41:44  
The solid governor weight cage is only $40-50. The pump shops do not want a pump failure because of a rapid RPM change. So they put it back to factory specs. That way they are not liable for any thing that might go wrong down the road. Even the 1000 to 1 stuff.

In theory if you raced the engine and slowed it down a lot like in a car or pickup the non dampened weight cage could cause a governor failure. My thoughts are how many times do you race a tractor and pull it back to idle very often??? It is not something that happens with one time of doing it. We are talking about thousand of reputations. So It just about could never happen on a tractor.

My view it that many of the tractors that use the DB pumps only get used in very light conditions anymore. So the time is a bigger enemy of the components rather than usage. So I put the solid cage in. It will not fall apart because of time submerged in diesel fuel.

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Wilamayb

05-30-2013 03:05:34




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 Re: What a Roosa Master flex ring looks like!! in reply to JD Seller, 05-29-2013 19:54:57  
Thanks for the explanation. I'm thinking we will try one next time.



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Dieseltech

05-29-2013 04:44:01




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 Re: What a Roosa Master flex ring looks like!! in reply to JD Seller, 05-28-2013 21:13:05  
EID style retainer was first used on automotive applications, # 27984 with rounded heel weights in 1985 before they were ever released for ag or construction use. Olds 5.7, 4.3, GM 6.2 and 6.5 and Ford/IH 6.9/7.3. Some ag pumps that have the rounded heel weights use the same retainer. New style # 29111 is for pumps with square heel weights used in most ag and construction pumps. Actually the latest Stanadyne pellethane flex ring holds up much better than the previous ring did, have seen them still last over 25 years. I think of the flex ring as a safety fuse as high hour pumps should have the pilot tube and DV spring replaced at least. Have seen heads lock up when the spring breaks and locks up through the rotor ports. Always enjoy your posts, keep it up!

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Duner Wi

05-29-2013 04:27:46




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 Re: What a Roosa Master flex ring looks like!! in reply to JD Seller, 05-28-2013 21:13:05  
Thank you for taking time to post.
I learned something today already.



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wingnut13

05-29-2013 04:14:21




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 Re: What a Roosa Master flex ring looks like!! in reply to JD Seller, 05-28-2013 21:13:05  
Thanks for the info and pictures that explains it very well. I have a 1650 Oliver with that problem, at least now I have a visual of what is going on.

Thanks again



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