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John Deere Tractors Discussion Forum
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roosa master fuel pump

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Joshua Hancock

10-02-2007 17:29:09




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I would like to know if anyone out there knows how to turn up an injection pump on a 4320.I have heard that there are shims in the pump and you can remove them.Any help would be great




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jd4055

10-09-2007 16:18:53




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 Re: roosa master fuel pump in reply to Joshua Hancock, 10-02-2007 17:29:09  
You can take the factory leaf spring out and replace it with what I think they call a 7-3 leaf spring, that helps. There is also a governor spring in there you can change, it also helps.



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jjas

10-03-2007 09:35:51




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 Re: roosa master fuel pump in reply to Joshua Hancock, 10-02-2007 17:29:09  
Have you tried turning the "smoke" screw?



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jdemaris

10-03-2007 06:31:05




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 Re: roosa master fuel pump in reply to Joshua Hancock, 10-02-2007 17:29:09  
Once the pump is off and on the work bench, it takes an hour to take it apart, reseal it and put it back together. I had to do many out in the field, from the back of a service truck.

In regard to your question about turing it up - and shims? When the pump was new, there were "limiting" shims to prevent turing up the pump very much. They go behind the single leaf-spring so you can't tighten it down very much. Most pumps, when getting repaired or rebuilt - get the shims removed. It's likely your pump no longer has those shims. Only takes ten minutes to stick an Allen wrench into the pump and see if the fuel-screw will turn in any more. In regard to the pumps being "too complicated" for the average mechanic to work on - no, they are not. The main problem is getting your hands on the proper information - which Deere will sell to you, but Stanadyne will NOT. The injection pump is - more-or-less - just a set of two hydraulic pumps coupled together with various controls -one is high pressure via plungers and the other low pressure via vanes. No more complicated than some carbs I've worked on. Ever taken a Rochester Quadrajet apart? I have more trouble with that then any Stanadyne/Roosamaster rotary pump.

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S.E. Ohio Farmall

10-03-2007 15:27:12




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 Re: roosa master fuel pump in reply to jdemaris, 10-03-2007 06:31:05  
I've been looking for info on rebuilding pumps but haven't had any luck, do you have any for a Stanadyne or Roosa Master? I also agree with you on the Quadrajet, a real mutha to deal with.



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jdemaris

10-03-2007 15:59:50




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 Re: roosa master fuel pump in reply to S.E. Ohio Farmall, 10-03-2007 15:27:12  
John Deere still sells the service manual that will give you all the repair info you need. And, all the parts are available OEM or aftermarket from companies like Spaco. The Deere pump service manual is SM-2045.



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Green Relics

10-03-2007 05:07:20




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 Re: roosa master fuel pump in reply to Joshua Hancock, 10-02-2007 17:29:09  
Hey msb, I guess thats why they put all those seal wires on injection pumps. When she 's still in warranty and goes boom Deere can get out of paying the bill. I guess all of us that worked at a Deere dealer found ourselfs altering equipment to make a sale or keep a customer happy. John



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Mike M

10-03-2007 06:13:38




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 Re: roosa master fuel pump in reply to Green Relics, 10-03-2007 05:07:20  
The dealers have the wires and the seals. They can get away with it.



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msb

10-02-2007 19:45:59




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 Re: roosa master fuel pump in reply to Joshua Hancock, 10-02-2007 17:29:09  
Yes.Yes. Yes to your questions. The pump has to be almost completely disassembled and is not something most novices should attempt without expecting trouble down the road from your pump later on.Take it to someone who has been properly trained in injection pump repair. Chances are the pump could use some freshening up if it has not been rebuilt in the last few years anyway. Not something I would recommend, but the very first 4320 I set up was at the Indiana State Fair where the 4320 was introduced in Indiana that day. Before hardly anyone had even seen the model,the boss wanted to use it as a pull back tractor on the State Fair tractor pull strip.Put a big sign on it that said "Tons of Fun".Hung the sign on the Roll Guard on it.Demo pulled it too. Deere & Company would not have been happy at all if they knew I tore that pump down right out in the dust and dirt in the air.Certainly not a place where any pump should have been opened up, let alone disassembled.But the tractor attracted a LOT of attention during those days at the fair.Turned it wide open,but later set it back down some.
Just one of many fun memories of working for a Deere dealer.

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