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JD 1020 Fuel Delivery Problem... Help!

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SmallOps

07-31-2001 13:18:51




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At operating temp. and under load, my '73 JD 1020 diesel tractor will occasionally lose RPM's slowly (over 5-15 seconds) until it reaches low idle. At low idle the tractor continues to run fine. Any input from the throttle has no effect on the engine speed.

If I shut the tractor off, when it exhibits this strange behavior, and then start the tractor immediately it runs just fine! All throttle inputs produce normal power and I can continue working the tractor for a period of time (5 min. to several hours) then the same power/RPM drop will happen again!

I've eliminated fuel contamination as the problem (cleaned lines and replaced filters) and the fuel cutoff selonoid is OK. I've centered attention on the Roosa Injector Pump, specifically the governer mechanism. The fuel pump is also a possibility.

Has anyone any ideas about the cause of this slow RPM shutdown problem? If you guys can help me figure out the possibilities, then my JD dealer and I can work this problem out in the shortest time, I'm sure.

Any helpful comments would be greatly appreciated. TIA

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SmallOps

08-02-2001 04:28:30




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 Re: JD 1020 Fuel Delivery Problem... Help! in reply to SmallOps, 07-31-2001 13:18:51  
I am greatful to all who took the time to help me. I am amazed at the collective experience of you folks. The only way I can repay you is to contribute my $.02 to this site, when appropriate.

THE ANSWER: Don is correct. Twopop is also to be credited for recognizing Don's answer as "a bullseye". Both L.C. and rhudson, plus other emails,and a Rummy's JD board posting, make it clear that it would be a good idea to drain, inspect and clean the fuel tank.

MY ACTIONS: The Roosa-Master Injection Pump will to sent to a fully equiped, compentent rebuilder in Plymouth, Minnesota for R/R of the govenor retaining ring, etc. I will pull the injectors and send them along for a bench check/inspection at the same time.

I will remove/inspect and clean the fuel tank, while wainting for the injector pump to be finished. Also, I'll complete the 500 and 1000 hour regular maintenance items in the JD Manual and rebuild the starter.

Again, thanks to all of you.

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twopop

07-31-2001 18:40:49




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 Re: JD 1020 Fuel Delivery Problem... Help! in reply to SmallOps, 07-31-2001 13:18:51  
Don hit the bullseye,that is the problem,and the cure.this is typical with the roosa-master.



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L.C.

07-31-2001 15:32:32




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 Re: JD 1020 Fuel Delivery Problem... Help! in reply to SmallOps, 07-31-2001 13:18:51  
If you have the sediment bowl on top of the fuel pump, remove the sediment bowl and clean the strainer screen out (it lifts off). A rusting fuel tank will produce flakes that get caught and restrict fuel flow through this strainer.

It definitely sounds like a fuel restriction problem. Let us know what you find out.



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Don

07-31-2001 13:57:24




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 Re: JD 1020 Fuel Delivery Problem... Help! in reply to SmallOps, 07-31-2001 13:18:51  
The rubber retainer ring on the governer weight retainer is breaking up and a small piece gets over the return fitting and shuts the pump down. when you shut the tractor off the piece falls down and is ok until it picks it up again. the cure is a pump overhaul to replace this ring , the new retainer ring is solid ( runs abt $65-70)and does not have this ring. the pump kit is abt.$30.00 and the labor should run a couple hours but the dealer wont do it for this amount. he will want to replace the pump with a rebuilt one for $5-600. Take your pump and have it rebuilt. Don

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rhudson

07-31-2001 20:10:20




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 Re: Re: JD 1020 Fuel Delivery Problem... Help! in reply to Don , 07-31-2001 13:57:24  
My jd dealer estimated $600 to 1000 to repair or replace pump. company in raleigh nc rebuilt it for under 150 (1995). also had crud in bottom of 1020 tank that restricted fuel. took tank off and cleaned.



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