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1 Dollar
Long Time User
Joined: 10 Jun 2005
Posts: 594
Location: Central IN
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 Posted: Sun Oct 07, 2012 5:04 pm Post subject: 2020 Won't Change RPM |
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I"ve got a 2020 diesel that doesn"t change RPM. Throttle linkage is working as far as I can tell. It gets better the longer it runs but still won"t reach full throttle. For the first 5 minutes after you start it it is stuck at an idle. Fuel filter was changed this summer and it"s seen less than 10 hours since. I may change it again but I"m not leaning towards that.
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LJD
Tractor Expert
Joined: 22 Sep 2011
Posts: 1905
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| Posted: Sun Oct 07, 2012 5:07 pm Post subject: Re: 2020 Won't Change RPM |
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What style injection pump? If it has a Stanadyne/Roosamster C pump - that's a common problem. Throttle uses rack and pinion gears for the trottle that get worn and stuck.
If you've got the other pump model - i.e. Standyne/Roosamaster DB/JDB - then a lack of throttle repsonse is probably due to air in the system or too much pressure inside the pump due to the exit-fuel sysem being clogged.
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1 Dollar
Long Time User
Joined: 10 Jun 2005
Posts: 594
Location: Central IN
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| Posted: Sun Oct 07, 2012 7:43 pm Post subject: Re: 2020 Won't Change RPM |
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I'll have to look and check for sure which one it is. I'm not familiar with the differences but I'm sure I can figure it out. Is there a tag?
Looking at the post from toolz and your response there, I'm guessing I've got the C. My injector lines mount flat on the circle rather than "around" the pump, if that makes sense. My pump looks more like toolz's C.
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Tx Jim
Tractor Guru
Joined: 14 Feb 1999
Posts: 13145
Location: Coyote Flats,Tx
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| Posted: Mon Oct 08, 2012 3:19 am Post subject: Re: 2020 Won't Change RPM |
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| 1 Dollar wrote: | | (quoted from post at 23:43:24 10/07/12) My injector lines mount flat on the circle rather than "around" the pump, if that makes sense. My pump looks more like toolz's C. |
Sounds as if you have a C type pump similar to photo. 
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LJD
Tractor Expert
Joined: 22 Sep 2011
Posts: 1905
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| Posted: Mon Oct 08, 2012 4:37 am Post subject: Re: 2020 Won't Change RPM |
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If so, the gears are probably the problem. Common ailment on those pumps. If not done once already- you can take out the throttle pinion gear, flip it upside down and get another "lifetime" out of it. 15 minute job. If it HAS been flipped already - you need a new "rack and pinon" set of throttle gears. No longer available new except old stock somewhere - or used parts.
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1 Dollar
Long Time User
Joined: 10 Jun 2005
Posts: 594
Location: Central IN
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| Posted: Mon Oct 08, 2012 7:17 am Post subject: Re: 2020 Won't Change RPM |
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Thanks JD,
Would you be able to give further instructions on getting to that gear? I know you've worked on hundreds of these and this will be my first!
Thanks
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LJD
Tractor Expert
Joined: 22 Sep 2011
Posts: 1905
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| Posted: Mon Oct 08, 2012 9:29 am Post subject: Re: 2020 Won't Change RPM |
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Here are some self-explanatory diagrams.
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1 Dollar
Long Time User
Joined: 10 Jun 2005
Posts: 594
Location: Central IN
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| Posted: Mon Oct 08, 2012 10:40 am Post subject: Re: 2020 Won't Change RPM |
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Pictures are always great. Thanks!
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1 Dollar
Long Time User
Joined: 10 Jun 2005
Posts: 594
Location: Central IN
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| Posted: Wed Oct 10, 2012 4:44 am Post subject: Re: 2020 Won't Change RPM |
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Hadn't been flipped yet. Works fine now. A very easy job!
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