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JD 955 (Yan) diesel will not rev up

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Ed H.-OH
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PostPosted: Sat Apr 20, 2013 6:25 am    Post subject: JD 955 (Yan) diesel will not rev up Reply to specific post Reply with quote

Guys Hello, A friend of mine has this tractor. It sat for long time. Got it running, Starts right up, idles and runs smooth. But will not throttle up. Takes it a couple of minutes to get to 1500, and after it warms up a while will get to 2500.
Any insite on this would be appreciated, Thanks-Ed
 
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Bob
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PostPosted: Sat Apr 20, 2013 6:49 am    Post subject: Re: JD 955 (Yan) diesel will not rev up Reply to specific post Reply with quote

Rack in injection pump is sticky. Plunger pump bolts to side of engine and plungers are operated by extra cams on the camshaft.

NOT sure if it will loosen up with time /fuel additives and perhaps an engine oil change!
 
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Ed H.-OH
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PostPosted: Sat Apr 20, 2013 7:02 am    Post subject: Re: JD 955 (Yan) diesel will not rev up Reply to specific post Reply with quote

Bob , Hello, Thanks for the response, I will pass this on, Do you by chance know how much pressure the lift pump should make? -ed
 
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Tx Jim
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PostPosted: Sat Apr 20, 2013 8:39 am    Post subject: Re: JD 955 (Yan) diesel will not rev up Reply to specific post Reply with quote

Ed H.-OH wrote:
(quoted from post at 11:02:15 04/20/13) Bob , Hello, Thanks for the response, I will pass this on, Do you by chance know how much pressure the lift pump should make? -ed


I could find no lift pump listed in parts. Is fuel return line unobstructed back to tank?
 
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Ed H.-OH
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PostPosted: Sat Apr 20, 2013 8:56 am    Post subject: Re: JD 955 (Yan) diesel will not rev up Reply to specific post Reply with quote

Jim Hello, I haven"t seen this tractor, He said it has a little pump mounted on the rear of the injection pump, I know a lot of inj. pumps will not run right unless the lift pump feeds it fuel under pressure . He replaced all the fuel lines.
Thanks for your response. -ed
 
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Tx Jim
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PostPosted: Sat Apr 20, 2013 9:27 am    Post subject: Re: JD 955 (Yan) diesel will not rev up Reply to specific post Reply with quote

I don't see a lift pump on the inj pump.
 


Last edited by Tx Jim on Sat Apr 20, 2013 9:28 am; edited 1 time in total
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Ed H.-OH
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PostPosted: Sat Apr 20, 2013 9:33 am    Post subject: Re: JD 955 (Yan) diesel will not rev up Reply to specific post Reply with quote

Jim, Thanks for the pic, solves that problem lol-ed
 
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jd2cylman
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PostPosted: Sat Apr 20, 2013 9:42 am    Post subject: Re: JD 955 (Yan) diesel will not rev up Reply to specific post Reply with quote

What about this one? 955 inj pump

I'm not real familiar with these, but this is the only pump jdparts shows. Catalog #2263 - 955 Compact utility, Correct?

Adrian
 


Last edited by jd2cylman on Sat Apr 20, 2013 9:48 am; edited 1 time in total
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Ed H.-OH
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PostPosted: Sat Apr 20, 2013 9:53 am    Post subject: Re: JD 955 (Yan) diesel will not rev up Reply to specific post Reply with quote

Hello, Thanks for the pic. That's more like it,Do you by chance know how much pressure the Lift pump is suppose to put out. Thanks again, -ed
 
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jd2cylman
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PostPosted: Sat Apr 20, 2013 9:56 am    Post subject: Re: JD 955 (Yan) diesel will not rev up Reply to specific post Reply with quote


Jim,

Your pic looks like a 950, not a 955.

Adrian
 
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Tx Jim
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PostPosted: Sat Apr 20, 2013 10:39 am    Post subject: Re: JD 955 (Yan) diesel will not rev up Reply to specific post Reply with quote

jd2cylman wrote:
(quoted from post at 13:56:10 04/20/13)
Jim,

Your pic looks like a 950, not a 955.

Adrian


Oops Thank you for correcting my SENIOR moment.
 
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Tx Jim
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PostPosted: Sat Apr 20, 2013 10:47 am    Post subject: Re: JD 955 (Yan) diesel will not rev up Reply to specific post Reply with quote

Ed H.-OH wrote:
(quoted from post at 13:53:45 04/20/13) Hello, Thanks for the pic. That's more like it,Do you by chance know how much pressure the Lift pump is suppose to put out. Thanks again, -ed


Sorry for my misinformation. Now that Adrian pointed me in the correct direction I suggest to remove hose from fitting(parts key #13) to see if fuel comes out fitting with engine running. If no to very little fuel comes out of fitting then I suggest to remove valve(parts key #16) and run engine to check for rpm's.
 


Last edited by Tx Jim on Sat Apr 20, 2013 10:50 am; edited 1 time in total
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Ed H.-OH
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PostPosted: Sat Apr 20, 2013 11:35 am    Post subject: Re: JD 955 (Yan) diesel will not rev up Reply to specific post Reply with quote

Jim, Hi!, That is very ok, your intent was good, Thanks -ed
 
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bill finn
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PostPosted: Sat Apr 20, 2013 3:53 pm    Post subject: Re: JD 955 (Yan) diesel will not rev up Reply to specific post Reply with quote

make sure the fuel shut off solenoid linkage is adjusted correctly,Disconnect link then crank engine momentary and leave key on. This will hold the shut off plunger in the solenoid body while you adjust the link. Now while holding the shut off lever in the injection pump towards the linkage you previously disconnected, adjust the link so the pin slips back in. I am not saying this is your problem but I did fix one the other day that acted the same way and it might be worth a try. Good luck
 
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jdman(MO)
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PostPosted: Sat Apr 20, 2013 6:58 pm    Post subject: Re: JD 955 (Yan) diesel will not rev up Reply to specific post Reply with quote

Change fuel filter (first thing)
 
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