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Ford Tractors Discussion Forum
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1961 871 sos

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871diesel

10-26-2016 05:00:41




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After 15 years she quit moving.

No pressure to transmission control valve.

PTO spinning when running.

Do I need a pump or pump rebuild kit?

I cleaned pick up screen and removed control valve,

still no fluid making it from pump to transmission manifold.

Thanks for any information you may offer.




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Larry NCKS

12-07-2016 12:25:47




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 Re: 1961 871 sos in reply to 871diesel, 10-26-2016 05:00:41  
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Redundant and too complicated,. As you can see, I already told him the plain and simple way.



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Sean in PA

12-06-2016 05:51:40




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 Re: 1961 871 sos in reply to 871diesel, 10-26-2016 05:00:41  
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Sounds like when the control handle is in the Park position that the transmission is actually in neutral if the next position is first.
When you say "all gears work", do you actually have 10 forward speeds and 2 reverse speeds? If you only have a reverse when the control handle is in the 10th gear position, then you are missing one of the two reverses. Also, does it actually go into Park when the controller is in 9th gear position?

Service manual should tell you how to set the control valve into the Park position before putting the top cover back on, plus how to put the top on without losing the proper positioning of the control valve.

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Larry NCKS

12-05-2016 11:17:22




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 Re: 1961 871 sos in reply to 871diesel, 10-26-2016 05:00:41  
If you have the top cover off, roll the trunnion shaft until the lobe on the cam engages the safety start switch. That is Park.



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871diesel

12-06-2016 05:42:52




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 Re: 1961 871 sos in reply to Larry NCKS, 12-05-2016 11:17:22  
Thank you MUCH.
Hope you have a wonderful Christmas season.



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Larry NCKS

11-03-2016 21:09:07




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 Re: 1961 871 sos in reply to 871diesel, 10-26-2016 05:00:41  
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You're welcome. Glad we've got you on the road to recovery.



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871diesel

12-05-2016 07:03:05




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 Re: 1961 871 sos in reply to Larry NCKS, 11-03-2016 21:09:07  
got her going BUT.
From park: 1st click of gear selector should be Reverse but it is 1st gear.
all gears work. 10th gear position is reverse.
I think I need to put the cam on top of valve body in park first but don't know how to tell.
Any thoughts?



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Larry NCKS

11-01-2016 17:44:49




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 Re: 1961 871 sos in reply to 871diesel, 10-26-2016 05:00:41  
donor transmission means find a salvage transmission somewhere that still has a good pressure line



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871diesel

11-02-2016 07:19:19




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 Re: 1961 871 sos in reply to Larry NCKS, 11-01-2016 17:44:49  
Thank you for your help with this.
Never underestimate the power of a willingness to help.
In my case, it is greatly appreciated and encouraged me to tackle a project that I probably would not have undertaken without your help.
Arthurs had everything I have needed so far. Parts should be here today. $135 and a couple of weekends should put me back to pulling trees.



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showcrop

11-01-2016 04:33:41




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 Re: 1961 871 sos in reply to 871diesel, 10-26-2016 05:00:41  
John Smith also, of oldfordtractors.com does a lot with SOSs.



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Larry NCKS

10-31-2016 21:16:44




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 Re: 1961 871 sos in reply to 871diesel, 10-26-2016 05:00:41  
Best to find complete pressure line. Donor transmission would be best. Arthur's tractors in Indiana, PA is a good place to know as well.



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871diesel

11-01-2016 07:51:58




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 Re: 1961 871 sos in reply to Larry NCKS, 10-31-2016 21:16:44  
is donor transmission a place? or does it mean find an old sos and use it for parts.
I get medical stuff when I google "donor transmission".
Thank you for taking the time to help with this.



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Larry NCKS

10-27-2016 05:47:53




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 Re: 1961 871 sos in reply to 871diesel, 10-26-2016 05:00:41  
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Pressure gauges at the servos are all I know, other than a front split look see as you've already guessed.



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showcrop

10-27-2016 05:00:57




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 Re: 1961 871 sos in reply to 871diesel, 10-26-2016 05:00:41  
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The PTO normally turns just from the drag in the clutch pack, not from the clutch being engaged.



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Larry NCKS

10-26-2016 23:22:14




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 Re: 1961 871 sos in reply to 871diesel, 10-26-2016 05:00:41  
Could be O-rings or broken pressure lines too. Any hydraulic sounds, fluid spraying under steering column, etc.?



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871diesel

10-31-2016 19:07:17




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 Re: 1961 871 sos in reply to Larry NCKS, 10-26-2016 23:22:14  
Got her split at front.
Found broken pressure line. Broken flush with fitting at adapter plate.
Not sure if I can remove piece of broken tubing from fitting without damage.
Do you know where to get fitting or have one made?



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871diesel

10-27-2016 04:58:51




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 Re: 1961 871 sos in reply to Larry NCKS, 10-26-2016 23:22:14  
Thanks for the reply.
No fluid sounds that I can hear.
I can see the transmission pressure tube going into the fluid distributor.
Pretty sure I need to split the tractor at the front to pull the pressure line and
check the pump? Any way to find out without splitting?
The PTO turning is confusing.



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