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1961 871 sos

8

871diesel

New User
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.
 

Could be O-rings or broken pressure lines too. Any hydraulic sounds, fluid spraying under steering column, etc.?
 
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.
 
(quoted from post at 04:58:51 10/27/16) 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.
Click to expand...

The PTO normally turns just from the drag in the clutch pack, not from the clutch being engaged.
 
(quoted from post at 06:58:51 10/27/16) 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.
Click to expand...

Pressure gauges at the servos are all I know, other than a front split look see as you've already guessed.
 
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?
 

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.
 
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.
 
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.
 
(quoted from post at 09:19:19 11/02/16) 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.
Click to expand...

You're welcome. Glad we've got you on the road to recovery.
 
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?
 

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.
 
(quoted from post at 11:03:05 12/05/16) 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?
Click to expand...

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.
 
(quoted from post at 08:51:40 12/06/16)
(quoted from post at 11:03:05 12/05/16) 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?
Click to expand...

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.
Click to expand...

Redundant and too complicated,. As you can see, I already told him the plain and simple way.
 
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