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Super 90 PTO (round 2)

T

Tracy Brown

Member
Posted a few days ago about the PTO slipping some under load. Was suggested that I check PTO pump pressure.
First question. After studying my parts manual some, do I understand correctly that the PTO control lever only operates a hydraulic valve,
nothing mechanical about it?
2nd question. If the PTO pump pressure is low, can I assume the PTO can slip even if the clutch discs are fine.
3rd question. How do I check the PTO pump pressure?
I found what was called a service repair manual on the web but it was only 70 pages and covered a few different tractors. That doesn't sound
much like a comprehensive manual with only 70 pages. My parts manual is 2" thick for just the Super 90. What do you think?
Thanks for the expert info and advise.
 
Yes, the PTO lever just moves a spool valve to direct oil to the clutch pack. If pressure is low a known good clutch can slip, but if it slips very long the plates will warp and be ruined. There's a steel oil line that fits inside the trans front cover that takes oil back to the valve, I have seen this line pop out of place if it's not the right length. The power steering return oil is used to supply the PTO and Multi-Power clutch assembly. Hope you have the eight speed trans as they are less trouble. There should be a pressure test tap on the steering return line to check the pressure where it goes back into the trans front. 175-225 PSI sticks in my mind but check the service book. The front of the line that I've seen come out of place can be seen with the power steering pump removed.
 
I have the 8 spd. Glad to hear it's the ps pump that powers the PTO. The ps seems a little stiff which I assume could be a weak pump. I will ck the pressure on it. I have a couple of parts Super 90s that I can get a pump off to try. Thanks for the info.
 
A weak PS pump will give the trouble you have too. Also be aware the 85 and 88 PS pump will work to BUT MF changed the pump drive gear tooth pitch. 85 and 88 gear will not fit into a S90, and vice-versa. So make sure the correct gear is used if you get a pump from a bone yard.
 
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