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Noticed on TR86 Fire Prone post a message about a hydroulic pump leak. Had the same problem in my 86 this fall. Made a mess. I changed the o ring on the large outlet twice without solving the problem. Small drops or weeping seen at that site, but no "wetness" other areas of pump. Have pump off now to try to find crack, etc.

Any experience out there with this problem?? Replacement cost is high.

Thanks
 

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Had a TR75 develope crack in pump housing I think Pump cost $1100. I have this pump as I only put 100 hours on machine before retiring. I would sell it if interested, dont know if it will work on 86 but should.
 

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Mine got a crack in the threads that the relief valve plug threads into. Blew oil onto the engine and the whole back side of the combine. After I pulled the pump off and the plug out I could see the crack, but not very obvious. If yours was cracked there it would leak really bad. I ended up getting a used pump for $550.
 

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Mine actually had a pin hole through the pump housing. Had the machine for 7 years before it finally started to leak through it. Air bubble in the casting I guess!
 

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I had header height problems with my TR86 a few days ago. Got it fixed and 2 hours later cracked the hydraulic pump I put in used last fall. The new one I got from New Holland has adjustable relief and flow divider on the outside of the pump and is supposed to handle the shock loads of the Terrain Tracer better. It better for $1100! Meanwhile the back side of the combine is an oily mess!
 

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DRAgon 71 Re: TR86 hydraulic pump

Question for Dragon 71 - what type of problem were you having with header height.


Right now my TR86 doesn't like to lift the header any more than 8-10 inches at a time. I have to keep hitting the button to raise the head off the ground. At an idle it lifts the head all the way in one continuous motion but with high rpm it wants to do it in small increments.
 

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The down light would stay on all the time and the up one kept flashing and the head kept cycling up and down. Found the sensing tube under the header was getting sticky, lubricated all the bushings under the head where the tube goes through and fixxed it, until the pump went!
 

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cross countrie -sounds like you may have a relief issue. When the pump isn't spinning fast it works, but when it is moving quick at high idle it may be hitting relief and not allowing the header to continue lifting. Might be something to check. Also, I suppose you should check your solenoid. If its getting weak it might be getting pushed back to the neutral position by the increased pressure at high idle, but not when the pressure is lower at low idle.
 

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I managed to get my header problem figured out by doing 2 things and I'm not certain which action fixed it.

I pulled the poppet valve out of the header lift contoller on the valve stack and blew some air in to remove any possible debris. But that didn't seem to fix it right away.

Shortly after I was having reel problems. The reel would stop, then start again really quickly.
I pulled the the hoses off at the quick connect and cleaned them up, and after that all my problems seemed solved. The head raised normally and the reel worked better.

I think I was having pressure issues with the return from the reel, would that affect the header lift
 

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shouldn't. The reel speed is run by the pump to the right of the cab (only operates when the feedhouse is engaged) while the feedhouse lift is run by the pump by the engine.

But if its fixed, who cares!!!
 

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I have the same problem with my TR 86 as mention above. When the coolant temp. is high ( in yellow) the header is rising only inches ad the time. Butt only then . Can somebody help my with a solution or a tip.
Thanks
 

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Check the pump belts first. They may appear to be tight but check that the belts are not pulled to deep in the pulley groove. If the belts are wore enough that they are deep in the groove they will not grip the sides of the pulley sufficiently to drive the pump under load.

The next option is to remove the header lift valve from the valve stack and disassemble, flush and reseal. There are two small orifices in the valve that might be blocked. There is also a seat for a poppet that has an oring on it. The oring likes to disappear and the seat can float in the bore. This should take care of your problem of slow or no lift

.
 

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That can a problem with the small oring missing and causing the head to not lift fast or not lift or not. A lot of of times the head will work and sometimes it will not. The seat that is in the header valve has a bullet like poppet that seats into the seat that has the missing o-ring. Also there is a o-ring that seals the bullet around the outer side of it. It gets hard etc. and sometimes it could be gone. A lot of times just the seat o-ring will work for awhile and sometimes not at all---------replace the o- ring as mentioned, parts man can give you print out of the valve for the o-ring replacement. Done the fix several times . Also depending on the serial #'s of the TR86/96 relief types. Fixed them too. Belts can also as mentioned as far getting the pump to turn enough and don't forget the inline filter before the stack valves. Good luck.
 
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