Please help with IH 766 Information

Stuck or leaking relief valve not sure how they are set up if there is a relief valve for the linkage and one for the remotes

Cheers Bluey

Never worked on a 766 that I recall doing, but memory tells me that the inters have 2 oil pumps in the trans case and 2 cavities. one pump is used to move the oil from the smaller cavity in the back of the housing, putting it into the larger front one. there is a baffle between them. If the rear pump fails, you get a shortage of oil. A big expensive job to fix.

However, at the bottom right- hand side of that baffle there is a plastic plug, about 2 inch diameter, sealing a hole between the 2 chambers. You can get at it by removing a plate/housing on the right-- hand side. It could even be the filter housing, I don't remember. You can reach into the housing and with a big screwdriver dig out the plug. The oil then sorts itself out and the transfer pump is redundant. I do know that you don't have to drain the oil, if you have a bank or such that you can run the right- hand wheels up onto to lower the tide on that side enough.

But like I said, it's been a while since I did one, so I could be wr...mista......confu.. You know what I mean.

I'm thinking similar to Bluey as far as a relief valve issue for the remotes.

Brett.

Geez Morris
That recall is impressive, even if you are way wrong.
It's basic mechanical knowledge of a maybe-specialised subject, and experience speaking.
As well as CDF for those who have some knowledge of this subject/problem.
Never cease to be amazed by the knowledge on this forum. (As well s the BS)
When experience is devalued, and computer skills are over valued, who is going to get you going when the solar panels haven't seen the sun for a few day?
Bah humbug

And I should have said said Wee Allis. CRAFT again. Apologies.

Tired Iron,
Did I say something on this thread? I do not remember it and cannot find it. If I did say something, I am wrong. My Wife says that everything I say is wrong.

Thanks all.

Got it sorted today. Was an issue with the control valve. Can’t tell you exactly what the issue was perhaps a bit of junk blocking it. I pulled the cover off, played around with the adjustment screw then pulled the lever a few times and it came good.

Wee-Allis, that’s some great info. Thanks for passing it on. Definitely due for that service I was meant to do all that time ago.

Thank you again.

These inters have lots going on inside, I have had them pulled right down just a housing a couple of times

I don't ever recall seeing a larg plastic plug, I must pay closer attention next time ( if there is a next time )

Front pump does TA, steering, brakes, clutch and helps with the rear pump when needed

Rear pump does linkage, remotes and helps with the front pump when needed

Remotes have no pressure at all until demand requires it

As in there is no flow to remotes until the tractor senses the need and then allocates a oil supply

This allowed with the old IH break away couplings to be hooked and unhooked under pressure, most break away couplings of the time did not allow this

The hydraulic system can be quite fiddly to setup, but once set up is idiot proof and reliable

Or at least thats my experience, as I have said, I have had these fully apart more than once

Glad you have it sorted

I have made special jigs and tools for testing and working on the 86 series which is very similar

Paul

Thanks for the info Paul. Whilst I’m looking at it I’m going to fix a pretty heavy leak coming from the Steering Hand Pump. Brace yourselves for the next series of questions. Haha.