Frozen 806 Hydraulics Revisited

At that time Esso had a product called Hydraul 50, I had used that for a number of years, without any problem. Hydraul 56 was new and the dealer convinced me it's was a new improved replacment for hy tran. During the summer I had added varying amounts to my 300, 560 and 656. 50 gallons of Hydraul 50 and 3 new hydraulic pumps later my problem was cured. You could have a similar situation. Personally I've never seen an oil cross reference I trusted yet.

Did you use hytran spec fluid?

Theres some AW32 floating around out there (at automotive stores) that is alot thicker then hytran.

Maybe something is wrong with the system and heating up the fluid makes it thinner allowing it to work? I'm by no means an expert, just trying to help out.

For the most part, cracking the drain plug and having no water come out does not mean theres no water in the system.

Is your fluid milky or does it look like normaal oil?

A word of caution, if yours is milky and you do decide to replace the oil, be sure to get all of the old oil out, as much as humanely possible. I have this same issue, tomorrow I'm going to redrain my system (i just put new fluid in it and cleaned the resevoir and it still becomes milky from leftover fluid in the hoses/cylinders) and cook out the water. The 806 has ALOT more fluid then my 300u.

When changing the fluid in the trans/diff it is also a good idea to change the final drive fluid also. 06 models came with a separate reservoir and fill plugs. They is a cup type plug on the inside of the inner axle bearing bore and a seal on the brake pinion shaft. When servicing the final drives on these tractors it is advised to leave the plug and seal out and to drill a couple of holes through the rear housing so the oil can get through to the final drives and outer axle bearings. When this is done the fill/check plug on the axle housing should have the square head sawed off to identify this change.

If you drain the final drives and you do not know if you tractor has been upgraded, simple fill the transmission as normal then crack the final drive drain plugs again to make sure oil has filled the housings. (Be sure to drain enough to be sure it is new oil and not just more that has found it was to the drain plug). If not you will need to fill the final drives through the fill/check plugs.

It is not unusual to find one side upgrades but not the other so be sure to check both sides.