M3DPO wrote:

Actually it’s nearer 12ltr to do a flush, there are much cheaper suppliers of oil, look on eblag, not genuine ZF but there again ZF make gearboxes not oil, they only set the spec needed, Ravanol is one recommended brand, about £10 per litre.
Do you understand what Dr Tranny miraculously does to cure the judders?- ok, I’ll inform you, it makes the oil seals swell, nothing else. The main cause of juddering is lack of oil pressure to the clutches, the oil pressure is lost through the seal on the output shaft of the gearbox failing, the reason it has failed is because the bushes are worn.
Ultimately all you are buying is time and the only certain long term cure is replacment TC, new shaft bushes and seals.
Change the oil, use recommended dose of Dr T by all means don’t bother changing the pan yet, but I’m afraid you are only buying time, not a permanent cure, even a replacement TC without the shaft bushes and seals will fail in a few months, most recommended installers will not just fit a new TC without fitting the shaft bushes and seals.

Hi

Always wondered how the Dr tranny worked , so is it in general if the revs fluctuate it’s normally the TC and as u say with judder it’s the oil pressure , in a very basic sort of way

Out of curiosity Is it ever possible to replace the shaft bushes urself or always a ZF specialist job

Thks as always for sharing ur knowledge

Gary

  

lynalldiscovery wrote:

If you just drain the pan you will be lucky to get 4 litres out.
If you search on here for Filos gearbox oil change it shows you how to do a diy flush, dead easy and uses about 7/8 litres .

That’s true if you just drain the pan twice method which always leaves 50% still in the system, doing a flush you need more to do the actual flush until clear new oil comes through.


GStewart: you can do anything yourself if you have time and money the bush and seal fit where the lilac/green section is in the drawing, I don’t see any reason why a competent guy could not do it even if the shaft is worn, but done professionally you will get at least one year warranty.
Both revs fluttering and judder are caused by the clutch(es) slipping usually due to insufficient oil pressure, once they start slipping the situation gradually gets worse.

In the early days of this type of gearbox fitted to tractors there where no solenoids or mechatronics, gears where selected with cable operation through a rotary selector, it was called Selectomatic, each cable had to be set up to operate mechanical clutches, as the cables and clutches wear it was quite common to jump from 2 gear to 5 or 6 when you wanted 3 for instance or in a worse case even reverse, needless to say they soon lost popularity.