Hello,
Firstable, I'm a French guy from French Polynesia, and i'm a beginner in the "Forklift world", so please, excuse my poor english level.

I'm working on a Hyster 3.00 Fortens (L177B30517H).

The redlight "oil Transmission temperature" switch on with the message "Trans brake Limited, Use Brake" when i begin to drive in high speed. But when i drive slowly, there is no problem.

The Oil Transmission Level is OK

I use a software for diagnostic, and any fault code is activated.
I have check with the software the sensor information, it look good, but i also change the Temperature sensor, to be sure, but nothings change.

If someone has already seen this kind of problem, Thanks for the help.

Once again, sorry for my english grammar... i'll do my best! :)

Best regards.
Paul.