Thank's Jeff!
Now I know the right type of oil!
I posted some photos of it in Picasa.
Take a look at:
https://picasaweb google com/104871392854499023512/KomatsuForklift
(add dots on both side of the google-word)
As You can see the transmission is real dirty.
Is it possible to see in the pics where are the right ports to measure the pressures?
-Gary-
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