Terramite Hydraulic dipstick measurement

[Joemjm]

I have a Terramite T5c and the hydraulic tank cap does not have a dipstick on it (it was broken off at some time) . Does anybody know how many inches of hydraulic oil should be in the tank at full or have a measurement from the bottom of the threads on the filler cap to any of the markings on the stick so that I can check for the correct amount of oil in tank