Which is return line?

[jblueridge]

I never take enough pics when I tear stuff down.
I don't know which fitting on my steering gear box is for the return line.
It is a RHD JDM BJ74. Check out the picture below.
The return line metal tube won't thread into the fitting/hole marked H20 (H2O?)
The either end of the pressure hose will thread into either fitting on the steering box.

 

[OGBeno]

Sucks doesn't it.

"Mystery mark" side is your return. Any Toyota parts diagram shows that and that is the normal configuration from Toyota on a worm gear steering box.

 

[sadam_husain]

low pressure return is always closest to the seal side of the shaft, both fittings are different thread sizes, they are really close but different sizes

 

[jblueridge]

Guys, your responses have just rescued me from a completely shi**y morning. Thanks!
The diagrams I checked did not seem to be for RHD.
It seemed to make sense that the return line would only thread into its correct fitting. Most of my life is not sensible now that school is back in session and I am assigned to teach 9th graders again

 

[fireball]

Jblue - thanks for documenting all the work you're doing to the truck, fun to watch along!

Thanks to the guys who respond with the good tech advice! I'm not the best wrench around, but I can follow instructions when someone smarter than me can help direct me in the right direction