WD45 Hydraulics

http://www.grandpastractor.com/index.php/kunena/allis-chalmers-tractors.html Hey welcome. Try this link. Download the manuals for the WD-45 should help.

Yes... to using the controls on the column but if you trace all the lines there may be a diverter valve somewhere. It's also possible that extra control valves were removed and lines/holes were plugged at some point.

What city in central MN are you?

WELCOME to the forum!!
You've already gotten most of the info you'll need.
I suggest you go to Grandpastractor.com and download and then print out or go and buy the operator's manual somewhere.  It'll save you lots of time and head scratching.
Too bad you're so far away from Lon, he could help.  He's got a few of them....

The fill cap with dipstick is the hydraulic system.Doesn't hold a lot and a bad leak will run it down quickly. Must always have oil because rollers are running on a cam in there. Most run hy-tran type oil in hyd these days.Some use it in trans and rear(shared compartment) also with no problems.(the 2 pipe plugs on left)

Tyler-  One note I'll add that I don't THINK anyone else mentioned...

The WD/WD45 hydraulic system can be configured to act many different ways.  The control valve on right side of torque tube has different settings and positions as described in the service manual.

The lift cylinders... there's two... there were some implements used where ONE of the lift cylinders would be disconnected from the rear lift arm... and swung forward to operate a belly or front implement.
IF that implement was a cultivator, it was not unusual to see the leverage ratios set so that the front end segment(s) of such an implement would raise FIRST, so that the rear implement section would finish the rows while the fronts were being lifted out for a turn.

When additional hookups were plumbed, it was typically because the farmer was using some other implement(s) of their own choice, that either needed different connectors, or allowed them to keep some other element operational WITH the implement still being available.  Suffice to say that it takes an understanding of that farmer's implements and circumstances, in order to know what their personal modifications are supposed to do.

If you have a two way remote valve, that has been added by someone at some point. Usually when a two way valve is added then a diverter valve is also added, otherwise you would have to wait for the lift arms to raise before the remote does anything. No biggie if there isn't anything mounted on the lift arms so they don't float down on their own. The diverter works so when it is turned one way hydraulics go only to the lift arms and when turned another way the hydraulics go only to the remotes. Oh and I believe the lift lever on the steering quadrant would be left in the raise position when using the two way auxiliary valve because the should be dumping excess oil to reservoir anyhow. That's if I have remembered everything properly as it's been years since I operated Dad's WD with a two way valve. His did not have a diverter either.

My dad added a log splitter valve to our WD and it had lift and down pressure. He plumbed another line to the back. Rigged the control on the column to the splitter valve control.