Allis 200 SN 1803 Hydraulic PTO

It could be disconnected internally. Check between the battery box and the torque tube for a lever that might have moved.

Turn pto by hand. If it spins free, coupler has slid forward. If there is some drag you have other problems.
No need to split for most pto repairs. Drop pto box.    MACK

Thanks so much for the information.  The pto does turn easily by hand and will check pressure.  I'll look for something behind the battery box even though my hydraulic pto doesn't have any linkage or lines going that way.  Verified all of the hydraulic lines go to and from the correct place.  Made my way through the PTO valve and found the control rod side prone to stick so polished it up.  On the other side found a chunk gashed out of the relief valve spool which made the plunger stick.  Didn't find the chunk.  It was hard to tell if the tiny orifice was plugged but it may have been.  Would this damage make the pto system completely unresponsive ?  Is this a salvage yard only part ?

Edited by smitty78 - 07 Jan 2019 at 8:29pm

Since the PTO valve damaged parts are mated to the parts, I got a valve outa salvage.  The one sent is the greater than SN 4001 version but perhaps it will work.  Strangely the caps were switched compared to my old valve.

Theres springs and balls that hold the coupler in one spot, the balls fall into detent holes that holds them

And of course there is a metal strap with a hole in it, attached to a shaft between the battery box & housing.  Initially looks like an anchor point for something.  Doesn't look like an adjustable lever, no handle, nothing in my owners manual about it, no stickers or cast features to hint which direction engages or disengages, but it's there and it moves the coupler into engagement by rotating the hole in the strap toward the radiator.  Likely didn't need a new valve at all but live & learn.  I owe you guys coffee & pie, if only there was anywhere to get it anymore. 

Edited by smitty78 - 26 Jan 2019 at 4:40pm

If you are losing hydraulic oil (left dipstick when sitting in the seat) and gaining oil in the transmission/differential (right dipstick when sitting in the seat), the problem requires a split of the tractor at the area under the platform. No proper fix without a split.  There can be a homemade oil transfer hose installed to allow oil to level itself out between the two sumps. I assume two drain plugs are removed and a hose connects between them. Don't actually know as I've never done one that way.

You must not have the platform cover over the dipsticks installed ??