Case 580ck clutch and power shuttle questions

Case 580ck transmission and power shuttle questions and problems
I have a 1967 Case 580ck S/N 8318229 diesel with a power shuttle. I got my reprint service manuals in the mail a couple days ago and have been pouring through them.
A couple immediate issues i'd like to diagnose are as follows:

The transmission cannot be shifted while the tractor is running. I push the clutch pedal in and if I attempt to shift form neutral to any gear the transmission grinds. If I start the tractor while in any gear, it stays in fine without popping out. If I am in gear and depress the clutch and move the shifter as fast as I can, it can switch form 1st to second or visa versa with no grinding, but if i'm too slow it will grind and I have to shutdown the tractor to shift it into gear. I don't really understand how the clutch works on this system.
Is the clutch a hydraulic valve that the stops the power shuttle from engaging so the transmission can be shifted? Can someone explain in layman's terms how this setup works so I can better understand to fix it. Or does this sound like some kind of synchronizer issue?

Ive never had an older tractor like this and never a shuttle shift.
This tractor seems to have shuttle forward and reverse but no neutral, is that correct or common?

The second issue is that when I go up any incline or have a load in the bucket, the tractor appears to have almost no power to move forward in 2nd 3rd or 4th gear. The RPM's stay high, but the tractor just does not want to go. All the fluids and filters were changed 6 months ago by previous owner. Case TCH was used in power shuttle. I have checked fluid level and they appear good and clean. I ordered some new filters just to be sure.

Any ideas?

Love the tractor so far. leaky hydraulic cylinders that i will be re-packing, but pretty happy with what I have so far for what I traded for it.

If your machine is a power shuttle,It has no clutch, it has a torque converter, a 4 speed
transmission and forward and reverse hydraulic actuated clutch packs.Your no go in the
higher gears is caused by low hydraulic pressure or worn out clutch packs or both.The
torque tube sealing rings could be worn out or the torque itself is worn. The foot petal
you are calling a clutch simply opens and closes a valve to divert the oil pressure to and
from the converter.Repairs on these machine are not cheap or easy. I've worked on dozens of
them.

just place the shuttle lever in "N" to shift, no need to use the clutch pedal, also use 1st and 2nd when working on hills, 3rd is for level ground and light work, 4th is for roading only, also back off the throttle to a idle when shifting and come to stop before shifting shuttle lever, the only thing the "Clutch" pedal is for is to let you have full throttle while raising the loader when doing loader work, it is not for changing directions or shifting the 4 speed, as for repairs to me they are not bad and were Light years ahead of anything else made at the time for service, I can have the shuttle apart on on in a hour or so, but like the poster below I have done Many of them since 1966
cnt

If you can't find a neutral on the shuttle shift you either have a mechanical shuttle or you got a power shuttle that one of the clutches has an issue,sometime when the discs wear thin they can crack often a piece of disc can get jammed between the other discs keeping clutch in drive,if you have a mechanical shuttle there is only the two positions on the shift,forward and reverse,if it's a power shuttle it has three positions F/R & N,the torque tube will have pipework connected to the bottom of the radiator,there will be a filter and a control valve.
AJ

Thanks for the initial input. Things make a little more sense now with that info while going through the Service manuals. the service manuals for this machine doest do a good job of helping you narrow down your particular setup. I'll post some picture tomorrow to verify what I'm looking at.


So from what I can tell, I have a power shuttle, but it was the earlier power shuttle that did not have a Neutral position. Later S/N tractors came with a power shuttle that had a neutral detent on the control valve. I don't have the dual range transmission that came with the mechanical shuttles.

I checked the adjustment of the Brakes and clutch and they seem ok. I need to fix the pressure gauge for the clutch to get an idea of what pressures are coming out.

When driving the tractor in gear, if I barely push in the clutch activating the clutch control valve, the machine stops moving before i push it far enough to start pushing the breaks. So it seems that the clutch valve is restricting the flow for movement, just not enough to restrict movement when the transmission is in neutral.

When I put the stabilizers down on the backhoe and lift the rear tire with the transmission in neutral, the right rear tire slowly turns backwards but can be stopped with the force of just my hand. Is this indicative of something or just what it does? I'm just not sure how power is getting to the wheels when the transmission is in Neutral.

I'm searching several forums and reading a lot of threads, but my head is spinning at the moment with all the information.

If it has a pressure gauge it is a power shuttle,the manual drive did not have a gauge,most backhoes turn the wheels when on the jacks.
AJ