Inching Pedals

How do inching pedals work on power shift tractors?

Operate a dump valve. Dumps most of presserized oil back to sump.

Is there a torque converter, or does it slip the clutches?

Depending on the make, I think it operates a valve which simply alters the oil pressure to the clutch pack.

The poster below has it right or close on a KUBOTA . That is all I am familiar with. On the larger power shift it is electronic but down stream it still just reduces the pressure in the forward clutch pack.

So it slips the clutches.

No throwout bearing, but does wear clutch material.

There is a torque converter, but the inching valve does slip the clutches.

If used properly it will have minimal effect on the clutches.

I don’t think your tractor has a torque converter as Steve has indicated, maybe he wrote that mistakenly. Now I can’t say this with 100 percent certainty but I can’t find any specs that show those models are equipped with torque converters. With wide spread use of constant or infinitely variable drive trains the use of torque converters in tractors or many heavy draft applications has all but diminished, wheel loaders may be the exception. Your tractor is likely equipped with a torque limiting clutch that is a sort of slip clutch only meant to slip or cushion harsh shifts. This torque limiter clutch is between the engine and the transmission input.To be honest newer electronically modulated power shift transmissions may not even utilize these. The inching pedal generally operates a clutch pack that is built more robust to handle the engagement to get the tractor in motion and to handle slipping when slight movement in necessary. I web searched to see if I could find an article that would help explain how an inching pedal works. It just so happened that a manual named .. POWERSHIFT TRANSMISSION SYSTEM How It Works and Troubleshooting.. popped up. It just so happens that it is for a New Holland TG series tractors, see link. On page 42 it shows inching valve operation. No sure how close this is to the drive train in your tractor, but I would think it would be fairly close.
PS manual

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9:10 marker on the video for those of you pressed for time.

No there isn’t a torque converter .