720 diesel clutch or gear problem

Howdy,

I have a 720 diesel and when going downhill in any gear it will act as if it has popped out of gear, free-wheeling down the hill until it reaches the bottom. At the bottom it will pick back up again and continue moving at the speed it was at the top. All this without me touching the clutch or gear shifter. Any ideas as to what is going on? Thanks in advance.

--old fashioned farmer
 
Engine RPM change any ? Maybe just the engine running away ?

If it was a gear it should not recover I'd think so then it must be somehow the clutch slipping and gripping ? Will it pull a heavy load the way it is now on the level ground ?
 

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