7120 not moving

A friend has this 1988 7120 mfwd he was using it and stopped when he went to go again there was a no go, not moving in forward or reverse, what could be the issue and where do we start diagnosis thank you
 
I had that happen once on the left side inside the control valve there is a actuating cam that has a small roll pin in it, could have sheared, that is what I had found on mine it is a very lite duty roll pine, I replaced it with a regular pin. Bob
 
Does the power steering and hydralic's work? If not the drive disc on the flywheel may have failed or else something in the hydralic pump drive failed
 
Probably going to have to get a service book and do some pressure tests or find a dealer that has a tech that can do it for you
 

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