Hi Barlow, Re diff lock, continue to work on mechanism to see if you can free it up. My brother's 684 diff lock no longer works either. You can put the pedal down but it does not lock the axles. I think he has sheared the internal dowel pin(s) that lock the axles in the diff. See caseih.com parts for foot pedal mech: http://partstore.caseih.com/us/parts- search.html#epc::mr50613ar9962
Re PB lite coming on with PTO, I think you have a electrical wiring issue, short, bad PB switch etc. The PB switch is under the PB lever and supplies a ground to the circuit to turn on the light in the dash. The PTO lever mechanism runs under the back of the seat and activates a spool valve on top of the MCV just behind left foot rest. There is also one electrical connector behind the seat and under the deck plate that supplies all the connections to the rear of tractor. Also there is only one or two ground points and one is close to the the electrical connector and is on one of the bolts that holds the deck plate on. Very good thing is PB works so fix that light so no one will drive tractor with PB on. Later models replaced PB light with a flashing light.
Re transmission lube light coming on: This is activated by a mushroom like sensor that is under the seat with a single wire on it. It really has very little to do with the hydraulic pump but sense the pressure in the transmission lube line that is fed by the return hydraulic oil cooler line and the transmission lube pump. Just make sure transmission is over full by 5 gallons or so. This light sometimes comes on when transmission is hot and engine at low idle and sometimes when engaging PTO. Have had the sensor go bad as well were light was on all the time. Not much to worry about unless it is on all the time.
As other post said are you positive that you all looking at correct lights as light coming on when PTO first engaged would appear to me as transmission lube light. Light coming on in 3rd or rev could be caused by gear shift lever shorting PB switch wire to ground.
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