Hydraulic system of Bobcat 642b

the hydraulic temperature sender is typically located near the hydraulic oil cooler or the hydraulic tank. It may be mounted on the side of the oil cooler or tank, or it may be mounted on a hose leading to or from the cooler or tank.

Fluid level? last time fluid and filter changed? Color of fluid? I'd guess the hydraulic pump is not getting enough fluid due to level or blockage. Possibly a crimped hydraulic line. Could also be a Bad wheel bearing or gears or lose Hydraulic motor so gear is not in proper position.
You "may" be able to find manual here: https://www.manualslib.com/
Or: http://www.manualsonline.com/

The hydraulic system is the problem either the PTO is leaking or not pumping this controls all of the switches lights .Check your fluid levels and all filters in line look for leaks

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How to Replace Hydraulic Hose

You should use hydraulic oil, not diesel, drain it, refill it and if necessary bleed all the air from the system (some are self bleeding) Dependant on the type of hydraulic system you may have damaged the seals by using diesel oil, that, unfortunately is expensive.

That's one of the first things that came to mind as I was reading through your post; that the system was air-bound. Are there bleeder valves on the system?

In any event here is a website where you can buy the service manual for your skidsteer; https://mypowermanual.com/shop/bobcat/bobcat-641-642-643-skid-steer-loader-service-manual-download-6566135-10-86/

a bobcat 642 has hydraulic parking brake , if the switch does not high light when pressed could be its bad if switch hiltes but unit still moves then hydraulic solinoid is leaking by or in rare cases your hydraulic axle motor has leaking seal (look on gound where machine sets overnight)

its hard to get maintenace manuals you will have to try john deer online or a dealer may let you look at one

for quite a few different motors you can buy strengthened conrods or if you are referring to hydraulic CLUTCH rod the clutch system might need changing as you are getting too much pressure in the clutch or brake hydraulic system