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The gearbox is its own reservoir. There are free downloads for manuals in the sticky section. Or running until failure is always an option

Yep! What he said. Plan on at least getting a head or more

Yes the hst can cause your engine to overheat. There's an oil cooler at the filter. If your oil is excessive hot it can overcome the engine cooling. Get a laser heat gun and check the different locations for heat

By gearbox i mean the gear transmission attached to the hst. It has its own separate oil reservoir and no filter.

Zetor made in Czech Republic. Belarus are made in minsk belarus but they sold a bigger 4wd made in Ukraine and another even bigger from Russia. All still available and parts.

Purchased a 20 year old zetor. I'm impressed good tractor. 100 hp loader and bale grapple.

Check the oil level in the gearbox? Has the gearbox oil been changed? Check the driveshaft to the front diff and check the oil level in both diff and the outboard hubs.

New tires on the brown truck. Ended up with the same tire kubota uses but different size. The itp tires are failing side wall cracks

What brand and name are on the new kubota rtvx1100c? Pictures please?

It's really not a throttle dampner it is for the hst to help prevent the sudden stop if your foot slips off the peddle. My advice is either leave it or remove and throw away and get a coast valve

The tank under the seat is the common reservoir for the hst the power steering and the bed lift. The gear case is it's own reservoir and has no pump or filters. The gear case is splash lube.

The only oil cooler i am familiar with is in front of the fan mounted on the water pump.

Take the wire off of the sender and ground it to the engine does the fan run? Ground it to frame? Any difference? Does a relay click when you do this?

https://fuseboxinfo.com/index.php/machines/107-kubota/5429-kubota-utility-vehicle-rtv-x1100c-fuses

https://www.nettractortalk.com/forums/threads/cant-find-cooling-fan-relay-2011-rtv1100c-found-diagram-with-no-names.19685/

Take out relay and jump 12 volt from the relay plug to the wire leading to fan motor... if fan runs then check the 12 volt supply to the relay plug? If that passes swap relay with another and test again. If that fails you have a bad ground or the wire from sender to relay plug is bad ..

If your charge pressure is low it will still move but sluggish. I have heard of some losing prime or the charge pump not pumping then no movement. To test the charge pump you need to make up a Guage to test.

release all brakes and place gear selector in neutral it should roll relatively easy with engine off. Then again with engine off and brakes released put gear selection in low and try to push it,shouldn't roll easy. Put it in reverse and in high then repeat. It shouldn't roll easy at all. If...

Examine the thrust bearing behind the swash plate for plastic cage degradation. Check the charge pressure,max no load rpm 3800 and set the hst peddle relationship to spec. Should be ok

Yes that valve plate is worn bad. Probable cause is lack of maintenance and water build up in the hst drive oil. Change hst oil with oem fluids and filters at least once per year. Especially on low hour stop start machines