7045 Unknown fluid reservoir? Hydraulic return; Bleeding fuel.

Just got a 7045 to replace my burnt out() UTB. Can make sense of most things (though struggling to get the dashboard lights/guages working - I think I'm getting there!) except I found what looks like an extra brake fluid reservoir next to the air cleaner in front of the rad. The lid says "PLNTE TLUMICOVYM OLEJUM"
Google gave me " Fill with silencer oil" the first time then "Pneumatic oil" the second time???
Is this oil to lube the compressor & if so what spec oil & if not what is it for?
Two more questions please:-
Do I need to run a free return for hydraulic oil if using a back actor (backhoe) with just a pressure feed pipe to it's own spools & a free return & if so suggestions for best place (removable plug e.g. which could be tapped for a new connector)

I will change the oil & renew fuel filters once I've got it reliably charging, but I can't find any info on bleed points - does the hand primer do it all, or are there bleed screws as well?

except I found what looks like an extra brake fluid reservoir next to the air cleaner in front of the rad.

Two more questions please:-
Do I need to run a free return for hydraulic oil if using a back actor (backhoe) with just a pressure feed pipe to it's own spools & a free return & if so suggestions for best place (removable plug e.g. which could be tapped for a new connector)

I will change the oil & renew fuel filters once I've got it reliably charging, but I can't find any info on bleed points - does the hand primer do it all, or are there bleed screws as well?

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On the first question the second reservoir is for damper liquid going to the steering damper.
Second question if your backhoe has a valve chest of it's own with a feed and return pipe. there should be a return pipe on the tractor already if not there will be a blank on the back near the top link.
Third question there is a bleeding screw on the injector pump and one on top of the filter housing.

Thanks for that - I'll check out the damper & bleed points & have a look for a suitable plug for the return hydraulic oil. Can you point me at any pictures of the relevant areas?
Today after much poring over the wiring diagram & testing a multitude of cut wires & miscellaneous bits of house wire added under the dash I made some progress. I removed the regulator (Lucas ACR alternator so it's redundant) & fuse box,made some new earths & cleaned all the useless ceramic fuses before refitting the old fusebox. Partial success! - I now have the charge & oil lights coming on & going off when the engine starts, temp & fuel guages not working, but I have two fuses missing whcih I'll get tomorrow. At least I now have a reliable charging system & I know the oil pressure is OK

Thanks for that - I'll check out the damper & bleed points & have a look for a suitable plug for the return hydraulic oil. Can you point me at any pictures of the relevant areas?

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Right the return bung is near the top link on a Crystal, but on your tractor there is a bung between the hand brake and hand clutch levers.