Mahindra 7520 tractor with loader Dealer replace engine under warranty at 157hrs. Since engine was replaced the rear lift arms has not worked. I've checked all remotes and they have 2600 psi.

That sounds like the clutch plates are stuck together.
Strip down the clutch, repair/replace parts as needed.

This seems to indicate oily fan belt (4) - needs adjusting or replacing (3).

https://tractormanualz.com/mahindra-blink-codes/

Videos and Manual

https://www.google.com/search?q=mahindra+emax+22+blink+codes

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Well it says it is easy. I reckon you are looking for latches.

https://www.mahindrausa.com/fckimages/pdfs/series-tractor/New_2600_Brochure_FINAL_2.pdf

EASILY SERVICEABLE > Servicing your tractor has never been easier. Hood and side panels open quickly and efficiently with no tools required, providing ease of access for radiator, battery, filter replacement, and oil checks.

Or. Phone and ask

https://www.mahindracanada.ca/--byo-2645-shuttle-cab

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dealer --tractor shop --online search for repair manual

go see a dealer of your make

Check out http://www.tractordata.com/farm-tractors/007/6/1/7612-mahindra-4550-attachments.html which may well have your answer.

Try replacing the radiator cap with a lighter/lower pressure one. Too much pressure from the higher temp cap is causing it to get TOO hot and making it lose coolant. Causing it to overheat. Be sure the radiator catch can is good and connected to the fitting under the edge of cap with a hose/tube. The catch can will capture the coolant that comes out when to operating temp and coolant will go right back to the radiator when engine is off and cooling down. That's the way it works.

I would say you have air in the hydraulic system or you are low on Hydraulic fluid, I am not sure of the procedure on this make to bleed the air out but a dealer may help you if you ask nice.

Don't know about bypassing them but check this thread:
Mahindra 2004 2810W Glow Plugs Not Working
Mahindra 2004 2810W Glow Plugs Not Working