Ford 2810 hydraulic fill point

[Dustypp]

Looking for the hydraulic fluid fill port on a ford 2810 pretty sure it’s the grey square plug above the top link

 

[seville009]

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Oil & Fuel - 2810 Hydraulic level

How do you check the hydraulic level on a 2810 model. I was told there was a sight glass on the rear end. however there is not one. I have what appears to be a rubber plug with a screw in the middle of it to tighten. I purchased this tractor new and have not removed any sight glass.

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