Geared hub ?

[nspctr1]

What is the bolt size to ck fluid level

 

[Jakob1944]

What is the bolt size to ck fluid level

I just went outside and checked mine.......A One-inch socket

I believe you can check the front right and left rear but you have to remove the wheels to have access to the check plug on the front left and right rear units......

 

[nspctr1]

Thx.