Maybe on a BX1880… but on other..??
My M4700DT has no “dipstick” on the front axle.…only a threaded plug on the upper surface, presumeably to be used primarily for re-filling the axle.
A rod, stick, wire, or other can be inserted to the bottom of the axle-housing to gain a sense of how much oil is in there.
The WSM and the OM both specify how much oil is in the axle. When I drained the old fluid I measured how much came out. (Not a lot…maybe a quart…but the reason I drained it was to replace a leaking seal.). The amount specified for my axle is 8 qts. I used a new garden sprayer with graduations marked on it’s side… (and with the spray nozzle removed)… filled with gear oil.
I added 8 qts of 80W90 gear oil. I then used a metal rod to see how high upon that rod the 8 qts rose…and marked it. Now I have a dipstick for the front axle, kept in my “tractor stuff“ box.