Oil & Fuel 2003 BX23 -- UDT fill plug location

   / 2003 BX23 -- UDT fill plug location #1  

scirocco

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Nov 16, 2025
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Tractor
BX23
hello all, thank you for reading!

I've just acquired a rough, but running 2003 BX23. At least, the engine code 3Y which seems to be Dec 2003, so maybe it's a 2004 model year?

Anyhow, the Hydraulic/Trans/UDT fill plug is not where I expected it to be based on the workshop manual I found. However, the manual I have is dated 2017, so.... makes sense.

The plug on this older machine is a large plastic threaded plug right in the middle/top of the back of the case --- very inconvenient to get a funnel into, and it has no dipstick.

QUESTION: How do I know how much to fill? Besides no dipstick, it isn't even possible to really observe inside to see the oil level.

Secondary Question: Does anyone have the correct WSM for this model year tractor? Unfortnately the factory sticker on the frame rail is scraped/damaged.


Pasted are the WSM page i'm referring to, and the numbers from the machine.

Thanks for any insight!
1763297832662.png


1763297889681.png


1763297935325.png
 
   / 2003 BX23 -- UDT fill plug location #2  
I am not personally familiar with the BX machines, but transmissions without a dipstick should have a sight glass somewhere lower on the case to check the level. It's also possible (?) a previous owner replaced the OEM fill cap with something without an integral dipstick? There must be a way to monitor the trans fluid level.
 
   / 2003 BX23 -- UDT fill plug location #3  
Your manual is for the newer BX23s, the dipstick on yours should be just to the left of the fill plug when looking from the back of the tractor. It's probably gray and hard to see if the backhoe is still on.
1688292009.jpg


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