Oil & Fuel 2003 BX23 -- UDT fill plug location

   / 2003 BX23 -- UDT fill plug location #1  

scirocco

New member
Joined
Nov 16, 2025
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2
Tractor
BX23 and P-D 218
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
  • Thread Starter
#4  
Thank you very much TMGT! Indeed that thing is near-invisible.

Not sure why I thought there weren't going to be small changes over so many years.
 
   / 2003 BX23 -- UDT fill plug location #5  
No problem, they did make it confusing by having a 23 and then going back to using the 23S designation 12yrs later.

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