[Deano46]

Does anyone know the size of allen wrench to open the gear oil filler plug on a John Deere 60 inch deck gearbox on a 455 (part number 143310 or de19086)? The set that I have doesn't have a allen wrench big enough and before I went to the store to buy one, I would know exactly what size to buy. Thanks!

 

[12ultra]

I do believe its 3/8 allen

 

[Cubcadetmax]

On my 425's 54" deck, the size is 8mm. I bought this set from Amazon:

https://www.amazon.com/gp/product/B0020DU622/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

 

[Zebra5]

I suspect they are very tight. Some one stripped the hex in mine (bought used) and I had to drill and use an "ez out" to remove it. I wanted to check the level and the change gear lube, so I would know it had been done.