What is it?

[Fjordman]

Changing the trans, hyd and diff fluid today.

I saw a flat plate with 4 bolts attaching it to a boss cast into the tranny
case that I haven't noticed before. It has what looks like a sheared off cotter pin sticking out of a hole in the center of the plate about an inch long.

I don't want to remove it before I know what it is (any ideas). I'll try and post a picture of it later.

Thanks,
Warren

 

[Bern]

I'll assume you're working on an industrial tractor with the torque converter transmission, such as a 555 or similar. The plate allows you to access the system pressure tube and fitting for pressure testing. The cotter pin is sometimes referred to as a jiggle pin. This keeps the hole clean so that any oil leakage that accumulates in the housing can drain out rather than fill up the cavity.

 

[Fjordman]

Ok thanks, Info left out:

Tractor was an 801 w/SOS when I bought it. Tranny went out after 2 seasons and swapped it with a 5 speed from a 901 (not sure what year).

Here's 2 pictures #1 if looking up from the floor, #2 is taken from the right side (flash light is on the floor).

Does the previous comment change after adding this info?

Thanks again,
Warren

 

[Fjordman]

 

[Bern]

You won't find a pressure test port under the plate, however the cotter pin performs the same function as I described earlier.

 

[shaun wallace]

That plate and cotter is on all 55 up transmissions as drain for oil/water .

 

[Fjordman]

Ok, thanks for the input. I'm not sure why I never noticed it before. Man was the fluid dirty!

Thanks for the help.

Warren