Oil & Fuel JD 790 Transmission Oil Change???

[Gunfighter]

I have a JD 790 purchased new in 2001, it still has the 91 cu in 30 hp engine.
The owner's operators manual is copyrighted in 1998 and it does not agree
with where the oil drain is located on my 790...

The Manual shows the drain to be between the two final drive housings ahead
of the draw bar attaching points. There is nothing there, it's nice and smooth.

I appreciated any advise.

Thanks in advance...

 

[regor66]

I have a '04 790 and there are 2 drain plugs for the hydro. Both are horizontal and are about 1/4 way up the rear end housing. you can go to the JD web site and look at the parts manual for your tractor by serial number for a better picture.

 

[gordon21]

This is where the 2006 drain is.

Lay under the tractor. The drain plug is on the right side directly across from where the big hydraulic hose comes out of the tranny on the left side. It appears to be a common pipe thread plug similar to the ones used for galvanized water pipe. The threads are coarse. The part you attach the wrench to is a square similar to the ones used on lawnmowers. 9/16" if I remember right. Have plastic buckets ready. There are four gallons to drain. make sure you have 4-5 gallons of new fluid ready. A 5-gal bucket will NOT fit under the tractor. The filter is easily accessible.