Ditto SkipMarcy's post.... On my 5035 HST, it is on the right side of the big trans/rear end case held in place by four bolts. There may be a big hyd line [ suck'n the mesh strained fluid out of the sump ] coming from it, too. If you never have had it out before, you will probably find lots of weird filings and the mesh will be coated with a grey scum... from the breaking in of all the gear surfaces... Make sure you notice this fine grey stuff and clean the screen religiously. Also, look around for more drain plugs than the manual tells you to remove. They all have magnets that you should clean before filling it back up. On the 5035, they were all 1/2" NPT plugs with square heads. I painted mine all red so I would find them easier next time.