Do you have the manuals for service?
If not please, PM your address using the are under your profile on the forum.
1. Remove belly pan/screen.
2. Pull off front grill.
3. Remove engine side green covers.
4. Disconnect battery, remove it.
5. Remove battery pan.
6. Remove hood/front hood support together (4 bolts down on front frame), Disconnect yellow wire (headlight power), black ground from heat shield
7. Disconnect front PTO wires (purple wire, black ground wire (maybe anchored to engine mounting bolt), Remove PTO (requires use of puller)
8. Use a wire (I use a metal coat hanger opened up) to support drive shaft. remove 4 bolts from coupler/flange to engine.
9. Remove 4 bolts holding engine base to mounting plate/frame
10. Shut off gas, remove the feed hose from pump, cap the hose and pump (safety)
11. Disconnect wiring: (Ground to engine, separate engine wires (3 prong plug).
12. Begin to lift engine out (use either lift or another strong person to help). After you get it up a few inches, put blocks under the engine. disconnect the red battery cable from starter, and the ignition wire on solenoid. ( if you find that the nut just twist, you may have to work the red cable back out from the firewall, that is what I had to do), then haul it away, place on strong support (be careful of the oil drain, it hangs lower, thus it can be broken out of the base).
Clean and inspect the engine while it is out, I just found a leak on my oil pressure switch, it is the second one to go bad, this one lasted about 10 years, first one 20 years. Clean the frame of the tractor! Take care of any rust in the area (remove the rust, treat the rust, repaint, use black semi gloss)
While you have fly wheel off (requires use of a puller), There is a magnetic collar that the trigger senses to fire the engine. If the plastic is black in color, replace it. The newer ones are grey in color. (thank you boomer_influence) The black one has a defect, magnets tend to pop out.
Also replace the pulser fuel pump line to the vacum port, if you haven't already or not sure if it was ever done. Saves pulling the engine again. Remember these are 25 to 35 year old engines
Reverse the steps to put back in.