John Deere LA105 Engine dies when blades engaged.

Assuming there is no safety interlock that won't allow the engine to run when the deck is lifted, and assuming it's in the down/cutting position when you engage it, and, assuming the deck is not seized-up, which would probably stall the engine, engaging the deck slowly should allow it to spin up. I've had older ride-ons that nearly stalled each time the deck was engaged, due to a build up of grass, or bad belts. Can you (of course with the engine off) rotate the blades easily? If not, you need to look for binding.

It sounds like the reverse switch try unplugging it and let’s see what happens

My JohnDeere cuts off when I engage my blades.Ive checked all switches and that’s not the problem..Any suggestions

make sure it's not in reverse, or reverse switch could be bad. I was working on mine each time i tried to engage deck it would cut off . forgot i had it in reverse

I have a GX85 that is in excellent condition had it serviced regularly until a few months ago I am getting ready to move to a senior community and will be selling all tools etc. My problem is I went mow today and engine cranks great but put the the into forward gear engine shuts off cranked it again and tried to engage the blades and it cut off any ideas. Please help. Thanks