Stalls when engage blades in forward, but cuts fine in reverse

If in all other respects the mower is running like expected then it is most likely the switch under the operators seat that will not allow the blades to engage when no one is sitting in the seat. If the operator is under weight or the switch defective the unit will shut off!!

check the safety switches start with the one on the pedal

Check that the blade brake is disengaging. Slip belt off blade spindles and check that they spin freely. Check underside of deck for clogged grass, ropes, wire, etc.

This sounds like a micro switch, or relay issue, it is not stalling it is being switched off, if there are some relays on the back of the bulk head replace them, they are just a push fit.

motor off= deck engaed turn blade should turn motor and belt fairly easy, NO remove the belt from the motor pulley with deck engaged blades should turn freely.
most decks have breaks on the pullies so if the deck is not engaged the break will be on

check the kill switch and the wire it could be that a small piece of the covering came off and is grounding to the deck or frame there by killing the engine the jerkink of the mower maybe whats causing the wire to come into contact with metal..good luck

You may have a short in one of your safety switches. There is usually one on the seat that shuts it off if you try to get up and one on reverse if you try to back it up. I would look there to see if somehow they are grounding out

If you can get it where you can grab the blades, check and see if they float easy. You could have a seized bearing on one of your blades that is stalling out the motor as well.

Hope this helps

mower stalls when you engage to cut.

This is a lawn mower catagorized as a chainsaw. We don't answer lawn mower questions ands you don't cut down trees.