Blades wont ingage

Here's the link and I'm sure you will get the solution of your problem.
JOHN DEERE D140 SERVICE REPAIR MANUAL

If it acts like the blades are engaged, try tracing the wires to see where they are shorted out, start by disconnecting the wires from the switch. You may need a new switch

Check the drive belt,s for damage,also check idler pulleys and belt adjusters,I presume it,s belt driven.

Check your blade ingage switch. Sometimes they stick. You can jump start it by jumping across the solenoid switch beside the engine. I sometimes have to engage and disengage my blade switch and it starts. Hope this helps.

Hi, there is a safety switch on the deck engagement that is faulty or needing adjustment, regards Phil.

look and see if the belt came off the pulleys, it could be at the front pulley or at the rear pulleys. lower the deck all the way down and look.

just replaced some pulleys on my craftsman 42 inch cut and now the blades are ingages all the time, but it will start

If the mower drive belt is extremely loose the spring that holds it tight may have broken,check to see if it is broken before you replace the belt

On most riding mowers flipping the handle to engage the blade causes an idler pulley to engage the drive belt, which takes up the slack in the belt and pulls it against the drive pulleys. A few odd-balls have an electric clutch to engage the blades.

is it electronic engage or manually?