Small Engines (Lawn Mowers, etc.): Craftsman riding mower engine stops when blades are engaged, oil levels, kohler engine


Question
I have a Craftsman 'Garden Tractor', model number: 917.273070. It has a Kohler engine (model number: CV22S, type number: 75534).

The engine starts fine and will run without any issues in all gears. However, immediately once I engage the blade clutch the engine begins to stall. If I place the blade clutch back into disengage before the engine stalls completely the engine will recover and continue to run.

I thought it may be the seat safety switch, so i replaced it but that did not fix the issue. Thinking the new switch might be bad, I jumped the safety switch harness with wire but still experienced the engine dying upon blade engagement.

I have checked all the pulleys on the deck and they are fine. The blades do not have any obstructions and can rotate 360 degrees.

Oil levels are fine, fuel is fine and solenoid is brand new.

Any additional thoughts on troubleshooting this would be appreciated.

Answer
I think you are on the right track with an interlock system malfunction.  Disconnect the ground wire on the engine,  (the small black wire from the ignition switch) you may have to disconnect from the coil.  This will isolate if its an interlock problem or an engine problem

Send me an update and let me know what you find