Had to clear a jammed pump in the middle of the night, tried a trick with a grease gun.

We were pulling silt on a river job near Paducah, and the main pump got a solid rock jam at 2 AM. Couldn't get the access plate off, and the foreman was an hour out. I remembered an old hand saying he'd used a grease gun on the pressure line to push stuff back. Hooked it up, gave it three pumps, and the rock shot right out the intake. Saved us a four hour shutdown. Anyone ever try something that dumb that actually worked?