I'm not sure as to what may have happen over the 3 years period of using the FEL, but at first when installing it there was a limit to how much weight it would lift when I could hear the pump start wining, (was around 500 lbs) or if forcing to dig more than it should I would hear the pump and back off and lighten the load, Although now it seems to have the ability to lift more , 800 lbs and the pump doesn't make any noise, it simply just won't lift the load if its too heavy, however I can rev the engine on up to have the pump spin faster and it will then lift it, but still with no noise sound from the pump, this would be considered in an adjustment of the relief valve but I haven't adjust anything, it still as it were since day one of the install of the FEL, I feel I should re-adjust it back to having limited to only around 500 lbs otherwise I'm risking damage to the tractors front end components etc,etc,