Hello. I have 1980 1618 power king. I went to move a log with the loader that I could previously move no problem and now it does not lift it. You can get it off the ground about a foot if you tap the up controls quickly. I haven't been able to find a filter or a screen so I guess my next check is going to be the system/relief pressure. Does anyone know what the pressure is supposed to be or have any other ideas? Thanks.