There is a restictor that must be adjusted to match pump output and the weight of the implement. In thory the pump should &quot;push&quot; the implement down, not the weight of the implement. Interesting you only have a single unit hydraulic system&gt; I know they were used on the 17 &amp; 1850 special tractors. Do you have a book? The adjustment is covered in the operators manual. The adjustment screw is located in the top cover above the rear port. It will take a screw driver and a 9/16 inch wrench. Have the tracto running at the speed you will be tring to lower the implement at  and turn the screw in till it lowers smoothly.