</font><font color="blue" class="small">( Aren't the lift arms meant to support the weight ? (It's within the 3PH lift specs for the tractor as listed in the manual) )</font>
Tom, I think you are correct. The Class III tractors have a relief valve built right into the lift cylinder to allow pressure relief due to high shock loads. That pressure is about 3,600 lb on my tractor, I'm not sure what it would be on the Class IIs, but it is at least half-again the lift capacity of the 3PH. With your ballast box you should never experience any stressing of the hydraulics, even if you hit a bump and transmit a shock load to the arms. /forums/images/graemlins/cool.gif