</font><font color="blue" class="small">( I wouldn't use something that heavy on a weekly basis on a little Yanmar in fear of tearing the lower lift arm pins out of the axle housing. I have seen this happen.
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I would imagine except in the case of shock loads, that these tractors lower lift pins ( cat 1 )are more than rated for enough weight to make the front end come off the ground, regularly. That is why most tractors have a rail style front bumper for suitcase weights. Your real weak links inthe lift system would probably in the connecting arm between the lower and upper lift arms, and the pins that go through the clevis to attatch the link arms to the lower lift arms. For what its worth, I frequently moved dirt with my 1700 and 30" scoop. I could easilly load the bucket with enough weight that when i pulle dthe 3pt lever, the scoop wouldn't move, and the front would go up. After adding 280# of front weight, the problem disappeared. At one point though, i did snap the adjustable lift link connecting the upper and lower lift arms. I figured it would eventually.. as it is the smallest load bearing part in the lift system... just made sense that that is where the fault would eventually occour.
</font><font color="blue" class="small">( . I do lift the mower to go over the driveway and )</font>
I think that is the key to the discussion.. even if the mower weight is fine during mowing.. if it is too heavy to steer during transport, that is where the need for the front weight factors in.
Soundguy