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Fixed - Sort of

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Brian Piccioni

06-07-2009 18:48:33

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JMS/.MN said: (quoted from post at 01:23:26 06/08/09) I"ve had a 720 since 1980. The trip assembly is designed for it to trip either of two ways- it can stay parallel to the ground and ride straight up over shallow rocks- that is what yours has done...or it can trip in the conventional manner where the point catches on a big rock and the bottom flips up and over the rock. In your position, the springs should be tipped forward. DO NOT WORK BEHIND THE BOTTOM! I think you could safely release tension by unscrewing the two spring bolts from the front side of the frame. I would stand on a box on the front side of the frame and carefully reach over, if I could not attach a chain to the standard, anchor it, and pull ahead. You do not adjust trip tension by those two bolts- there is a small lug bolted within the trip mechanism that does that. Both springs need to be tightened down (bottomed out) upon reassembly. I would look for some worn, bent, or missing linkage parts so this does not happen again.

Based on everybody's comments I sort of repaired the plow.
I put 2 pieces of 6x6 under the blade so there was only about 1/2" gap.

Then I relieved the spring tension (nice to have an impact driver)

The spring assembly fell away, and the blade was still stuck 'up'

I was able to wiggle most of the components, except a "main spar" which hinges on a 2" or so diameter pin.

So I removed most of the pieces and the spar still wouldn't budge

When I got the plow, I noticed one of the disks was damaged so I had removed one blade + disk, so I was operating only 3 blades (2 with the one stuck up).
So I decided to rebuild the plow with the damaged disk using the parts of the stuck one.

This was relatively easy to do as I was able to use the loader of my small tractor as a crane.
Long story short, after a couple hours or so, I am back in business. Now that the unit has been removed, it is obvious the problem is with the great big hinge pin on the main spar.

I'll try remove it with heat and or a hydraulic press or I may end just cutting the plow down to 3 sections. It looks pretty easy to do and I have enough trouble plowing as is. My tractor has plenty horsepower, but even with ballasted tired I can't get enough traction most times
Thanks again, everybody.

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