With the tractor running 1/3- 1/2 throttle, the blade would settle to ground in 30 seconds or less. To move about with the blade in the up position, I had to pull the valve handle every 5-10 seconds to keep it from scraping the ground, depending on terrain changes.
When ever the tractor is off I leave all implements in the down position as a habit.
I was hoping the valve rebuild would fix it. That leaves the cylinder or the pump?
I have an extra cylinder set up. Was thinking about switching it out to see if things would improve. However, I struggle with the idea of doing that work and putting in a cylinder which I am not sure is any better.

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70, #1 cart. Brinly Cultivator. Some wheel weights

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{125, 126, 2072-Sold~regrettably, 2284 60 inch Haban 325 deck., 451 snowblower, 2182-60 inch Haban 374 deck- "Money Pit", 401 Haban 54 inch dozer blade- rebuilt, 1440-down the road, Another 2182 for parts. Another 2284 for parts. 450 blower. 1812-sold, 2072 w/ Haban 374, and a 2182#3 w/ Haban 325}-------> All SOLD