Renze
Elite Member
In 2005 i built this loader: http://www.tractorbynet.com/forums/build-yourself/85834-home-building-frontloader.html
3 weeks ago, the addition i welded to the boom brackets to mount the parallel rods, broke a weld on one side, causing it to kink the parallel rod as it was now supported off center by one bracket plate.
While i had everything unmounted, i decided to weld the extension to the lift cylinders too, so i could tip out further at ground level, and put the bucket edge steep enough to backdrag.
I've been back dragging some good amounts of dirt in the last 2 weeks, including using the bucket edge vertical to cut some brush roots by wiggling the bucket vertically into the ground, relying on the safety valve in the tipping circuit to prevent any damage. However, yesterday i found i have a huge amount of slop in the mounting holes of the main boom pivots. Its about a centimeter !!
Trying to figure out why this was happening, i wondered if i did smart by measuring all exact mounting points and leverage lengths, to put this data in the extensive Excel sheets we use at my work, to calculate payloader load frames...
I dont want to do that, because of the work, and because knowing exactly the weaknesses of this loader, it would be tantalising for me to not spend another thousands in order to get this right, though i dont need a 20.000 hour pin&bushing life on a farm loader...
Anyways, when calculating the surface pressure of the pin on the bracket, i realised this couldnt be the cause, the cause must be that the hole is less than a pin thickness to the edge of the bracket plate.
This morning i woke up and thought once more: Its not the surface pressure, but the combined surface pressure, and the bending moment of the extension i made to hold the parallel pushrod pivot... Just before going to church, my troubled mind
was relieved from the conclusion that this is the only cause, and not that i'm stretching the very light duty basic design of this loader, way over its limit with my use and modifications.
Solution is to take them off next week, drill new, round holes in the consoles and weld new bushes tightly in the holes, and give the bracket some 2 cm extra meat on the front side of the hole...
3 weeks ago, the addition i welded to the boom brackets to mount the parallel rods, broke a weld on one side, causing it to kink the parallel rod as it was now supported off center by one bracket plate.
While i had everything unmounted, i decided to weld the extension to the lift cylinders too, so i could tip out further at ground level, and put the bucket edge steep enough to backdrag.
I've been back dragging some good amounts of dirt in the last 2 weeks, including using the bucket edge vertical to cut some brush roots by wiggling the bucket vertically into the ground, relying on the safety valve in the tipping circuit to prevent any damage. However, yesterday i found i have a huge amount of slop in the mounting holes of the main boom pivots. Its about a centimeter !!
Trying to figure out why this was happening, i wondered if i did smart by measuring all exact mounting points and leverage lengths, to put this data in the extensive Excel sheets we use at my work, to calculate payloader load frames...
I dont want to do that, because of the work, and because knowing exactly the weaknesses of this loader, it would be tantalising for me to not spend another thousands in order to get this right, though i dont need a 20.000 hour pin&bushing life on a farm loader...
Anyways, when calculating the surface pressure of the pin on the bracket, i realised this couldnt be the cause, the cause must be that the hole is less than a pin thickness to the edge of the bracket plate.
This morning i woke up and thought once more: Its not the surface pressure, but the combined surface pressure, and the bending moment of the extension i made to hold the parallel pushrod pivot... Just before going to church, my troubled mind
was relieved from the conclusion that this is the only cause, and not that i'm stretching the very light duty basic design of this loader, way over its limit with my use and modifications.Solution is to take them off next week, drill new, round holes in the consoles and weld new bushes tightly in the holes, and give the bracket some 2 cm extra meat on the front side of the hole...
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