Have seen this destruction MANY times in my Gen8 test pigs
Several issues I have picked up are:
Spring flex, especially with those unequal length springs!
THIS is why I use equal length springs in my high pig builds.
The spring retainer guide cops extreme loads when the springs flex, and is clearly shown in this pic;
Unequal springs that have this tight winding, just before the spring guide, are a recipe for disaster
At this exact point shown in the pic, there’s only the single spring wire supporting the load of all of the coils in front of it.
At this point of compression, the spring is try to bend ANY direction except straight back!
The only direction it can flex, along with the piston, is up or down. The piston rails retain any side movement quite well, but not so great in resisting tilting
When the spring flexes at this precise moment, the piston/spring can lock up right at the tip of the retainer guide and BOOM…takes out piston racks, strips gears, hammers bushes/bearings and slams the spring retainer.
The poor 2 tab style retainers have a bad design flaw in trying to contain the constant VERTICAL flexing loads of the springs. The tabs are retained on the HORIZONTAL plane, which those higher spring loads can cause the retainer to pivot vertically within the housing
I have overcome this in the GEN8 pigs by converting to the metal buffer tubes and Bolt Thru retainers. This definitely has stopped ANY pivoting of the retainers within the rear of the gearbox through adding a much stronger anchor point for the retainers
I think manufacturers cottoned onto the issue after a while, most likely why the Bolt Thru buffers started to be introduced
Modern designs, such as this CYMA are obviously much stronger and more stable when it comes to reducing pivoting of the retainers by eliminating the horizontal/vertical pivoting planes.
I could, and have, written another novel length reply here somewhere else about vertical loads from the spring being transferred through the piston rails, causing them to rise up against the top of the gearbox, lose meshing with the sector gear, also locking hard up against spring windings…this causes total destruction as well
I love it
There’s soooo much more I have documented with the Gen8’s over a long time, But I’ll leave that for another day