I have a customer TH514 with the same issue the customer claims they broke the pins 3 times I have a call out to Cat no response at this time, I will keep you posted on the response, it seems the weak point is at the retainer bolts that go thru the bosses we checked pressures at the barrel and rod ends at relief 3,500 psi. if I don't get a response from Cat I think the solution is to get a pin long enough to go thru the bosses and don't drill a hole in the boss for the retaining bolt just have the end of the pins drilled for oversize washers just like the boom pin on a excavator I will keep you posted if this works.