Just to add a little here, I have a 1963 Dynahoe Backhoe Model A that uses a very similar header input on the rear stabilizers or outriggers. The header input is very close in both size and dimension to header input or bulkhead, (not sure of the right terminology) on the AC 715 backhoe. The shape of the header input looks like a quarter moon that is a weldment at about the half way point on the rear stabilizers or outriggers. The " header input" or bulkhead on the hydraulic cylinder that is mounted on the Dynahoe is very similar to the header input on the AC 715 loader backhoe as is the end cap. The AC 715 that I am working on is a very late 74 model so these header inputs were apparently an industry standard at one time. The half moon shaped header inputs or bulkhead allow the 2 wire hydraulic hoses to connect the supply and return flow of hydraulic fluid to the cylinder or stabilizers.
Am wondering while typing this if maybe Bucyrus Erie was involved in making the cylinders and were supplying the industry during the 60's and 70's? I know Bucyrus was involved in hydraulic designs for hydraulic cylinders as some of the very old International dozers had Bucyrus lift cylinders with the Bucyrus- Erie name embossed on the external fascia of the hydraulic cylinders.
Thanks for any insights ~ Orangeman
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