? about PTO hydraulic pump.

Hi all. New guy here. I have an HD-11 that has a large PTO pump, and I was wondering why you would mount a pump at the rear instead of just running lines from the main pump. My first thought was to get more flow, but I wouldn't expect that you would operate the blade out front and a towed implement at the same time. This was a farm machine. I'm thinking about pulling the PTO pump since I want to mount rippers on the rear and the pump and tank are so large it's tight on space.

Yes, I have a blade on the front powered by the front pump. The one on the rear was a seperate pump for farm implements.

Ages Cat wrote: The early ag tractors used the BG hydraulic pump system as there was not a crankshaft driven pump in front.  CAT, Allis Chalmers, IH all used the BG system. It was self contained as the reservoir, valves, pump and control levers were all part of the unit.

Forest, can you post some pictures of your blade with the front hydraulic system? Is it original AC or after market?

Forest, NICE SPECIMEN!. It's a 1956 year model if you didn't know. In later years  S models were typically farm tractors with the hydraulic Begee unit on the back like yours and with out the hydraulic hardnose and pump in the front. It's all original AC parts though. It may or may not have been installed when it was new,but it was all interchangeable at any time (we've done it). As Ray stated the front mounted hydraulics would run the rippers normally.  There was a diverter valve that was in the line to allow you to run the blade,tilt cylinder or rippers, depending on what your options were. I could post some pictures to show you some of the options on the 11s that we have, but I would need to see a picture of the front of your tractor to see if the oil tank and valve are mounted  in front of the radiator or up on the right side of the tractor where you can't get into the operators station. That was done for only the first year or two before mounting it all in the front. While your at it you might as well post some engine pictures so we can see if it's still a Lanova style engine or was updated to direct injection. If your brain dosen't get overloaded after all of that and you want more we'll move on to pinion cap issues to look for. Nice specimen!!!  Mel

Forest, here is a picture of a early AC system with a diverter valve mounted on the side of the hydraulic tank next to the main valve.They only used this system for the first couple of years before they put the valve and tank in the front of the radiator but still had a remotely operated diverter. Without seeing it I assume your tank and valve look similar, but with no divereter valve. The HD9s and early HD11s used 1/2'' NF bolts on the intermediate pinon caps. On construction  and logging tractors they would work loose causing all kinds of problems needless to say. It wasn't near the problem on farm tractors. They were later up graded to 5/8''NF which solved the problem. I think your tractor should be the vintage that has the 1/2'' bolts and should be monitored often.