Hard to find any info on this 615 Diesel 2nd Generation . I have the Industrial Shop manual and it does not show anything on the front mounted pump and loader and valves and nothing for the backhoe and related parts. So my front pump is dripping hyd oil and was wondering if anyone has seen this pump before? I know AC did not make their own pumps and so there are numbers stamped on the flange and there is a W emblem or maybe a M is all I see. It has a standard 2 bolt hole flange like Cessna pump. Also I was wondering if its a simple geared pump or a vane style . I looked it up on Tractor data as a 615 Industrial and it says that the different variants for this backhoe is the D15 Ag tractor and the 160 model. Its a big pump and was wondering if the 160's used the same pump if they came with a loader? My hyd repair guy says he has seen these before and can get parts but would rather find one used ? What info I did read somewhere said it was a big volume pump