DIY Hyd Pump

[steamer]

Joe. Just to let you know there are three seals on the input shaft on the leimbach pumps. Next time you have one apart have a look behind the drive plate on the pump. One setscrew will remove it. There you will find a bushing with four center punch marks. When I repaired the one I did I drilled out the punch marks and put two 1/16 role pins in the head to get it out, There you'll find three o'rings one in the pump body and two in the head. The reason the leak is they used cheap rings instead of Viton. The other thing you'll find if you look at the gears in the pump is it's steel gears running strait on the aluminum body. I think the gears should have been bronze or brass and you wouldn't be getting the dirty oil. The blackness is the gears chewing up the aluminum body of the pump. The higher pressure will make it worse. I think if a person made up some .010 brass inserts for both sides of the gears would improve it greatly and increase the life of the pump.
Rob