There is only one seal and one gasket on the pump. There are a couple of transmission seals you can change while the pump is out. Pretty much anyway you do it you should have 2 people to remove the pump as it is quite heavy. Remove all pipe outlets and the handle to activate it. On an H there is a plate to remove and you can get to the drive shaft for the pump. If I remember there is a coller on each end a cotter pin. The ends are like a mortise and cut through tenon so it can only slide off one way. After that its just a matter of removing the bolts that hold the pump and drop it down. That is where you need the help. There were handles made just for the job. I have used a floor jack and had someone steady the unit as it goes up and down. Probably other ways to do it.Once out just unbolt the plate on the pump and the gasket is on that. To removed the seal the book says use a brass rod and stick inside the pump to jam the gears. The coupling unscrews opposite a normal threaded bolt. It won't come off easy.
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