http://www.wagnersteering.com/steering-700-series.htm
They are still in limited production and are made in BC Canada. They were used in a lot of the trawlers made in Taiwan in the 80's. Other than the seals going bad from time to time, they have a good reputation. Mine were installed in 1980. They seemed to function well. I removed the pumps from the upper and lower helm.From the rear of the pump inside the helm, The three hydrolic lines unscrew with a 1/2 wrech. The pump is held on the helm with a 7/16 bolt sitting on a 1/2 nut on tow studs that come in from the front of the helm in a bracket.
This is the rear view of the pump. Two large screws hold on a manifold. Remove this first.
There are two ball bearings inside the pump under the manifold. They will fall out if you invert the pump over a paper towel to catch them. On the pump there are three o rings, one for the shaft the other two are oval shaped sealing the oil inlets/outlets. They will be replaced.
Next I opened the pump with a 1/4 hex wrench. One was only finger tight.
Next I opened the pump using a paint scrapper and mallet. A wack in between the flanges on one side then the other will split right on the gasket area.
When the gasket gives up, the piston springs may cause the barrel to spring out, not too bed but be ready for it.
Here is the housing on the left and the barrel with the pistons on the right.
There is a three part bearing set at a angle in between the barrel and the housing. When the pump rotates, the bearing actuates the pistons. Notice the rust on this bearing, If I can get a nre one I will. It may be used again, this not a transmission and the tolerances are not as great.
Here is the parts all layed out.
This is the seal kit. I got it from
