That cover you see may hold a dust/wiper seal but not the high pressure seal. You will need to clean everything up around the valve spool. Then remove the linkage and then that cover. The valve spool should then pull out the top of the valve. Be careful as there should be springs under the spool. Keep track of where everything goes. The spool may have orings in the valve body bore. These would usually have flat backup rings too. Your valve may not have sealing rings on the valve spools. Many valves depend on the fit of the spool/housing to keep the oil sealed. If your valve is that way then you will need to replace the valve section complete.
What brand of back hoe is it??? You should look at a parts diagram before tearing into it. If there are not seals then if you remove the spool it may leak worse. If there are not orings/seal then I would wait until I found a replacement valve section before I tore into it. You could make the old valve unusable.
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