I have a large cement pad with a gravel driveway. No leaks when the Model 49 snowblower rides on its skids on the cement but when I raise the skids about 3/4 of an inch off the ground with the hydraulics to do the driveway, the power steering cylinder leaks a few drops every so often. No leaks any other time. Is this normal with snowblower in a slightly raised state or do I need a new seal? Obviously I could adjust the skids higher to do the gravel driveway but then I would leave too much snow on the cement pad. My plan was to leave the skids adjusted for cement and just use the hydraulics for the driveway but now have minor PS leak.