I have a Ford 4000 1969, 2600 hrs, with independant pto, I have had her for 6 years, i have a 6ft pasture topper attached, using on keeping horse paddocks trim, this year i have purchased a haybob and have had a go a hay making , on 6 acres, borrowed a cutter, just hoping for some sunshine !! Topped up rear axel last night to find oil dripping out of brake push rod as it goes into axel, looks like seal top hat style, is this job straight forward ? any ideas, thanks