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Hi, I acquired a battered but working MF40b 2 years ago to help with building my house and landscaping. Had a few problems along the way, but overall a really useful machine. Now needs some restoration work. Current problem is with the o-ring seal on the hydraulic pump output repeatedly failing...

I have a 1970s MF40b still mostly going strong, but have a recurring problem with the o-ring on the output flange of the Dowty hydraulic pump. This splits every few weeks and costs me a flood of oil every time. Is this problem familiar to anyone else? Solution? Thanks for any help.