It can happen due to a scratch on the pump face, or line-connector. It can also happen from a small bit of dust stuck in there. I've installed many pumps with new washers, had a small leak, loosened all the lines, let them leak and then retighten - and then all was fine.
I just had to do it with my Case 580CK. Pump crapped out last week. I pulled it off, fixed the pump, and put back on with all new steel washers. One line kept leaking at the pump. I had to loosen it twice (with engine running) and then retighten. It finally cleaned itself out and now is fine.
Had to do the same with my Deere 300B backhoe last summer. It's very easy when fixing and installing pumps - especially outdoors, to get a spec of dirt behind a washer.
By the way, new steel washers are NOT pefectly flat. They have radial sealing-ridges. That why you sometimes need a new washer to fix a leak and NOT a perfectly flat washer. New copper washers ARE flat.
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Today's Featured Article - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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