Probably rolled over the rear rubber cup shaft seal that rides inside the pilot tube on that pump application. Could also be the brass pilot tube ID is worn/scored at the rear seal area. Was a new brass tube epoxied in the housing when the pump was repaired? Trick to know if the rear seal is in place right, pump will slide over the lubed seal easily. If the pump needs lots of effort to get to the timing gear case, it's most likely rolled over. Most all pumps I see in for repair need a new tube due to seal wear inside.
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Today's Featured Article - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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