Very common for all the Stanadyne Roosamaster D series until 1985. After that, a different updated dampener is used.
Complete seal kit with new pellathane dampener is $15. It takes an hour, start to finish, to take the pump all apart, fix, and put back together.
Most pumps, by the time that ring falls apart, need a few other hard parts. Total cost is usually less then $50.
Sending to a shop, in my opinion, has always been way overpriced. These pumps never get truly rebuilt, just patched up and often a $500 - $600 repair bill gets you $30 in new parts and an hour or two in actual labor.
Replacement parts are available for sale to anyone and shipping is fast when ordered from the right place.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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