Which Bosch model VA pump do you have, AR, BR or CR? I have worked on those pumps for years, and none have ever used square section O rings at the throttle or shutoff shafts, but the old ones may LOOK like that when taken apart. There are some square section O rings on some pumps at the advance and head area. Very few parts are available, but gasket kits are so far. DGK 124 or DGK 125, depending on the pump model. CR with the line fittings straight is the later one, AR and BR with angled fittings are the early models used.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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