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Standard was 20 liter per minute.
during the 2 series, a pump became available with the same outer dimensions, but with 32l/min flow. I would highly recommend to upgrade to 32 l and run it at 1000rpm PTO, with 1200 engine rpm.
If you run 1800rpm on 1000 pto to get this flow from the 20l pump, it wont last long.