Dürkopp Adler 52 i-75 Series Operating Instructions Manual page 73

Maintenance
Operating Instructions 52Xi, 52Xi-75 - 03.0 - 09/2023
3. Fill oil through the oil filler opening (4) up to the MAX
marking (5).
Important
The released amount of oil does not change until the operating
time has run a few minutes. Sew for several minutes before you
check the setting again.
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