Bowl does not reach rated speed or takes too long
Westfalia OSA 7, self-cleaning centrifugal oil separator (lube oil purifier)
Possible cause
Brake on, wrong motor connection, oily or worn clutch shoes, too few shoes, bowl rubbing the centripetal pump, sludge in upper frame, worm wheel slipping
What to do
Manufacturer's manual, p. 58Release brake, check wiring, dry or renew clutch shoes, add shoes, reset bowl height, clean the frame, tighten worm wheel clamp screws
See the assembly on the 3D model
Other Westfalia OSA 7 faults
Bowl reaches speed in under 2 minutes, high starting currentToo many clutch shoesSeparator runs unevenly / vibratesUneven sludge, wrong assembly or mixed bowl parts, slack disc stack, damaged bowl, weak neck bearing springs, broken bottom bearing spring, worn gearBowl fails to closeClogged feed ducts or discharge nozzle, dirt in opening chamber, damaged gasket in sealing-chamber bottomBowl does not open or opens only partlyToo little operating water, clogged strainer, leaking line, dirt between piston and bowl, loose polyamide gasketIncomplete de-sludgingBowl closed too soon, hardened solids, enlarged piston discharge hole, slack disc stackBowl opens by itself after long separationOperating water in the sealing chamber evaporatedDirty oil at the clean oil outlet (bowl overflow)Rust and heavy impurities in the distributor neckOil in the water dischargeRegulating ring too largeWater in the clean oilRegulating ring too small
From the manufacturer's manual “NEW ME L.O PURIFIER MANUAL.PDF”. Check against the original on board before work.