Beisler 739-23-1 Service Manual - Manual (Page 42)

5.1 Oil circuit
The oil runs from the oil tank 1 to the oil sump 3. From there, the
lubricating points in the arm and head sections are provided with oil.
The oil emitted from the crank mechanism flows via the oil wick 2 to the
oil sump 3. The excess oil is pumped back into the oil tank 1 by pump
4.
Caution! Risk of injury!
Switch off main switch!
Carry out installations on the oil circuit only when the sewing machine
is switched off.
CAUTION!
Ensure that the hose ends are properly re-connected to the pump.
S=Suction
D = Pressure
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