SINGER 251 - Manual (Page 6)

LUBRICATION
TURN BACK MACHINE
NEVER ALLOW
OIL TO FALL
BELOW LOW MARK FILL TO
HIGH MARK
Fig. 5. Oil Reservoir Fig. 6. Oil Flow Window
Machines of Class 251 have an automatic lubricat­
ing system in which oil is circulated by means of a
centrifugal pump from a reservoir in the base. X-Ray
view of machine on page 2 illustrates automatic cir­
culation of oil in this machine.
BEFORE STARTING THE MACHINE the oil reservoir
must be filled with "TYPE A" or "TYPE C" OIL, sold
by Singer Sewing Machine Company. "TYPE C" OIL
is used when an oil is desired which will produce a
minimum of stain on fabrics, even after a long period
of storage.
Tip the machine back on its hinges and fill the oil
reservoir as instructed in Fig. 5,
When a machine is NEW or has been idle for several
weeks it is advisable to remove the face plate and oil
the needle bar and take-up bearings. Oil the hook as­
sembly by hand and check the oil flow, as instructed
on page 7. The automatic oiling system will function
efficiently, after the first few minutes and continue to
lubricate all bearings.
When in operation, the oil level in the reservoir
should be inspected at least twice a month or as oftei^
as necessary, to keep it from going below the LOW
mark, see Fig. 5, in the reservoir.
CAUTION: Correct lubrication is indicated by a con­
tinuous stream of oil passing the oil flow window
while machine is running, as shown in Fig. 6.
Should this oil flow become erratic, STOP the ma­
chine and do not run the machine again until the oil
flow has been restored.
At least twice each month check the oil level in the
reservoir.
Never allow oil level to drop below LOW mark,
shown in Fig. 5.
Oil your bobbin winder occasionally by applying
a few drops of oil to the oil well in bobbin winder,
as shown in Fig. 15, page 12.
See instructions, covering Oil Removing Wick As­
sembly, on pages 38 to 41.