Singer 628 - Inspection and Lubrication; Class 620, 625, and 628 Machines; Class 626 Machines

INSPECTION AND LUBRICATION
Before any extensive inspection is undertaken to
find causes of faulty operation, the machine should
be thoroughly cleaned and lubricated.
Remove lint, fluff, dust or other foreign particles
from the hook, feed dog, and bobbin case.
Remove bobbin case and clean in varsol. Open
face plate and clean out lint or waste collected
around needle bar, presser bar, and pressure regulator.
CLASS 620, 625 and 628 MACHINES
Remove arm too cover by opening stitch chart, re¬
moving screw, and sliding top cover toward left and
off the machine.
Remove arm top cover by removing the two screws
and lifting cover from machine.
Lay machine on back, loosen screws from the four
corners of the machine-bed cover, and remove cover
from underside of machine.
Wipe out any oil or grease accumulated inside
arm-toD and bed covers.
Oil machine as indicated below, and on pages
3, 4 and 5 for specific class of machine.
Apply one drop of oil between the casting and
the bobbin push-button release lever.