Browning machine gun caliber .50, M2, aircraft, fixed and flexible. Page: 38
54 p. : ill. ; 22 cm.View a full description of this book.
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TM 9-225
19-20 ORDNANCE DEPARTMENT
being taken that all recesses in which springs or plungers operate
are cleaned thoroughly. After using the dry-cleaning solvent, make
sure it is completely removed from all parts by wiping thoroughly.
The bore and chamber of the barrel must be cleaned thoroughly.
After cleaning all surfaces thoroughly, apply a thin film of lubri-
cating oil with a rag to protect the surfaces.
NOTE.--Failure to clean the firing pin, the driving spring, and recesses in the
bolt in which they operate may result in gun failure at normal temperatures.
It will certainly result in serious malfunctions if the gun is operated in low
temperature areas, as rust preventive compound and other foreign matter will
congeal or frost on the mechanism.
h. Dry-cleaning solvent.--This is a petroleum distillate of low
inflammability and noncorrosive used for removing grease. It is
applied usually with rag swabs to large parts and as a bath for
small parts. The surfaces must be dried thoroughly immediately
after removal of the solvent. To avoid leaving finger marks, which
are ordinarily acid and induce corrosion, gloves should be worn by
persons handling parts after such cleaning. Dry-cleaning solvent
will attack and discolor rubber.
i. Lubricating oil.-(1) Proper oiling is second in importance only
to intelligent cleaning. Oil is a vital necessity for the working parts
but should be used sparingly. Apply oil to all bearing surfaces of
gun before firing, taking particular care to see that exterior of barrel
is oiled at breech end, also that cover extractor spring, cover ex-
tractor cam, and cover detent pawl are oiled. Oil cocking lever,
groove in the bolt for belt feed lever, grooves in barrel extension to
take bolt ribs, breech lock cam, switch, extractor cam, sear mecha-
nism, and the ways of belt feed slide.
(2) In oiling aircraft guns, special care should be taken not to
use an excess of oil, as low temperatures that may be encountered
will thicken the oil and may cause the gun to malfunction. The
parts are best oiled by wiping with a well oiled rag.
(3) Lubricating oil for aircraft instruments and machine guns
should be used on all aircraft machine guns when operated in the air,
regardless of the ground temperature.
(4) Lubricating oil for aircraft instruments and machine guns
should not be considered as a suitable preservative. When so used,
it should be renewed at least every 48 hours.
20. Method of filling oil buffer.---a. Remove the oil buffer tube
filling screws from the base of the buffer tube. Use the oil buffer
filling oiler filled with lubricating oil for aircraft instruments and
machine guns.38
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United States. War Department. Browning machine gun caliber .50, M2, aircraft, fixed and flexible., book, April 30, 1942; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc29988/m1/40/: accessed May 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.