Ordnance maintenance : Browning machine gun, caliber .50, all types Page: 23
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TM 9-1225
BROWNING MACHINE GUN, CAL. .50, ALL TYPES 35
b. Guns.-(1) Machine guns, when not in use or when left outdoors,
should be protected from the weather by tarpaulin or other suitable
covers. If brought indoors the guns should be thoroughly and com-
pletely oiled immediately, because moisture condensingon cold metal
in a warm room will cause rusting. After guns reach room tempera-
ture they should be wiped free of condensed water vapor and oiled
- again with sperm oil. Special care should be taken not to use excess
oil. The parts are best oiled by wiping with a slightly oily cloth.
(2) Guns brought indoors after firing should be thoroughly and
completely cleaned immediately with dry-cleaning solvent and oiled
as above. After reaching room temperature the gun should again be
wiped free from moisture (if any) and reoiled.
(3) Bores and chambers should be thoroughly cleaned after use with
rifle bore cleaner, and immediately coated with sperm oil to prevent
rust.
(4) Bores and chambers should be wiped free of oil before firing.
(5) Sperm oil has preservative as well as lubricating properties and
care should be taken to use it wherever permissible. However, if
sperm oil is not available, lubricating oil for aircraft instruments and
machine guns may be used for short periods as a rust preventive.
This oil has limited corrosion resistance.
(6) The following lubricating oils should be used:
(a) For all caliber .50 aircraft machine guns when firing in the air
use lubricating oil for aircraft instruments and machine guns.
(b) For all caliber .50 machine guns when firing on the ground at
air temperatures below 450 F., use lubricating oil for aircraft instru-
ments and machine guns.
(c) For all caliber .50 machine guns when fired on the ground at air
temperatures above 450 F., use sperm oil. If sperm oil is not available,
use engine oil SAE 10.
c. Mounts and other materiel.-Mounts and other materiel should,
in general, be similarly treated. For buffer oil in all caliber .50
machine gun mounts, under all service conditions, use lubricating oil
for aircraft instruments and machine guns.
d. Cleaning machine guns received from storage and preparing ma-
chine guns for storage.-For proper method of cleaning machine guns
received from storage see TM 9-226. For proper method of preparing
machine guns for storage see TM 9-225 and 9-226.23
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United States. War Department. Ordnance maintenance : Browning machine gun, caliber .50, all types, book, June 12, 1942; Washington, D.C.. (https://digital.library.unt.edu/ark:/67531/metadc29982/m1/25/: accessed May 20, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.