ORDNANCE FIELD SERVICE
BASE SHOP DATA
GUN, MACHINE, CAL .30
BROWNING, M1917A1
PREPARED UNDER THE DIRECTION OF THE
CHIEF OF ORDNANCE
ROCK ISLAND ARSENAL - FEB.. 1943
Overhaul
B.S.D. Ne.
Ordnance Field Service Base Shop Data
GUN, MACHINE, CAL .30
BROWNING. M1917A1
LIST OF CONTENTS
Item	B.S.D.
Dismantling ----------------------------- 1
Overhaul -------------------------------- 2
Assembly -------------------------------- 3
Function Firing ------------------------- 4
No.
Ordnance Field Service Base Shop Data
GUN, MACHINE, CAL .30
BROWNING. M1917A1
LIST OF REFERENCES
STANDARD NOMENCLATURE LISTS
List of Drawings Major Items of Group A	51-10 SNL A-l
Gun Machine, Cal. .30, Browning, M1917, M1917A1, and Mounts, Parts and Equipment Tools, Maintenance, for repair of Automatic guns, Automatic gun Antiaircraft material, Automatic and Semiautomatic cannon, and Mortars - individual items	SNL A-5
and parts Small arms, automatic gun, trench Mortar and field artillery sighting equipment and fire control instruments, Major Items Sights, Bore (small arms & Field Artillery) - Parts Targets, testing (small arms & Field Artillery) Glass, Field, Type EE, 6 power parts & equip. Firing tables and trajectory charts Trucks, Small Arms, repair, Ml Gleaning, preserving and lubricating Materials, special oils, and similar items of issue Soldering, brazing and welding material, gases and related items Targets and target equipment, small arms Measuring, impression, testing and reconditioning	SNL A-35 SNL F-l SNL F-10 SNL F-12 SNL F-34 SNL F-69 SNL 0-72 SNL K-l SNL K-2 SNL L-l
outfits Ammunition, rifle and automatic gun Miscellaneous service components of Small AFtns ammunition and instruction material for Field Service Account Index to Current SNL	SNL N-9 SNL T-l SNL T-4 OPSI
FIELD MANUALS Ordnance Field Manual Ordnance Field Maintenance List of Publications for Training Defense against Chemical Attack Browning Machine Gun, Cal..30, M1917	FM 9-5 FM 9-Ю FM 21-6 FM 21-40 FM 23-55
TECHNICAL MANUALS Cleaning, Preserving, Lubricating & Welding Materials & Similar Items (Now published as TR1395-A) Browning Mach. Gun Cal..30. All types, U.S. Mach. Gun, Cal..22 & Trainer, Cal. .22 Field Glass, Type EE	TM 9-850 TM 9-1205 TM 9-1613
ORDNANCE FIELD SERVICE BUT-IJETINS Maintenance of materiel in hands of troops Electric & Oxyacetylene Welding	OFSB 4-1 OFSB 5-2
BM.-MG4
ORDNANCE FIELD SERVICE
BASE SHOP DATA
GUN, MACHINE, CAL .30
BROWNING. M1917A1
PREPARED UNDER THE DIRECTION OF THE
CHIEF OF ORDNANCE
ROCK ISLAND ARSENAL - FEB.. 1943
Dismantling
J
B.S.D. Ne.
Base Shop Data-issueOf /-мз f
Small Ai?ms 6UN, MACHINE CAL. 30' BP0WNIN6 M19I7A1	DISMANTLING	SHEET OF A
REMOVE BACK PLATE ASSEMBLY
/) Raise Rear Sight ®, Fig. /? To Position Shown. Pull
Back On Latch Knob®, Fig.2., AndRaise Cover©. PullBack
On Bolt Handle® And With A Screwdriver, Push InOn Driving
Spring Rod ®, Fig. I, And Turn To The Right A Quarter Turn.
Push © Back To Position Shown In Fig. 2.. Now Push Forward
On Knob ©And Lift Back Plate® From Slots Incasing.
BMGSOm-DISMAN-I (4)1
Base Shop Data-issueOfi-1-а.ъ г
Small Aj?ms GUN, MACHINE CAL. 30 BROWNING M19t7A1	DI3MANTLIN6	SHEET 2 OF 4
Pull Bolt Handle	Fie. I, Back Until It Will Pull Out OfHole А т
Reap Of Slot. Now Pull Bolt Assembly ® Out Of Casing.
Fig. 2
REMOVE COVER L4 TCH ASSEMBLY
(3) Pull Straight Back On
La tch ®, Fig. 2, And It Will Come
Out Of Slots.
REMOVE LOCK FRAME,
BARREL EXTENSION AND
BARREL ASSEMBLIES
With A Small Punch Press In On Pin In hole©, Fig. 2, And Pull
S traight Back On Lock Frame© As Shown By Arrow. Barrel ©, Fig. 3,
And Barrel Extension ©Will Come Out With Lock Frame©.
To Dismantle Lock Frame© From Barrel Extension©, Push Forward
On Accelerator ©With Thumb,And The Two Pieces WillCome Apart.
BM6-30NI7-DlSMAN-2(4l\
Base Shop Data-issue of 1-1-43 r
Small Arms GUN, MACHINE CAL. 30 BROWNING MI9I7A1		DISMANTLING	SHEET 3 0F4
REMOVE COVER ASSEMBLY
/76./
DISMANTLE CASING
5) Remove Cotter Pin ®, Fig. I, And Jake
Off Nut ®. Pull Out Cover Bol t ©.
Movable Plate©, Fixed Plate© And
Spring © Will Come Off When
© /5 Removed. Cover ©Will
Now Lift Off Casino ®.
(6j Pull Out Belt Molding Pawl Pin®, Fig. 2, And Pawl© And
Spring ® Will Become Free.
NOTE: Hold © In Place When Removing Pin © Jo Keep It From Fl ying Out.
Remove Screw® From Underside Of Casing ©AndBreechlock Cam®Will
Cdme Out From Underside
Of® As Shown By Arrow.
Fig. 2
\BM6S0i4l7~DI5MAN-S(4)
Base Shop Data-issue Of н-+з r
Small Arms 6UN. MACHINE CAL. 30 Ж,Ы6	DISMANTLING	SHEET 4 OF 4
DISMANTLE WATER JACKET
7j $emo ve Lock Scre @ From Muzzle
End, And Unscrew And Remove S team Pipe ®.
Unscrew Muzzle Gland©. Pull Cork©,
Unscrew Water Plug ©And Unscrew Eye
Bolt©. Also Remove Water Plug ©And Eye
Bolt®. Take Out Front Sight Screw ©And
Drive Front Sight ©OutOf Dovetail Slot/n
Sight Base.
\BM6-30NI7-DISMAN-4(4)
BS.D.-MG-8
ORDNANCE FIELD SERVICE
BASE SHOP DATA
GUN, MACHINE, CAL .30
BROWNING. M1917A1
PREPARED UNDER THE DIRECTION OF THE
CHIEF OF ORDNANCE
ROCK ISLAND ARSENAL - FEB.. 1943
B.S.D. No.
Overhaul
Base Shop Data-issue of /-t2-4iJ
Small Arms
SUN, MACHINE
CAL. 30
BROWNING
OVERHAUL
SHEET
/
OF 25
M19I7A)
GENERAL NOTES
OVERHAUL OF BM.G. CAL. 30 M1Q17A1
The Following' Overhaul Section Shows Procedure
Of Overhauling Each Part Of The Gun. It Deals
With The Special Overhaul Of Each Piece. In Addition
To This, All Pieces Should Be Carefully Inspected
For Cracks, Breaks, Irregularities And Excessive
Wear. Burrs Must Be Removed From All Surfaces.
All Sliding Surfaces Must Be Carefully Polished.
Paying Particular Attention To Sliding Parts,
Grooves, Flanges, Etc., That Must Work Smoothly.
All Parts Should Be Checked For Proper Func-
tioning With Mating Parts Before Being Reassembled.
Although All Parts Of This Gun Are Standard,
It Will Be Found Advisable. In Some Cases, To
Make Selective Fits. If Possible, The Parts Should
Be Reassembled On The Same Gun From Which
They Were Taken.
Before Parts Are Overhauled, They Are All
Thoroughly Washed In A Cleaner Solvent Solution.
BMG-30-MI9I7A /-OVERHAUL-1 (25)
Base Shop Data-issue ch
OF 25
Small Arms
GUN, MACHINE
CAL. 30
BR OWNING
MI9I1AI
OVERHAUL
SHEET
DISASSEMBLE COVER ASSEMBLY
Fig. I
Screw© And Push Windage
Screw Knob © Inward Until Key
(E) Enters Keyway ®. Pull Knob
Off Screw. Extract Spring ©
And Collar ©. Push © Out In
Direction Shown And At The
Same Time Push On Rear Of
Sight© In Same Direction. When
Threads Of © Disengage Sight,
It Can Be Removed By Turning
It To Free Keyway In Base And
Lifting It Off. Rebound Spring
© Can Also Be Lifted Off
Unscrew Pivot Screw ©And
Remove Lock Washer © And Pivot
©. Fig 2. Pull Bel t Feed Lever©
Free Of Slot In Cover ©And Re-
move. Unscrew Nut ©AndRemove
Pivot Bushing ©. Pull Ear Of
Cover Extractor Spring ©Out
Of Slot In Cam @ And Pull ©
From Spring Stud © And Re-
move. Remove Bel t Feed Slide
Assembl y ® From Cover As
Shown. Drive Out Bel t Feed Pa wl
Pin ©And Bel t Feed Pawl ©
Will Lift Out. Spring ©Will
Also Come Off. Check Spring in
Pin © For Tension And Wear.
ElGj.
BMG30M13I7A1-OVERHAUL 2(25\
Base Shop Data-issue Of *
Small ARMS GUN. MACHINE CAL. 30 DROWNING MI9I7AI	OVERHAUL	SHF CT 3 OF 25
OVERHAUL COVER
If Either The Cover ® Or Fixed Sight Base ® /5 Rem г
Or Must Be Replaced. Remove Four Rivets. Drive Out
Extractor Spring Stud © From Cover As Shown. Release
Cover Extractor Cam © By Taking Out Two Rivets. Rivet
New Stud® (Riveted Over On Top Side) And New Cam®.
All Rivet Heads must Be Filed Flush. Drive Out Movable
Sight Base Pivot® And Insert a New One. if Necessary.
Riveting it Over On Under Side. Stud © Can BePullldOut
At Any Time And A New One Driven In. After Necessary
Overhaul Has Been Done To® And ®, Rivet Them To-
gether With Tour Rivets And File heads Flush, polish
Surface Of Cam (7).
When It is Necessary To Build Up The Surface (See Insert),
Add Material Fo Surface® By Welding. Resurface Bottom
Face Of Fixed Sight Base® With A File. File The Sides And
End To Remove Scale And Excessive Wud. Mill The 7°Angles
To A Dimension Ovlrsizf .Сарет ш y File AndFit To Mating Part._____
BMG30MID17AI-0\'EPTIAUI-3g3\
Base Shop Data-issue Or i-n- 4
Small Arms
GUN. MACH I NT
CAL 30
BR OWNING
tAl9t7A1
SHEET
4
_____or 25
OVERHAUL SIGHTS
NOTE: Sights Are Never Disassembled Unless Necessary
(^)remove Joint Pin @ And Lift leaf ® From Base© Drive
Spring © OutOfSlot In Base. Remove two Scre ws ©And
Plate® Will Slide Off® As Shown. Now Remove Two
Screws ©And Screw®, /4l easing Cap®, St ide ©, From Leaf
And Slide®. Remove half Nut® And Spring ©From ®.
Drive Out Pin ®. And Screw Off knob (P) From hal г Nur®.
Drive Out Pin ©. Pull Out Screw Qp From Top And Slide
Head©From Slot In Leaf, Releasing Plunger® And
Spring®. Check Leaf For Bends. Straighten By Hammer-
ing. After Doing TheNecfs ary Overhaul Operations.
Reassemble Sight, Reversing The Dismantling Procedure.
\BIVG-SOMIS17A1'O^LPHAIJL-4CG)\
Вазе Shop Data-issue of
Small Arms
GUNJWACH/NE
CAL. 30
BROWNING
М13ПА/
OVERHAUL
jHt Г T
ASSEMBLE OMJLtSSFMBLY
(M
m
AfterAll Individual Parts
Have Been Overhaul ft-, Tut
Cover Can Be Reasul mlllu.
Place Spring® In Fl ace On Pelt
SudeQAs Shown. Placl [awl
®So That Spring ® Firs In
Hole Ok Underside. St curl HHh
Pawl Pin® Place Slide®In Grooves
OfCpvl к ©. Assemble Piva Би:, hin.,
® And Pivot Nut®. Place < ver l л -
Traci or Spring ®W/th Notched Enl-
fig, i Against ? 7 ue ®And Ear On Othe r E nd In
TK) St or Of Cam Q). Pl ace End Of Belt-Feed Lever®
Through : L"T)In®AnPQ. Put
Pivot ®7hrough®> ®And®.Insial l Lock Washer ©
And Screw®.
6jPlace Rebound Spring (PjFig.s,
over Stud And Pl ace Sight ®
Over Sight Base Pivot. Pl ace
Windage Screw® And Push
In Direction Shown By Arrow
Push Base © In Same Direction
at Same Time. Install Collar
®And Spring®. Place Knob
® Over Screw So Key ©
Fits Into Keyway®. Push Screw
® Through ®3o®/sClear
Of®. Turn © One -Half Turn,
Allowing Key ®lbEnter Keyway
Ж-30-Mim^EhAuL- 5(^
Base. Shop Data-issue: of 1-12-454
Of 25
Small Arms
gunCmachTne
CAL. 30
e>R OWNIN 6
MI9I7A1
OVERHAUL
sneer
TYPCI
/6 0/SC5
TYPCJL
12 DISCS
TYPE Ж
MJ Fig. /
OVERHAUL BACK PLATE GROUP
There Are Three Types Of Back Plates
In The Field, The Difference Bung In
The Contents Of The Tube. In- Ail Cases Screw ®Must First Be Removed And
Plunger ® And Spring © Taken Out Of Tube ©. Type I Now Consists Of
/6 Fiber Discs ®, Buffer Friction Cone ® And Buffer Friction Cup ©. TyplH
Consists Of 22 Fiber Discs ©. Type TH Contains One Fiber Disc ©, Stop®,
Spring ® And Filler (D. All Types Haye Buffer Plate ®. Ir Stocks ®
Need Replacing, Remove Screw ® And Escutcheons ®, Releasing Handles.
Pin © May Be Driven Out And Replaced Ir Necessary. Screw ® Should
Bl Tight. Check Grip ©, Fig. 2, In Plate ©. I г Grip Is Loose, Pin ® Is
Removed And Grip ® Unscrewed From Plate ©.
File Down Surface ® A Little Less Than The Pitch Of One Thread, Or
Until Grip ® Will Tighten Up In The Proper Position. Install New Pin ®.
Reassemble Back Plate In Reverse Procedure
Of The Dismantling. Be Sure To Tighten Up
Screw ® Except On The Last Method When (£
Is Used. Tighten ® Up Undl ® Projects
About 1/32 In. Beyond Edge Of Plate When
The Spring Is Compressed Solid.
вмс-замт1-отАт-(^
Base Shop Data -issue of /-/*-431
Small Arms GUN, MACHINE cal'. SO BROWNING MI3I7A1	OVERHAUL	5HE£J 7 Of 25
OVERHAUL BOLT
C4}
'z'/Raise Extractor ®To A Vertical Position To Disengage Slot In
Bolt And Pull Out As Shown. Pull Out Pin © And Remove Lever
©. Press Down On End Or Spring (E) And Push Into Slot © In
Side Or Bolt. Press Down On Sear © To Release It. Disengage
Spring © From Slot © And Pull © Out Or Bolt. Firing Pin ®
Will Now Slide Out lr Bolt Is Tipped With Breech End Down.
Remove Driving Spring ® And Driving Spring Rod ® Caution Should
Be Taken In Removing Rod ® Due To The .Strength Or Spring (B).
The Following Procedure Has Been Found * The Satest And Easiest.
Grasp The Bolt Firmly In Right Hand And Rest The Notched End Or Rod
® Against A Bench. Take A Firm Grip Around End Or ® With left
Thumb And Forefinger. Press Down On Bolt And Rotate 1/4- Turn To
The Lett Until Pins ® Are Disengaged From Slot in Bolt. Allow
Bolt To Raise Slowly Until Spring Can Be Grasped Firmly In left
Hand. Now Raise Bolt Ouicklx And Spring (&) And Rod ® Will Coml
Qut.
BMG-S0-MIS17A1:uYlRHAul-7(^
Base Shop Data-hsul of hi-m
Small Arms
GUN .MACHINE
CAL. 30
browning
M13!Mf
OVERHAUL
SHEET
OVERHAUL EXTRACTOR AND FIRING PIN
If Extractor © Requires Disassembly, Remove
Pin © And Plunger © Will Come Out. Also
Spring®. Spring© Can Be Removed From
Either Side. Remove Pin ©Releasing Ejector
®, Which Should Be Checked For Wear. After
Spring©, Ejector® And Plunger © Are
PutBack In Place, Pins ®And © Are Driven
In And Staked.
NOTE: Be Sure Pin © Lines Up With Slot In ©.
Should Be Removed Only When Found Nec-
essary. Drive Out Pin ©, Releasing Spring
®. Polish Pin ® Carefully. Tool © is
Used To Put Spring ® into Pin ®. Push In
Spring® Until Outer End Is In Beyondhole
® Turn Tool © Until Slot In End Lines
Up With Hole ©And Install Pin.©. Remove
Tool . All Other Parts Of The Bol tAs Shown
In Figure I. Sheet 7, Must Be Checked Closel y.
Due To THeImportant Function Of The
Bol t Group.
BMGSOMISI7AmRHAUL-8C2^
-/SSUE Of /-/2'4 J ‘l
OVERHAUL
gunjamhine
CAL. 30
&R0WMN6
М19Г7А1
ASSEMBLE BOLT GROUP
©if Pin 0/s Loose in Spring © irShould Bp Riveted Over On The End.
Sear © Also Should Be Given Special inspection. Nose ® Should
Have Sharp Corners. But All Other Corners Of © Should Be
Slightly Rounded.
(3)place Firing Pin ©In Bolt©. Insert Spring© From Top And
Push Into Slot © Inside Of Bol t. Slide Sear © In Bolt As Far
As It Will Go And Pull ©Out From Slot©, Thus Locking ©In Place.
/Install lever © And Secure With Pin©. Place Extractor©
/n A Vertical Position And Push It into Bolt As Far As it Will Go.
Now Turn ® Horizontally, Fitting It In Keyway Of Bolt. Insert
Rod® And Spring ® in Special Tool 0 Hold End Of Tool 0
Firmly Against Hole ® Of Bolt. Push Tool 0 Forward, Com-
pressing Spring ® In Hole ®. When Rod® Is Fitted Snugly,
Turn Jya Turn To The Right. This Locks Pod ® in Bolt.
BMG-3O:MI9/7AI-OVEPHAUL -T'Zji
B>ase Shop Data -izsueQf
SMALL ARM*'
GUN.MAChtNE
CAL 30
&R OWNING
MI9I7A1_____
OVERHAUL
SHEET
!0.IS
Tool Dwg No.
908090
OVERHAUL LOCK FRAME.
\&)PuSH Our Pin ® And Lift Accfl era tor ® From Frame ©. Drive Out Pin ©
With A Small Punch, Releasing Trigger © And Spring ©. Caution Should Be Used To
Keep Spring ©From Fl y/ng Out When Removing. Pry Pin © Of Plunger(£)From
Slot® In Frame©, Releasing Spring And Plunger. The Lock Frame Consists Of
Thref Main Parts.- Right Side®, Lett Side® And Separator ®, All Rneted
Together, Fig.2. They can Be Taken Apart By Removing Rivet ® And Spacer ®.
Reassemble With Nt w Rivet® And Spacer®. Guides ® And Stop ©May &f
Driven Out/f Necessary New Ones Are Inserted And Riveted Over. Guides®
Are Round When new And Must Be Milled To Proper Shape After Assembly
'• I(b; ^5T Spring In Pin ® And Spring
7©For Tension. Spring © Has л;
A Free Length Of 4.45'-.05. It
Should Stand A load Of not less Than (ty
12 Pounds Ат L8S>Ht юнг.
U/^Now Reassemble in Reverse
Procedure From That Used in
Assembly. Tool ® Is Used To Assemble
Spring ® And Plunger ® Into Hole.
iffigjg-AgW МЫШКУ J
Base Shop Data-issul of
OVERHAUL
SHEET
OF 25
Small Arms
OUNJIMCHINE
CAL. 30
bROWMNG
М19Г7А1
OVERHAUL BARREL FATEHSh)!-!
'Remove Spring® Ao Shown And Check For Crack
And Tension Drive Out Pin ©And Remove Lock
©. Inspect Threads © In End Of Extension ©.
If Stud® Is Broken, ItShoul: Be Removed And A
New Stud Riveted In. If Old Stud© Is Loose It
Should Be Tightened By Riveting Over The End.
Polish Carefully The Grooves On InsideOfExtension
© Also Polish Lock©. Make Sure The Beveled
Edges Are Smooth. Inspect Si'ring In Fin® For
Tension. Now Reassemble Exiension.By Inserting
Lock(QW/th Dgubi.l Bevel Edge upwardAndToThe
Front. Put In Pin ©With Secured End Of Spring
First. Slide Spring®In Slot On S/de Of®.
\bMCr30-MBl7AI OVERHAUL 11 &>)\
Base Shop Data-issue Of
Smail Arms
gun,MAch/nl
CAL 30
DROWNING
М19ПА1
OVERHAUL
SHCLT
IZ
Gt-2
OVERHAUL BARREL
p)Tool Dw& No. C5940
Barrel /5 Sighted Through To Check For Pits,
RustAnd Wear And For Straightness. If Gage ®
Inserted In Breech EndPassesIhe 6 ‘Mark, It Is Rejected
Anything Less Than 6" is Accepted. If 3O2'G age
© Enters The Barrel End Over One Inch The Barrel
Is Rejected, Fig.2. New Insert.ZOOB'Gage ©Through
Barrel. The.2 WF© Must Go All The Way Through
The Barrel Or The Barrel Is Rejected.
too. Dwg No.

3c=S
Fig.2
if Notches© Are Worn So They Will Not Hold The
Spring, The Barrel Can Not Be Used. Inspect Threads
©On Breech End Of Barrel.
\BMCSDMI9I7AI-OVERHAUL-12
Base Shop Data-issue of i-il-apa
Small Arms GUN, MACHINE CAL. 30 DPlOWNINQ М19ПА1	OVERHAUL	sheet /3 OF 25
OVERHAUL WAITER JACKET
® Tool Dwg. No. 43ZS58-3
Place Water Jacket ©In Special Vise ©And ClampIn Place. Plus Up
All Holes In Water Jacket ExceptTheOne At© Assemble A Barrel InThe
Jacket And Secure In Place So It Will Not Come Out Wren Air Pressure is
Applied Coat Joints® And ©And All OfTrunnion Block©W/th Soap Suds.
Connect Air Hose With Connection ©And Apply About 33 Lbs. Pressure.
Remove Any Part Adjacent To AL eak. If The leak Is Due To A Crack, Renew The
Part. If A Leaky Connection Appears, Sweat Part Back On.
REMOVE CASING
F/6.Z
^^//fTheTrunnion Is Cracked, Remove Casing. The Casing FtcA, Is Held On By
Three Rivets To Trunnion Block ®.
\BMG-30-MI3l7AF0VEPhAUL /3^
Base Shop Data /53^- Of ти-аъ*
Small Arms
GUN,MACHINE
CAL. 30
BROWNING
М19ПА1
OVERHAUL
SHEET
14
OF 25
REMOVING TRUNNION BLOCK
Tool D^&.No 4	&~9
Tool Dwg. No-
4Z/660
Fig 1
d) Tool Dwg. No. 433071
IQlamf Tightly Water Jacke T
® In Special Vise @ Place
Two блз Burners ©
Into Position Around
Connect ion Joint Of Trunnion
Block And Jacket® AndHeat Until The Solder InThe Joint Is Melted. Now Put
An Old Casing Around Trunnion Block In Normal Position And Insert Tool ®, Fig. 2,
On Casing. Proceed To Unscrew Block © From Jacke t ®.
NOTE'.An Old Casing Is Used Only if The Trunnion Block And Original Casing
have Been Taken apart.
BMG-3O'MI9T/A1-(MRHAUL-14 (2^)|
Base Shop Data issue of /-/z
Small Arms
ClJN. MACHINE.
CAL.30
0 VET HAUL
GHEE Г
/5
0?2Е
TooL Dwg. No.

CLEAN WATER JACKET
(d^\ After The Trunnion Elock Has Been Removed, Continue
Heat inc Jacket Until Lhe Colder Is Thoroughly Melted. Clean
Interior Thoroughly With Wire ^©Connected To 4 tbwER Вот or, / f Pos shell.
STRAIGHTEN WATER JACKET
Insert©,Fic.2, InJacket©Directly UnderTheDent. By Forcing©
кТУ AgainstThe Walls Of Jacket And Hammerinc On The Outside, Most Denis
CanBeRemove&Coa tThreads Of Jacket And Trunnion Block With Colder.
Continue Heating. Now Screw Trunnion Block Into Jacket And
Tighten Up To The Alignment Mark.
* NOTT-Both The Cleaning And Straightening Tools(A)And© Are Instr: ld
In Each End Of The Jacket.
I Ы^:-С’^Н7А16УЕВ!1А:;. ’ •..
Bass Shop Data issue Of
OVERHAUL
Small Arms
Ш.МАСН1НЕ
CAL.30
SHEET
0F25
RD MOVE CAP
/SS Take A Sharp Chisel And Cut An Alignment Line®
\®y Across Cap© And Jacket©. Now Put Jacket® In Wise So
Trie Cap End Is plated Br The Burners In Fig.I, Sheet 14. Remove
Cap With Tool®. Now Clean And Str a ighten Jacket As InOperation©.
Recoat Threads In Jacket® And Cap® With Solder And Screw
The Cap In. Tighten Up To Augnmen t Marks®.
DISMANTLE CAP
Melt Solder At Front Sight Base®
And Pose Connection®. Chip
Or Drill Out Screws® On Base®. .
A Serviceable Base©Is Then Soldered
On Jacket© And Two Screws© Are
Put In. File Def Heads. Solder On
Connection® And Screw In Two
Round Head Screws®.
\BM63jMmF0VL'RHAUL-l^
Base Shop Data-issue Of н/м+ъл
	CALKHAUL	SHEET /7
OVERHAUL WATER JACKET
Й) Check Holes® And® With Tap®. Muzzle Gland
Hole® Should Бе Checked With QageCc). If Necessary
The Threads May Be Retapped With Tap®.Hole© In
The Hose Connection Should.Be Rea med Just Enough
To Clean UpThe Walls.
BMG-30-MI317AIOVEPHAUUI7^
Base Shop Dai a-issue of hi-m
SMALL. AftMS QUNMACnlNE М1ЭГГА1	o VEKnA UL	SHEET /8 OF25
Dy) All Parts OfThe Casing Are Riveted Together And May Be
'-Replaced If Necessary. The Proper Placing Of Parts Is Been
In Fig.I. Bottom Pla те© Is Removed By Taking Out 8 Rivets On Bach
Side. Top Plate© Is Held In Place Br One Long Rivet Through Front
End And One Rivet On Each Side Of Back End. Trunnion Adapters©
Are Fastened With Two Rivets Each. No Rivet Is Used In Hole®
Until The Trunnion Block Is Put On. Cams© A nd© Are Secured
With Two Rivets Each.
Belt-Feed Pawl Bracket ©Is Held By Four Rive ts. Front
Cartridge Stop® Can Be Driven Out And Rear Stop© Is Held By
One Rivet. Stops® And©, Cams© And©, Adapters© And
Brack e t© Can Now Be Ri ve ted Back On The Proper Side
Plates® Or©.© Is Now Put In Place And The Long Rivet
Is Pu т Through The Fron t Hol es A nd Ri ve ted In Pla ce.
BMG-BOMHa^EMAUL-ei
Base: shop Data 'LSsue Of 1-11-4}%
CAL.X	OVERHAUL	SHEET !9 ar25
RIVLT TOP PLATE
AND
BOTTOM PLATE
Place Round Head
Ri vet© In Side Pla те®
From Underside. Place
Casing Over Tool® So
Rivet HeadRests In
Concave Detent In©.
Rivet Head Over Turn
Casing Over And Rivet
Other Side.
CAGE BOTTOM PLATE
' Tool Dho.No.
452070
E1&.Z
B^Gr30m7AI-0VERHAULI^
© In Position -
On Casing And Clamp
To Casing Plate.Put In
Cage© As Shown. Cage
Must Go In Before Bor том
Plate Can Be Riveted.
Ream Holes With Reamer©.
Base Shop Еага-н$<л of
SMALL ARM5~
GUN,MACHINE
CAL. 30
3R0WNING
MlPftAI
OVERHAUL
5НЕЕ.Г
Place Rivets ® In Holes With Special Tool (£). There
Are Eight Rivets On Each Side Of Bottom Plate^.
<§)Place Tool (£) Inside Casing Ф) As Shown In Fig. 2. Tighten
Nut © With Wrench (F) Un til Tool (£) Torces Out All Rivets
On Both Sides. Rivets Can Now Bf. Rneted With Tool 'TE^Sull In Place.
C,1-0Vr-:,Al  
Base Shop Data-issuer of i-n-w
Small Arms Gun, machine CAL 30 BROWNING M1917A1	OVERHAUL	SHEET 2! OF 25
^4) Place Casing (g) Around Trunnion
Block © As Shown In Figure 2.
Riveting Fixture ®, Figure I, Is
Inserted In Casing And Trunnion Block
And Pushed Tight Casing Can Now
Be Riveted On With Three Rivets.
Base Shop Data-/&sue of i-n
ШЬ OU. JO „ BROWNING JlliOAL		OVERHAUL	SHEET 2г OF 25
REAM AND ALIGN TRUNNION BLOCK

@ Place Special Reamer ® In Breech End Of Casing And
Push Forward Until Cutting Section Of ® Zs Well Into
Trunnion Block. Proceed lb Ream To 1.12+'+.002.
@Now Insert Gage © From Breech Of Casing. Gage ©
Must Move Freely In Casing, And Front End Of Gage Must
Enter Muzzle Gland Freely, if Gage Does Not Enter
Freely, The Binding Points Must Be Located And
Corrected.
3HG-3aMISI7AhOVERHAUL-2Z(2^
BASE SHOP DATA-issue Of
SHALL ARMS
GUN.MACHINE
CAL. 30
№!*
OVERHAUL
SHEET
23
______0F2S
CHECK CASING
Check Ears © Of Bottom Plate With Gage ®. The Shall End Checks
^zC/ Inside And The Forked End Checks The Outside Dimension. Ears © may Be
Spread By Inserting Tool ® And Tightening it Up.
If Necessary To Draw Ears Together, Use A Shall
"C'Clamr
A) TOOL DWG. NO.
908249
Q} TOOL DWG.NO.
9ов2te
@The Holes © Are Now Checked With Gage ©, Fig. 2. And Reamed With Alignment
Reamer ® if Necessary. Check Trunnion Holes © With Gage ®. And Ream
With Alignment Reamer © If Necessary. Check adapters © With Gage ©.
If The*Go'[nd Of Gage Will Not Sup Over © File The Side Faces Of © Until
Gage Fits. Gage ® Must Move Up And Down Freely Or Casing
Must Be Carefully Spread afart.
0 B-v
D
ВМ6НМ-Ш7АЮШШХ®
TOOL DN&NQ.
905396
TOOL DWG. NO.
903986
TOOL DWG- NO.
305449
TOOL DNtGNO.
908987
tooldng.no
908988
tooldng.no:
85833+
STS—ff
Base Shop Data-issuc or /-п-гз*
Shall Amis GUN. MACHINE CAL. SO	OVERHAUL	SHEET 24 OF 25
REPAIR COVER LATCH
PIG /
If Cover Latch Spring © Figure /, Has Lost its Tension
Or Is Broken, Remove Rivet Handle © Is Also Riveted
On From Underside And May Be Replaced If Necessary.
NOTE- Spring ® Must Come Off Before Handle © Can
Be Rehoved. Rivet Spring © In Place With New Rivet ®.
@Both Ends © And ®. Figure 2. Of Steam Tube Are
Soldered In Place And Can Be Removed By Heating And
Pulling Off. Sleeve © Now Slides Off Tube ©.
Replace Parts If Necessary, And Slip Sleeve © Over
©.©And ® and Sweat Into Position Shown In
Figure 2.
BFIG-3OMISI7AI-OVERHAUL-2K25)
Base Shop Data-issue of
Small arms GUN. MACHINE CAL. 30 ЮЯ*	OVERHAUL	StifFl 25„,
tools Required
TOOL DUG №	Sheet	OPER.	DET
	~5~	//	_L
968090	_5_	/4	7
^§4C> '	/2	19	Q
908982	ST	19	
	/2	19	E
4328583	13	Fig 1	
43307/	13	F/ed	~'E~
421660	(4	23	0
433073	14	23	X
421661	_J5_	25	D _
J32$3L	/£	_26_	A
908984	/7	28	A
B462/9	l7	28	C
908985	17	_28_	В
908245	19	30 j	В
TOOL UNS NO	SMET	OPER	DET.
432070	/Р	31	E
908243	20	32	C
421664	$0	33	E
433072	21	34	
433074	22	35	A
016176	22	36	В
908249		37	A
908248	23	37	8
B58334	23	-3S_	D
905396	23		F
9Q8987_	23	38	G
905469	23	38	H
908986	23	38	К
9089&B	23	38	X
			J
ВМЕ-ЗаМ1Э17АЖРНАиНЮ^
aS.D.-MG-S
ORDNANCE FIELD SERVICE
BASE SHOP DATA
GUN, MACHINE, CAL .30
BROWNING. M1917A1
PREPARED UNDER THE DIRECTION OF THE
CHIEF OF ORDNANCE
ROCK ISLAND ARSENAL * FEB.. 1943
B.S.D. No.
Assembly
3
Вазе Shop Data-lum о /-2f
Small Anms (5UN. MACHINE C4L. 30,	ASSEMBLY	SHEET OF 5
ASSEMBLE WATER JACKET
\J)screw Eyebolt® And Plug ©In Pla^e As Shown. Also
Assemble Eyebolt ©And Cook©. Muzzle Gland© Can
Now Be Screwed In Tight. Front Sight Leaf® Can Be
Driven Into Slot In Base And Held In Place With Screw©.
Now Screw Steam Tube © Into Jacket.
(If Cutaway In Head Of Tube Fails To Line Ur With The Hole
For Lockscrew Remove Tube And Face Off The Surface
Of Steam Tube Hole ® Until ©Screws Up Tightly In
Proper Position. Now put In Lock Screw ®)
Ж-30-И1317А1 -A53EMLY- / (S)
Вазе CShop Data-ьжОг /-2-*з Г
I Small Arms
16UN. MACHINE
CAL. 30
BROWNING
М1Я17А1
ASSEMBLY
sheet
2
OF J
Place Spring® In Hole
In Top Of Belt Holding
Дж Bracket. Put Pawl
®/n Place And Insert
Pin ©. Now Place
Breechblock Cam®
Inside Of Casing ®As
Shown In Fig. I. Pur In Lock Screw
®And Draw Up Tight. Now Back ®
Off Lock Screw © From ‘/h> To 'a
Turn And Stake In Place.
ASSEMBLE CASING
Fig. I

3)Place Cover © Fig. 2, In Place On Casing
®As Shown. Place Spring ®, Movable
Plate ®And Fixed Plate® On Screw&n
Positions Shown In Fig2. Now Insert®
Through Casing And Cower. Screw On Nut®
And Tighten.
NOTE: Do Not Tighten ®So Tight That
Spring ®ls Fully Compressed.
Insert Cotter Pin® And Check
To See That Cover Works
Freely.
B/AG-3Q-^7A/-AjJEmy-2(5]
О ООО
Dase Shop Data - i^U£ a /- -2- 0
~Small Arms-
SHEET
ASSEMBLY
6UN. MACHINE
CAL. 30
BROWNING
MiqiiAl
Fl& /
REPLACE MECHANISM IN CASING
©Screw Barrel ©Onto Barrel Extension ®. Be Sure Spring Is Engaging In Notches
Of Barrel. Draw Barrel Up Tight And Back Off About Three Notches.
Now Fasten Lock Frame
©To Extension® As
Follows: Place Forked
End Of ® Into Slots On
Side Of®Pull Accel-
erator © Up So The
Two Fingers Straddle
The End Of Bar ®. Now	_
Push Forward On ® While Holding ® Secure.
The TWo Will Lock Together.
Now Push Assembly ©Into Casing Until Pin@Locks/nHole©. Slide ©In Place.
(^)slide Bolt © Into Casing ©As Shown In Fig. 3. Pur Handle ® Through Hole In
Casing And Into Hole® In Bolt. Slide Handle Forward.
Fig 2.
Вазе Shop Data-issue Of 1-2-43^
Small Arms GUN, MACHINE cal. 3c> BROWNING MFH7A1	ASSEMBLY	SHUT 4^
'ASSEMBLE BACK PLATE
©Push Forward On Cover Latch ®And Slide Back Plate ® Into Grooves In
Breech End Of Casing. Pelease Cover Latch ®And Close Cover © Pill
Back On Handle® As Far As It Will Go And Hold In Place With Leet
Hand. Use A Screwdriver In Right Hand And Turn Rod© fa Turn To The
Left. Release Bolt Handle. Lower Sight Leaf © And Check Cun For
Proper Functioning Of Parts.
BHG\)0/1ISI7Al-A5SEmV - 4ЛЯ |
Base Shop Da та- &ue Of /-л -+з^
ASSEMBLY
Small Arms
&JN. MACHINE
CAL. 30
browning
MI9I7A1
HEADSPACE GUN
@Pull Bolt Back And Hold In Back Position. Put A Screwdriver In Notch © Of Barrel
And Tighten Barrel To The Last Full Notch. Non Back Barrel Off Two Notches And
Allow Bolt To Go Forward. If Extension © Closes Completely, The Barrel Is Re-
jected. If Extension Holds Open, Continue To Back Off Notches One Ar A Time
Until Extension Closes Completely. Now Back Off Two Extra Notches And
Gun Is Headspaced For Firing.
TIME GUN
©Pull Back On Bolt And Put Gage® Between Barrel Extension ©And Trunnion Block
©.Allow Bolt To Go Forward. If Gun Now Fails, The End Of Trigger ® Fig. I, Should Be Bent
Down Slightly And Tried Again. When Trigger Has Been Bent Enough To Fire On Gage ®,
Gage Is Removed And Gage®In3erted. Should It Fire With Gage® End Of Trigger Is Bent Up
Slightly. Adjust Trigger until Gun Fires On Gage®And Not At Gage® Check Trigger Pull.
(S^Trigger Pull Must Be Between 7 And IB Lbs. The Pull May Be Adjusted By
Bending The Sear Spring.
BNG-30-/V9l7A1-A3S£flbLY-S(S)
B.S.D.-MG-S
ORDNANCE FIELD SERVICE
BASE SHOP DATA
GUN, MACHINE, CAL .30
BROWNING. M1917A1
PREPARED UNDER THE DIRECTION OF THE
CHIEF OF ORDNANCE
ROCK ISLAND ARSENAL * FEB.. 1943
B.S.O. No.
Function Firing
Base Shop Data-issue Of /-4-43 $
$m,JC	rUNC ТШ FIRING	SHEET OF2.
Probably The. Easiest Method Of Hiring The Gun
Will Ье To Mount It On The Regular Tri pod Mount
/Is Shown Above.
BMG-3O-MI9I7AI-EFIR-1(^
Base ShopData-/ssue of i-+-4oA
Mtllk CAL.30	FUNCTION FIRING	sheet 2 OF 2.
And Between The Cap And Muzzle Gland.
The Rear Packing Is Placed In A Groove In Barrel.
Gun Should Be Fired For IS To 25 Rounds To Check
Proper Functioning.
UOIE; Function Fire This Gun In Accordance With
US Ar my Spec i fi ca t/ons S2~ G- 1.
BMG-30-Mmi-EFIR-2C^