tm 9-230 'machine gun mounts for boats' (1943)

7/27/2019 TM 9-230 'Machine Gun Mounts for Boats' (1943)

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1M 9-230

, _ 2, .R ~ . l P A R T M E N J JVl r . J , ""- ' "1 , , ~ 1/- TECliNlCAU MANUAL

MACHINE GUN MOUNTS--? FOR BOATS./14 OCTOBER 1943

" I'9 ' .1 from

U N I V , ~ S l T Y Of CALIfORN IA


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TlCHNKAl MANUAL }No. ' -230

TM 9230WAR DlJ'AItTMENT

MACHINE GUN MOUNTSFOR BOATS

CONTENTS ,........ ,...S!.CTION I . Introduction ....... . __ . . . _ .. . _- _ . 1- S

I I . Description and functioning .. '-8III. Operation and ad justments. 9-13IV. Care Bnd preservation 14-1 8V. Inlpe


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TM 9230, MACHINE GUN MOUNTS fO .oATS

f lgur. I - Co, 50, Modll_ GUll, ".a . o' Moullt M3'9,.,.,i,h Alrcroft Moch,_ GUll2 Or > If.

U N I V E ~ \ l T Y Of CAlifORN IA

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TM 9230MACHINE GUN MOUNTS fOR IOATS

, igu,. 2 _ Cal 50, AlCKhin. Gun, ,.fHI.,tal Maunt 11443,w'tlt Wal.,-cao,fHI Gun,

Or > If.UNlmllTY Of CAlifORNIA


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TM 92301- 2MACHINE GUN MOUNTS FOR IOATS

Section IINTRODUCTION

Scope .... " ." ." .. ... ....... . _._-_ ._ . __ . __ ._. __ . _ ._ .. ..... -Characteristics . .Differens among models ..... . . ......... .. _ ------- -- -----. -- -_... ...... .Data ._._ . ._. _ .. . . .... .... .. ..... .. .. .. " .......... _.Precautions ______ __ _____ __ ___ .

1. SCOP E.

, ....1,34S

. T bis manual is publilbed for tne information and g u i d a n ~ ofthe using arms charged witb the operation and maintenance of thismateriel. I t contains information r",,!uired by the using arms for theidentification. use and care, inspection, and maintenance of the following mounts :

( I ) Cal. .50 Machine Gun P edestal M ount M39.(2) CaI..50 Machine Gun P edestal M ount M43.(3) T win Cal. .50 Machine Gun Pedestal Mount M 46.(4) Cal. .30 M acbine Gun Rina Mount M4 1.(5) Btacket M ount M 40.h. For information on tbe use and Care of tbe machine guns usedwith tbese mounts, ..... tbe manUilis listed in section X .c. For the decontaminat ion of the materiel affected by chemicals

aod for treatment of cuual t i" ...... T M 3220. FM 2 1-40. andTM 32 15.

2. CIIARACTEHISTICS .a. M""hinc Gun PedCl! tal Mounte M39 , M43, and M46 (fias. 1.2, aod 3) . These mounlS are similar in construction a od are desilnedfor dose range, hiib--anale, antiaircraft fire. T hey can allO be lockedin position for use Hiainst around tarielS. They can be trllversed ma nually throuah 360 d"ltrees and e levated from minus iO d"ltreel to plus80 d"ltrees, and locked in botb elevlltion and t raverse by a linilelever. T he Mount M39 is provided with a Browninll M achine Gun,cal. .50, M 2, Aircraft. T be Mount M43 is provided witb a BtowninllMachine Gun. cal . 50, M 2, Water"cc.ed by cbon,. , or , i{ " " ,n""" . by on .,,1)" . . i,ion. 0.., I I " " "U N I V , ~ \ l T Y Of (AllfORNIA


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INTlODUCnON

lA 'D 117)0

TM ' .230,

' l tu , . 3 - TwIll Col. .50 , MaddM GUll , ,H.",:" Mount " ' ' ' ',Wit" W"'.r-coofecl GUll'b. M..:hine Gun Rln! Mount M41 (f i" 4) . Thi. mount Ui de

si,ned fO!" cw.e ranle, an tiairel'lft fire and can . 110 be UIed .,.illlt&round u-f(eta. The mount can be tTII.venoed manually 360 deKrHSand elevated from ~ e r o dej:ree to about pLu. 50 dearees. In addition,th

." Bracket MOllnt M40 (fi&- 5 ). Thi. mount hal crldle withcradle pintle, identical with tru:- of the RinK Mount M41 . Th; '

5 Or, If.U N I V E ~ \ l T Y Of CAlifORNIA


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TM 9230,MACHINE GUN MOUNTS POW .oATS

l U ~ I Y E R \ I I Y Of (ALIFOI'NIA


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fit .... s - . ~ h t Ma ..nt M40

TM 92302--'

mount ill to be u.ed with. Browninl M.chine 0 ..... e. l .30 Ml919A4(llexible). .3. DIFFERENCES AMONG MODELS.

The cr.dles of the Mounts M39 snet M43 have no recoil .!orb-inl device snet the lun meleet plsles sre fixed 10 the side piltes.Thete mounu are intended to be msneuvered without power or powers . l t Ince. The _ i l h t of the shield, run. s mmunition chan, sndsmmunit>on . t .11 .n l les beinl equilibrsted by mesnl of s helical

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E ~ \ l T Of CA lifORNIA


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TM 92303- 5MACHINE GUN MOUNTS FOR BOATS

apring loclted within the pede$tal tube to the e:o:clu,ion of counterweights. T he cal. .50 Browninl air..:ooled (aiTCtaft) or water..:ooledmachine gun may be U$ed either on the single M ount M 39 or theM ~ 3 by inten:hanging the sprinl suitable for the particular gUlLThe cradle of the Mount M ~ 6 is provided with a double acting,recoil absorbing device 80 that the inner Kun bracket plate$ areallowed to recoil with the KUns within the side plates.

b. The sliMs provided for the M nunts M39 and M ~ 3 are aaembledto the gun while the sights for the M nunt M46 art: assembled tothe mount.4 . DATA.Mount M 39 or M ~ 3 (without Fln or ammunition chest) ,. , . , 7251bMount M ~ 6 (without guns or ammunition che.t .)M ount M41 (without gun or ammunition chest) _.Browning Machine G un, cal .50, M2 , Aircraft .. , . , . ... ,. . . . . -'B rowning Machine Gun, ca l .50, M l , Water..:ooled."Browning M achine Gun, cal .30. M1 919A4 (flexible) .. . ..5. PRECAUTIONS.

825lb60lb651b

100 lb3 1 lb

s. T he shipping lock on the Mounts M 39, M43, and M46 is requiredonly during transportation of the mount from the manufacturer, andmust be completely removed afte r the gun has been mounted butbefore the mount is to be put into use,

b. T he cnunterbalance sprinK within the pedestal tube of theM ounts M39, M43, and M46 is under compression when the mountis shipped, and it must not be released until the gun has been securedto the mount.

c. When the coun terbalance spring is not in place, do not releasetbe locking lever, as the cradle and guns will fall.

d . The rt:versible name pl"te on tbe sight assembly containerat the lower right.hand corner of the blck of shield should at alltime$ indic"le the kind of counterbalance spring in place in thepedestal tube. When the spring is changed, the plate should be chanKedaccordingly.

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S.ction IIDESCRIPTION AND fUNCTIONING

Machine lun pedestal mount. M39, M43, and M46Machine lun rinl mount M41 and bracket mount M40Machine lUllS

TM 9-230' .......6

18

6. MACHINE GUN PEDESTAL MOUNTS M39, M43, AND M46.a. Com ponen" of Moun ll. The chief components of each mount

are the ped . stal, soc'cet, cradle, shield, shoulder braces, back strap, andlight assembli .. . The cradle with gun is rotatable in the socket of thepedestal.b. Crad le A&8f:mb ly (figs. 6, 7, 8, and 9). Each cradle consists oftwo inner lun bracket plates and two outer side plates held togetherby spacer.. The cradles of the M ounts M39 and M43 have no reo:oilmeo:hanism and the lun bracket plates are fixed to the side plates.The cradles of the Mount M46 are equipped with reo:oil and counterreo:oil Spr inlS. Thus the gun bracket plates to which the luns are.eo:ured are fr ... to reo:oil within the side plates. The reo:oil springstend to ab.orb the .hock of reo:oil while the counterreo:oi! $prinp areheld to return the guns and inner plates into battery. A cartridge casechu te is se.:ured to the inner platesof the cradle, and deAeo:ts the ejectedcases to an opening in the shield A canridge case defleo:tor, whiche ~ t e n d s downward from the forward eod of the cud!e, causes theejeo:ted cases to drop to the deo:k. An ammunition box support bracketis mounted on the left outer side plate of the Mounts M39 and M43and on each outer side plate of the Mount M46. Each bracket supports ao Ammunition Che.t M2 havinl a capacity of 200, cal. ,50,rounds.

e. Shi el d A&8f:mbly (lill. 6, 1, and 8) , The shield i. secured to thecradle through an angle-pieo:e welded to the outer side plates. Theshield is made of 'Ilinch armor plate and is resistant to cal. .30 andcal .303 armor-piercing bullets, normal impact at test range. On theupper rear face of the shield are two .boulder brace extension tubesto which are clamped the Iwo frames with rubber paddinl. The lunnerk ...p. hi. shoulde . against the brace fram es to maneuver the mountdurinl lirinl

d . Pedestal A&8f:mbly (fill. 10 and 11).( I ) The pedestal assembly consists of the pedestal body, ballbearinc, housing, and counterbalance sprinl with connectinl rod. The

pedestal body as.embly i tube with ribs and a base. Drain holes aredrilled at the bue of the tube and also in the center of the base. Apushtype, preuure_lubricatinl gun, having a 3-ounce capacity, is,

0.., I I " " "U N I V , ~ \ l T Y Of (AllfORNIA


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1M 9230MACHINE GUN MOUNTS POI .oATS

$10( IVIHS

I!O!CHII ,U . 1'0 11111

",lIt. ,_ _IIf . Mn . ttJ M4l _ _/gilt Ski. VIaw"


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TM 92306DESCI.PTlON AND fUNCTIONING

AMMUNITION 80XSUPPORT BRACKPiT\

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U . '11 7J71t

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TM ' 230MACHINf C)UN MOUNTS POll IOATS

"U ' . - . l lON lOX~ , MACKEl"

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flgu . . , _ C,adl., f Mount M046 - Top VI_

1M 92306

mounted on IprinK clip of the peden.t The pedest.l tube boI.asH aheavy compression c o u n t e r b a l a ~ aprinK- The function of the ~ n lill twofold, to C1.Iahion the faU 01 the Kun .nd cradle when ch.anlinlfrom an elev.ted to a horizontal ~ o n , a nd abo to reduce the forcerequired of the lunllfl" to elev.te the lun foc hilh .nlle firinK- Thecompr.,..ion of the ~ n l u n be varied to luit the individual ~by adju.ltinl the counterbalance Iprinl oonnectinl rod. The lower endof the oonnectinl rod ill leC ured to the count ...bal.nce aprina luideand ca p at the top of the aprinK. The upper end of the oonnectinl rodis thre.ded into a cn::.shead in the cradle, and lui. an adjustinl nutwhich i. used to " ,pla te compreuion of c o u n t e r b a . ~ IprinK-

(2) The type of counterbalance ~ r i n l used dependt on the typeof mount and KWI. The tprinK ' .re painted different colon lo r elllYidentification (par. 20 b (4 .

(3) The ball be.rinl' .re IIttOmmodated in the ball bearinl hoIRinl between inner and outer bearinK rinp.e. Soekel Aaaembly ( l ip. 12 and 13 ). The lOCket i, a Ipieceustinl. The luIw of the lOCket lonm the upper hall of the bearinK

hoUlina which i. leCured by 8Cl'ews to the lower hal f of the bearinKon the pedestal. I t 8Cl'ew, which i, adjustable by mean. of a nut , i.housed in the riKht . ide of the .acket. The screw contaCII the cradle.ide plate lIop and thus prevents the mount from beinl depreuedbelow the ufe anKle determined by the requirementa 01 the inatalla

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TM 9230

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MACHIN! GUN MOUNTS ro. .oATS

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TM 9230DESCRII'TION AND fUNCTIONING

c , > INNER BARINC. R ING~ " ' ~OUTER. BEARING BEAR ING HOUS ING- . WASH[R

PEDfSTAL " ' ' '--

'IgII'. " - ".d . ,,, alld

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tall _ _ hl9' Group ofOM Nl4615 Or > If.

l\JjlIIlCATINC GUN, / l ~ C l - l l ' SPIUNG

NIount. M3P, A1143 ,



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tM 9230MACHINE GUN MOUNTS fOa lOAfS

I!< ~ I~ ~ i~ ~ ~~ ~~~ ~" 0 ~ w~i ~16

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DESCII'TlON AND .UNCTIONING

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U N I V E ~ \ l T Y Of CAlifORNIA

TM 92306

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TM 92306MACHINE GUN MOUNTS fO. IOATS

tion of the mount. The rear of the socket of the Mount M46 housestwo spring-operated bumpen, one on left side, and ooe on right ' ide.The function of these bumper. is to cushion the shock of the gun. andcradles when elevated to a maximum of plus 80 degrees. The socketcan be locked bo th in trave..e to the pedestal and in elevation to theside plate of the cradle by the block nut clamping handle. The clampin, handle i. held in the uolocked position by the clamping block nuthandle lockin, sprin,. By pulling the block nut cLamping handle rearward and upward through an arc of 150 de,rees, the cradle i. lockedboth in elevation and trave..e. The block nut clampin , handle canbe adjusted for tightness.

r . Back S trap Assemhll' (ligs. 6, 1, and 8) . The back strap, whicnserves as a s e ~ t for the gunner, i. secured by chains to the side platespacer bolt nuts on the outn .ide plates. The length of the back strapmay be adjusted to suit the individual gunner. This is done by threading the shaak of the hook through one of the oblong lin'" of thechain aod thence to the side plate .pacer bolt nut on the side plate.One or both of tbe back . trap chaios may be adjusted in this manner.

g. Sight A....,mbli.,. (figl. 1,2 ,3 , 14, and IS ).( I ) T he sights of the M ounts M39 aod M43 are assembled to

the machine gun while the sights of the Mount M46 are assembledto the mOUllt, The rear sight of the M ouots M39 and M43 is se

" 0.., I I " " "UNlmIlTY.Of (AllfORNIA

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DISCI'PYION AND FUNCTlONINO

TM 9230- , . ~ " SIGHT ASSEMBlY

- ' ' ~ SIGHT BRACKET

C H T

... ' D 111)9fjgll, 'ronl $lgII, 01 Nioultt Ma

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TM 92307MACHINE GUN MOUNTS FOR IOATS

7. MACHINE GU N RI NG MO UNT M41 AND BRAC KET MOV!l.TM40 (6p.. S. IS, and Hi) .a. Machine Gun Ring Mount M4 1.

( I ) CoMPONENTS 01' TN !!: MOIJNT. T he chief components of themount are the cradle, quadrants., main tube with latch, back restbracket, and 6.ed and revolving ring assembHes.( 2) CRADLE ASSEMBLY. The cradle is mounted in a small tubeon the main tube, The cradle consists of two side plates welded totwo space"" one at the front, and one at the rear. An ammunitionbo" support is welded to the left side plate. The cradle pintle i .secured to the side plate by two trunnion bolts with nuts. The cradlepivots on the two bolts. The nuts art! tightened sufficiently to stabilizethe cradle and then .biked in three places. Two chain lock pins onthe right lide plate serve to lock the machine gun to the cradle. Thepintle lock assembly is se


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OESCIIPTION AND FUNCTIONINGTM 92307

_ """ ' " SICliT ...ssMBLV

"flII'. 1.5 - ''0'" Slg'" 01 Mou", M"21

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1M 92307

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MACHINf GUN MOUNTS POI IOATS

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DESCIIPnoN AND FUNCTlONINO

T'ON BOX

;"" 'NTUBE

PINTLE LOCK ' ' - 'I N


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Secl lon IIIOPERATION AND ADJUSTMENTS

Mounting the machine guns , .Mounting the sightsOperations .. . _____ __ __ " ____ __ ___ ___ _______ .. .. _______ .. __________ ___ _'__Adjustmen tsDismounting and replacing the machine guns ......................... .

9. MOUI 'T ING THE MACHINE GUNS.a. Twin Ca l.. 0 Machin e Gun P ~ e l l a Mounl M4-6.

91011""

( I ) Place the machine gun on the mount 50 that the balTel pro-trudes through the gun hole in the shield and the mounting holesof the gun aline with those of the gun bracket plates.

(2 ) Se


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OI'ERATMJN AHD ADJUSTMENTS

TM 9230"

lo \ rD 71716f ig"" I ' _ S ..u,;ng ' tonI f Moch'. . . OU" 10 Moun' A1146

lA PO rn:ufi8" '. 19 - * " ' ; " 8 llear of Moe"I". GUll ,,, ,1,401111' Al46

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1M 923010MACHINE GUN MOUNTS FOR IOATS

II"u, . 20 _ s.cu,ln" AI_hi . . . Gun '0 MoUIII Moll(2) FlIoNT SIGHT (Ii&- 15).(a) Slip the front silM adapter with bracket uaembled over thebarnol of the iW ' until it i. on the trunnion adapter. The front ,iaht

lockinl handle should be toward the muzzle. Secure the aiabt adapterto the trunnion adapter by puahlnl throuah the ICfi!W and tiahteninlwith the nut.

(b) Anp mble the front silht a_mbly to the front . i lht bracketand tiahten the lockil\lil handle.

b. Cal50, Machine Gun. Pedestal Mount M43.( 1) R ....... SIGHT. T o a_mble the rear siabt, proc:eci a. in 1UbpaTalTaph a ( 1) and P) above.(2) FltoNT SIO HT (filii- 14 ).(aJ T o a _mb le the front , iaht, .lip the front siaM clamp withbraeket I I" ",bled over the water jacket. The front ,iabt lockil\lilhandlet .hou ld be toward the muule. Adjuat the front a lht clamp .,that the two boles on the inaide of the clamp arm. lFIlIlale the two.tudt on the jacket pupmbly. T ilhten the ao;rew. on the end of eachdamp arm and lock with wiu . The wire tbould pal throl.lJh theholes in clamp annL

(b) Auemble the fron t fi&ht a.umbly to the front " lht bracketand tiaMen the lockil\lil handle.c. Twin Cal.. O, Maehine Gun, Pedell " Mount M46.( I ) The rU r ailht comes a . ,mbled to the mount; only the front' ;Iht hat to be a _mb .eeL

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O'ERATION AND AOJUnMiNTS TM 923010-11

U . 'D '2721' lfu. . 21 _ Sftlpplltfl Loelllt f/tgOg.m.It' Willi Sid. ,.101. Spco(.' loltof Mount M46

(2) A.emble the ftont li&ht auembly to the l ip t abaft, andti&hten the lockin& handle.11. OPERATIONS.

. Re mo n l of Shlpp ln ll Lock.( I ) TH Is OPEIlATIOM M UST BE DoME O MLY Am . no : GUMS

HAVE BEEN Moul .1 fwm



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TM 9230" ,MACHINE GUN MOUNTS fOlt BOATS

lA P'D 12mFJgur. 22 - DI..0909 ;/19 Shippi"' J lock 'rom Sid. PIal. Spoee, aoIt

of A4 o lln' At46h. EI. ,u tlon and TunrM: of Mounu M39, M43, and M46.(1) Rotate the block nut clampilli handle down and forw ...d,

to free the mount for elevation and t rne .... (Ii,. 23).(2) Maneuver the lun in elevation and trav". . by pltSlina: the

.houlden a,lIinat the shoulder brace framel and with the !lamb onthe .pade &rips.

(3) To lock the &Un at . . ,y point in e]en t ion, rotate block nutclampin, handle to the rear and upward in an arc 01 about 150 de-,,-

c:. E1",.. llon and Trav,,",", of Mount M41 .(1) To elevate or deprea the main tube with cradle and IUn,IqYeeII! the cable openting lever and mov" the main tube throu&h

the dHired angl". M ake certain the latc:h tube hub pin. enl_le theteeth on t he quadrllnU before ",Ieuill( preaure on the cable oper-atinl lever.

(2) T o treveree the main tube with cradle and pn , Iqueere thecable openoting lever to un]oclt the revo]vinl r inl and rotate themount throup any delired anl]e. Malte certain the latch tubehub pin. enlale the teeth on the quadrant. before re]eaMI pre . ....eOf! ]eYff . " Or > If.



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O'UATION AND ADJUSTMENTS

TM 923011_11

Figure 23 _ _. I" ' ;ng IIlock Nul Clamp/IIg HaMIl. 0' MouII' M4 If.

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OPERATION AND ADJUSTMENTS... Adj u olment of C o u n t e r l ) / a n ~ e Spring Ten.ion.

TM 923012 - 13

( I ) The cradle and shield can be equilibrated readily by adjusting the tension of the counterbalance spring.

(1) Rel . ~ the connect;ng rod adjusting nut on the connectingmd.(3) Tum the rod, by hand or with a wrench on flats. to the right

to make the muzzle h .avy, or to the left to make breech heavy(fig. 24).(4) When the desired balance is reached, turn the connecting

rod so that the lubrication fittinl on the rod faces forward and available for lubricating gun. Then tighten the connectinl rod adjustinlnut.

CAUTION: On the Mounts M39 and M43 the connecting rodmust not protrude more than V2 inch beyond the top of the counterbalance connect ing rod crosshead.

,I. Adj".lmtnl of Blark Nul Clamping Handle.( I ) MOUNTS M39 OR M43 (fig. 8). Remove the brake handlelocking spring from the side pla!e clamping block nut on the cradle

clamp shaft. Tighten the handle partially, remove it, and replace ilin original position on block nut. Replace the locking spring. Repeatoperation i f nectsSOry in order to get Ihe right adjustment.

(2) MOUNT M46 (fig. 9). Back off the two nuts on the Jeft sideof the cradle clamp shaft. Pull up the block nut clamping handle andtighten the nuts nn the shaft. Test functinning of the clampinl handlewith gun in elevation and readjust if nectssary .13 . DISMOUNTING AND REPLACING THE MACHINE GUNS.

a. Set th" mount at maximum "Ievation and lock ;t securelywith the block nut clamping handle. R e l e a ~ the C


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1M 923014- 1.5MACHINE GUN MOUNTS FOR lOATS

5e


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CARE AND PRESERVATION

TM 92301$-1 '

care to remove all traces of the compound from all recessel in whichsprings or plunge" operate. After removing Jon traces of the compound, allow the parts to dry, and then wipe with a clean dry rag.16, CARE BEFORE , DURING, AND Afo' TER COMBATOPERATIONS.

a. Core and cleaning before combat operations include Care ofthe mounts necessary to preserve their condition and appearanceduring periods when no firing is being done. Mount. should be inspected daily for proper condition and cleanline . . Remove all dirtand rust from the mounts, and wipe with a cloth oiled with OIL,lubricating, preservative, ligb!, above !ero degree F, or OIL, lubricat.ing, preservative, special, below !ero degree F . Clean all unpain tedmetal parts thoroulthly, and wipe with an oiled doth. In Cllse of rain,snow, or dust storm, keep the machine gum covered with the Ituncover.

h. During lull. in combat operations. clean the mount as de-!l


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TM 9230" MACHINE GUN MOUNTS POI toATS

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CARE AND PRESERVATION

TM 923011

tions warrant a chanke of lubricants. Ease of o ~ r a t i o o is the prin_cipal factor in determinink when to chanke lubricants aftu a tem_~ r a t u r e drop.

c. I f the mount does not o ~ r a t e properly due to IOlidincation ofthe grease, remove the counlubroLance sprink and baLL bearinp, anddegrease them with SOLVENT, dry-cLeaning. and wipe with a deandry doth. Then plKk the rpriolt aod ball bearings with GREASE,O D ~ No. 00. For procedure 10 replace Ihe sprinlt and bearinp, _paraltraph 22 e aod f

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TM 923019- 20MACHINE GUN MOUNTS FOil 80 ATS

s.ction VINSPECTION

P urpOiIIe .. ,_ .. _........... .Procedure ........ " .......... .. ... _ ..19. PURPOSE.

, ......."0a. I nspection of your materiel is vital. T horough systematic m

spection at regular intervals is the best insurance against an unexpected breakdown at the critical moment when maximum perform-ance i. absolutely ne.:essary. Never let your materiel run down; keepit in first class fightin(l. condition by vi(l.ilant inspection and promptmaintenance.

h. I nspection is for the purpose of determining the CQndition ofthe materiel, whether repain OT adjustments are required, and theremedies ne.:essary to insure servic . .biJity and proper functioning.It, immediate aim is trouble prev .ntion which includ .s preventivemaintenance, inspection for any evidence of improper treatment ofthe materiel due to handHn(l. before delivery into your hands, andinspection for OTdinary wear or defects of parts that may require replacement.20. PROCED URE.

I I. Gen era l. The instructions for inspection are given al a unitfor al l the mountll listed in paragraph 1. Instructions which do notapply to the particular mount in question should, therefore, be dis.egarded.

h. Mo unt al a Unit.( I ) Che.:k whether the mount is firmly secured to the de.:k; anylooseness will cause vibrations and affect the accuracy of firin&-(2) Ezamine the mount for completen ... and for the followinglOOlO! parts:

(a) F or the Mount M 46 : the canvas cover and also two frontsight a$Sl!mblie .( b) For the Mounts M39 and M 43 : the canvas cover and alllO

the front and rear sights with their supports.(3) Che.:k whe ther the name piatel are properly secured and

correct ly labeled. Single mount with aircraft gun should be markedM ount M l9 and with water...:ooled gun M ount M43_ Che.:k if thereversible name plate on light container il correctly positioned. Whenaircra ft gun is used, the plate should read ~ a i r - c o o l e d gun spring inplace". W hen wllter-cooled gun is used, the pl ll!e should r ...d "water-cooled gun spring in place".

36 0.. , I I " " "U N I V , ~ \ l T Y Of (AllfORNIA


38/62

INSPECTION

TM 923020

( 4 ) Look into Ihe reo:ess III the bottom of the pedestal tube tocheck whether the right type of spring in place. For the MountM 39 (aircraft gun), the spring is painted green; for the M ount M43(water-cooled gun) , the spring is painted block; and for the M ountM46 ( water-cooled lun), the "prinl is painted yellow.

(5) Check the mount as a unit for condition, rigidity, or loose.nle$!! of component assemblies. Check for weldinl defects. Note iflubricatinl gun is attached to pedestal Check condition of greasefittings.

(6) Elevate and depress the mount through the full range andnote any bindin&" or sluU:i.h movemenl

(7 ) Rotate the mount through ill full range and note any binding or sluggish movement.(8) Rotate and e levate the machine gun and crad le on theM ount. M40 and M41 and note any bindinjt or .lu&"gish movement.(9) T est the functioning of the block nut ciampini handle.( 10 ) T est functioning of cable operatinl lever ( Mount M41 ).T est functionin g of cradle pintle lock of M ounu M40 and M41.c. Shi eld Auemhly.( I ) Examine the shield for sharp comers and defective welds..(2) Note if the shoulder braces are firmly damped to the shoul.

der brace exten.ion tubes. Check if paddinl is ]00..,.d . Cradle A....,mhl y. Check the cradle for loose parts such ascartridge Ca.., deflector, ammunition box support brackets, and CaT-tridge case chute. Check whether gun pin locking screws are loose.Note whether recoil and counterrecoil springs are secured in po.i.t ion by the counterbalance sprinl itlJide caps. Check fit of ammunition bolt; it must be easily replaceable. Check whether cradle sideplate $lOP is 100..,.

e. Pedellal and S o c k ~ Aue mhlle( I ) Check functioning of cradle side plate stop and the screwwhich regulate. limit Df depres. ion of cradle.(2) Check fu nctioning of the bumpers.(3) Check for looseness of screws on lower end of socket .(4) Test functioning of connect iol rod and connecting rod ad

justing nut.f . Sight Auemh lietl.( I ) Cbeck front sights for loose parts.( 2 ) Check rear sights for loose and broken parts. Move one andtheo the o ther lens retainer into position a nd note functioning oflen. retainer springs..

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39/62

TM 923021 -22MACHINE GUN MOUNTS H)I IOATS

Section VIMAINTENANCE AND REPAIR

General ....... ... . .... ... ... ... ... ......... ............. .Preventive maintenance .Replacement of WQrn or broken partt ..... .. .. ... .. ................... .... ".21. GENERAL

......."""a. The instructions for maintenance and repeir are given as a unitfor al l mounts listed in peragraph 1. Instn.>etions which do not apply

to the particular mount in question should therefore, be disregarded.The immediate aim of the:oe instructions is trouble preventinn, whichincludes preventive maintenance and replacement of worn or broken-.22, PRF.VEl\iIVE MAINTENANCE.

a. G", n ",ral , Tight"'n all bolts, nuts, and ocr",w. to prevent theirbecomin& 100"" in ""rvice. Thi. should be don'" periodically when th'"mount i . in use. R emove all dirt and rUlt from the mount. Clean al llubrication fittings and pII$SRges, m akiol certain that .. II dirt andmetal chips have been d", .ned out. Clean all contactinl .urfaces.10, Adju'tm",nt o f Cud le, of Mount M46 in Horizontal Pla n ",_

( 1) Set the mount in horizontal.(2) Set up a smooth target- lurface at a di.tance of 25 feet, with

the center about 5 feet in height.(3) M ount the guns 00 the mount. Remove the spede grips withbIIck plate aod the driving spring. Pull back on the handle far enough

to remove the bolt handle or pin and then withdraw the bolt assembly.T his leaves the receiver open 80 that a light may be taken throU&hthe gun bore.(4) Set one lun at rilht angles to the target. Sight through thebarrel of one of th", machine luns and place a cross mark on thetarget to indicate alinement of center of bore.

(5) Lock the mount in elevation by using a Cdamp or othe.mean .

(6) Rotate the lun. about 180 degr"'"" in traverse and ";Iht atSSme mark throulh the muzzle "nd of the barr,,1.(1) Make the adjustment. until the mark i lhted from " .ch

end of barTel.(8) Bring the other gun into same horizontal position by looten_

ing the nut bel ...w .ide plate crosshead and tilhtening the nut ..bovecrosshead.

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MAINTINANCE ANO ItE' ...1tTM 9230

22

lA ' 0 71141'/gOlF" V _ _ cIT J/gII , COIIIMCI'Io.u

"UN IVERIT', ~ ' " ~ A l I f O R N ~


41/62

TM 923022MACHINI OUN MOUNTS rolt .oATS

U I'D 12746f ;lIu" 2 ' _ It., S;,1'" in ' o ' ; ';on fo, A.tlju"ma .

(9) Sill,ht throur.h lI,un barrel ,uccHlively from each end, ..mr;..me mark on tartet .urlace UIed in lill,htinll, l im .......CAUTION: 00 not relea., cradle in elevation while .ir;htint; theIeCOnd IUn.

(10) When all four poIition. of tartet .ill,htina: coincide, lir;hlenthe nub below side plale c r o a ~ l I I d i to hold cradl.,.. in poIiliolL

(11) Replace r;un part. unle. . sir;hb are 10 be adjuated as de-Kribed in followinr; pararuaphL

e. AdjlQlmenl of Sigh . . on Mount M46.( I ) Brinr; crad le. inlO . .me horizontal plane as dHc:ribed in.ubparal"'Ph b above.(2) Set the mount leve l.(3) Erect IIIn uprir;ht tara;et 'UTflllce , centered 5 to 6 feet in heip!,at e:uctly 25 feet throur;h the mount from rear .ill,ht rina: wire, and at

.. Or > If.U N I V E ~ \ l T Y Of CAlifORNIA


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MAINTINANCI AND II'AII

f lgu, . 29 - llea r SlgM In Poaltion 'or fi ring

1M 9230"

ri&ht anile. to a line from the center of the mount to the middle ofthe tartet.

(4) Set elention 80 tMot the aun bore. Ilre approllimately at ri&htanllel to a line from the center of the mount to the middle 01 thetartet and then lock the mount. Si&ht throlllh aun balTe" and m ukthe centeR of both IUn borH on tartet aurlace. Connect both centeRwith h o r i ~ o n t a l line: then erect a perpendicular at the midpoint ofthi. line.. Locate an intenection muk on the perpendic;ular line15 2 ~ 2 inchel above the horizontal line.

(S) I_ u n the upper two cap ICN!WI on the ru r 'i&ht baM(Iii;. 27) but keep aufficienttelllion on IereWI to hold the surlaeel 01the rear li&ht baH lUide t",ether. Then m.ert and ti&hten the oerewin bole 01 reu a&ht bouainl muked '"TESTING- (Ii;. 28).

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TM 9-23022MACHINI GUN MOUNTS POI IOATS

Of'(AATING CABLE ~

~ ~CUVIS COTTVt I

! - . . - ~ '"'" TUH Hue

TUH CUVIS

'iturelO - ....1. rU" 'roc . , aMI I.otcll G,au, fIIf Mow", .....

U ~ I Y E R \ I I Y Of (ALIFOI'NIA


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MAINTENANCI AND . 1 ' ....TM 9230"

--'' " '_ , PULLEY PIN- - : ~ > " ~ " ~ l t V [ I t PI N

u. '0 n N l" " " , . 31 _ Calli. O , . , a " n l l l ~ . Gro"p 0 ' Mov", M41

(6) Auemble front si,ht to the .haft .nd tipten with cI.mpin,handl ..

(1) Lao : l e n bottom tap It tew on re.r ,a,bt hue (fi,. l7), holdincsufficient tension witb the Ittew to keep the . OOK" of the rear a ,h thue and ,uide to&ether.

(8) Coinc:ide the rear .nd front si,ht .:entl!T rina: wires with theupper mark on the t .rtet (step (4) . ~ ) by .dj ... n, rear sipt invertic:al petition by me . . . of the rear s ip t hot.Llin& ~ j .... in, Ittew(fi" 27). Then ti,hten the lower cap I t teW on the rear si,ht be -(9) Remove the I t t eW from the hole marked ' " T E S T I N O .ndI t t eW it into hole m.rked "FIRINO (fi" 29) . Ti,hten the uppertwo up Ittewa on rear sia:ht base.

d. Adjustment of SI8h ll 0 0 Mount. M39 .nd M43. Proce.:l.ure ; 'IIIme . . for the Mount M46 except that only one IWl barrel; ' u.ed.... Remoyal of Counlerba la oee S prio8 When Gun . Ar e

Mounted.(1) Set the mount at m&Iimum elevation and lock it aec:urely.( l ) R emove the Ittews from the pedestal .ac:ket oover plat ..(3) s .ck off oonnectina: rod adjustina: nut one turn.nd I InI t t t !W

the oonnecti", rod rompletely from the CK ..he.d...

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TM 9-23022MACHINE GUN MOUNTS FOR IOAYS

(4) Remo ..e the conne


46/62

MAINTENANCE AND REPAIRh. Remo".1 of B.II Buring Alsembly.

TM 9230"(1 ) Fix a lling approximately 10 feet long through the sight holein the shield and under forward end of cradle, behind the cartridge

case deflector. Hold the cradle and shield at .n angle of about 45degrees..CAUTION: Take care that the sling does not damage the sight.(2) Support the ball bearing housin, on pedestal tube 10 that it

cannot drop by clamping blocks to the pedestal tube ribs. Remove theIiI screws from the bearin, haulinl.

(3) Lift the shield, cradle, .lind socket from pedestal with a hoistor jib.

(4 ) R emove the split ring bearing retainer by inserting the bitof a screwdriver or similar tool into the slot of the ret.llin..,.. Twistthe tool to eXPllnd the ring. Pl.llce shims between retainer and pedes-tal tube SO tbat retainer may be .Iid up and 011' the tube.

(5) R emove the upper inner and outer bearing rings, ~ i n l abladed tool.

CAUTI ON: Bearing rings have hardened surface" Do not Kratchlurfaces be


47/62

TM 9230" MACHINE GUN MOUNTS fOIl IOATS

MAIN TUBE 6RAC1(f PlATE SCREW--

MA IN TVBE 1IIlAC1(f P lATE -

P!.UNGR l OCI( L[v(R ' ~ " ~

-- ~ , . " " l OO ( UVER

..... 'D THIIJ

, ~ . . . . U _ Mer l" ru. . . ..c.ef .PHI ""IIP' t . . . . G . . . . " , MeuM .....

U ~ I Y E R \ I I Y Of (AUFOPNIA


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MAINTENANCE AND REPAIIt

TM 923022 - 23

(12) Test mount for free motion in traverse and correct any un-even tightness in housing bolts.23. REPLACEMENT OF WORN OR BROKEN PARTS.

a. The de.igo Hod construction of the Mouot$ M39, M43, andM46 Hre such that there will be a minimum of replacement of part.worn or broken by ordinary usage. However the following poiots .houLdbe noted at f r ~ u e n t intervals:

( 1) I f the bumper. on the socket of the Mount M46 do not func.tion properly, replace tbe bumper sprinp.

(2) I f tbe cradLe side plHte stop is broken or missiog. it sbouLd bereplHced. Similarly, if the ICreW on the socket, wh ich Sf!rvH to adjustthe deprnsion limit, i. broken, it should be repLaced.

(3) I f the front silthts are bent or broken, they should be replaced.Similarly, broken lens of the rear siltht should also be replaced. Brokenor worn lens retainer 'prinlts should be replaced.

h. The design of the M ount M41 i. luch that replacement of wornor broken parts r ~ u i r H di . . . . .embly of the mount, Disassemble themount as follow"

(1) Remove the main tube brocket bushing cotler pins and thebushings (fig, 30),

(2 ) Remove the clevis cotler pin and devis pin (fi lt' 30),(3) Remove the co tler pins aod then the cable pulley pins andopenting lever pios. WithdrHw the cable operatin.::lever and the three

pulleys (ti.::, 31),(4) Remove the main tube bracket bolt nut and washer (tig, 32) ,H old the plunger lock lever in position on the bolt and remove the bolt.(S) Remove main tube bracket plate and withdraw the plungerlock, spring. and washer (tig, 32) .e. I f operation of the csble operating lever does no t disen.::age the

mount from the fiKed ring, it may be due to any of the following partsbeing broken or worn:( 1) {)perating cable,(')(3)(4)(5)

Cable end link.Plunger lock.Plunger lock lever spring,Plunger lock lever,

d . Replace the broken Or worn part. I f the IOldered joint of thecable is ruptured . it shou ld be resoldered.e. I f the mount cannot be locked in traverse, replace the plunger

lock spring:.f. I f the elastic cord i. torn or 10 worn that it does not supportthe main tube with the cradle and gun, it should be replaced.

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TM 923024-25MACHINE GUN MOUNTS fOl IOATS

s.ctloll VIIORGANIZATIONAL SPARE PARTS AND ACCISSORIIS

Ori;anizational IJPIIre para. _ , .... , _ .... _ ._ .... ___ ........ _ .............. __ ,--- ...... -........ -....... -- ... .... . . __ . __ . _- ... ... _.-.... .... ......... ..

24-. ORGANIZATIONAL SPARE PARTS.

'0 OF e',."

. . A le t of IJPllre para is IUpplied to the Ulilll ann. foe fieldreplacement of thole pam mo.t likely to berome broken, worn, oeotherwile unserviC"eable. The let Ihould be I::ept complete at aUtime. by requilitionina: new para for thole uoed. T ry Nch part oslOOn a. pncticable a fter received, to tee that it fill the m.terielpiopeily. Replace any parts which do not function pioperly. Foelimlll of ora:aniAtional spare parts for the Machine Gun MountsM39, M40, M41, M43; lind M46, tee pertinent Standard Nomenclature Lilt.

b. COTe of spare para i . covle!"ed in the tection IV of this manual.25. ACCESSORIES.

a. Acceu,riH include the tool d equipment required foe luchdi. . lembly and allembly os the usina: arm. are authorized to per.

AMMUNIT ION CHUT lCAL .SO. Ml !

' /sura 33 _ 04"0_"0 . '0 ' Col ..50 , MltCh/n. GUn , , . . , .,,,/ M.u_MD , M43, lInd 11146.. Or > If.V E ~ \ l T Y Of CAlifORN IA


50/62

TM 9230"tIOANIZATtONAL S1'AII PAITS AND ACCESSOIIES

9,

,i!,-~--

!>il;!


51/62

TM 9.230" MACHINE GUN MOUNTS FOtt IOATS

f lll",a 35 _ Ca nva . Cava , fa, rw ln Cal. . so, Machlna Glln,,.edalfal Malin' M46form, and for dean in , a nd proervin, the mauna. A ~ ohouldnot be uaed for pulPO:'!. other than thoae prHCribed, and when notin u.e ahould be properly .tored.

h. There u. a number of aC If.E ~ \ l T Of CA lifORNIA


52/62


53/62

TM '230" MACHINE GUN MOUNTS FOIl IOATS

f lgu,. l6 _ C(ln ..c,. Co.... 1(1' C(li ..so, M(!C lt/n. Gun,Potd. atal Moun, M l' 0, M4l

conlltructed from weather-ruistant o!iYe-drab canyas materiaL Se ..-eral pieces of heavy cord uiled to lace the rear .nd under side of thecoye .. accompany the m.tet"iel . TheH coye .. are IlM!d to protect theluns .nd mount. when not in Ute or when t r a y e l i ~ Thi. cover (6.1-36) i . uled when the cal. .50 w.t ... cooled or c.l .50 air(:r.f t m.chinelun i. mounted on the c. l.. 0, M.chine Gun, Pedest.1 Mount M39or M43.

(3 ) 3-oUHCE PuSH-TYPE PREssURJI: LUaRICAT ING GUN. Th i l ilast.andard hand, puah-type lubricat inl lun (6.1- 36) uled to lubric.tethe yarious lubric.tion 6.ttinlL When not in use or when traYelin"the CUaM! lun should be kept in it . proper pl. ce (6.(t. 36) on thepedesta l mount.

52 0.'9' .I/romE ~ \ l T Of CA lifORNIA


54/62


55/62


warm water, or an equiyalent solution, then rinsed with clear water andwiped thorou"hly dry. I f the materiel is in fair condition and marredonly in spots, these places should be touched up with ENAMEL,synthetic, oliye-drab, huterleu, and perm itted to dry. The wholesurface should then be sandpapered with PAPER, flint. claq B,No. 1, and a finish coat of ENAMEL, synthetic, oliYe-


56/62

PAINTING

TM 923029_ 30

(4) Tests indicate that repainting with olive-drab paint is neeeS5llry once a year and with blue-drab twice a year.30. REMOVAL OF PAII'IIT.. After repeated paintings, the paint may crack and scale offin places, presenting an unsightly appearance. I f such is the case,remove the old paint with a lime--and.lye solution ( ~ T F 9850for details) or with RE MO VER. paint and varnish. I t is importantthat every trace of lye or other paint re mover be completely rinsedoff, and thaI the equipment be perfeetly dry before repainting isattempted. I t is preferable that the use of lye solutions be limited toiron or steel parts. I f used on wood, the lye solution must not beallowed to remain on the surface for more than a minute before it isthoroughly rinsed off and the surface wiped dry with rags. Crevicesor cracks in wood should be filled with putty and the wood oandpapered before refinishing. T he surfaces thus prepared should bepainted according to directions in paragraph 27.

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57/62

TM 923031MACHINE GUN MOUNTS FOR BOATS

Seclion IXSTORAGE AND SHIPMENT .... ,, '

~ p a r a t i o n for shipment.. .,Crating of mounts .. .Storage instructions ..... .31. PREPARATION FOR SHIPMEl'IT.

313233

. wne Tal. The preparation of the mounts for shipment and lorstorage is the same.

h. Lubrication . Lubricate all mount . as directed In the lubrication instructions section IV.

e. Pail>!]ng. AU painted surfaces that have bKome checked,pitted. or rusted, shall be thoroughly cleaned with CLOTH, abrasive,aluminum-oside, removiog all rust spots, Re paint cleao surfaces, applyiol!: ENAMEL, synthet ic, olive-drab, lusterless.

d. Cleaning. Clean all unpainted surfaces thoroughly with SOLVENT , dry-cleaning, or with soap solu tion as follows:

( I ) Apply SOLVENT. dry-c l .anio&, by scrubbing with a brushor wiping with a cl .an saturated cloth.

(2 ) Apply soap solution by vigorously brushing or scrubbinl!: thesurfaces thoroughly unti l al l traces of contam inat ion have been removed. T he surfaces shall then be rinsed with cl .an hot water, anddried thoroughly.

( 3) Avoid contact of bare hands with the cleaned surfaces.e. Prefeo'alion o f Mount.(I ) ApPLICATION OF R U 5 T _ F R E V E N T I V ~ 5 .NOTE : Appllcation of preventives shall be performed immediately

aft .r cl .anio&-(a ) Apply coating of COMPOUND, rustpreventive, thio film,

to all unpainted surfaces of the mounts from which the compoundcan be removed without difficulty. and from those surface. fromwhich it is not necessary to be removed.

(b) COMPOUND, rUlt_preventive, light, shall be applied hot toall surfac .. from which it would be difficult to remove the preventive,(2) GeNe RAL IN SPECTION. A systematic inspection sha ll be

made prior to shipment or storage, listing all broken or mi.in!': itemsthat are oot repa ir . d or replaced. Attach this list to the mount.

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58/62

STOITAGE AND SHIPMENT32. CRATING OF MOUNTS.

TM 923032- 33

a. Contlruelion. Crating_hall be in accordaru::e with IOSSC(a) ,Introduct ion to Ordnance Storage and Shipment Charts, Se< C pal>


59/62

TM 9230" MACHINE GUN MOUNTS FOil: IOATSs.ctlon X

REFERENCESStandard nomendatU' lilts .... _.. "Erplanatory publications ..34. STANDARD NOMENCLATURE LISTS.

a. Clean;nll. Pre8erv;nll. a nd Rep air.Cleaning, preservinl and lubricating materials;recoil Huids, special oils, and m i ~ l l a n e o u s re-

lated items , .... , . , . " ... ." ., ...... .... " .,.".,. . SNL K-lSoldering, brazing and welding material. gases

and related items "........ ...... .".. ___ ............ SNL K -2Tools, maintenance, for repair of automatic guns,

automatic ~ n antiaircraft materiel, automaticand semiautomatic cannon, and mortar-. .... ., . SNL A-35

Truck, small arm. repair, MI . __ __ _ _____________ SNL G-72Truck. 2'/i ton. 6.6 small arm. repair, M7 andM7Al , . ,. , .,." ." ... .. "" ... ". , . , . .. ....... , . , . . _ .. ,. SNL G-138

h. Gun and Mount Materiel.Gun, machine. CIII. .50, Browning, M2 , aircraft,basic . ..... , ......... " .. .. , . , ... ,. , .

Gun, mad,ine. cal .30, Browning, M1919A4, fixedand fl ... ble; M1919A5, fixed; and M1919A6,llexible ., ., ' . , . , . , . , .... .......... , . ,. ,' .... , . " ., ..... ,. , .

Gun, mllcb;"", cal. .50, Browninl, M2, water-cooled, lle.ible; and Mount. , .. ,. , .. ... , .... ,

SNL A-38

SNL A-6SNL A-37

Mount, bracket, M40 ... ,. , .... , . , . , ....... .. ." .. ,." .. ..... SNL A-55M ount, pedestal, machine IUn, cal .50, M39Mount, pedestal, machine gun, cal. .50, M43 .....Mount,

M46pedestal, machine gun, twin, cal. .50.

Mount, rin" machine gun, cal. .30, M41CUTTent Standard Nomenclature Lilts are a. tabu.lilted here. An up-to--d. te list of SNL's is m.in-

t.ined II the "Ordnance Publication. for Supply

Sec. 31SNL A-55Sec. 33SNL A.55Sec. 33SNL A-55Sec. 33SNL A.55Sec. 27

Ind . . now published in ... " ... , _..__ . _ . _ _. . _ . OFSB 11

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61/62

TM 9-230MA.CHINE GUN MOUNTS FOR IOA.TS

INDEXA P No .

"diu"men . . ,.....dlet of mount M U in

hoti .,.,t.1 pl.ne l 8 - < l. ;,M .,., mount M19 and M U U. i ,h . on mount M4 G..... ..... ..... 40-


62/62

TM 9230INDv(

III - Con"" ' .... Me.Moun. mach i .. ,U". 1'.0 . . . ,M39. M43 nd Moe.ho,acu, i" i . ........................ _...... dnc:, ip' i"" ond func.ion'n.ba.1r ot,.p . . . ,mbl, ......... ....... I I. "d I ..,mbly .......... .. ..... ......._.... 9pe

tm 9-230 'machine gun mounts for boats' (1943)

Documents