PS Magazine Issue 100 1961 Series [100 ed.]

Citation preview

10 snap while you're standing in spec lion ...... unless you failed to replace a

"Bad breaks ", as you us ually see after you pick tip (Ill the pieces, hardly ever iust IIlIPll('lI. Bad luck ....... [rom a. brok e n boot lace 10 a fizzled miss ile ....... is usually f(lus(>d, by some sort of goof-off. No boot [a ce, f'r instance, is likely

frayed la ce wIlen you }irst noticed iL And your equipment'll hardle el1er co nk out in the middle of a mi ssiOfl-unless you failed to pull til e PM need ed fo kee p it in shape to operate.

, One of tho fo"t fact s 0/ life is that a mon mostly makes his own luck.

THE

PREVENTIVE MAINTENANCE

*

MONTHLY

Issue No. 100

1961 Series

Published by the Department of the Army for the [nlorml' tion of organizational maintenance and supply pers,nnel.

Oi~tribut1on is mad.e tl'lrough normal publication channels. WIU'lln limits of aV~11abmty, older lssues may be obtained di·

reet from PS MagaZine, Raritan Arsenal, Metuchen, ~ewJersey.

IN THIS ISSUE ARTICLES Features DA Form 478 S.;int(fla Connectors, " •.. Jerry Cans: Be Your Own Inspector Capping Compressors Aircraft

Page . 2 . 4·5 . 45·47 52·61

~ir~9~J(tl~g~ishers

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19

' . ' " •.• , ,. 20·22 Replacin g Accessories " "1'"' ,•• ', . 23 Communications Equipment Receiver Transmitters RT·66, 67, 68/ GRC • • 27 Receiver Tram;mltter RT,66/GRC 27 AN / MPQ·4A .• t 0/' 28 Missiles Computer & Recorder Group Checks, • 49 Oon't Wax Missiles ' , ' ,,,,,. • . 49 Magnetl'l)n Return Tube Info Sheets .' 50·51 .lero Sel Switches • ": ." .. , 64 Wheeled Vehicles G742·series Trucks , .• ' Winches '" MI08, M62 Wrecker 114246 5·lon Wrecker Tracked Vehicles 'M48AI Tank ."., 9 0/

E~_:E::~o~:~~» {;: ,,,i~::.

srwp while you're standing in spec ' lion ....... unless you foiled to rep/eKe a frayed l(lce when you first noticed iL And your equipment'll hardle euer conk out in the fnidJle of (I mi ss i on~ unless you foiled to pull til e P f\1 needed to keep it in shope to operate.

39 " , 64

~~~~~~$ide Gas & Wate~o/tao/n'ks :;"::" M3A3 Smoke Generillor " " M4 MecMnical lubricator' , . " . M3A3 Oecon , .$., Ml Rifle , 1 .. , , " -," , ""." Identifying Small Hardware Items "

10

"Bad breaks", as you usually see after you pick tip (Ill the pieces,/lardl y ever iust IIlIPll('lI. Bad luck ....... [rom (l broken boot lace 10 a fizzled missile ....... is usunlly fCIUS(>d, by some sort of goof-off. No boot lace, f'r instance, is likely

, One of the Fiest facts

0/

fife is that a man mostly makes his own luck.

9·39

' .'

Continental Engine Fuel Injector Pump . General Adjustable Wrencl'les • Batteries ,, '. , •. DA Form 460 Symbols . M30 4.2·lnch Mortar New Publications Standard Form 91 '0/ Oxygen Acetylene Flttmgs ',_" "

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6 10 11 13-lB

26

38 39

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41·44

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63

DEPARTMENTS

"Vhich simply means f/lat the best way to make your own luck good is to d o each maintenance job right, and do it in lime. Like the lucky bird said, when somebody growled because he go t th e breaks-"Yup, the harder I work, the luckier 1 ge t."

Connie Rodd Joe's Dope , , , , Question and Answer

Contributions . .

Connie Rodd's Briefs

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7 29

, . .• 37 62 , .• Inside Back Cover

PS wants your ideas and tllntributjlns,lnd is &lad 10 Jnswer your questions. Names and addresses areJltpt in confidence.

lust write 10,

s"t .llaIj-Mad, PSM~,

fI..a...,Q.....,u, M~,h_I_· OISTRI8UTlOH,

In acctrllance with rtquiremtftls IIbmitttd en DA hnn 12..4.

1961 Series Published bytbe DelJirtment of the Army lor the informa, tionolorganizalhlnalrnaintenanceandsupplypersonnel. is made through normal publication channels Wlthm limits of a~ailabilit~, older issues may be obtained direct from PS Magazme, Rantan Arsenal,Metuchen, ~ewJersey , Di.str.jbu~ion

IN THIS ISSUE ARTICLES features OA form 478 • Scintilla Connectors. • . JerryCans: Se Your Own Inspector Capping Compressors Aircraft H·190

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Page

.

2

. . 4·5 . 45·47 52·61

19

Hre £~tinguishers 20·22 ReplilCInS Accessorjes •.•. 23 Communications Equipment Receiver Transmitters RT ·66. 07. 68/GRC . 27 Receiver Transmitter RT, 66/ GRC . 27 AN/ MPQ·4A 28 MissIles Computer & Recorder Group Checks 49 Don't Wax Missl)es , . . , , . • ,. . 49 Magnetron Return Tube Info Sheets , 50·51 Zero Set Switches . 64 Wheeled VehIcles G742'series Trucks , 7 WinChes , . . . . . . 8 MIOS. "'162 Wrecker . .. • 38 M246 5·ton Wrecker , 3&40 Tracked Vehicles • 9 J ~~rl~ank "".",,", '.'.\;' ',:" . 9 ·'39

~~.;:'l~o~:~kS

~.?~" .. ,

• . .. . . •.. Continental Engfne Fuel Injector Pump General Adjustable Wrenches 8atteries .. , VA form 460 Symbols M30 4.2-lnch Mortar New Pubhcations Standard form 91 . .

~~~~:;;~:::::::I:::er Tanks: : M3A3

Smoke Generator, ", ,~ , ;'"',,.,. M4 Mechanical Lubricator •• :~~",.','.'_ ~,,,.,

39 .2 64

6 10 11 , 13·18 26

38

!~

423

.. 4~1

m:~i:~::;maH Hard'w~;;~-~'~l:-~~:~t?,~." - 41'~ DEPARTMENTS

\ V hich s imply mea ns that tlte bes t way to make yo ur own luck good is to do each maintenance ;ob right , anddo it in tim e, Like the lucky bird sa id. w hen so mebody growled because Ite go t the breaks - " Yu p. the harder I work, the lu ckier I ge t. "

;~~j'o~~d

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Question and Answer Contributions . , . . Connie RocId's Briefs

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::~ ~." •.

:

i

J

37 62 InSIde Back Cover

PSwantsyourideasandcontributlonS,andlsaladtoanswer yaur questions. Names and ad1lrenu arekfPl in confidence. Justwrile til'

Sdy that worries about the appearance of a 478 jacket (except for being able to read the entries) is just forgetting that it's a form meant for use in a shop - and it's going to get fingerprints and grease smudges. Any time a piece of equipment gets an additional 478 because one is all filled in, you must put the old info into the new jacket. You can do this easy enough by cutting the old jacket apart and stapling jt in the new file.

the info on the jacket any time you get some equipment back from your maintenance support outfit. 2

"ORGANIZATIONAL

The title says it! You'll also find it in Change 3 to AR 750·5 (Maintenance Responsibili. ties and Shop Operations). And everything else points to it ... the lI sing unit is responsible for the care and keeping of an item's vital maintenance and inspection records ... and that includes cost information. So, watch yourself, friend ... take care of your equipment's 478's and their contents. [('II pay you to be extra persnikity about the clarity and com· pleteness of the info on the jacket itself. And, for goshsakes, never toss out a 478 JUSt 'ca use it's all filled·out,

I

Anybody that worries about the ap· pearance of a 478 jacket (except for be· ing able to read the entries) is just for· getting that it's a form meant for use in a shop - and it's going to get finger. prints and grease smudges. Any time a piece of equipment gets an additional 478 because one is all filled in, you must put the old info into the new jacket. You can do this easy enough by cutting the old jacket apart and stapling it in the new file.

You don't have to be ugly about it , .. but, if your support outfit is ever careless ... or · forgetful ... about the way they fill in maintenance info on the jacket file ... be sure to see 'em about i.t ... ask for a correction, or whatever's needed. They're just as intersted as any· body ... maybe more so ... in guarding serviceable life. . and the maintenance info on the jacket p lays a mighty pow·

piece of equipment you use. In some places it's SOP for the unit to check out the jacket entries (against

spector, or supervisor, before a vehi· cle's signed for and returned to duty. The support unit may be responsible for entering information, but the using unit is responsible for the overall record and its completeness. And another thing. You'll see space on the back for cost info. Your support unit fills that in only if your Army Com· mander gives the word that he wants it kept.

you'll ever the info on the jacket any time you get some equipment back from your main· tenance support outfit. 3

"ORGANIZATIONAL

You don't have to be ugly about it ... but, if your support outfit is ever careless ... or· forgetful ... about the way they fill in maintenance info on the jacket file ... be sure to see 'em about ir ... ask for a correction, or whatever's needed. They're JUSt as intersted as anybody ... maybe more so ... in guarding serviceable life ... and the maintenance info on the jacket plays a mighty pow-

erful role in helping the tech service people decide the fate of each and every piece of equipment you use. In some places it's SOP for the unit to check out the

spector, or supervisor, before a vehi. cle's signed for and returned to duty. The support unit may be responsible for entering information, but the using unit is responsible for the overall record and its completeness. And another thing. You'll see space on the back for COSt info. Your support unit fills that in only if your Army Commander gives the word that he wants it

kept. 3

Too tight can be worse than tOO loose when you're inserting a Scintilla-type waterproof connector. The Scintilla is the ring-and-sleeve gismo that connects to control boxes, junction boxes, generators, regulators, starters, and some magnetos.

'l? • •

If you slrongarm this (onnector and twlsl II up 100 tight. you'll be slrlpplng threads-then Vibration Will shake the connection loose on a dark mght four miles from nowhere

- ~-0-~ \1 .,.,

And If you treat It too kindly, you don t get enough torque to seallhe grommets Then you Wind up With a loose, leaky connection thots likely to fad at an embarraSSing lime

4

-

Too tight can be worse than tOO loose when you're inserting a Scintilla-type waterproof connector. The Scintilla is the ring-and-sleeve gismo that connects to control boxes, junction boxes, generators, regulators, starters, and some magnetos.

n '2

- ~--

•

\

-t

If you strongarm this (onnector and twist It up tao tight, you'll be strlppmg threads-then vlbratlan will shake the connection loose on a dark night four miles from nowhere

..

So, first make sure there's no oil or grease on grommets, to spoil the seal, nor any grit to grind up the threads on that soft metal. If ring threads arc real dry, it's OK to lube 'em sparingly with grease, Aircraft and Instrument, MIL-G-3278, Symbol GL. FSN 9150-261-8297 will get you an 8-ounce tube. Wipe off any excess lube. Then screw up this connector with a firm but gentle touch. If threads start to cross-back out fast, and come in slow and easy.

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2. Then take the ring up another Va-tumno more-with an adjustable spanntr.

And If you treat If too kmdly, you don t get enough torque to seal the grommets Then you wind up with a loose, leaky connectIOn that s likely to fOil at on embarrassing time

3. To seal the (onnedion. turn the sleeve up fa a firm. fingertight seat on the ring.

4. Then take the sleeve up another l/a-turnno more-with a strap wrenm, or a strip .f webbing and pliers.

,

Now you've got what you need-a waterproof seal with the rubber grommets under JUSt enough pressure to prevent leaks. 4

but gentle

So, first make sure there's no oil or grease on grommets, to spoil the seal, nor any grit to grind up the threads on that soft metal. If ring threads are real dry, it's OK to lube 'em sparingly with grease, Aircraft and Instrument, MIL-G-3278, Symbol GL. FSN 9150-261-8297 will get you an 8-ounce tube. Wipe off any excess lube. Then screw up this connector with a firm but gentle touch. If threads start to cross-back out fast, and come in slow and easy.

2. Then toke the ring up another If.-turnno more-with an adjustable spanner.

3. To seal tbe connection, turn the sleeve up to (I firm. fingertigbt seat on the ring.

4. Then take the sleeve up another 1f.·tumno more-wifho stnfp wrench, or a strip of webbing and pliers.

Now you've got what you need-a waterproof seal with the rubber grommets under just enough pressure to prevent leaks.

YOUR ADJUSTABLE WRENCHES... I") DON'T GIVE THEM A

.... ' "

...

prrl.\1..... ~--.",

~L

I))

\'X' hether thinkin' , doin ', wonderin' , or just messin' around, there's usually two ways to do a job. One's right, the other's wrong. The same goes for adjustable wrenches, 'ca use there's a right and wrong way to use 'em. The right, fitting and proper way means:

1. LESS WEAR 011 THE WRfH(H. 2. LESS DAHGBt Of SUPPAGt 3. MOllE AND SAfER LEVlrAGt 4• .IDS CltANC£ Of DAMAGING THE HUT.

S. TlGHT£It FIT. If NEEDED. 6. LESS HUffiNG. PUffiNG AND kNUOOE·BUSTlNG FOR

rou.

\

In other words ... adjustable wrenches shouldn't be used so's the "pull" or "force" is beamed on the adjustable jaw. Ie's the stationary jaw thac's rigged to take the heavy scuff.

0

0

6

Vibration can score a knockout on ported by a bracket, there's likely to be tcoublc. These brackets were supposed t to be remoycd, like it says in MWO get deadlined with cracked exhaust Oed G742·\X'28 (25 Sept 57) , leaving manifolds, take a look underneath 'em. JUSt the bracket that supports the cailIf you find the rear exhaust pipe sup- pipe. Seems, though, some vehicles are still wearing the rear exhaust bracket.

your vehicles. So, before your G742-series trucks

~RE ME A COU. PLE OF

T".

_~

YCXJ)

SNAG.S MAY PUN INTOt' . ~~~

RemO'ing reore,hlllKl bf~:I: FS~ 2990.731-3080: ~";· ctmn9,d 10 · . ~I{~JI a depot job by (haage 1 112 Feb 591 10 Ihe MWO. So, before you toke ij ( ~ ~

\~, ~·.L*~~~~'J::~~~.r?~~~w~ ,~'T- ~. ~~'.

. t1 ,

.'

The MWO mentions OnlY. vehideswith a tailpipe broc:ket thot ,wears FSN 2990·736·8636. Your vehide may hove an older broI

TOP VIEW OF

IOTTOM

110

01

l'\Eu.c!u._ _ _ _ _ _.....

ALL MEASUREMENTS IN IN(HES The two pieces of lumber for the goes with the four parts that make up slide assembly can be held together the support for the elevating and rewith four nails or screws. The same coil group. 15

About those straps and buckles. .. you can fasten 'em to the supports most any way-with staples, nails or round-

head screws. If the straps and buckles are hard to come by, remember that two pieces of rope tied together will work pretty good.

This drawing shows the brackets that - along with the tailgate when it's dosed-keep the support for the muzzle end of the tube in place. They're made from IO-gage flat stock. BfN0 90"

CUT

81N09 0

11 · rOJ • t2:11 r:1 II 0

0

1- 6 -+S-+- 1 -+- 1 -! 11

•• And this drawing shows about where the holes go for the bolts to pass through from the differem supports. Those loops memioned for the wheel wells can be "U" bolts. drawer handles or something that you can whip up to do the job.

"n~ ':t~:'~:"~ l~ '''2\2, I--- 2}'1

~~ HOU\ ltV

... _

.

rr-:-;-;;r_lI_*._-1~""'_ _____""

,.,

~ HOUS fOIl LOOPS fOR RlotE ASSE MBlY

WHHl WEll

TRuekam

,

~:?f ~

WHEEl

WEt[

11

LHI-L

~l~ . .... ...... _ ... _ _.~fl ••• T All MEASUREMENTS IN INCHES T' •• 16

~

Once you have everything madeand it all tits-here's how you put it

FRONT SUPl'ORT

together.

Am 01 0/1 ... yo. wont to .ffck the nu" in lb. ,ounter· stmk holes on the bottom 01 the lower piece lor Ibe Ironl support. Then flip ~ o'er (making sure Ihe nm don'lloil ,~ out) and line up the two outer holes with the ones in the #I;;i-;; - - ':;'-- --,!;.1-,,-- .... tru,k bed. N.xl ... put the 16-;n boh< in lhe outer hoi" P~r-...:r and hove some guy go under Ibe truck 10 lighten Ibe _. TRUCK BED Stick lhe lS';n bol" in the two