PS Magazine Issue 055 1957 Series [55 ed.]

Citation preview

Uncle Sam's got two mighty important things that make his military forces potent: You and your equipment. Just how potent depends on the condition in which you keep yourself and your equipment. For you, there's training, exercise, rest, good food, and all the things you do to keep in tip-top shape. For your equipment, there's one big thing that's the real key to how good your equipment is-and how well it'll fight-Preventive Maintenance. It's the right kind of care, cleaning, lubing, adjusting and handling you give your stuff. It's knowing and following the in's and out's of your equipment'S TM, LO and supply manual. It's knowing your equipment's tools and how to use them right. It's following all the details of the right kind of operation of your equipment. That's right ... Preventive Maintenance is how you keep the \Vocld's Best Equipment the best. So, with your equipment (and yourself) in top shape, you'll be ready to do your job ... no matter where or when . Result? A real potent Army.

Be Y~vr ()w,. Inspector Makh Your Batteries Care and Handling of Ammo (Cartoon SeCtion' Dump TO'Ud< Canv... Kit Rammer Trouble on 155-mm Howitzers

Forms Holder fO' MHE

~

New Way to Use OA Form 461 Connie Rodd Half-Mast"'

Armament Chemical Quartermaster

Engineer Contributions Can"i. Rodd', Briefs wants your jqeas and contributions, and is glad to answe( your

. JUst writ. to, Sf! Half-Mast, ps. Raritan AflORa'. Melu.....

Ie,.." Names and addresses are kept in confidence.

Ie Your

are the things an inspector will probably hit when he goes over your vehicle. The pictures show the G749series 2Y2-ton truck. You can also use them when checking over your G742 2Y2-tonners. They'll put you on the right track.

jfor tbe J)riber

The tools you'll need for this are a tape measure, a tire pressure gage, a hydrometer, a pair of pliers, a screwdriver, and a differential plug wrench with an openend adjustable wrench.

Be Your . Here's a h.andy guide you can use when you're checking over your truck. You'll see that these acc the things an inspector will probably hit when he goes over your vehicle. The pictures show the G 749· series 2V;z-ton truck. You can also use them when checking over your G742 2Y2-conners. They'll put you on the right track.

jfor

tbr 1Drtbrr

The tools you'll need for this are a tape measure, a tire pressure gage, a hydrometer, a pair of pliers, a screwdriver, and a differential plug wrench with an openend adjustable wrench.

Ow. t..,ector

WII&lS-I.uIJe or brab fluid leaking. S1UDS-Ient. brobn. 11M and WI fWlGllIUtS1Iiuing.

'lalS-SooooIh WOlD ....... "" to laIIric. ...... _ . 'AlVIS-No! propedy positioaed IsIoaoId poInI away ~ vtfIidel. On dual joIK. YaIvt siems not properly positioaed IouIside duaI-points in lowant vehIde; Inside oway from ,ohIcI. and val... 180· ....... oat another). 1Mort", tin pr_ (correct :..........sIngIe.find tnKkS. 70 PSI when """; duo'· ...... 1Mb. 4S PSI when cold).

"'-poInts ...

rusted.

WIIIIlS-luI>t or IIroke fluicllealdog.

S1UDS-Itnr, brobn. RIM and WE fUNGI NUTSIIming,loose. lUlled.

..... tread, "" .. 1Uric. __ wear. YAlYlS-Not properly posiIionod Ishould poiII away .........,. On dual iths, ..,.. st.... not properly ........, louhIdo duaI-poiom in ,••anI "hide: insido 4Iof.-polnts out away from YIIIId. .1Id valves 180° 0fIII0SII0 one another,. tire pressure 1 _ ~ 1Mb, 70 PSI wilen coicI: dual· .... 1Mb, 45 PSI .... ,aWl.

_til

'lA1"IEIIS """ (0fIIItt'II8IIS. L...., .....'" _,

1oeI"""

slots m._ ........... tmiIY

1IeIow1.22511180 ............... otufe,- . . mIssilI!Jord4ft04,

,.".detI I"IIIlneI..... ,..n.

6

UI1EIIIIS .." COIIIIKIICIIIS-I

l_. /oaItewl ..... level !III II slob wells. ".aIk 10 _

povIIy

below 1.22~.at.804.." ....... at.. ,orr..... IIrlIriooI. posts.

·.-_lIIIsIIotordftlet!. a"

7

1IIAHRAIIE-II6I ....... rie/lilltst.l.hIl

duIdIC8IIIreIIm< ............. t ... _ .... !edt balr,:JOIoIt ", 11ft"I1Is" ........ 3: Put PIG ' - ill 1 *~o. 3-11.80 vohs1 ~

L

~~~~:, ~'~!hrn~~oIh. , 1

~~~~Here's another _alles!: Three 6TH's were checked of 50 amperes~~~~ drow. They come oul:

To do Ihis lhey'li use:

You can see that the proper team would be No.1 and No.3. Even tho No.2 is getting dangerously close to the end of its useful life, this No.2 might be paired up with another battery in the 9-volt range, but only for a vehicle that's not subject to emergency call, and that won't be needed in cold weather-otherwise, better turn it in. Now, what about tanks? Same thing applies. It is best to keep all four of your tank batteries matched as closely as you can for the same reasons. This will make for lots of work, but it will save batteries. Careful-to be accurate, all these tests must be made with the voltmeter leads connected directly to the battery posts, by prods, if they are at hand, and not to the carbon pile resistor's cable clamps.

~NO.l-lI ,011~ "'n.1

. ~ NO. 3-11.2,0Its.

or .. . use the NEW low-yoltage circuit tester (FSN 6625-092-9136). Or any more sensitive equipment they happen to have in their shop. They hook up the low voltage circuit tester so that they can draw current from the battery through the load bank, and at the same time measure the vo1cage. They draw half the rated capacity of the battery-50 amperes for the 6TN's, 22Y2 14

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amperes for the 2HN's- for about 30 seconds, to allow for superficia l differences and let the battery outp ut become constant. Then they note t he voltage, w hich w ill be somewhat less than the no-load vo ltage. T hey m atch the batteries in p airs w hich have as nea rly equal voltages as possible, w ithin the n umber of batteries they have on hand. The closer the voltages are, the morc evenly matched the batteries.

_____ Her _ .. e"...an example of odual t_.._I,_0_"_'_ou_'_2_HN _ '_'._ _ _ _ _ _oI T here's no perfect match, hut yo u can easily see t hat the best teams w ould be N o.1 and No. 3 for one pair , and No.2 and No.4 for (heather pair. This second p air m ay not last as long as the fi rst'pair, h ut it's an odds-on bet that pairing t hem like this will get yon better service than pairing No. 1 and 2orNo. 3 and4wou ld.

:~ NO.l-ll.1s,ol"· 1 ~No. 2:"l iYolls. l ~No.3-11 .8o,01"1

~1Io. 4-abit~.., lTvohs.j

Hfie', ono!her aduall..l, Th' ee -6TN ....'-' w - .-re'"",he - ,"ked "'"" at SO amperes draw. They ,ome oul,

~NO.l-lI ,01t,even.1

Yo u can see chat the proper team wou ld be No. 1 and No. 3. Even tho No.2 is getting dangerously close to the end of its useful life, this No. 2 might be paired up with anocher battery in the 9-volt range , but only for a vehicle that's not subject to emergency call, and that won 't be needed in cold weacher- otherw ise, better turn it in. Now, what about tanks? Same thing applies. It is best to keep all four of your tank batteries matched as closely as you can for the same reasons. This will make for lots of work, but it will save batteries. Carefu l-to be accurate, al1 these tescs must be made with the voltmeter leads connected d irectly to the battery posts, by prods, if they are at hand, and not to the carbon pile resistor's cable clamps.

~NO.3-11.2'.II'.

15

3. Send the whole kit~ and-caboodle the Chief of Ordnance, Department of the Army, Washington 25, D. c., ATTN: ORDFM_ to

Every time one of your bacceries dies young or it does something it shouldn't, why keep it to yourself? The details of this flip can be put to real-good use by the design peoplethe ones who make those batteries_ By knowing these details, the design people will be able to make beccer bacceries for you. Your voice in beccer bacceries is the UER (DA Form 468). It tells the people up there just what's happening to your batteries _under the conditions you're operating. Here's how to get this poop to the right place when your baccery conks out too soon: 1. Get a UER and fill it out like it says in AR 700-38 (Nov 55), telling what kind of area you're in - weather, terrain and so on. 2. Get the service date stamped on all batteries off the case. If you're using the old UER Form (dated 1952), put this dope in the "Total Time in Use" box. Got a new 468 (dated 1955)? Then, put this service date in the "Details" column.

Rust can wreck equipment just as bad as armor-piercing ammo does. It may be slower, but the destruction will be just as complete. But did you know that when you can't g~t to the rust for awhile, because of other important chores, you can coat the equipment with rust-arrester and this'll hold it until you can get around to it? FSN 8030-231-2349 will provide you with one gallon of Rust-Arresting Coating. FSN 8030-231-2344 will get you a five-gallon can.

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Before applying the stuff, wire-brush or sand t hose loose flakes of rust. The coating will last about one year. TM 9-1007 gives you all the dope on the rust-arresting coating. Remember: The coating is only temporary. It covers the rust with a sofe film that won't act as a base for paint. When you're ready (0 paint, you've got (0 dean the rusted area down to bare metal. The thought of all that extra work makes you want to be sure you haven't time to paint the equipment right away.

An armored division took a long hard look at its M59 Armored Personnel Carriers recently and found that a third of them had bent transmission control rods , (G280-8341345 and G280-8341347). ·Causewhy? ·Causeo· big feet. Yep, the boys had been stompin' around in there like a herd of mul"es... _~__.....~_ _~

Now you're no mule, likewise no jackass, so of course you're careful where you drop your boondockers when you're slippin' into tbe saddle of the M59. But maybe some of your gang aren't quite so sharp, SO please to remind 'em about not stepping, standing or stomping on those control rods. The situation is going to improve, however, because there's a new cover coming that'll protect these rods.

Comes the light - hut it isn't helping the gunner to get on target when he aims through the M20 series periscope in the M48 and M48A 1 tanks. The light comes from the gun-ready indicator and ie's a pain in the eye. But, there's a way to cut down the light. You know that red enamel used on lubrication fittings and oil cups? Requisition Eng Stock No. 52-3473.700.003 and you' 11 get a pint of the stuff. When the paint arrives, dean the end of the indicator tube with some dry cleaning solvent or paint thinner to get rid of dirt and grease. Then ... with a soft brush in hand . . . apply a thin, even coat of paint (0 the end of the tube.

You can see what kind of job you're doing by painting with the light on. You may need two coats (0 get the dimness you want.

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Bottoms up. 'Tain 't so good if it happens to be the pioneer tool rack on your truck. 'Fore you end up with a bent rack, and 'fore you lose your axe, better cast an eye on that rack to make sure yours is not one of those that've been installed upside down .

RACK INSTAllED UPSIDE DOWN Will BEND

SHOULD LOOK liKE THIS

The latest on your different kinds of wreckers - the M62 5·ton, the M60 2Y2-ton and the MIOS 21,1-ton-is that you' ll get a safety shield put on 'em to keep the crane operator from looking like a left-hand profile shot of Venus de Milo. When the crane operator's in the cab operating his shipper, unconsciously he can rest his arm on the armchair-like shipper cradle when the shipper's up. If it slips his mind to take his arm away when the. shipper's lowered, he'll find himself a candidate for a medical discharge. This safety shield will keep him from putting his hand where it doesn't belong. MWO Ord GI·W86 (3 Aug 56) tells your Ordnance outfit to go ahead with the job; it's marked urgent. 18

Take a look at any hydraulic hose lines ... if the outside layer is worn or frayed, chances arc you' ll soon be in for trouble. The reinforci ng wire under th e worn part is open to rusting, and under field conditions the hose may rupture.

Take a squint at your hose and fittings every week for any wear and leakage. If your hose is worn or fittings leak, replace 'em pronto.

The main reason G749 2lh-ton truck manifolds crack is because the studs and nuts get torqued too tight. When your engine heats up, too much torque causes the manifold clamp to collapse, causing little or no clearance between the manifold and its damps. No clearance and your manifold woo't be able to creep as it heats up and cools off. The can be a crack in the manifold.

1. Manifold end stud nu15-2S to 30 foot-pounds. When tightening up on these, make sure the manifold is held right dose and firm agoinst its gaskets.

2. Clarnp stud nuts-IS to 20 footpounds. And NEVER more than 20 footpounds oryou (auld collapse those damps.

Also, that manifold heat-control-valve should always be set like TM 9-8024 says. 19

Tighten 'em up, man , before you fi nd 'em dragging along behind you. T a lking about the prop shafts on your G742 and G749 2 Yz -ton trucks and your G7 44

For 6749 series trucks only use either Nut. self-Io(ki~g. hexagon lOrd Stock No. HOOl40405411 or Nut. self-locking, hexagon I"Hug lock" type) lOrd Stock No. HI01 · 0442800 or HlOl ·044280lJ

for 6741 and 6744 series trucks use Nut. self-locking, hexagon Wrd Stock No. HOOI-404054lJ

Now, if you can't get self-locking nuts for o ne reason or another, bolt your prop shafts up with a regu lar nut, but please make sure you use lockwashers. These' ll do till you ca n get your hands on the nuts of the se lf- lock ing variety .

Been quite a lot of ta lk lately about whether you can or can't get those receptacles, push-on nuts a nd snap-fastene r caps that ho ld the instrument cl uster mo unti ng p lates on the dashes of your G740, G758, G74 1, G742 and G744 trucks. T he word now is that you ca n get the who le shebang . Goeta watch it, tho, 'cause you get those parts from d ifferent services.

n flllllll••••----~--l RKEPJAW-fSII 2510-753-9255

674210."""""'1. PUSII-CIII lIlT -fSII 5310-752·6591 674t

(0rNct, '00). C». SIW' FAS'IIIIIII-fSII 5325·285-3356 IfloaIttnntnItr). !his _ k_ ., Stud 10M SIodt No. 42·5-26900-251; ami lief... that • was .. 0nNnc0 iItm amI_ unoIor On! Stedt No 1tOO2·7S26S9G. 20

22

CAReFUL- ABOOT eusrSD PACK/Ne 9O}(ES... DON'T STACK THe STUFF' 50 CU>SE TO WAU'5 OR. 8AR.R.ICADES THAT AIf:Z IS CUT OFF...

23

26

27

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Dear Half~Mast, Because we don't have the stock nmnber or nomen ctatm'e for ortr M215 2V:? tmt dump truck canva$, we haven't bee1l able to log them into our property and inventory books the right way. The stuff isn't in the SNL's and no one seems to know the proper 1lometlClature and stock numbers. Can YOII help 1tS? ~ Lt L. P. P. Dear Lt L. P. P ., You can now get that ca nvas as part of a kit. If·you have to order i't , t he kit's FSN is 2520-834 -5215 . T his kit also has some other gadgets, such as canvasattaching gismos and racks you can use in your dumpers as troop seats. Here's how the kit breaks down: Body paulin ltarpaulin, body assemblyl-FSN 2540-521-6182 (G7491. Front end curtain (cover, dump body cab protector, assembly' -FSN 2540-521-6181 (G7491. Rear end curtain (curtain, body end, assembly) -FSN 2540-521-6180 (G7491. Top bow (bow, lop piecel-FSN 2510-293-4730 (G7491. Side bow (bow, side, piecel-F5N 2510-521-6183 (G7491. Rack and seal, assembly-FSN 2510-521-6184 (G7491. Hinge, Iroop seal-FSN 2540-521-6179 (G7491. Pin, hinge-FSN 5315-737-0134 (G7491. Bow, corner assembly-Ord Slock No. HOI7-0540404. Strap, bow-roll-Ord Stock No. HOO3-0545558.

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Dear Hdlf~MastJ Some time ago ,)'011- were talkiug about cleanil1"g spark~plugs . Remember, you told us to OP61J.l1-P the electrodes and file. the Imd of the CCfJter 'wire clean and flat be/ore we set the gap? IVett, I gotta d(tmit it-I tho#ght that-was so mtech bunk. Y OIt k ,tOW, theoreticalperfecti01t, hili 1tot for bllSY men. By golly, here yesterday I -was clea1tiug and checkilIg a set of plugs that 1 didn't think had any where 1Iear etlOugh miles on 'em. After sandblasting, they were cutting 01lt at about 80 pounds Oil the tester. So, just for kicks and to save the cost' of a new set of plugs, 1 tried your tr# k. H

I

,You were

rig~t-there, 1.lJiU#Jt

one that didn't go over 100

~undsJ and miJst

f_ of 1em Wettt to 120. What's more, the engine isn't dogging any more. _ _ __ SFCD.]. C. Dear Sg' D. J. c., Tell you what, you try a couple more of those Ii' l tricks you find in PS. You' ll find lots of 'em work p retty good. You see, the next grease on Connie's and my hands woo', be 'he /irst grease on 'em by many, many years.

lIa1f.:1I/tI4t

. CLEANING DAY BLUES

.

Dc;'r Half·Mast, . Things have ,been happening to the painted surfaces 0/ our artillery pieces. After we use paint thinner to get rid of the grime, the paint becomes ,Jis~ c~reJ. and looks like it's tracking. Are' we using'the right cleaner? LtV. A. Dear Lt V. A., There's nothing wrong with using paint thinner as long as you space the cleanings about a week apart. I've got a hunch your trouble may be w ith the paint itself. It may not be in good shape to begin with. 30

Try Detergent, painted surface, powdered (P·C-431 , type 1) 5-lh cote, FSN 7930-249-8036. Use a cloth, sponge or brush to apply the stuff. The can 'JI tell you how much water yo~ should use. lf you still get a discoloration, you can make a coupla moves. If it's a new weapon, file a UER repo", Otherwise, a new paint job is in or

Hat! _ff/f14t

TANK TIMING LlGk T Dear Half-Mast,

We have

QIJr

new timi"g tight, FSN 6625-J78·2073 (Ord Stock No. 17-L-

12936.3(0), a~ut it works fine o1/.wheeled -vehicles. But we cau't time the AV-1790 e1zgillcs in our tanks. Is there anyway we can get back one 0/ the old-fasbi(med m agneto· timill-g lights, No .

You're r ig ht. The power, blue white light, comb 6, 12, and 24-volt, Oed Stock No. 17-L-12936-300 is not m ~ant to time twin ignitions. T he old Light, timing, magneto, Ord Stock No. 4 1-L-1 439 is going back into the tool set, Organizationa l Maintenance, No. I a nd No.2 Common . T hat, as you k now, is the light to use 00 your tanks ... so requisition yours pron to. 31

lIo1!-Jl/f14t

UNDER CONTROL Dear Half-Mast, Jt7e are changing our main engine generators from 1 ,0 amps to JOO amps on 'rfJur i\f48 ta'Jlks., ,What control box do we use for these?

Dear Mr:-R'If.: The only generator control box which will handle the 300-ampere generator in your M48 tanks is the General Electric or Electro-mechanical box, Oed Stock No. G260-7355925. This box is listed in Ord 7 SNL G254 on page 44.

CONTROL BOX ASSEMBLY ORDNANCIO NO

GENERATOR REGULATOR

D73B925

npE~24VOLTS

SER N 0 I i l B M O D H "

ORO NO 7355915

STYl",.

VOlT DC 2428 MfR S NO 460~1

GEN ERAL 'Ij;) ElE CTRI C NP ]lU.'

RATING SER

I~CA

c:::J

ELECTRO MECHANICAL PROD

MADE IN USA

GARDU CITY MICHIGAN

Since this box is listed for issue only after the Eclipse-Pioneer box. G251-7528304 and the Delco-Remy box, G251-7968600 are exhausted, it will be necessary for you (0 contan your Ordnance support and tell them chat you need GE boxes to work with 3OO-ampere generators. There are imernal differences in the boxes which will not allow the Eclipse and Delco models to handle the larger oUCput generators. The General Electric box uses a different method of currem limiting, and will work with the 300ampere job just as well as it does wich the I 50-ampere model. No change in the box is necessary. Any of these boxes will theoretically control either the I 50-ampere generator or the 300-ampere generator to a limit of 150 amperes. This is supposed to be sufficient power output for the M48 tank's electrica l requirements, so it was planned to use up the existing stocks of control boxes, G251 -7528304 and G2517968600 as they were required. However, field experience has shown that in tanks equipped with the 300ampere generators, sudden surges of the electrical loads can cause failure of the earlier boxes. Consequently, if you have a tank equipped with a 300-ampere generator which requires a control box replacement, and it has eicher the G25132

7528304 or the G251·7968600 control box, you should have the G260·7355925 (FSN 5940-735-5925) box to control it. Explain this to your Ordnance support unit, and they'll get you the proper box. If youe tank engine is still equipped with the ISO-ampere generator, anyone of the three boxes listed above will conrrol it OK. Some later-production tanks are equipped with the newest control box, FSN 2920-335-4264. This box will control either the ISO-ampere generator or the 300-ampere generator just fine. Since the newest box is not interchangeable on the mounts with the earlier

boxes, he sure that you get a similar box

if you need a rePlace'HJ!_Jf!oJ/;

LEAK PROOF Den Half-MAst) ~ Oil Juking up around the transmission sbi# lever Off. our M38 i'I'IUl M38Al fii JU/>s bas bswme • #W~. Most 01 0#11" M. iust oo,;"g wilh IhI sl,.O. W Iut etm ..,. d-o 10 sIof1 this! WQU , Dear Mr. R. P., Fiest off, make suce you never overfill that transmission. It should be

'-8/>'

clear and, not clogged. Be a good idea to , out once in a while, just to nothing in there

stuffing build·up.

Finally, after you've done all this and lube is still showing up, you'd be

helping yourself and a lot of other people if you got those VER's (DA Form 468) off. Just joe down the trouble and your ideas about it, and send it along to the Chief of Ordnance, Department of the Army, Washington 25, D. C, AnN: ORDFM.

sion veO( lines, and make sure they're 33

of "gaposis." The gap is between the base of the projectile and the rammer throwing arm. It happens when the projectile stop doesn't let the ammo

l ~t=::::::;;;;;;;;;;;;='"7"-_ r~~!!!!!!~

go enougharm backpad. to lean against the far throwing \Vhen things are in this shape and you release the rammer mechanism, the ammo bounces forward -away from the pad. And, when ' - - - - - - - - - - - - - --' the pad hits the projectile again, the ammo doesn't seat right. Ordnance is burningthemidnight oil as it looks for a fix. Meanwhile, you beSt check to see if you have an extra gap. If so ... each time you fire, push down on the projectile stop so's the ammo will rest against the pad like it's supposed to. Use dummy ammo in your checking. Also ... never release the rammer mechanism without using either live or dummy ammo. Otherwise, you're liable to throw the rammer works outa kilter. 34

you wanna trot over to the exposed part of the tube. You' ll have some cleaning to do. Before t he piece gets shipped to you, Ordnance coats the tube with rust preventive compound . T he compound-Cosmoline-gj::ts wiped off wit h a rag that has been dipped in dry cleaning so lvent or volatile mineral spirits. Then once a week you smear a light coat of GAA on the tube. In case you find there's paint or primer under the compound, tell Ordnance about it. They' ll get it off and make sure no paint particles foul up the wiper and bearing surface of the recoil mechanism. So give Ordnance the word if you fi nd paint or primer /

You may claim there are to do things-but there are only twO ways to operate the rammer-lever on the M44 ISS-mm self-propelled howitzer. It's ei ther right-hand~d or left-handed-and it depends on you. Operate the rammer-lever accordi ng to the arm you use to toss horseshoes and you won't wind up with your wing in a sling.

Soy you're

If you're right-handed, stand on the right side of the pie