PS Magazine Issue 174 1967 Series [174 ed.]

Citation preview

WHERE aMAL CONOITIONS ARE ••• PREVENTIVE MAINTENANCE MUST KEEP PACE. So, the USUAL routine chores must become an UNUSUAL program of care and constant check· ing. USUAL things like lubes, seals , pai nt, coolant, cleanliness, tight connections and caref ul hand li ng become the UNUSUAL! So . . .

GIVE YOUR E UI

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WE ST MO RE GE N. " ' . C. Ge ner al Co mm and ing 1tan(~e

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our fig hti ng m en are ity, fire power and s wh y bat tleSup eri or mo bil ey are the reason Th m. tna Vie se ass ets are gre ate st ass ets in e gre ate st of the a cer tain ly. Th mo bili ty are and fiel d vic tor y is er pow rse ; but the fire den ly and the me n, of cou r adv ant age sud we can los e ou ke pt in top -no tch ess ent ial, and not is ent ipm hti ng equ fin ally if ou r fig e har dcon dit ion . n and dep end abl n qui ck rea ctio mo unt ain Liv es dep end upo tro pic al jun gle , dy, pad rice the e enc oun · wa re, wh eth er ill m. W e n ever hav are as of Vie tna where. Th e any s or coa sta l pla in ion dit con fic ult com bat bin atio n ter ed mo re dif the abr asi ve com t on sea son s and pro bab ility tha alte rna tin g mo nso the to add d rai n and mu mo me nt in bat tle of hea t, dus t, ng wro the ely fail at pre cis - {ro m the equ ipm ent wil l ce of equ ipm ent car e of ever y pie unl ess we tak e . nch wre que le car e. UH -ID to the tor the fin est pos sib mu st be giv en an ed, lub ric ate d Ou r equ ipm ent ly. It mu st be cle per pro ed rat mp tly and It mu st b e ope be r epa ire d pro ula rly. It mu st and adj ust ed reg pre ven corr ect ly. mb at h~ s good the his tor y of co en­ Ne ver bef ore in absol~tely es~ so ntrta po im bee n so , tive ma int ena nce ir alli es. , the and n me . fi ght ing tia l-t o the U.S

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lST .UO RIl GIl N. W. C. WIner al t::: om ma ndi ng 1J. S. Mi lita ry

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our fig hti ng me n are ty, fire pow er and Sup eri or mo bili son s wh y bat tlerea the are ey in Vie tna m. Th se ass ets are gre ate st ass ets e gre ate st of the are a cer tain ty. Th fiel d vic tor y is er and mo bili ty pow fire the but rse ; ly and the me n, of cou adv ant age sud den our e los can we top .no tch ess ent ial, and is not kep t in hti ng equ ipm ent fin ally if our fig e har dcon dit ion . n and dep end abl n qui ck rea ctio gle, mo unt ain Liv es dep end upo jun al pic tro the ric e pad dy, e enc oun wa re, wh eth er in m. We nev er hav are as of Vie tna . Th e or coa sta l pla in ion s any wh ere dit con bat fic ult com atio n ter ed mo re dif abr asi ve com bin the and s son nso on sea y tha t alte rna tin g mo to the pro bab ilit add d mu and rai n nt in bat tle of h eat , dus t, the wro ng mo me fail at pre cis ely ipm ent - fro m the equ ipm ent wil l ry pie ce of equ eve of e car e unl ess we tak que wre nch . le car e. VB ·ID to the tor the fin est pos sib mu st be giv en d Ou r equ ipm ent cle ane d, lub ric ate be st mu It ly. ed pro per and It mu st be ope rat air ed pro mp tly rep be st mu It ula rly . and adj ust ed reg ven cor rec tly. bat h~s goo d pre the his tor y of com ol~tely es~en· Ne ver bef ore in po rta nt- so abs im so n bee , , tive ma int ena nce and the ir alli es. . fig hti ng me n tia l-t o the U.S

e of Co nni e and I ha a ve made. this issu of PS Ma gaz ine all bou t ma mte nan ce Arm y eq . like ons diti con und er nt v~e ~Ip find you letn am . 10 . rv" If you 're "in-cOunt- J now , We hope this . . ere it helps. wh y~U hus ~ If 1SSU tn you re not 10 Vie am, bet ter rea d it anyway.

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Pubilihed by the Department of the Army

IS AMUST!!

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IN THIS ISS UI FIREPOWER

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FIELD-GROWN ADVICE ON YOUR Ml02 HOWITZER Your MI02 l05·MM lightweight towed howitz. er's sure throwing heavyweight punches where they count. But, here're some gentle reminders to avoid certain PM goofs that've been known to cramp its fighting style at times. You Chiefs of Smoke could do worse than to get every guy in your crew (0 look 'em over careful-like and then take the pledge. Like:

FIELD-GROWN ADVICE ON YOUR M102 HOWITZER Youe MI02 l05-MM lightweight rowed howitzer's sure throwing heavyweight punches where they count. But, here're some gentle reminders to avoid certain PM goofs that've been known to cramp its fi ghting style at times. You Chiefs of Smoke could do worse than to get every guy in your crew to look 'em ovec careful-like and then take the pledge. Like:

take the covers off every day at least ... dry the covers . .. wipe all the scopes and mounts real dry ... give a sharp look that no moisture's leaking into the counters and windows . .. and then replace the covers.

Not a single one of these places needs lubing-and you'd better not forget it! In fact. if you put oil or grease on 'em, it' ll mess up the dry fi lm lubricant and this'll collect dust and grit that'll chew ou[ the parts. JUSt keep all these parts real dean with Cleaning Compound (FSN 7930395-9542 ... I pt). Be positive you never clean 'em with anything that contains an oil base.

FIRE CONTROL EQUIPMENT Condensation Control-Never make the mistake of believing that your scopes and quadrant are protected when you put the covers on 'em. Suce, these plastic-type covers do a good job of keeping cain, fog, dust and the like off these delicate pieces ... but they a lso create one heckuva problem with condensation. A lot of section chiefs find this a good way CO fight it: Detail a good man to

KEEP COVERS ON BUT CHECK OAIIY FOR CONOENSATION 3

take the covers off every day at least ... dry the covers ... wipe all the scopes and mounts real dry ... give a sharp look that no moisture's leaking into the counters and windows ... and then replace the covers.

it! In fact, if you put oil or grease on 'em, it'll mess up the dry film lubricant and this'll collect dust and grit that'll chew out the parts. Just keep all these parts real clean with Cleaning Compound (FSN 7930395-9542 ... 1 pt). Be positive you never clean' em with anything that contains an oil base.

FIRE CONTROL EQUIPMENT Condensation Control-Never make the mistake of believing that your scopes and q uadrant are protected when you put the covers on 'em. Sure, these plastic-type covers do a good job of keeping rain, fog, dust and the like off these delicate pieces . . . but they also create one heckuva problem with condensation. A lot of section chiefs find this a good way to fight it: Detail a good man to

KEEP (oVERS ON BUT CHECK OAILY FOR CONOENSATION

3

Pan-Tel Counters Won' t Count? Maybe you're crying to drive in high gear when all you've got is low . Your TM says don't turn the Pan.TeI counter crank faster than 150 turns per minute for a very short time or more

So, slow down, Gunner! The sight you save might be your own. Each turn of the handle moves the sight head and counters 100 mils, right ? OK, so here're the safe speed limits for you: For that short run - say. up eo 1600 mils-count 3 seconds for each 2 turns or count 10 for the 1600 mils; For the long run - say. 3200 mils and up - count a full second for each turn of the handle. Instrument Lights Case - Don't forget the dummy receptacle gets screwed ineo the container. Never just reach in and grab the battery case and pull away. You' ll damage the cable and

wire connection. Before you remove the case, unscrew the cable end out of the

corrector on the weapon-always. Never take it off for cleaning or anything else. You JUSt might lose the shims and then you'll have trouble. If you disturb or loosen the cant correceor, you' ll put it out of alinement with the trunnion - and then you won't get a correct reading with a gunner's quadrant. If this happens, your weapon would have to go to Depot for rea linemene.

COlliMATOR You guys with the MI02 arc about the first in history to get this fire control aid. Herc're some tips for getting the most out of it: Remember, the cover's got to be open for operation. If you close the lid with the cable installed, you'll slice the cable in cwo. Always set up the collimacor to the lefe and a little to the rear of the howitzer like the TM shows.

Put a "fence" (rope, rape or something) around the collimator to protect it from big feet - especially after dark. Make sure every guy in the outfit gets this straight: If you accidentally knock the collimator over or budge it at all or trip over a wire, report it pronto. Don't just set it back in place and forget it. Likely you ko_ocked it 100 mils or more off course.

INITIAL AliNEMENT

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. ,.

• •

lEIT DISPLACEMENT

You, Gunner-when you'recorcccting for displacement and the "0" vertical line of the collimator is not visible, make real sure you place the Pan.Tel sight number on the correct side of the "0" line. F'rinstance. if the collimator num· bers are increasing up and to the left, select a number 00 the Pan·TeI which is to the left of the Pao·Tel vertical line. Then superimpose it over a correspond. ing number on the collimator.

Watch out you don't over-tighten the leveling or elevating damping knobs on the collimator or the three leg damps. They should be just snug enough to hold, but too much pressure will damage the threads. Incidentally, all of these have 2 holes, but one has a visible screw head.

Heads up, Hey! Never loosen the screw. It acts like a StOP for the fnction damp-to keep the legs and other parts from moving. Mess with this screw and your collimator's in for a trip to Depot for readjustment.

When you' re emplacing your weapon, be sure you drive in a ll 8 stakes, not just some of 'em. When you're firing, try to maintain the full depth of the stakes. This means you may have to doublecheck 'em every so often. Sometimes frequent repositioning is needed in soft soil. And when you're ready to pull up stakes to move on, be su.re to remember these couple things: 6

1. _tryto.-..thestakes IIyjacking .. the pIarform. Malee .... the ..... are pundIed do.. and loose beIere you raise the platform. " !his won', work, ,..,... the pIatfonn and ..... ,•• up the ....... Para 22 of yoor -12 111 has ..... good s