CANNON TUBES-Lands raised, chipped, corroded.

 The tube on the 175-mm is chrome-plated,
so if you find any flaking, don't worry about
it. However, be sure you keep track of your
tube's EFC (equivalent full charge) entries in
column g of its DA Form 2408-4. Any time
you have a doubt about the serviceability of
the tube, ask your support guys for a bore-
scope and pullover gage reading. The charts
in TB ORD 1054 (6 Dec 63) will come in
handy for figuring EFC's after every firing.


LEVELING PLATES-Chipped, painted, dirty.
 (Like the TM says, protect these plates at all
limes Especially. don't lay tools and other stuff
on em. They've gol to be in A-1 shape for bore-
sighting. (lean these plates after every day's firing
- and don't point 'em.)


BREECH MECHANISM 1 ASSEMBLY (Breech closed)


CAM-Chipped, broken; screws loose, cross-
Ihreaded Check to see it the cam follower
roller isn't bent or frozen


F']


M35 FIRING MECHANISM-Won't work; compression springs weak, won't cock and
fire; hammer guide yoke burred, corroded; hammer sear spring missing, put in
upside down; hammer operating sear installed backwards (see Fig 105 in your
.10 TM); hammer and cap burred, corroded, carboned up.

 FIRING MECHANISM HOUSE
 ING-Housing rusty, dirty,
 corroded; extractors bent,
 damaged, rusty.


FIRING GROUP BLOCK-Won't operate smoothly;
follower roller nicked, burred; follower spring
weak, broken; knob cracked, broken; knob pin
missing, worn; carrier lugs broken, worn so much
that they let the firing mechanism turn; firing :
pin damaged, broken; firing pin retainer missing,
bent. (Never pull the lanyard unless the firing block's in
the dosed or firing position otherwise you'll ruin the
firing pin.)


 LANYARD LEVER AND ROPE-
 Lever bent, broken; lever pin
 worn-won't hold in groove;
 lanyard rope frayed, cut; S.
 hook bent, deformed; knob
 (plastic or wood) missing,
 broken-wooden knob should
 not be painted.

 39

 AFE>


175 MM


- WATCH 11
 if TrHT REC


TRAVEL LOCK-Out of adjustment; handles or latches busted or damaged.






 (If it needs adjusting, get the dope out of Fig 160 in your -20 TM You wont to check the
 travel lock in both the travel and fire positions. And doublecheck the shaft on the T.handle
 it bends real easy. When you engage or disengage the travel lock, remember, the weapon
 must be in battery and the tube should be elevated- using Ihe handcronk Don I use power
 And remember this- lo prevent injury to the weapon, make suie it is in travel lock position
 any lime the vehicle's being moved and that it stays in travel lock tIll you re about set
 to file.)


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