PS Magazine - SEPTEMBER 1985
PS, The Preventative Maintenance Monthly
ISSUE 394
SEPTEMBER 1985
M1 Tanks .±
Line-of-Sight
EU
Damage
Water can get inside the line-of-sight eLectronics unit on your
ml
tank and
cause erratic operaTion or a runaway turreT.
Water gets inside when the Font connecTor paneL of The
EU
is pUlled loose
Fom the housing. Vibr±ation during operation or prying The unit ouT
of its rack can let the water in. Water
Short circuits elecTronics and causes a
loss of conTrol.
²here'S soMe improveMent on the
way ³r new units, but the one in your
tank needs your help. Eyeball the Font
panel ³r separation Fom the housing.
If there'S any separaTion, remove the
unit and send it to D´ ³r repair.
Once
you
get anoTher unit,
take
care noT to separate the paneL FoM Thµ
housing when you insTalL or remove it.
Changes to ²¶ 9·2350-255-20-2-3-3
wiLl require tHe other electronics uniTs
in the rack to be removed be³re The line-of-sight unit.
Check
around
edges
foR
separation
Also, two mechs wiLl handle the work, one mostly to lift the rack so removal
and
¸
instaLlation will be easier.
LeF ±irst is Right!
/
It'S left, then right, when you open
The modi¹ied gunner'S primary sight
ballistic doors on your
ml
tank.
²he modiºcaTion is a piece of meTal
»elded on the left-hand (day) door. IT
overLaps the right¼hand (thermal) door
,±J
and takes The place of a rUbber sTrip.
µ
f.:=²³ ´¶·
A½WAY´ open the le¾¿hand door
ºrst and close it last. If you try to musÀ
cle open the right-hand door ºRsT, you'll
bend and posSibLy break the linkage.
4
SeP 85
r
²
³´.
,
µ¶·¸¹
ºI
- ²
³
-
'´=µ:¶
·
¸
±=²
.
³´µ
´hake, ratTle and roll is Taking a ToÁÂ on the Screws on The
ml
tank's scavenger
Ãn driveshaÄ.
Vibration is caUsing loose screws. ²his could lead to Ãn ÃilUre and possible
engine per³rmance Loss becaUse of a clogged precleaner or VÅpacks.
²he solution is longer screws and locknUTsÆbeing distribuTed aS a KiT bÇ
maTeriel ºelding teams.
²he kÈts wiLl get to yoU sooner or later, bUT if your tanK iS out now because
of Ãn Ãilure, here's what you need:
¸
N´N 5305É00-978-9383 gets the new screw ³r the Ãn end of the
driveshaft. You need two of These 1 3/4-in screwS.
¹
N´N 5305-00·978-9382 gets The 1 1/2-in screw ³r the oTher end oÊ
the shafT. You need two of theSe also.
NSN
5305-00±978-9382
:±=²³
For thE 1 ²/2-iN
s³rEws
NSN
5305±00-978-9383
foR the 1 3´4-in
screws
NSN
5310-00±061±4650
For the lockNuts
º
N´N 53Ë0-0Ì-061-4650
gets the locKnuT that ºts all ³ur screws.
Install the screws and TorqUe to 95·105 lb-in. ²hen install The lockÍuts and
toÎque Them to 72 lb-in.
If you don't have a Ãilure between now and the next scheduled annual serÏ
vice, leave well enoUgh alone. At the annual, just check The driveShaÄ ³r locÐnuts.
No lockÍuTs? Change to The new parTs.
SeP 85
5
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