G

Hits original get a new

hand brake valve.

You may have a bad hand brake valve if your truck's got the valve that came with it.

A disk at the base of that old valve may be cracked. That lets air seep into the trailer service brake system.

Air in the system slowly puts on the brakes and locks 'em -without warning - while you're towing the EL. You can drag the EL into a fire before you know it.

If you think the truck may have an old valve, replace it . New valves with the cracks worked out of 'em are in the supply sus-tem.

3

Brake lines

CALL THEM Al/Cc THINGS/ MANI 'CAUSE WENEEP'EM/

You get a fire for sure if you tow the EL with the air supply and hand brake control lines crossed in the XM757.

That is , you set the EL ablaze if you manage to get it out of the parking lot. Trailer service brakes lock immediately when the 2 lines in the truck are crossed.

If that's the case, your shop just may have crossed the 2 lines -without knowing it - while following the info in TM 9-2320-230-20 (Apr 69) to put in a new tractor-tra il er protection valve.

The brake line hookup at the protection valve is wrong in both Fig. 2-231 and Fig. 2-340 of the TM. The right hookup is in TB 43-0001-39-3 (Oct 77). The TB also tells your shop how to dou-blecheck the hookup without the EL.

r Throw away that grease you've

been using on cold days to keep the skin of your Pershing missile from sticking to the EL-Erector-Launcher - boom.

That's righ t, there's a better lube. It's called flourosilicone oi l, NSN 9150-01-042-4902.

That oil works every day, whether cold or very hot - when the grease can turn to g lue. That leads you straight to a NO-GO, with the missile skin stuck to the EL boom.

Th get rid of your st icky prob-lem, pour some fluorosilicone oil on a dry, clean cloth and rub it over the rubber cushions in the missile cradle. The word's in Change 4 to TM 9-1425-383-10-1 (Nov 75).

Rub oil, NSN 9150-m-042-4902 over the

,,

Pershing Power Station . . .

Clean Battery Change Be extra careful when you change batteries in the Pershing power sta-

tion. That's because the station uses 2 12-volt batteries - either 2 nickel

cadmium or 2 lcad acid batteries -to power the components that launch the missile.

Never mix one type of battery with the other. The chemicals in those batter ies clash; the lead-acid will destroy the nickel cadmium

WOULt7 YOtJ MIX ONE !7o'G ANP

Or-JE CAT?

V ---~~~--

Never mix nickel cadmium with lead acid

batteries

Either use 2 nickel cadmium batteries-NSN 6140-00-239-4898-or 2 lead-acid batteries-NSN 6 140-00-057-2554.

When you switch from one type co the other, clean the battery area in tha t station thoroughly. Just a trace of lead-acid is bad news.

To gee the battery area sparkling, follow para 4-42a in TM 5-1450-204- J 2 ro the Jerrer.

Otherwise, you may end up with 2 dead batteries, a dead power station and a missile sys tem that won't work.

7

AN/TSQ-110

IMA61NE SOMETHING AS t7ELICATE AS AS A CRYSTAL 61.iTTERFL'//

?Ii, ~ ~-~L______:v.

Picture a delicate, beautiful piece of fine crystal.

You'd be extra careful not to bump, bang or stumble into it. 1b do so would be to smash it.

Much the same goes for the reference assembly in your AN/ TSQ-110 azimuth laying set which you use to aline the Persh-ing missile to its target.

Handle reference assembly with care

A bump or bang probably won't smash your assembly - or even knock it over - but a good punch to the assembly is sure to KO the north seeking gyroscope.

'Course, you can't hurt the gyro too much if you stumble and fall into your reference assembly when the gyro's caged. What you don't want lo do is to bump or bang th e assembl y wh en the gyro's spinning and turning.

BE: CAREFUL AROUND THE REFERENCE

ASSEMBLY/

You can trip over the tripod legs and bump into the

reference assembly.

Withou t t h e gyro, t h e com-puters in the programmer-test station can't get a reading on true north. The reading serves as the fixed point for alining the missile to the target.

To keep the gyro spinning and turning, handle your assembly with kid g loves - and watch your big feet - when the gyro's uncaged. It's easy to trip over a leg on the azimuth ieference unit tripod.

Besides that,just a little rough stuff is sure to crunch the gyro if it's uncaged after shutting down

9

t he assembly. Th e gyro's sup-posed to be caged automatically - but even Artoo-Detoo had bad days.

When packing, handle the as-sembly li ke a newborn baby. Slip it out of the azimuth reference uni t t ripod and put it back into its container just like it says in para 3-10 of TM 9-1430-383-14 (Nov 75).

The word in para 3-10 is meant to safeguard the glass in the AOL - automatic optical link - tele-scope. But it'll also help tame a wild but de! icate gyro.

j

Pershing Actuator Cables ...

LOOK OUT, MYRTLE.: HERE "THEY GO

AGAIN.'

Wanta keep your Pershing missile on target and out of your back yard?

Check the cables. The missile !lies right only

when electrical cables are hooked up right on those 6 hydraulic ac-tuators - 3 each on both the first and second stage.

If support turns just 2 of the ca-bles around , you get inflight course correction trouble with a ,~~-

1\ capital T For instance, a wrong hookup at the No. 2 and 3 actuators in either the

first or second stage makes the missile go left instead ofright - or right instead of left. Here's how:

The computer feeds the right course correction info to the actuators. But the actuators - through the wrong cable hookup - tell the jet and air vanes that steer the missile to go the other way.

'lb keep the missile on course: Check the cable hookup at the 6 actuators during both your in itial and semiannual maintenance checks. The word on that is in Tobie 4-2 and 4-3 - Service Upon Receipt and Semiannual Preventive Maintenance Service - on both the first and second stage in TM 9-1410-380-12 (May 73).

10

,

#2 & #3 Actuators controlling these vanes get cables crossed up

10W2P7 and 10WIP5 cables must go to J2 & JJ jacks on curb-

side actuator #3

Double-check the hookup at the No. 2 and 3 actuators on both the first and second stage.That's where most of the trouble lies. b 'Course, you know support lays those cables- but it's more than easy

1 - to turn the main cable around. That means you get a correct cable

hookup at actuator No. 1 but not at actuators No. 2 and 3. To make sure support's got 'em right, check the hookup for those 2

actuators against Tobie 5-1, Con nections for Hydraulic Actuators, in your -12 TM. Check out the hookup on each of those 3 actuator lines.

lfyou find a mistake, call support to take those cables out and rework 'em before you take that missile to the firing line. Otherwise, you get to tear that missile down-at best - or have it land in your backyard -at worse.

Then, keep an eye peeled for 2 very importa nt additions - a new break-out box and a new cable assembly.

BREAK-OUT BOX: The box - now being fiBl

-f'l "ri - - - .--- "'..'_'Jl ~ -~-- ::::~ ~ oeoooo

....,,. - -

-:;:.,i)~ ! ! ! te ~ .-'!~- g_ = 0 0

-- -"1:.. .--:..----.

-- -""-'r=

NO WATER IN ELECTRICAL CONTROL BOX!!

Each Pershing Stabilized P latform I 20-ST-120-is e lectronica lly m;1tched and mated ro a Servo-Loop Amplificr- SLA.

Each ST- I 20's ID pi3te has its own serial number, and the seria l numbe r of th

I I

1. Before you attempt co life any load 2. Be sure, too, with the davit assembly on the erector extended '--~~~~~~~~~~~~~ launcher (EL), be sure the EL is level.

If the EL is not level and the jacks are not out, the EL can swing on the fron t jack and roll over. In which case, you could be looking up at an OD Tijuana caxi while t he Bears t ry to hau l you out from under.

You can cut yourse lf an l l- in by 2-in stenci l and paint a warni ng on the control panel of the davit assembly . . . as a reminder. The warn ing can read:

WARNING 00 NOT LIFT LOAD WITH DAVIT UNLESS ALL

JACKS ARE EXTENDED AND EL IS LEVEL

THE "WARNING II SHOULD BE A00UT >'2-INCH HIGH. WITH THE REST OF THE: LETTf:RS AOOUT

~INCH HIGH.

14