M151 Spotting Scope Upgrade

If your unit uses the M151 spotting scope, NSN 6650-01-504-8456, NSN 6650-01-557-7444 or NSN 6650-01-549-5838, good news! The scope is being upgraded to improve its performance when used with a night vision device. The upgrade includes a grid-based reticle and night vision adapter.

The upgrade will be done by MWO 9-6650-238-50-1. The old spotting scopes will be swapped out at Camp Robinson, Eglin Air Force Base, Ft Benning, Ft Bliss, Ft Bragg, Ft Campbell, Ft Carson, Ft Drum, Ft Hood, Ft Lewis, Ft Polk and Ft Stewart. The swaps will be scheduled through FORSCOM in accordance with AR 750-10. TACOM is managing the MWO.

If your unit isn’t located at one of these posts, the swap will be handled by mail. Contact your local MWO coordinator for instructions. It will take roughly a month for the mail-in swap.

Whether your M151 is being swapped out locally or mailed in, it should be stripped down and contain no down parts. Any parts turned in other than the scope won’t be returned and it will be the unit’s responsibility to replace them.

Questions? Contact Buck Sewell at (586) 282-1333 or email:


or Christopher Kline at (586) 282-1357 or email:



Repair, Don’t Replace, Precleaner

Item 1 of Fig 22 in TM 5-3805-298-24P (Mar 13) lists the 924H wheel loader’s precleaner, NSN 2940-01-068-7108. Replacing it will cost you a bit more than $107.

But what if it’s the cover or body that’s broken? Seems a shame to pay that much when only part of the precleaner is damaged.

Good news! Now you can replace those precleaner parts:

Item NSN Cost
Access cover 5340-00-103-8902 $17.56
Precleaner body 2940-00-876-2181 $19.65



Repairing the precleaner will save you a lot of bucks over the cost of a new precleaner. Make a note until the parts are added to the TM.

Rubber Boot Cracks Don’t Deadline

ms-7488-m-fig-1Some units are deadlining the M1235A4/A5 MaxxPro Dash ISS MRAP during checks and services. Why? Because they see cracks in the rubber boot cover on the steering gear output shaft that connects to the pitman arm.

Step 3 of Items 15 and 106 in the PMCS tables of TM 9-2355-441-10 says to check the pitman arms for cracks and bends. If the pitman arm is cracked or bent, the vehicle is deadlined.

But this is a case of mistaken identity! This particular check is referring to the pitman arm itself, not the output shaft’s rubber boot.

Cracks or tears in the output shaft boot do not deadline your vehicle. Cracks there have no bearing on the form, fit or function of the pitman arm. The pitman arm has an internal seal to protect it.

For more info, check out TACOM Maintenance Information message 16-046:


Stamp Out Broken Clamps

Operators, get down on your hands and knees and check out the rear leaf spring, NSN 5360-01-375-7092, on your M1088A0/A1/A1R/A1P and M1157A1P2 FMTVs and M142 HIMARS.

The spring has a series of retaining clamps on each end: a short clamp on the bottom, an intermediate clamp that bands the #1 through #4 leaves, and a long clamp that binds everything together. The intermediate clamp on some vehicles is breaking from wear-and-tear and vehicle vibration.


While a broken clamp doesn’t make your vehicle NMC, you should still get your mechanic to remove it like this:

  1. Remove the long bolt and nut at the bottom.
  2. Pull out and discard the intermediate clamp.
  3. Insert two grade 8 bolts, NSN 5306-01-253-4429, through each side of the remaining two clamps. Secure them with two self-locking nuts, NSN 5310-01-241-6659.


By the way, if you order a new replacement spring with NSN 5360-01-375-7092, it will already be upgraded to the configuration without the intermediate clamp.

M2A1 Barrel Questions Got You Over a Barrel?

The bracket for Item 11 in WP 0038 00-2 of the M2A1 machine gun’s TM 9-1005-347-23&P shows the barrel assembly, NSN 1005-01-541-2478, to include the barrel, flash suppressor, barrel cap and carrying handle. But when you order that NSN, you receive only the barrel with the flash suppressor installed.
The bracket for Item 11 in WP 0038 00-2 does confuse things and will be removed in the next revision to the TM.
When you order NSN 1005-01-541-2478, you’ll receive only the barrel and the installed flash suppressor.
The barrel carrying handle (Item 12), NSN 1005-01-539-3410, is BII and should not be turned in with a damaged barrel.
The barrel cap (Item 14A), NSN 5340-01-545-2949, is BII for the BFA, which is covered by TM 9-1005-314-13&P. It also should be kept and not turned in with a damaged barrel.
The barrel cap can be used in place of the flash suppressor during live fire training. When the BFA is going to be used, the barrel cap should be installed like it says in the BFA TM. Remember there is also a barrel protective cap, NSN 5340-01-552-0082, which protects the barrel breech threads. Don’t mix up the caps.

Locking Block Can Ruin Your Piece of the PIED

The KGV-72 programmable in-line encryption device (PIED), NSN 5810-01-564-3364 (LIN E05008), is designed to encrypt Blue Force Tracking (BFT) message traffic.  But when it’s time to turn in the PIED, here’s a message that really needs to get through:

Don’t damage the locking block!

Too many units are losing or misplacing the padlock key.  So when it’s time to turn in the PIED, they use tools to remove the lock.  Unfortunately, that almost always breaks the locking block.

A broken block can’t be repaired.  Even worse, you can be held financially liable for replacing the $2,565.58 PIED per AR 735-5, Property Accountability Procedures and Financial Liability Officer’s Guide.  A DD Form 200, Financial Liability Investigation of Property Loss (FLIPL), along with a property book officer document number must be submitted at the time of the request to the item manager before an operational PIED can be issued.

So don’t lose the key to your lock.  And if you do, check with the item manager for instructions on what to do next.


Watch Out for Bulging Tubes

Watch Out for Bulging Tubes

Crewmen, it’s bad enough when explosive ordnance disposal (EOD) has to remove a stuck round from your 155mm howitzer. It’s a lot worse if you’re left with a bulging cannon tube!
That’s what could happen to your howitzer if EOD uses the water blast method to remove a stuck round.   The 155mm cannon tubes most at risk are the M7776 and M284 steel and M7776 and M284A2 chrome barrels.

If EOD uses the water blast method to extract a stuck round from your howitzer, inspect the cannon tube with a borescope. A bulge means the tube has to be condemned. If you suspect a bulge but can’t see one, use a pullover gage to measure the area where you suspect damage.
You’ll find the full scoop on inspecting for damage in TM 9-1000-202-14, Evaluation of Cannon Tubes. Appendix T covers the M7776 tube and Appendix U covers the M284 tube. EM 0065, which covers most small arms, has the TM, as does LOGSA’s ETM website:

Be sure to immediately notify your logistics assistance representative (LAR) or field service representative (FSR) if EOD removes a stuck round from your howitzer.
You are also required to report EOD round removal and any damage on DA Form 2408-4, Weapons Record Data Card, in the remarks column. You can access it at: