M1-Series Tank . . . If Light Goes On, Engine Goes Off

     Drivers, the tank’s ENGINE OIL CLOGGED FILTER warning light is very similar to the check engine light in your POV.

    So just like with your car, if you see the light go on, don’t hesitate.  Shut down now.  Otherwise, the dirt, sand and other gunk that’s in the oil could shut down your tank’s engine–permanently.

    Dirty oil bypasses a clogged filter, carrying dirt into the engine.  The bypass feature is to keep the engine running when you’re on the battlefield.

    But that dirty oil gets into engine parts.  The longer you run with a clogged filter, the more damage grit and dirt cause.

    Mechanics, if the light stays on after changing the filter element, the problem is probably a bad by-pass pressure switch on the engine oil pump assembly.  Replace the switch with NSN 5930-01-089-9142.


M2/M3-Series Bradleys . . .Is the Curtain Closed?

     Crewman, a missing or open dust curtain, NSN 1005-01-126-7797, on your Bradley’s TOW launcher can lead to unnecessary damage.  That’s a real show-stopper!

    Without the curtain’s protection, dirt and moisture get inside the launcher.  That allows corrosion to build up on the armament control unit’s (ACU) umbilical connectors.  Corrosion can also allow the missile latch/release handle to seize up.  That makes it hard to load, seat and lock the missiles into the tubes.  So keep the curtain closed whenever the launcher isn’t being used.

    ‘Course, you can’t close the curtain if the snap fastener studs and hook-and-pile tape are missing or damaged.  Replace the studs on the launch cover with NSN 5315-00-174-2882.

    New hook-and-pile tape for the top cover comes with NSN 8315-01-470-8453.  That brings a 25-yard roll of 1-in wide black tape.

Winter Driving Safety Tips

Winter is the toughest driving season, especially in areas that get a lot of snow. But even in southern locations, where winters are milder, unexpected snow and ice can cause dangerous roads.

    No matter where you live or work, it’s wise to prepare for any conditions you may encounter on the road. Here are some tips for taking on tough weather:

  • ·   Make sure your vehicle is in tiptop shape by doing all PMCS.
  • ·  Check road conditions and weather reports before heading out. Even when it’s not snowing, roads can ice up where there’s moisture. Sometimes a spot looks wet, but it’s really black ice.
  • ·  Vehicles can’t stop as fast on ice or snow-covered pavement. Keep a greater distance than usual between your vehicle and others.
  • ·  Slow down when following others, especially during turns.
  • ·  When making turns, ease up on the gas pedal slowly and move the steering wheel gradually. Avoid fast, jerky movements.
  • ·  Be deliberate with any driving actions. When pressing gas or brake pedals, do so slowly but steadily.
  • ·  Approach intersections cautiously to reduce the risk of a skid.
  • ·  Keep an eye on your rear view mirror for other vehicles that could hit you from behind.
  • ·  If your vehicle starts sliding, don’t panic. Ease your foot off the gas pedal. Don’t press the brakes, but steer the vehicle into the skid. For example, if you’re driving straight ahead and the rear of your vehicle starts sliding left and the front to the right, counter by steering the vehicle to the left. If the vehicle corrects itself, straighten the wheel. Sometimes a vehicle overcorrects and slides the other way. If this happens, counter-steer again in the opposite direction.
  • ·  When visibility is reduced by fog, use low headlights and/or fog lights.
  • ·  Turn high beams off if they are not needed. They can distract and blind other drivers.
  • ·  Keep the windshield clear of snow, and check from time to time that snow has not built up on the headlights.
  • ·  Avoid crossing traffic if possible.
  • ·  Keep daytime running lights on at all times on public roadways.
  • ·  Allow extra time for your mission. Remember, there are fewer daylight hours in winter months.
  • ·  Slow down! 
  • ·  For more driving and safety tips, see FM 5-19, Composite Risk Management (Aug 06), or check out the USACRC Driver’s Training Toolbox at:




Tips for Towing the Mark


Even well-maintained tactical vehicles can unexpectedly break down. That’s why it’s smart to plan for the worst-case scenario and know the right way to tow. Here are some towing pointers:

  •   A tow bar should be the first choice before using chains, ropes or cables.

  When using a tow bar, also connect a safety chain between the two vehicles in case the tow bar breaks or disconnects. Use a chain with an appropriate load rating.

 If a tow bar is unavailable, connect cables, chains or ropes to the pintle of the prime mover and to the lifting shackles of the towed vehicle.

 Do not put hands near the pintle hook when aligning it with the lunette eye hook.

 If you must tow in heavy traffic, tie the front lifting shackles of the towed vehicle tightly to the rear lifting shackles of the prime mover and connect the air brake lines.

 Use a ground guide when moving a disabled vehicle. The ground guide must remain visible to the driver at all times. See Chapter 11-4, Section (9)h in AR 385-10, The Army Safety Program (Oct 11), for more ground guide rules and tips.

 Never allow anyone to stand between the two vehicles when the prime mover is backing up to the disabled vehicle.

Never allow anyone but the driver to ride in the disabled vehicle being towed.

Prior to towing, make sure all personnel are clear of vehicles before removing wheel chocks.

Use reasonable speed for road conditions. The maximum speed limit when towing off road is 15 mph. On paved roads (highways), speed can be increased to 25 mph. However, terrain, weather and other conditions may require keeping speed lower.

Avoid making sharp turns when towing. Keep turning speed at 5 to 10 mph to reduce skidding risk.

Avoid hills with greater than a 20 percent incline. The weight of a disabled vehicle can push or pull the tow vehicle, causing loss of control.

Before disconnecting the vehicles, make sure both vehicles are on level surfaces with wheels chocked.

Know Before You Tow

Review towing procedures in vehicle TMs and FM 4-30.31, Recovery and Battle Damage Assessment and Repair (Sept 06).

Recovery operations are a specific skill set. A trained vehicle recovery specialist (additional skill identifier H8) should be part of the recovery team whenever possible.

 Warning: If a disabled vehicle’s brakes are not working, do not try to flat tow it. Call for dedicated wrecker support.

One for the Road

Remember, failure to assess towing risks and use due caution before and during recovery operations can cause equipment damage. But worse, it might result in injury or death.  

For more safety pointers, check out the USARC/Safety Center’s Driver’s Training Toolbox at:


H-60/H-47 Series…What Do You Do With the MCU?

     Mechanics, are you scratching your head trying to figure out why you’ve been losing refrigerant in your microclimate cooling unit, NSN 1680–01-508-6625?

    The likely answer to that question is improper storage.  

    Never store MCUs below freezing for prolonged periods. If you do, the O-rings will shrink and allow refrigerant to leak out.

    Store the MCU at temperatures above freezing to prevent loss of refrigerant. Store it in the same packaging it came in. That’s the reusable fast pack MIL-SPEC box. It’s the only authorized packaging able to withstand shipping vibrations and drop shocks.

    The good word about proper storage can be found in aviation maintenance information message (AMAM) H-47-MIM-006/H-60-MIM-001, Storage of Microclimate Cooling Unit (MCU) (Jun 11).

     Now that the storage issue is solved, what about broken MCUs? Turn in  a broken MCU and order a replacement through normal supply channels.

Ammo codes

 Ammunition supply points (ASPs) have millions of ammo rounds in varying condition codes (CCs).  The codes are used to efficiently manage all these rounds. 

    Unfortunately, most units are only familiar with code CC-A: “serviceable and issuable to all customers without limitation or restriction.”  And that’s all they ever ask for from their ASP. 

    That needlessly uses up CC-A ammo that is best saved for units deploying. CC-B ammo, for example, is “new, used, repaired, or reconditioned materiel that is serviceable and issuable for its intended purpose; however it is restricted from issue to specific units, activities, or geographical area by reason of its limited usefulness.”

     A good example of CC-B ammo is linked machine gun tracer ammo whose tracers sometimes burn out before they reach their required distance.  This ammo isn’t good for combat, but it is  excellent for training. 

    CC-C ammo is “serviceable (priority of issue) items that are issuable to selected customers, but which must be issued before conditions ‘A’ and ‘B’ materiel to avoid loss as usable assets.” 

    Many CC-C types of ammo are lots in small quantities, lots with short shelf life or lots in cans that have already been partly fired.  The 120mm M831 target practice round, for example,   has an 18-year shelf life, but is reclassified as CC-C after 13 years. 

    Units can save the Army big bucks and help their ASPs by asking for CC-B and CC-C ammo for training.  Just one M831 target practice cartridge for the M1-series tank costs $1,355.  So using a CC-B or CC-C M831 not only saves the cost of buying a new round, but frees up valuable storage space in ammo bunkers.  Multiply that by the thousands of rounds units fire each year during training. 

    The Joint Munitions Command (JMC) teams of ammunition managers and  quality assurance specialists and engineers spend many hours ensuring that any ammo units receive, regardless of condition code, will do what it’s supposed to.  JMC will never ship ammunition to you unless the ammo is determined to be reliable and safe to use.

Eyeball the charts below for the latest tire and wheel assembly NSNs for Army vehicles.


Vehicle Assembly NSN Tire NSN Size
M977 HEMTT w/o CTIS 2530-01-477-1660 2610-01-334-2694 16.00R20
M1070/74/75 PLS/HET truck w/CTIS 2530-01-506-2715 2610-01-334-2694 16.00R20
M1000 HET trailer 2530-01-506-5762 2610-01-323-4813 215/75R17.50
M989A1 HEMAT trailer 2530-01-506-7324 2610-01-452-0605 385/65R22.50
M117 ASV 2530-01-478-0593 2610-01-479-4200 14.00R20
LAV 2530-01-532-5635 2610-01-527-8260 325/85R16



Buffalo (front) 2530-01-535-9462 2610-01-334-2694 16.00R20
Buffalo (rear) 2530-01-535-9459 2610-01-334-2694 16.00R20
Buffalo (front for hull #’s 65-current) 2530-01-554-6621 2610-01-334-2694 16.00R20
RG31 (MK2 and MK3) 2530-01-541-5364 2610-01-537-4093 365/80R20


Vehicle Assembly NSN Tire NSN Size
FMTV A0/A1 (M1078-M1090, M1092, M1093, M1096, M1148, M1157) 2530-01-500-4619 2610-01-356-9098 395/85R20 MV/T (Goodyear); MIL395/85R20 XML (Michelin)
FMTV LTAS (A1P2) 2530-01-571-5857 2610-01-564-6172


2610-01-572-6017 (Michelin)

395/85R20 MV/T (Goodyear);

395/85R20 XZL+ (Michelin)

M923A1 & M939A1/A2 2530-01-506-7243 2610-01-214-1344 14.00R20
M818/M926/M939 w/o ABS 2530-01-506-7244 2610-00-262-8653 11.00-20.00
M939 with ABS 2530-01-506-8319 2610-01-473-3997 11.00R20


Vehicle Assembly NSN Tire NSN Size
M915A2 (front), M969, M969A1/A2, M871, M129A2C, M129A3 2530-01-506-4125 2610-01-045-3688 11.00R22.50
M915A3 2530-01-506-4128 2610-01-481-5378 11.00R22.50
M915A4/A2 (rear), M871A1, M871A2, M871 2530-01-506-4129 2610-01-481-5378 11.00R22.50
M917A1 front 2530-01-506-4131 2610-01-436-3332 385/65R22.50
M917A1 rear 2530-01-506-4132 2610-01-436-3334 315/80R22.50
M916A1/A2 rear 2530-01-506-4133 2610-01-436-3334 315/80R22.50
M916A3 (up-armor front) 2530-01-557-2625 2610-01-552-6448 425/65R22.50
M916A3 (up-armor rear, right outer, left inner) 2530-01-584-7917 2610-01-514-3999 315/80R22.50
M916A3 (up-armor rear, left outer, right inner) 2530-01-584-7915 2610-01-514-3999 315/80R22.50
M920 2530-01-506-4136 2610-01-332-1564 11.00R24
M915A2 (up-armor) 2530-01-537-8294 2610-01-465-5823 12.00R22.5
M915A3 (up-armor) 2530-01-537-8297 2610-01-465-5823 12.00R22.5
M915A4 (up-armor) 2530-01-537-8299 2610-01-465-5823 12.00R22.5
M878A2 2530-01-514-5105 2610-01-507-3633 11.00R22.50





Vehicle Assembly NSN Tire NSN Size
HMMWV/M1101 trailer L/R D 2530-01-493-5859 2610-01-333-7632 37.0/12.5R16.5
HMMWV/M1101 trailer L/R D (24 bolt rim w/ Michelin Baja/ Goodyear MTR tire) 2530-01-558-2138



2610-01-541-4090 37.0/12.5R16.5
HMMWV/M1101 trailer L/R E (24 or 20 bolt rim w/Goodyear MTR tire/Michelin Baja T/A) 2530-01-563-8620 2610-01-563-8328 37.0/12.5R16.5
M35A2/M200 trailer M149A2/M105A2/ M373A2/M332/M313/M750 2530-01-506-5910 2610-00-262-8677 9.00-20
M35A3 2530-01-506-5915 2610-01-397-6976 14.50R20


Vehicle Assembly NSN Tire NSN Size
M1076 PLS trailer 2530-01-500-4991 2610-01-357-8333 15.50/80R20
M860A1 trailer (Patriot) 2530-01-506-7315 2610-01-500-4505 445/65R22.5
M870 trailer 2530-01-508-6677 2610-01-325-1934 10.00R15
M870A1 trailer 2530-01-506-7646 2610-01-325-1934 10.00R15
M870A3 trailer 2530-01-571-7223 2610-01-518-5292 275/70R22.5
M1062 trailer 2530-01-506-7648 2610-01-045-3688 11.00R22.50
M172A1 trailer 2530-01-506-7650 2610-01-325-1934 10.00R15
M129A4 semitrailer 2530-01-514-7903 2610-01-045-3688 11.00R22.50
M1061A1 2530-01-514-7909 2610-01-204-4488 12.00-16.50
M119A2 (left side) 2530-01-541-7004 2610-01-551-2684 9.00-16
M119A2 (right side) 2530-01-541-7001 2610-01-551-2684 9.00-16
FMTV trailer (M1082, M1095) 2530-01-542-7405 2610-01-518-5292 275/70R22.5
M871, M871A1, M871A2 2530-01-506-4129 2640-01-481-5378 11.00R22.50
M871A3 2530-01-508-2786 2610-01-519-0940 255/70R22.5
M872-series trailer 2530-01-547-4136 2610-01-506-0388 11.00R22.50
M872A4, M871R,M871A1R, M871A3R & M871A2R 2530-01-584-7914 2610-01-569-2153 11.00R22.50
M200A1, M149A1/A2, M105A2/A3, M103A3 2530-01-528-9461 2610-01-063-7947 10.00R22.5
M967A2/M969A3 2530-01-527-4609 2610-01-045-3688 11.00R22.50
LHS trailer (M1147) 2530-01-542-7405 2610-01-518-5292 275/70R22.5


Vehicle Assembly NSN Tire NSN Size
10K ATLAS forklift (right) 2530-01-446-1035 2610-01-459-0440 17.50-25
10K ATLAS forklift


2530-01-514-8514 2610-01-459-0440 17.50-25
4K RTFL (JI CASE M4K) 2530-01-506-6873 2610-01-320-0460 15.00-19.50
4K Entwistle forklift 2530-01-596-0860 2610-01-320-0460 15.00-19.50
M10A 10K (right side) 2530-01-506-6884 2610-00-726-5168 20.50-25
M10A 10K (left side) 2530-01-527-9583 2610-00-726-5168 20.50-25
50K RTCH (Caterpillar) 2530-01-506-6885 2610-01-114-3732 35.00/65R33
50K RTCH (Kalmar) 2530-01-484-1419 2610-01-483-5851 29.50-35

(right side)

2530-01-518-3656 2610-00-726-5164 17.50-25

(left side)

2530-01-518-3659 2610-00-726-5164 17.50-25
IHMEE (right) 2530-01-543-8303 2610-01-517-5835 14.00R24
IHMEE (left) 2530-01-543-8304 2610-01-517-5835 14.00R24
130G grader (right side) 2530-01-549-6588 2610-01-543-4493 13.00-24
130G grader (left side) 2530-01-582-3904 2610-01-543-4493 13.00-24
MW24C (right side) 2530-01-581-5782 2610-01-726-5165 20.50-25
MW24C (left side) 2530-01-584-7913 2610-01-726-5165 20.50-25
CS-563D vibratory roller 2530-01-572-7187 2610-01-559-2780 23.1-26
SEE 2530-01-527-9584 2610-01-220-6413 12.50R20


Vehicle Assembly NSN Tire NSN Size
BAE RG33/RG33 HAGA 2530-01-555-4810 2610-01-552-5577 395/85R20 XZL
BAE RG33/RG33 HAGA PLUS 2530-01-563-0583 2610-01-561-7314 16.00R20 XZL
BAE TVS Caiman 2530-01-555-4749 2610-01-559-2516 395/85R20 XML
BAE TVS Caiman PLUS 2530-01-565-2137 2610-01-564-6172 395/85R20
Navistar MaxxPro & MaxxPro PLUS (front axle) 2530-01-555-5456 2610-01-552-5577 395/85R20 XZL
Navistar MaxxPro PLUS (rear axle) 2530-01-565-5657 2610-01-561-8321 12.00R20
Navistar DASH 2530-01-570-6352 2610-01-572-6017 395/85R20 XZL+LR J
GDLS RG31 365 w/steel rim 2530-01-560-8477 2610-01-388-6679 365/85R20XZL
GDLS RG31A2 365 w/aluminum rim 2530-01-572-5907 2610-01-388-6679 365/85R20 XZL LR J
GDLS RG31A2 395 w/aluminum rim 2530-01-572-5445 2610-01-552-5577 395/85R20 XZL LR J
M-ATV 2530-01-576-5896 2610-01-572-6017 395/85R20 XZL+LR J
M-ATV UIK 2530-01-592-6682 2610-01-561-7314 16.00R20 XZL