Mine Resistant Ambush Protected Vehicle M1224 MaxxPro1-7

M1224: General
Date of first acceptance 2007
Manufacturer Navistar Defense Crew
7 men:
  • Commander in hull front right
  • Driver in hull front left
  • Gunner in hull center
  • 2-4 passengers
M1224: Dimensions
Combat weight 37,850lbs
17,170kg
Height 120"
305cm
Length 254"
645cm
Width 102"
259cm
Wheelbase 153"
389cm
Ground clearance 10.9"
27.7cm
M1224: Armament
Type Mount Traverse Elevation
.50cal M2HB MG
--OR--
7.62mm M240B MG
--OR--
40mm Automatic Grenade Launcher Mk19 MOD3
Turret 360° Manual
M1224: Armor
Assembly
Bolting
M1224: Automotive
Engine MaxxForce D8.7I6; 6 cylinder, 4 cycle, in-line, turbocharged diesel
Horsepower 330@2100rpm Torque 950 ft-lb@1250rpm Fuel capacity 57gal
216L
Transmission Allison 3000, 5 speeds forward, 1 reverse
Steering Hydraulically-assisted recirculating ball, steering wheel
Brakes Air-operated S-camshaft drum with anti-lock system and traction control
M1224: Suspension
Type Road wheels Shock absorbers
Semi-elliptic leaf spring 2/side On each wheel
M1224: Performance
Max level road speed 69.2mph
111kph
Max grade 60%
Max sideslope 30% Min turning diameter 62'
19m
Max fording depth 36"
91cm

The 4x4 M1224 MaxxPro (Maximum Protection) was a Category I mine resistant ambush protected vehicle (MRAP). Category I MRAPs, which are mine resistant utility vehicles (MRUVs), were intended to be fireteam-sized vehicles capable of carrying a crew of three and three passengers. The MaxxPro was designed to use the Workstar 7000 truck chassis fitted with a V-shaped armored crew capsule designed with help from Plasan Sasa of Israel. An 18,000lb (8200kg) winch was mounted on the front with 70' (21m) of 0.625" (1.59cm) cable. A 2-speed transfer case provided a low range for severe conditions; the vehicle was required to be halted to engage four-wheel drive or to change the transfer case from high to low range.

Thanks to increased prevalence of improvised explosive devices using explosively-formed penetrators, the MRAP Expedient Armor Program (MEAP) was developed to add standoff applique armor to the vehicles. This kit increased the weight by 4500lbs (2040kg), the width by 5" (13cm), and raised the center of gravity by 2.2" (5.6cm). Vehicles fitted with the MEAP kit were designated M1224A1. It was recommended that the vehicle's speed be kept at 55mph (89kph) or below on paved roads due to handling issues; and 35mph (56kph) on smooth secondary road surfaces and 10mph (16kph) cross-country or on rough secondary road surfaces due to the the possibility of suspension damage. Likewise the vehicle was restricted from climbing a grade of more than 50% and parking on a grade of over 20%. The doors of the M1224 fetured a pneumatic system to assist with opening, but it was necessary to upgrade this to a linear 24-volt electric ball screw-type actuator on the M1224A1. With this, the driver and passenger doors could self-open on 30% grades or sideslopes.

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References

  1. TM 9-2355-106-10/TO 36A12-1C-2400-1 Operator's Manual for Mine Resistant Ambush Protected (MRAP) M1224 (NSN 2355-01-553-4634) (EIC 1XF) M1224A1 (NSN 2355-01-561-0281) (EIC 1XM). Washington, DC: Depts. of the Army and Air Force, 9 Apr 2012.
  2. MRAP Vehicles Handbook: Tactics, Techniques, and Procedures. Ft. Leavenworth, KS: Center for Army Lessons Learned, Sep 2008.
  3. Navistar Defense. International MaxxPro.
  4. Adams-Graf, John, with David Doyle. MaxxPro MRAP: A Visual History of the MaxxPro Mine Resistant Ambush Protected Vehicles. Delray Beach, FL: Ampersand Group, Inc., 2016.
  5. Guardia, Mike. US Army and Marine Corps MRAPs. Oxford: Osprey Publishing Ltd., 2013.
  6. Navistar Defense, LLC. "Navistar Defense - Navistar Defense MaxxPro MRAP - MRAP Vehicles - Military Vehicles." Navistar Defense. Accessed 22 Sep 2019 <https://www.navistardefense.com/NavistarDefense/vehicles/maxxpromrap/maxxpro_mrap>.
  7. Verdict Media Limited. "MaxxPro MRAP Armoured Fighting Vehicle." Army Technology. Accessed 22 Sep 2019 <https://www.army-technology.com/projects/maxxpro-dash/>.

Last updated 22 Sep 2019.
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