M35 2½-ton cargo truck

This article is about the M35 family of military trucks. For the original World War II "Deuce-and-a-half", see GMC CCKW.
For other uses, see M35 (disambiguation).
Truck, Cargo, 2½-ton, 6×6, M35

An M35 2½-ton cargo truck
Type 2 1⁄2-ton (2,268kg)[lower-alpha 1] 6x6 cargo truck
Place of origin United States United States
Production history
Designer REO
Designed 1944
Manufacturer REO, Kaiser, AM General, Kia and Ssangyong (South Korea only), Bombardier (Canada only)
Produced 1950–88 (M35A1, M35A2) 1993–99 (M35A3)
Variants M35A1, M35A2, M35A3
Specifications (with winch[1])
Weight 12,880 lb (5,840 kg) empty
17,880 lb (8,110 kg) loaded
Length 274 3⁄4 in (6.98 m)
Width 93 in (2.36 m)
Height 111 in (2.82 m) to cab
Engine REO OA-331
127 hp (95 kW)
Transmission 5 spd. x 2 range trf. case
Suspension Beam axles on leaf springs
Operational
range
 300 mi (480 km)
Speed 58 mph (93 km/h)

The M35 2½-ton cargo truck is a long-lived 2½-ton 6x6 cargo truck initially used by the United States Army and subsequently utilized by many nations around the world. Over time it evolved into a family of specialized vehicles. It would not only inherit the World War II GMC CCKW's famous "Deuce and a Half" nickname but forge its own legacy.

The M35 started as a 1949 REO Motor Car Company design for a 2½-ton 6x6 off-road truck. This original 6-wheel M34 version was quickly superseded by the 10-wheel M35 design. While the basic M35 cargo truck is rated to carry 5,000 pounds (2,300 kg) off-road or 10,000 pounds (4,500 kg) on roads, they have been known to haul twice as much as rated. Trucks in this weight class are considered medium duty by the military and Department of Transportation.

Specifications

Dimensions

An M35A2 cargo truck with a 10,000 pounds (4,500 kg) PTO-driven Garwood front winch is 112 inches (2.8 m) tall, 96 inches (2.4 m) wide and 277 inches (7.0 m) long, and 13,030 pounds (5,910 kg) empty (13,530 pounds (6,140 kg) empty when equipped with the front mount winch, according to dashboard dataplates). The standard wheelbase cargo bed is 8 feet by 12 feet (2.4 x 3.6 m). The M35A2 was available with a canvas soft top or a metal hard top. Metal hard-top configurations are most often found on vehicles that have been equipped with cold-weather gear, including additional insulation in the cab, as well as engine coolant or multifuel-fired cab personnel heaters.

The curb weight of an M35 is between 13,000 pounds (5,900 kg) and 16,000 pounds (7,300 kg) empty, depending on configuration (cargo, wrecker, tractor, etc.). Its top speed is 56 mph (90 km/h), though maximum cruising speed is approximately 48 mph (77 km/h). Fuel economy is 11 mpg-US (21 L/100 km; 13 mpg-imp) highway and 8 mpg-US (29 L/100 km; 9.6 mpg-imp) city, giving the deuce a 400–500-mile (600–800 km) range on its 50 U.S. gallons (190 L; 42 imp gal) single fuel tank. On average, most operators experience tank averages of 8–10 mpg-US (29–24 L/100 km; 9.6–12.0 mpg-imp) for an unladen vehicle.

Drivetrain

The M35A2 is commonly powered by an LDT 465 engine, made by either Continental Motors Company, Hercules, or White Motor Company. It is an in-line, 478-cubic-inch (7.8 L), six-cylinder, turbocharged multifuel engine developing 134 bhp (100 kW) and 330 pound force-feet (447 N·m) of torque. This is coupled with a 5-speed manual transmission and divorced 2-speed transfer case (either a sprag-operated transfer case Rockwell 136-21 or air-operated selectable transfer case Rockwell 136-27). Multifuel engines are designed to operate reliably on a wide variety of fuels, including diesel fuel, jet fuel, kerosene, heating oil or gasoline. Gasoline may be used only in an emergency because it does not properly lubricate the injector pump. While using gasoline, common practice calls for the addition of at least 1 U.S. quart of clean motor oil per 15 U.S. gallons of gasoline (1 imp qt/13 imp gal; 1 L/60 L) for proper pump lubrication where available.

Although the A2 version is the most common, there are four different iterations: Standard, A1, A2, and A3. These changes mainly had to do with the engine and transmission components. Standard M35 had a REO "Gold Comet" or Continental OA331 inline-6 gasoline engine. Some had 4-speed transmissions but most had "direct 5th" transmissions. The gasoline-powered deuces were built primarily by REO Motors, however, Studebaker also had a manufacturing contract from at least 1951 into the early 1960s. Curtis-Wright also had a contract in at least 1958 to build dump trucks with the Continental gas engine. The A1's had Continental LDS-427-2 turbo engines, equipped with either a model 4-450 Schwitzer turbo or a 4D454C Schwitzer turbo on later models, and 5th gear was an overdrive. The 140 hp engines were not reliable, suffering frequent headgasket failures.

The first A2 trucks received the bigger LD-465-1 naturally aspirated 478 CID multifuel engines, keeping the OD transmission of the A1s. Through the years the trucks were upgraded to LD 465-1c engines, with 60Amp alternator instead of the 25Amp generator. With the addition of a turbocharger, the engine evolved into the LDT 465-1c (turbo clean air). The turbo was added more to clean up the black exhaust on the Non Turbo engines, than to add power; the HP was raised from 130 to only 135 HP. Turbo models used: 3LD305 (early engines only) and 3LJ319 (the "whistler") The LDT-465-1D was the last version of the Multi Fuel, it had the same 3LJ319 Turbo (whistler), or the quieter 3LM39 (non-whistler), better head gasket sealing and head cooling.

M35A3

From 1994 until 1999, the M35A3 variant was introduced as part of Extended Service Program. Usually, A3 vehicles have a Caterpillar 3116 Diesel engine and had their manual transmissions replaced with automatic ones, as well as receiving numerous other improvements with a redesigned frontal appearance. No new A3 standard-transmission vehicles were produced, all vehicles being upgraded from previous configurations during the rebuild process. The exception is some M109A3 shop vans. A small number of M109A3s were upgraded to A4 specifications using the M35A3 upgrade parts and procedures. As-built original A1's are gasoline-powered, A2's use the LDS 427-2 multifuel engine, and A3 use the LD/LDT 465-1c multifuel engine. It is common, however, to find rebuilds of former gas-powered REO and Studebaker models having A1 and A2 multifuel configurations.

Brakes

Brake system is air-assisted-hydraulic six wheel drum brakes with a driveline parking brake, although gladhands exist on the rear of the vehicle for connection to trailers with full air service and emergency brakes. Braking performance of the truck is similar to other power drum brake vehicles of this size. Each drum was designed with maximum efficiency in mind, and individual drums can dissipate up to 12 kilowatts (16 hp) of braking heat. Due to this brake system and GVWR under 26,001 pounds (11,794 kg), the big deuce can be driven without a commercial driver's license in most states. Even California does NOT require a CDL to operate an M35 on public roads because even though it has three axles and an air-assisted braking system, the maximum gross weight is still under 26,000 lb (12,000 kg), making it eligible for class C on-road driving; and because the primary braking system is hydraulic, not air.

Electrical

The electrical system is 24 volt, using two 12 volt 6TL-series military grade batteries run in series.

Operational history

M135 is to the right of M35

The M35 family was introduced in 1950 to replace the GMC CCKW and M135 family cargo trucks that constituted the backbone of U.S. military transport since their introduction in World War II. The M35 would not completely replace the M135 family until the middle of the 1960s. However, the M35 would quickly become the dominant truck in its class in the U.S. military, serving with all the services in various capacities. For a short period the M35 was called "The Eager Beaver" by the U.S. Army due to its fording ability. But the name was never popular and forgotten in a few years.[2]

The M35 series was to be replaced by the Light Medium Tactical Vehicle. However, many United States National Guard and Reserve units continued to use them as the new family of vehicles was phased in. The M35 series was used by the United States in Iraq during Operation Iraqi Freedom. The M35 Truck was not used by the United States Marine Corps and currently issued M35 to the U.S. Army Service.

In order to replace the vintage fleet of 1950's era M135 the Canadian Army adopted license built versions of the M35 (and M36 variant) in 1982, built in Canada by Bombardier. As of 2014, the trucks, designated MLVW (Medium Logistics Vehicle, Wheeled) were still in service. Canadian vehicles featured an automatic transmission, six wheels instead of ten (using single wheels on the tandem rear axles instead of dual wheels), and an ether-start for winter operations. Canada had been investigating a replacement under the Medium Support Vehicle System Project, and a vehicle has been selected. The MLVW's were initially not deployed with Canadian Forces in Afghanistan because of their lack of armor protection. An armor kit was subsequently developed leading to a limited deployment of the vehicles.[3]

Variants

The M34/M35 series of trucks came in wide array of variants and subvariants. As noted engine differences could be noted by the A1, A2, or A3 suffix, but additional suffix letters were also sometimes added. These letters had different meanings depending on what variant to which they were applied.

Under the nomenclature system used by the U.S. Army Ordnance Corps Supply Catalog (known as G-series) the M34/M35/M36 family is designated G742.

Cargo

AM General M35A2 with winch and camouflage cargo cover
Bombardier MLVW licensed version of M35, with C3 howitzer in tow

As noted the original basic gasoline-powered truck variants were first the M34, and then the M35. A long wheel-base variant, designated the M36, was also developed (featuring a 16-foot (4.9 m) cargo bed). Variants with a C suffix (such as M35A2C or M36A2C) featured a straight drop-side cargo bed. The M44 and M45 were simply the chassis designation for the 2½-ton series, and this cab/chassis would serve as the basis for many more specialized variants.

In the 1980s, Bombardier produced a M35 variant for the Canadian Forces' medium logistic vehicle, wheeled platform. This featured an Allison MT-643 automatic transmission, and a Detroit Diesel engine displacing 500 cubic inches (8.2 L). The original 11.00X20 Bias ply tires on split ring type rims were later changed fleet-wide to Michelin radials on bolt-together rims in 2002, due to safety concerns over the split rims.

Tank truck

A USAF air base structural fire fighting engine/pumper 530B based on M35

The M49 fuel tanker and M50 water tanker variants were initially based on the M44 chassis. The M49C series, however, were vehicles converted from C series drop-side cargo variants. M49's have 1200-gallon tanks. Early models had triple compartments (200g front, 400g mid, baffled 600g rear),but most models have two 600-gallon baffled tanks. The M50 had a 1,000-U.S.-gallon (3,800 L; 830 imp gal) water tank, of which later variants had internal baffles to combat weight transfer during motion. In some areas the M35 is still used today as a wildland firefighting truck with a portable water supply and fully operational pump.

Van

An M109A3 Shop Van

A number of variants with van bodies, primarily for use as maintenance shop vans, were also created. The basic model was the M109, with a variant that could mount the PTO winch was designated M185. The M185 was a machine shop version of the M109 that carried a light duty crane, tools, other items. It often towed a M105 trailer. An expandable van variant with hydraulic lift gate was designated M292. Two variants of the M109 were specifically developed as service vehicles for the MGM-18 Lacrosse missile system, the XM411 for the Ground Guidance Electronic Equipment, and the XM412 with special tools and test equipment for the electronic guidance and control system. A medical van variant was designated M132.

Wrecker and Tractor

Wreckers based on the M35 truck were designated as the M60 and M108. Two tractor variants for towing semi-trailers were developed, the M48 and M275. The M48 featured a full-length wheelbase (identical to the M35 cargo), while the M275 featured a shorter wheelbase for reduced weight and greater maneuverability. However, due to the smaller size and lower power of the 2½-ton trucks, most heavier loads were handled by their respective 5-ton counterparts. As a result, few were produced.

Construction

A number of specialized construction variants were developed. The M47 and M59 dump trucks were developed, based on the M44 chassis and M35 cargo truck respectively. An improved dump truck, again based on the M44 and designated the M342 was designed to replace both the M47 and the M59, as well as the M135-based M215.

Also under the M44 chassis was the signal corps V-17 pole derrick, and the V-18 auger truck, later replaced by the M35 upgrade below.

The M108, based on the M44 chassis, carried a crane and was used for many tasks including to deploy missiles such as Lacrosse. The M756 was a specialized pipeline repair vehicle, the M763 was designed for telephone line repair, and the M764 was a specialized earth-boring and pole-setting variant.

Gun trucks

Eve of Destruction, a 5-ton M54-based gun truck at Fort Eustis

The versatility of the pattern was perhaps shown best in its usage as an armored "gun truck" for patrol duties and convoy escort.

The simplest examples were produced by simply placing an existing light gun mount directly onto the cargo bed of the truck, and securing it in place. No armouring or special support equipment was installed. One such conversion was performed in Congo-Leopoldville in 1965, using an Oerlikon GAI 20 mm anti-aircraft gun. Another conversion in the Congo entailed mounting pods with 2.75" aircraft rockets on a pedestal on the cargo bed, but this proved unsuccessful.[4]

The first more sophisticated conversions of the pattern were performed by the U.S. military in Vietnam. U.S. Army Artillery Battalions (Automatic Weapons, Self-Propelled) were often assigned Artillery Batteries (.50-caliber), units equipped with M35 trucks and M55 Quadmount systems mounting four M2 Browning machine guns. Units were also authorized a single M60 machine gun and M79 grenade launcher.[5] While the M35 was designed to act as the prime mover for the M55 Quadmount system, which included a towed trailer, the M45 mount was often removed or the wheels removed from the trailer, and the system mounted on the bed of the truck. The M55 system was also mounted on the M54 truck.[6]

More simplified armoring projects were conducted as well, adding armored walls of various thicknesses to standard cargo variants. A smaller bed-mounted multi-angle "box" was also tried.[7] U.S. Army gun trucks used a wide variety of weapons including the M2 Browning machine gun, M60 machine gun, and even the M134 Minigun.

At the end of the Vietnam War most of these vehicles were returned to their standard configuration, except for a single original example shipped to the U.S. Army Transportation Museum at Fort Eustis, Virginia in 1971.[8]

Numerous Vietnam veterans have expended countless hours to build full size replicas of their original Gun Trucks, using M35, M54, and even Army Dump Trucks as platforms, much the same as these veterans did in Vietnam. A functional display replica of the "Psychotic Reaction" Gun Truck Based on an M35A2 chassis is currently in use and being displayed at many military vehicle displays and Vietnam veteran reunions / events.[9]

The concept lived on well after the Vietnam War. El Salvador converted a number of M35 type vehicles into armored trucks in the 1980s, after successful conversions of Magirus Deutz trucks. These vehicles were nicknamed "Mazingers" in reference to the Japanese cartoon Mazinger Z.[10][11]

The Philippine Marine Corps also began converting M35 type trucks to an armored configuration by 2004. The first vehicle, dubbed "Talisman," utilized armor fabricated from derelict LVTP5 amphibious personnel carriers. Later gun trucks were built using more standard components and bear some resemblance to U.S. military vehicles of the Vietnam era.[12] The Philippine Marine Corps had also begun the creation of an anti-aircraft element by 2006, utilizing M35 based vehicles. Two types of vehicles have been seen so far. One utilizes the Mk 56 Mod 0 mount from the Patrol Boat, River, with two M2 Browning machine guns, while the other features another former naval mount with a single Oerlikon 20 mm cannon.[13]

Colombia maintains a fleet of REO M35 "Meteoro" armored trucks. These locally fabricated armored vehicles are used to guard tourist bus caravans as well as mobile checkpoints. Early vehicles were not fabricated to any particular standard and typically hosted three weapon stations that could be fitted with a 7.62 mm (.308-cal) or .50-caliber (12.7 mm) machine gun. The weapon stations may or may not have had a gun shield on any particular vehicle. More recent examples follow a pattern with the cab and fuel tanks armored and the drop side cargo bed converted to an armored box, atop which is a "gun tower," a set of four heavily armored weapon stations, one facing each direction. .50-caliber machine guns are mounted front and back, with 7.62 mm machine guns mounted to the sides. Losses in the Meteoro fleet instigated the purchase of the BTR-80 Caribe.[14]

In addition to the basic cargo version, tank water and fuel. The CEMABLIN-(Centro de Mantenimiento de Blindados del Ejército Venezolano) locally manufactured a version of anti-air defense operations and support, thanks to all the necessary parts were stored and in perfect condition. 6 units were produced in early 1998. The "Fénix" system was assigned to the 1103º BDAA 40mm. based at Fort Yaurepara in Zulia state. But they had problems with the tower's weight and shoot on the move. They were retired in 1998 and substituted by the AMX-13 M55/M4E1 "Ráfaga" 40mm also produced locally stored material advantage and in good condition. The "Fénix" is a M4E1 tower, recovered from a car M42 Duster and 2 M50 machine guns .30 caliber for Protective Part (a cylindrical tower made of welded armor plate with open top with twin mounting Bofors 40 mm gun), mounted on a tactical platform Truck 6x6 2½-ton Reo M-35.

Civilian conversions

The M35-series trucks have been sold as surplus both to military vehicle collectors and to persons or organizations looking for an inexpensive truck capable of off-road operation. Users have included farmers, rural electric utilities and fire departments. Surplus vehicles may be retained in military configuration, or modified to suit the needs of their new owners. Such modifications may include "bobbed" chassis with one of the rear axles removed, new cargo beds or boxes, fuel or water tanks, and conversion of the electrical system to 12 volts.

Weight

Model [15] Type wheelbase Empty Weight Loaded Weight[lower-alpha 2]
M44 Chassis (single rear tires) long 10,225 lb (4,638 kg)[lower-alpha 3][lower-alpha 4]
M45 Chassis short 10,524 lb (4,774 kg) [lower-alpha 3][lower-alpha 4]
M46 Chassis extra long 10,860 lb (4,930 kg) [lower-alpha 3][lower-alpha 4]
M57 Chassis (single rear tires) short 10,943 lb (4,964 kg) [lower-alpha 3][lower-alpha 4]
M58 Chassis short 10,441 lb (4,736 kg) [lower-alpha 3][lower-alpha 4]
M34 Cargo (single rear tires) long 11,775 lb (5,341 kg) [lower-alpha 3] 17,125 lb (7,768 kg)
M35 Cargo long 12,465 lb (5,654 kg)[lower-alpha 3] 17,815 lb (8,081 kg)
M36 Cargo (long bed) extra long 14,280 lb (6,480 kg)[lower-alpha 3] 19,580 lb (8,880 kg)
M48 Tractor long 11,430 lb (5,180 kg)[lower-alpha 3] 18,780 lb (8,520 kg)
M49 Gasoline, tank long 13,895 lb (6,303 kg) 19,245 lb (8,729 kg)
M50 Water, tank long 15,184 lb (6,887 kg) 20,534 lb (9,314 kg)
M59 Dump short 14,050 lb (6,370 kg) [lower-alpha 3] 19,400 lb (8,800 kg)
M60 Light wrecker long 23,960 lb (10,870 kg) 27,810 lb (12,610 kg)
M108 Crane long 19,375 lb (8,788 kg) [lower-alpha 3] 23,225 lb (10,535 kg)
M109 Shop Van long 15,231 lb (6,909 kg) 20,581 lb (9,335 kg)
M275 Tractor short 11,179 lb (5,071 kg) [lower-alpha 3] 18,529 lb (8,405 kg)

Operators

See also

Notes

  1. ↑ Off-road load rating
  2. ↑ With 5,000 lb (2,300 kg) load except M60, M108
  3. 1 2 3 4 5 6 7 8 9 10 11 12 Without winch, with winch add 410 lb (190 kg)
  4. 1 2 3 4 5 Weight without body

References

Citations

  1. ↑ TM-9-2800-1 Military Vehicles. US Depts. of the Army and Air Force. 1953. p. 231. Retrieved 20 Dec 2014.
  2. ↑ "The Submarine Truck's Secrets", June 1951, Popular Science scroll page past diver to see trucks
  3. ↑ Priestly, Stephen. Canadian American Strategic Review. June 2006. "Of Muddles and Medium Trucks – MLVWs and the Perils of Being Out-of-Step". Access Date: 26 April 2008.
  4. ↑ Photo evidence
  5. ↑ Rottman, 2002. p. 8
  6. ↑ Lyles, 2003. p. 10
  7. ↑ Lyles, 2003. pp. 21–22
  8. ↑ Lyles, 2003.
  9. ↑ Lyles, 2012.
  10. ↑ Montes, 2001. p. 30
  11. ↑ Spencer, 1995. p. 13
  12. ↑ Cruz, M. Manoski's Orbat 7 December 2004. Philippine Marine Gun Trucks. Access Date: 26 April 2008
  13. ↑ Cruz, M. "Manoski's Orbat" 10 June 2006. Marine Artillery. Access Date: 26 April 2008
  14. ↑ Colombia: Security & Defense REO M35 Meteoro Blindado Mod. 2
  15. ↑ Doyle, David (2003). Standard catalog of U.S. Military Vehicles. Kraus Publications. pp. 127–55. ISBN 0-87349-508-X.

Sources

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