Combat vehicles / Logistics vehicles / M746 HET

M746 HET

General Facts

  • TYPE
    Heavy equipment transporter

  • ORIGIN
    United States

  • NICKNAMES
    Heavy Equipment Transporter 70 (HET-70)

  • DESIGNED
    1965 - 1971

  • DESIGNER
    Chrysler

  • PRODUCTION
    1975 - 1977

  • PRODUCERS
    United States - WardLaFrance

  • QUANTITY
    A total of 193 M746 have been built

  • UNIT COST
    Unknown

  • CHARACTERISTICS
    Good mobility and turn radius on road
    Ability to recover vehicles using winches
    Limited mileage and speed
    Moderate off road capability
    Cannot transport loads over 60 t

Introduction

The M746 is a heavy equipment transporter of US origin. It was developed in the late 1960's in the joint US-German HET-70 program that was to develop a tank transporter for the MBT-70 program. The MBT-70 program was disolved in 1970. In 1971 Chrysler finished the design and sold it to WardLaFrance for production. Faun finished the HET-70 program in its own way and developed the similar looking, yet very different SLT-50-2.

Layout

The M746 is clearly shows its German influence as it differs much from other American heavy equipment transporters. The M746 has an 8x8 chassis with the engine mounted on top of the forward pair of axles. A three man forward control cab is fitted. Two sets of winches and the fifth wheel are located above the rear pair of axles.

Cargo capacity

The M747 trailer is capable of carrying up to 60 t of cargo. It was often used to transport the M60 Patton main battle tank. Vehicles can enter the low loader using the two side by side ramps at the rear. The two winches have a combined power of 54 t. This allows the M746 to be used as a wrecker. Broken down vehicles can also be pulled onto the trailer.

Mobility

The 8x8 chassis provides a good mobility on roads and moderate mobility in the field. With steering on both front axles the turn radius is limited for a tank transporter. The 625 hp diesel engine allows for a maximum road speed of 62 km/h. The cab can be reduced in height for air transport.

Users

The M746 was adopted by the US Army in limited numbers. A total of 125 vehicles were acquired and used in the European theater. In service the M746 was supplemented by the M911. The sole export customer was Morocco with an order of 68 vehicles.

Variants

M746 HET

The M746 is a Cold War era heavy equipment transporter (HET). Only a single variant was ever produced. The M746 is used in combination with the M747 four axle 60t trailer. Being an 8x8 vehicle with forward control cab the M746 is easy to distinguish from other US trucks. The German Faun SLT-50-2 looks rather similar since it was developed from the same HET-70 program.

TypeHeavy equipment transporter
Crew1 + 2 (driver, 2 passengers)
Length8.23 m
Width3.05 m
Height3.05 m (cab), 2.51 m (cab lowered), 1.6 m (5th wheel)
Ground clearance0.33 m
Weight20.4 t empty, 39.0 t loaded
Ground pressure?
WheelbaseWheeled chassis, 8x8, 1.5 + 2.27 + 1.5 m wheelbase, 2.55m track, 18.00 x25 tires
Turn radius?
EngineDetroit Diesel, 12V-71(T) 12-cylinder diesel, 625 hp at 2.500 rpm
Power ratio16.0 hp/t
TransmissionAutomatic, 5 forward, 1 reverse
Speed62 km/h on road, 8 km/h at 15% gradient
Fuel530 L
Range322 km
Wall?
Trench?
Gradient?
Fording1.2 m
ArmorNo
NBC equipmentNo
Night visionNo
SmokeNo
Remarks2x 27t winch, 20.4 t pressure on 5th wheel, 62.1 t towed load
Armament-
Weapon1-
Weapon2-
Weapon3-
Weapon4-
Weapon5-
Weapon6-

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