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Diamond 981 (M20), 6 x 4, 6V (Front view, right side)

 
 

Front view, right side

Picture courtesy of Henrik Juul-Lauritzen, Holstebro


Danish Army Specific: Delivered as part of the MDAP 1951/55. A total of 28 vehicles were delivered with the standard M9 trailer. Intentionally use in Denmark was artillery-tractor, but because of lack of all-wheel-drive the M20, coupled to a 55 ton Blumhardt trailer, was used as prime-mover for the Centurion.
Both soft- and hard-top version were used.
The Diamond were replaced by
Magirus-Deutz 270D34AS from 1971 onwards.
Historical
: Produced to a British specification drawn in 1940, due to the fact that no British manufacturer was able to produce tank transporters in the quantity needed.
In conjunction with the Washington-based British Purchasing Commission Diamond T took a heavy-duty truck chassis and from it, developed a diesel-engined ballast tractor which, coupled to a multi-wheeled draw-bar trailer was capable of hauling 40 to 45 tons.
A prototype was ready for approval in September 1941, although production had taken place since mid 1941.
Its main use was evacuation form points along the axis of evacuation and supply. Its use in battlefield recovery was limited because it was not designed for travel over rough and muddy terrain.
The rear body consisted of a large, flat-sided box which was designed to carry up to 6.750 kg (15.000 lb.) in cast-iron weights to provide sufficient traction for the rear wheels.
Produced with open cab and folding windscreen from august 1943. Around the same time winch controls were moved outside the cab and placed alongside the winch itself.
Adopted in the US Army as "substitute standard" and with the introduction of the M26 "Dragon Wagon" downgraded to "limited standard" in June 1943.
More than 6.500 produced from 1941 until 1945, some under a subcontract by FWD.
The standard trailer was a 40 ton drawbar unit known as M9 and produced by Checker Cab, Cranes, Dyson, Fruehauf, Pionter-Williamette, Rogers and Winter-Weiss.
During the 1950s many of the British Diamonds were re-powered with a Rolls-Royce C6NFL-134 12.1 liter petrol-engine.
A total of 6.554 vehicles were produced.
Length: 7.10 m (277 inches).
Width: 2.60 m (101 inches).
Height: 2.97 m (115 inches).
Weight: 20.400 kg (44.880 lb.).
Engine
: 6-cylinder Hercules, type DFXE, 14.666 cm3 (893 cubic inches) displacement, liquid cooled.
Horsepower: 201 at 1.600 rpm.
Transmission: 4-speed, type Fuller 4B86.
Transfer case: 3-speed, type Fuller 3A86 (later Fuller 3A92).
Electrical system: 24 volt, negative ground.
Brakes: Air (Bendix-Westinghouse).
Tyres: 12.00 - 20.
Fording depth:
without preparation: 0.81 m (32 inches).
with deep water fording kit: N/A.
Fuel type: Diesel.
Fuel capacity: 567 liter (124 gallons).
Range: 250 km (156 miles).
Crew: 1 + 1.
Additional: 20 ton Gar Wood 5M723B chain-driven winch center-mounted behind cab. The winch cable could be treaded through a roller alongside the radiator for operations requiring a front winch. A torque control would stop the winch if the line pull became acesssive. Pintle hooks were provided front and rear.


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