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Western Star M4866S

Heavy utility truck

Western Star M4866S

The Western Star M4866S truck is referred as Heavy Engineering Support Vehicle in Canadian service

Entered service 1996
Configuration 6x6
Cab seating 1 + 1 men
Dimensions and weight
Weight (empty) 15.36 t
Payload capacity 15 t
Length 10 m
Width 2.59 m
Height 3.29 m
Engine Caterpillar C12 diesel
Engine power 410 hp
Maximum road speed 108 km/h
Range 700 km
Gradient 60%
Side slope 30%
Vertical step ~ 0.5 m
Trench ~ 0.9 m
Fording 0.8 m


   The Western Star M4866S is a high mobility truck is in service with Canada. It is a version of the 4800 series, sharing engine and the cab. Vehicles were modified for military use and have an all-wheel drive. A total of 54 trucks were ordered for the Canadian forces to replace the ageing Kenworths. These were delivered in 1996-1997. Additional 11 trucks were delivered in 2000-2002. This truck is referred as Heavy Engineering Support Vehicle (HESV) in Canadian Army service.

   This military vehicle has a payload capacity of 15 t. Three main versions were produced for the Canadian Army. Versions include a Palletized Loading System (PLS), dump truck with 3-way tipping and tractor truck.

   The Palletized Loading System is capable of carrying interchangeable demountable modular units, such as rear dump module, 20 ft ISO containers, NATO flatracks, various self-containing modules, such as radar station, fuel, water units, dump module and so on.

   The dedicated Western Star HESV dump truck carries a specially designed dump module, which has removable sides. Alternatively it can be used as a general purpose cargo carrier.

   The tractor truck is used in conjunction with semi-trailers.

   The Western Star M4866S has a similar cab to the 4800 series models. It accommodates driver and one passenger. There is a sleeper bunk immediately behind the cab. It can be also used as a storage compartment. There is also a roof rack for storage. An add-on armor kit was developed for this truck. It provides protection for the occupants against small arms fire, artillery shell splinters, landmines and IED blasts.

   This military truck is powered by a Caterpillar C12 turbocharged diesel engine, developing 410 hp. Engine is coupled with Allison automatic gearbox with 5 forward and 1 reverse gears. A centralized tyre inflation system was not available on production models, however later it was proposed as upgrade for in-service trucks. This vehicle can operate in broad temperature range, ranging from -40C to +40C.

   Between 2002-2004 additional 30 trucks were delivered to the Canadian Army. However these vehicles are based on a newer and revised Western Star M4900SA chassis. Furthermore all trucks delivered until 2002 are scheduled for replacement.


Western Star M4866S

Western Star M4866S

Western Star M4866S

Western Star M4866S

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