ETO Ordonance Technical Intelligence Report no. 175 10 March 1945
Subject: German Heavy Semi-Tracked Military Tractor, S.W.S.
Observations by: Lt. J.F. Eppes, Ord. Tech. Intell. Team No. 3
German heavy semi-tracked military tractors, "Schwerer Wehrmachtschlepper", have been examined in the area of THIRD U.S. Army. This vehicle is similar in construction to the standard semi-tracked prime movers, the principal difference being the use of a steel track of the design used on German tanks.
2. NAME PLATE DATA
The following data was taken from the plate on the dashboard:
The engine is the Maybach HL 42, 6 cylinder, water-cooled, gasoline engine, with pushrod operated overhead valves. The two carburetors are of Solex manufacture, type JFF 30. Ignition is by Bosch magneto mounted at the rear of the engine. The fuel tank is mounted at the rear of the chassis.
An instrument panel on the dashboard carries:
From the engine the drive is taken through a dry plate clutch to a gearbox with four forward speeds and one reverse. The gearbox is manufactured by Zahnrad Fabrik - Friedrichshafen and its type is "K 40 D". There is, in addition, a high-low ratio box alongside the main gearbox.
Steering is by the steering wheel through a worm for the front wheels and in some cases aided by a controlled differential system for the tracks. The steering linkage to the front wheels is coupled to the track steering brakes, though under normal driving conditions the vehicle is steered only by use of the steering wheel. In difficult terrain, steering by the tracks iridependently may be effected by means of a rontrol switch on the dashboard to the left of the steering column. The steering and tracks brakes are operated hydraulically with air assistance. The steering linkage for the front wheels is shown in photo #3.
7. FRONT SUSPENSION
Suspension of the front axle is by a transverse, semi-elliptic spring anchored at the center. The front wheels are of the pressed steel, flat rim type. The tires are manufactured by "DEKA" and are size 270 x 20. They are held on the wheels by split locking rings. The spare wheel is carried mounted on the back of the cab.
8. REAR SUSPENSION
a. Tracks: The tracks are of skeleton type with chevroned soles and are believed to be cast of manganese steel. Each link consists of two members, a plain shoe and a shoe with a double guide horn. The linkage is made with a single headed pin retained by a sleeve and cotter pin (photos #3 and #4). The width of the shoe is 19¾ inches. Track adjustment is by draw bolt fastened to the idler mounting.
The body of the vehicle is fastened to the longitudinal frame members. It is built of l 1/2" tongued and grooved board, amply braced with steel strips. The sides and tail gate are hinged along the lower edges. Metal supports are fitted at front and rear for a canvas cover (Photo #2). The cab is spacious and is open at the top and sides. A canvas hood is fitted. This may be folded back when desired. The windshield is hinged to fold forward (Photo #1)
For the chief ordnance Officier:
Heavy semi-tracked tractor, S.W.S. Note front suspension and shock absorbers, and canvas cover for driver's cab.
Right rear view showing track suspension. Note fuel tank filer pipe below tailgate, hinged sides, supports for cover over body, and spare tire mounting.
Front susspention and steering linkage, track and interleaving bogies.
Drive sprocket and bogie wheels