The following information concerning the German heavy transport trailer
was obtained in a recent examination of one of the vehicles by our own Ordnance officers.
The trailer has an overall length of 38 feet 10 1/2 inches, wheelbase from
front bogie to rear bogie of 28 feet 8 inches; its total weight unloaded is 31,810
pounds and its load-carrying capacity is approximately 35 tons.
The trailer consists of front and rear bogies with a load platform suspended
between them. This platform is constructed of two main I beams and two secondary
I beams parallel to each other. The primary I beams extend past the platform in
front and rear and constitute the only means of attaching the platform to the bogies.
This is done by the use of four heavy fingers, two per bogie, that fit in rectangular
slots in each of the primary I beams. This assembly is secured by large pins
inserted through the slots and fingers. The front bogie attachment to the load platform
is semi-permanent while the rear bogie attachment is removable.
|Front bogie section weight|| ||9,560 lbs|
|Platform||10,850 lbs |
|Rear bogie section weight ||11,400 lbs|
|Ground clearance||1 ft 10 in|
|Ground to platform top ||2 ft 3 in|
|Width from center of tires ||8 ft 3 1/2 in|
|Platform size||19 ft 1 in x 9 ft 10 1/2 in|
|Rear bogie section length ||9 ft 7 in |
|Front bogie section length ||9 ft 9 in |
|Drawbar length||5 ft 4 in|
|Turning radius (using rear steering in addition to drawbar)||58 ft|
There are eight wheels (singles) with size 13.50 x 20 tires. In addition
to these wheels for the running gear there are two spares (same size). All tires
are 16-ply and hold 114 lbs per square inch of air.
(1) Leaf-type springs, one for each wheel, eight in all, having 11 leaves each spring.
(2) Thickness of spring leaves, 3/8-inch.
(3) Length of spring overall, 4 feet.
|GERMAN HEAVY TRANSPORT TRAILER|
c. Maker and Markings
In the trailer which was examined there was a part of an instruction
manual, the text of which indicated that the vehicle was probably built by the
Waggon Maschinen Fabrik at Bautzen, Germany. The figure of a tiger, stenciled
on the trailer, may signify that it was attached to a unit serving the German heavy
tank Pz Kw 6, called the "Tiger".
(1) Markings on the rear of the trailer were:
Vorsicht beim Überholen (Be careful when passing)
Anhängerbreite 3 Meter (Width 3 meters)
Heben (Lifting) Senken (Lowering)
Schnellgang (Fast gear) Normalgang (Normal gear)
Markings on the rear of the fenders were:
Beim Senken Kupplungskopf, 2 Kabelstecker & 2
Stossdämpfergestängebolzen Lösen (Disconnect coupling
head, 2 cable connections, & 2 shock absorber bolts when
(2) Markings on the rear of left cab were:
Vor jedem Senken oder Heben der Ladebrücke ist die Öl pumpe
zu Betätigen & die Zahnflanken des Getriebes im Windenkasten
Einzufetten (Each time before lowering or raising load platform,
lubricate with oil pump and grease gears in winch box.)
(3) Below the above instruction plate were these markings:
Druckschmierung (Pressure lubrication)
(4) Markings on the rear of the front truck were:
Stossdämpfergestängebolzen im Gelände lösen (Disconnect
shock absorber bolts in rough terrain.)
Trailer must first be positioned so that if the vehicle to be loaded is dead,
the winch cable can be used to tow the vehicle on the trailer platform.
Large pins securing the two fingers of the rear bogie section in the
rectangular slots of the primary I beam must be turned past their catches and
Lower the rear of the trailer platform by means of the two hand-driven
winches which are located one on each side of the rear bogie section. These
winches must be turned in the direction marked Senken. When the rear end of
the platform is resting on the ground, pressure is taken off the tongs holding the
platform and they can be released.
When the rear bogie section is free of the trailer the section must be
pushed out of the path of the vehicle to be loaded.
After the vehicle to be loaded is pulled on the platform by means of the
winch of the prime mover, the rear bogie section is repositioned over the rear
of the trailer platform, the lifting tongs are engaged and the two hand winches
are turned in the direction marked Heben. (Note: Although the operation appears
to be quite simple, the actual work involved to prepare the trailer, load the vehicle
and reconnect the platform is a task that took a crew of five experienced men at
least 90 minutes to accomplish.)
(1) Steering is accomplished by means of a drawbar attached to the prime
mover. When aided by rear steering, the turning radius is approximately 50 feet.
All four wheels of the front bogie assembly steer by means of the draw bar. The
linkage is such that the wheels are always tangent to an imaginary circle.
(2) Rear bogie assembly wheels are steered by the trailer driver who
operates a steering wheel. To aid the trailer driver in steering when under full
load, a double-acting air piston is connected with the linkage so that power is
exerted whenever the wheel is turned. All four wheels of the rear bogie steer
differentially so that they are all tangent to the same imaginary circle that the
front bogie wheels are.
(3) The air for steering and for the air brakes is supplied by the towing
vehicle. Provision is made for four air reservoir tanks, one of which is on the
front bogie and is used for the front air brakes. The other three tanks are
positioned on the rear bogie. One of these is used for the rear air brakes; the
other two are used for steering purposes.
(4) The driver on the rear bogie is provided with a steering indicator
dial on the steering wheel column. A small indicator lamp is placed on each
side of the dial. It is considered that these lamps are provided so that the driver
of the prime mover may signal steering instructions to the trailer driver. To the
left of the trailer driver's compartment is a hand wheel that applies the brakes on
the wheels of the rear bogie by means of a worm and gear linkage. This is
probably used only for parking.
(1) This transport trailer can be used to provide a loading ramp for railroad cars.
(2) Its gradual angle of load when the platform is lowered aids in loading.
(3) The rear steering, air boosted, makes this trailer very maneuverable
so that it can negotiate sharp corners on relatively narrow streets. This feature
also makes it very easy to back the trailer.