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Wheel change
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Video Transmission
Video Gearbox-gripes
Video History 1
Video History 2
Video Var. Speed Gearbox 1
Video Var. Speed Gearbox 2
Video Var. Speed Gearbox 3
Video Var. Speed Gearbox 4
Video Var. Speed Gearbox 5
Video Light commercial veh.
Video Shift Possibilities
Video Gearshift Lever
Video Transmission (truck)
Video Ecosplit Gearbox
Video Gearshift (truck) 1
Video Gearshift (truck) 2
Video Truck Multi-axle Gearbox
Video Group/Splitter Gearb.
Video Gearbox Lubrication
Video Axilliary Drive
Video Retarder 1
Video Retarder 2
Video Retarder 3
Video Overdrive
Video Synchronising 1
Video Synchronising 2
Video Two-Shafts Gearbox
Video Gearbox (de)mounting 1
Video Gearbox (de)mounting 2
Video Front - Cross-engine
Video 3 Shafts (not coaxial)
Video Gear Shaft
Video Transmission Design
Video Tractive Power
Video Direct Shift Gearbox 1
Video Direct Shift Gearbox 2
Video Direct Shift Gearbox 3
Video Form. 1 Transmission
Video Motorcycle Gearbox

Video Transmission Ratio
Video Three-shafts Gearbox
Video Two-shafts Gearbox
Video Gear Spreading

Video Manual Gearbox 1
Video Manual Gearbox 2

          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Auxilliary Drive


At the latest, when looking at the gearbox, one can see the multiple demands which can be made on a truck. The ladder extention systems on fire-trucks are spectacular, but also the transportation of liquid cement places high demands on the drive. Compared with these tasks, the almost everyday demands, like the pumping of fuels or heating oil are hardly noticed. This, by the way, is where the RPMs come into play, not only their speed, but also their constancy, demands a lot from the engine.

How it works

To be able to understand the above shown auxilliary drive, the function of the truck gearbox should be quite clear. An important point is, that this is mounted on the output side onto the countershaft. In a gearbox with a pre-selection group, two gear ratios are even possible for the auxilliary drive. The auxilliary drive shown in the above figure even offers the possibility of flanging on two shafts at the same time. For this purpose, a cover which hides the other connection, is found immediately below the uppermost shaft. 12/09               Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

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