3
Proper usage
3.1
Application
JOST fifth wheel couplings are mechanical connection devices and
establish the connection between the tractor unit and semi-trailer.
They are designed for mounting on a tractor unit.
Fifth wheel couplings, mounting plates and king pins are connecting
parts that must comply with very high safety requirements and must
also undergo design approval tests. Modifications of any kind will
render both the warranty and the design approval void and therefore
also cancel the vehicle's operating licence.
JOST fifth wheel couplings are specified to comply with Regulation
ECE R55-01 Class 50 and are exclusively to be used in combina-
tion with king pins of Class H50 and Class J steering wedges and
mounting plates or with comparable licensed equipment.
JOST fifth wheel couplings are suitable for use with power steering
systems.
ADVICE!
Technical modifications reserved. The latest information
can be found at www.jost-world.com
3.2
Unintended use
The following will be deemed to be unintended use:
Use of king pins which do not comply with the ISO 337 or DIN
74080 standards
Use of defective king pins. Defects may include, for example,
damage to the king pin, incorrect dimensions and installation
on uneven or damaged skid plates
Use with plastic discs mounted on the semi-trailer
Use with an imposed load or D value above the maximum per-
mitted values
Incorrect towing procedures which adversely affect the smooth
functioning of the fifth wheel coupling
Attachment or fastening of lifting equipment
Other applications which do not comply with the manufactur-
er's recommendations
6
MUB 002 004 M01
(REV-C)
04-2019
JSK 36 & JSK 37
JOST IND (REV-A) 06-2019
JSK 39
AIS-091
JOST fifth wheel couplings are specified to comply with regulation
AIS-091-1 Class G50-X and are exclusively to be used in combination
with king pin Class H50-X and Class J non steering wedges and mou-
nting plates or with comparable licenced equipment.
Summary of Contents for JSK 39
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