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4 Assembly
4.1
General assembly instructions
To secure the JOST fifth wheel coupling (pursuant to Directive 94/20/EC and
ISO 3842 / DIN 74081) on the mounting plate or on the flitch, at least eight
M16 bolts, ideally M16 x 1.5 of strength class 8.8 must be used.
These must be positioned in a symmetrical pattern to the longitudinal and
lateral axes of the fifth wheel coupling.
If the coupling is used in harsh conditions (for example on construction sites),
with trailers with forced steering or with trailers that use the full D value and/or
imposed load, we recommend that you use all 12 bolts.
Fifth wheel couplings with a design height of over 250 mm and a D value of
over 133 kN must be secured with 12 bolts.
We recommend that you use JOST mounting kits (see JOST catalogue for
order numbers).
We recommend securing the pedestals in the longitudinal and lateral
directions and the mounting plates in the longitudinal direction by prewelded
thrust plates. Use the welding methods set out by the manufacturers of the
vehicle and mounting plate for this purpose.
There is no need to use thrust plates, however, if it can be ensured that the
correct tightening torque for the bolts and therefore the perfect friction contact
can be generated and maintained at all times. The bolt connections are
therefore to be designed so that the prescribed tightening torque values or
prestressing forces can be applied permanently. The general rule is that the
coating thickness of the paintwork around the securing area of the bolts must
be no more than 170 μm per component. The bolt connections are to be
secured using state of the art methods to prevent them coming loose.
Appropriate reinforcement must be made in accordance with the application.
The fifth wheel coupling must be able to move freely and must not be in
contact with either the mounting plate or parts of the chassis or flitch when the
vehicle is being driven.
If you use a different installation method (for example chassis installed), follow
the instructions supplied by the vehicle manufacturer.
4.2
To install the fifth wheel coupling
1
Fifth wheel coupling
2
Mounting plate
3
Thrust plate to secure the pedestals
4
Thrust plate to secure the mounting plate
5
Vehicle chassis
6
Flitch
7
Hexagonal bolt DIN EN 28765/28676 (DIN 960/961) M16 x 1.5-8.8
8
Washer 17 DIN 7349 6 thick (min. HB150)
9
Optional washer (min. HB150) or disc spring
10
Hexagonal nut DIN 980 M16 x 1.5-8.8 or M20 x 1.5-8.8
11
Hexagonal bolt DIN EN 28765/28676 (DIN 960/961)
M16 x 1.5-8.8 or M20 x 1.5-8.8
12
Optional washer/disc spring
Tightening torque, see section 5.
JSK 37C / 37CX
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