5
Installation
5.1
General installation instructions
To fasten the JOST fifth wheel coupling (pursuant to Regulation ECE
R55-01) on the mounting plate or on the auxiliary frame,
at least
8 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 construc-
tion 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 with strength
class 10.9. This also applies to fifth wheel couplings with a D value
of more than 152 kN or an imposed load of more than 20 t.
We recommend that you use JOST fastening kits (see JOST cata-
logue for order numbers).
The pedestals should make contact with the mounting plate over as
wide an area as possible. With undulating mounting plates, it is nec-
essary to have a support in the middle area as well as the contact in
the screw connection area. We recommend securing the pedestals
in the longitudinal and lateral directions and the mounting plates in
the longitudinal direction using pre-welded thrust plates with zero
play. Use the welding methods set out by the manufacturers of the
vehicle and mounting plate for this purpose (see section 5.2).
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 per-
fect friction contact can be generated and maintained at all times.
The bolt connections are therefore to be designed so that the pre-
scribed tightening torque values or pre-stressing forces can be ap-
plied permanently.
The general rule is that the coating thickness of the paintwork
around the securing area of the bolts must be no more than 120 µm
per component.
The bolt connections are to be secured using state-of-the-art meth-
ods to prevent them coming loose.
Appropriate reinforcement must be made in accordance with the ap-
plication. 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 auxiliary frame when the vehicle is being driven. If you
use a different installation method (for example chassis installation),
follow the instructions supplied by the vehicle manufacturer.
ATTENTION!
The fifth wheel coupling must be able to move freely and
must not be in contact with any parts of the frame or flitch
when the vehicle is being driven.
12
MUB 002 004 M01
(REV-C)
04-2019
JSK 36 & JSK 37
JOST IND (REV-A) 06-2019
JSK 39
AIS
091
Directive 94/
ISO3842
ISO
ISO3842
12
10.9
180
28
nos.of M16 bolts,ideally M16*1.5 of strength class 10.9 must be used
Summary of Contents for JSK 39
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