jost JSK 34 Setup guide

Replacing the JSK 34
locking sensor
EN Repair instructions
www.jost.world.com
Replacing the JSK 34
locking sensor
EN Repair instructions
www.jost.world.com

Preface
Sensor-enabled fifth wheel couplings are parts that
must comply with very high safety requirements.
This repair manual is designed to act as a guide to
completing repair work on our sensor set.
The use of JOST spare parts is essential. Changes
or modifications of any kind invalidate any warranty
claims and will lead to the component type approval
being forfeited.
Operation and installation are described separately
in dedicated publications.
Explanation of symbols
WARNING!
Means that death, serious physical injury
or significant material damage can occur if
the relevant safety instructions are not fol-
lowed.
ATTENTION!
Means that slight physical injury or mater-
ial damage can occur if the relevant safety
instructions are not followed.
ADVICE!
Contains additional important information.
Contents
1 Safety instructions...................................... 3
2 Intended use................................................ 4
2.1 Use...................................................... 4
3 General......................................................... 5
4 Standard/special tools and auxiliary
materials....................................................... 6
4.1 Standard tools..................................... 6
4.2 Special tools........................................ 6
4.3 Auxiliary materials............................... 6
5 Sensor function test.................................... 7
6 Repair work.................................................. 8
6.1 Preparing the fifth wheel coupling....... 8
6.2 Removing cable fastenings and con-
nectors................................................. 8
6.3 Removing the locking sensor.............. 9
6.4 Removing contacts.............................. 9
6.5 Installation........................................... 10
6.5.1 Installing contacts................ 10
6.5.2 Installing the connector........ 11
7 Disposal instructions.................................. 12
REP 007 005 EN- (REV--) 11/2019 2

1 Safety instructions
The relevant safety regulations in your country (Health & Safety at Work, for example) apply to work with
sensor-enabled fifth wheel couplings and vehicles.
The relevant safety instructions included in the vehicle and semi-trailer's operating instructions must also
be complied with.
The permitted load data and safety information must be complied with during operation and installation.
For maintenance and repair work, the following sections contain safety information that is directly related
to each specific activity. It is essential that you follow this safety information.
REP 007 005 EN- (REV--) 11/2019 3

2 Intended use
2.1 Use
JOST fifth wheel couplings are mechanical connecting devices and establish a connection between the
tractor unit and the semi-trailer. They are designed for mounting on a tractor unit.
Fifth wheel couplings, mounting plates and kingpins are vehicle-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 type approval void and therefore also invalidate the vehicle operating
licence.
JOST fifth wheel couplings are specified to comply with Regulation ECE R55 in class 50 and may be
used solely in conjunction with kingpins of class H50, steering wedges and mounting plates of class J, or
comparable licensed equipment. The sensors conform to Regulation ECE R10.
JOST fifth wheel couplings are suitable for use in power steering systems.
ADVICE!
Technical modifications reserved.
You can find the latest information at www.jost-world.com
REP 007 005 EN- (REV--) 11/2019 4

3 General
Conversion work must be carried out by trained personnel in suitable workshops.
Repair work must be carried out using suitable tools and state of the art methods.
Instructions for assembly are indicated by a diamond (◊).
The assembly is in reverse order if not described separately.
The torque values shown in the illustrations are required for the subsequent assembly process.
Clean all parts thoroughly before assembly.
After completing the repair work, the fifth wheel coupling locking mechanism must be greased and its
function tested.
ATTENTION!
The prescribed tightening torques must be adhered to!
Always replace worn, damaged and cracked parts.
Repair welds must not be used.
REP 007 005 EN- (REV--) 11/2019 5