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Explains the purpose and application of JOST fifth wheel couplings, including compliance with regulations.
Details the technical specifications and calculation formula for the fifth wheel coupling's D value.
Lists common tools required for repair and maintenance tasks.
Identifies specific tools needed for JOST fifth wheel coupling repairs.
Recommends specific lubricants for use during repair and maintenance.
Provides a guide to diagnose and resolve common problems with sensor operation.
Details visual checks and wear dimension measurements for sensors and coupling parts.
Explains how to use a diagnostic tester for sensor checks.
Describes the procedure for measuring contact resistance of wear sensors using a resistance measuring device.
Outlines the steps to test the kingpin sensor's functionality using LED indicators.
Details how to test the semi-trailer detection sensor using its LED indicator.
Steps to disconnect electrical connections and prepare the coupling for removal from the tractor.
Instructions on how to safely remove cable ties securing wiring harnesses.
Step-by-step guide to detach the semi-trailer sensor from the fifth wheel coupling.
Procedure for fitting the new semi-trailer sensor, including component identification.
Instructions for removing the electrical connecting socket from the fifth wheel coupling.
Guide to detach the kingpin sensor, including loosening the grub screw.
Procedure for fitting and correctly adjusting the kingpin sensor.
Steps to remove the locking sensor for JSK 40/JSK 42 models.
Procedure for installing the locking sensor on JSK 42 fifth wheel couplings.
Instructions for removing the locking sensor from JSK 37 fifth wheel couplings.
Guide to fitting a spare part by creating a repair drill hole.
Lists and identifies additional parts required for the locking sensor on JSK 37 models.
Explains the purpose and application of JOST fifth wheel couplings, including compliance with regulations.
Details the technical specifications and calculation formula for the fifth wheel coupling's D value.
Lists common tools required for repair and maintenance tasks.
Identifies specific tools needed for JOST fifth wheel coupling repairs.
Recommends specific lubricants for use during repair and maintenance.
Provides a guide to diagnose and resolve common problems with sensor operation.
Details visual checks and wear dimension measurements for sensors and coupling parts.
Explains how to use a diagnostic tester for sensor checks.
Describes the procedure for measuring contact resistance of wear sensors using a resistance measuring device.
Outlines the steps to test the kingpin sensor's functionality using LED indicators.
Details how to test the semi-trailer detection sensor using its LED indicator.
Steps to disconnect electrical connections and prepare the coupling for removal from the tractor.
Instructions on how to safely remove cable ties securing wiring harnesses.
Step-by-step guide to detach the semi-trailer sensor from the fifth wheel coupling.
Procedure for fitting the new semi-trailer sensor, including component identification.
Instructions for removing the electrical connecting socket from the fifth wheel coupling.
Guide to detach the kingpin sensor, including loosening the grub screw.
Procedure for fitting and correctly adjusting the kingpin sensor.
Steps to remove the locking sensor for JSK 40/JSK 42 models.
Procedure for installing the locking sensor on JSK 42 fifth wheel couplings.
Instructions for removing the locking sensor from JSK 37 fifth wheel couplings.
Guide to fitting a spare part by creating a repair drill hole.
Lists and identifies additional parts required for the locking sensor on JSK 37 models.
This manual describes the repair and maintenance procedures for JOST sensor-enabled fifth wheel couplings, specifically the JSK 37, JSK 40, and JSK 42 Daimler versions. These devices are mechanical connecting components designed to establish a secure link between a tractor unit and a semi-trailer. They are critical vehicle-connecting parts that must adhere to stringent safety requirements and undergo design approval tests.
JOST fifth wheel couplings are equipped with sensors to monitor various aspects of their operation, including locking status, kingpin presence, and semi-trailer detection. These sensors provide feedback to the vehicle's system, ensuring safe and correct coupling. The repair instructions focus on replacing the sensor set, which includes the semi-trailer detection sensor, kingpin sensor, and locking sensor. The system is designed to comply with Directives 94/20/EC and Regulation ECE R55-01 in class 50, and it must be used with kingpins of class H50 and class J mounting plates or comparable licensed equipment. The couplings are also suitable for use in power steering systems.
The load capacity of the fifth wheel couplings and mounting plates is determined by the fifth wheel load (U) and the D-value. The D-value, representing the drawing bar value in kilonewtons (kN), is calculated using the formula:
D = g x (0.6 x T x R) / (T + R - U)
where:
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D = Drawing bar value [kN]g = 9.81 m/s²R = Permissible total weight of the semi-trailer [t]T = Permissible total weight of the towing vehicle, including U [t]U = Permissible fifth wheel load [t]A sample calculation provided in the manual shows:
T = 17 t
R = 33 t
U = 10.5 t
D = 9.81 x (0.6 x 17 x 33) / (17 + 33 - 10.5) kN = 83.6 kN
The wear dimensions for the fifth wheel coupling wear part are specified:
Tightening torques are critical for proper assembly and function:
The sensor-enabled fifth wheel couplings provide real-time feedback on their status. Display symbols and additional text messages guide the operator in identifying issues such as:
These messages prompt the operator to perform checks, clean sensors, or adjust components as necessary. The system ensures that the fifth wheel coupling functions correctly before operation, enhancing safety.
The manual provides detailed instructions for repair work, emphasizing the use of JOST spare parts to maintain warranty and type approval. Key maintenance aspects include:
General| Brand | jost |
|---|---|
| Model | JSK 37 |
| Category | Industrial Equipment |
| Language | English |
