jost JSK Series User Manual (English)

Questions and Answers:

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Robin RoblesJul 27, 2025
What to do if jost JSK Accessories display is non-functional after starting?
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  Roy SmithJul 27, 2025
  If the Jost Accessories display is non-functional after starting, there are several potential causes. First, check the plug connections for the cabling between the fifth wheel coupling and the electronic display, ensuring all contacts are uniformly engaged and correctly connected. Also, inspect the 1 A automotive fuse and replace it if defective. Next, verify the voltage supply to the connection cable: the white cable should be connected to terminal 15 (+12 V or +24 V ignition ON), and the black cable to terminal 31 (earth). Finally, check the vehicle battery and charge or replace it if it's too weak.
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dawnowensAug 1, 2025
Why does the jost JSK Accessories indicator change when driving?
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  Dylan BlackAug 1, 2025
  If the indicator on the Jost Accessories display changes while driving or after ignition is on with a coupled semi-trailer, it could be due to several reasons. The fifth wheel coupling may not be adjusted correctly or could be worn, so check and adjust it according to its installation and operating instructions. Also, the king pin might be worn beyond its maximum wear limit, requiring replacement, and the locking mechanism setting on the fifth wheel coupling should be checked. Ensure the king pin sensor is correctly installed according to the sensor system repair instructions. Lastly, check the plug connections for the cabling between the fifth wheel coupling and the electronic display to ensure they are correctly engaged.
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Emma GriffinAug 5, 2025
What to do if jost JSK display does not switch off after uncoupling?
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  Mrs. Katherine PhamAug 5, 2025
  If the Jost Accessories display does not switch off after uncoupling, the king pin sensor and/or semi-trailer sensor might be soiled by grease or other dirt, so clean them. Alternatively, the sensor set may be defective due to a cable break or sensor issue. In this case, check the sensor set according to the repair instructions “Replacing the sensor set” and replace it if necessary.
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brianhernandezAug 8, 2025
What to do if jost JSK Accessories fifth wheel coupling is not closed correctly?
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  Natalie HollandAug 8, 2025
  Check the status of the locking mechanism, adjust it if necessary, and reconnect the semi-trailer.
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Brian ThomasAug 13, 2025
What happens if jost JSK Accessories fifth wheel coupling has been locked manually without the king pin?
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  williamsonsarahAug 13, 2025
  Open the fifth wheel coupling and reconnect the semi-trailer if necessary. The skid plate must rest on the fifth wheel coupling without a gap.
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Priscilla WilsonAug 17, 2025
What to do if jost JSK 42 Accessories handle is not secured?
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  David HollandAug 17, 2025
  Check the functionality of the handle. If necessary, clean and re-lubricate it. The handle must move independently and fully into the secured position.
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Christina PhelpsAug 22, 2025
What to do if jost JSK Accessories semi-trailer sensor is defective?
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  Tracy PierceAug 22, 2025
  Check the functionality of the king pin sensor and semi-trailer sensor according to the repair instructions “Replacing the sensor set” and replace the sensor set if necessary.