3CX, 4CX
The kingpost bush is a key component of the backhoe slew system. Its function is to provide a smooth pivot motion and to bear enormous loads. If you feel excessive play and "clunking" in the kingpost, hear knocking sounds during slewing, and digging is imprecise, these are classic symptoms of a worn bush. Ignoring the problem leads to wear of the bores in the kingpost and frame, which is one of the most expensive repairs on a machine.
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High-Grade Bronze
Resistance to load and seizure
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Precise Dimensions
No play and a perfect fit
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Slew System Protection
Prevents expensive repairs
The accuracy and quality of materials guarantee long and trouble-free use without the need for frequent replacement.
The bushing is fully adapted to work with original pins and seals, ensuring a consistent repair.
The NEXGEN brand is a proven and safe alternative that offers quality comparable to original parts at a much better price.
Kingpost bushes should always be replaced as a complete set (upper and lower). Replacing only one will cause uneven loading and rapid destruction of the new bush.
Installing new bushes on old, worn pins is pointless – the play will return immediately. Always replace bushes together with a new set of pins.
Before installing new bushes, ensure that the bores in the kingpost and frame are not oval. If necessary, they must be repaired (line-bored).
After installation, generously grease the joint through the nipples. Use high-quality grease, such as HYPTRON, and replenish it regularly according to the service intervals.
Answer: The first and easiest symptom to notice is sideways play in the entire backhoe arm, felt when moving it from side to side when it is raised.
Question: Can I replace only the lower bush?Answer: This is highly not recommended. The bushes in a kingpost (upper and lower) wear at a similar rate. Replacing only one will cause the old, worn bush to take more load, leading to rapid failure.
Question: What happens if I operate with a worn bush?Answer: Operating with a loose bush causes wear to the bores in the kingpost and frame. Repairing these elements is one of the most expensive repairs on a machine, many times exceeding the cost of replacing pins and bushes in time.
If you are unsure whether the selected product is suitable for your machine, contact us and we will help you choose the right part and provide practical advice in minutes.
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