A high-quality slide bush, made of a special bronze alloy. It is a key component of the joint connecting the kingpost to the sideshift carriage at its lower mounting point. Its function is to provide smooth rotational movement for the kingpost pin and to bear the enormous forces generated during backhoe operation. It has internal grease channels for optimal lubricant distribution.
A CORESPEX brand product – premium quality replacements that guarantee long life and reliability, even when working in heavy-duty conditions.
| Brand (Machine Type) | Model |
|---|---|
| JCB (Backhoe Loaders) | 3CX, 4CX (models up to serial number 405988) |
The list above is for reference. It is crucial to ensure that your machine has the older sideshift type with a rack and pinion slew mechanism.
Replacing kingpost bushings requires the backhoe arm to be immobilized and secured. Always use the service lock and certified axle stands. Never rely solely on the machine's hydraulics. Use safety glasses and gloves.
For a complete joint refurbishment, always replace the upper and lower bushings together with new pins and seals. Regular greasing of the kingpost with high-quality HYPTRON grease with MoS2 additive drastically extends the life of all moving parts.
Bushings are sacrificial components designed to wear out to protect much more expensive parts like the kingpost or the sideshift carriage. Ignoring worn bushings leads to play, which in turn damages the pin bores (causing them to become oval), ultimately requiring a very expensive re-boring repair.
Replace the bushings if you notice:
Ignoring play on the pins leads to irreversible damage to the bores in the carriage and kingpost, forcing costly re-boring repairs.
A repair performed using a complete set of CORESPEX pins and bushings is the cheapest way to avoid these problems. Secure your machine and restore its factory precision – order a complete set today.
Copper alloys (bronze) are used in very high-load, low-speed joints. These materials have excellent sliding properties and are more resistant to seizure in the event of a temporary lack of lubrication than a steel bush, which is crucial in such an important component as the backhoe slew.
2. I have play on the backhoe arm. Will replacing this bush be enough?Play in the backhoe can come from many places. This bush eliminates play at the lower kingpost mounting to the carriage. You should also check the upper kingpost mounting, the slew ram pins, and the pin connecting the boom to the kingpost. A comprehensive repair requires replacing all worn bushings and pins.
3. How do I distinguish the "old type" of slew from the new one?The "old type" of slew, used up to approx. 1991 (serial number 405988), is based on two hydraulic rams and a rack and pinion system. Newer machines use a slew ring system (like in large excavators), which has a completely different kingpost and carriage design.
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Working Precision
Eliminates play and restores arm rigidity.
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Machine Protection
Protects expensive components from wear.
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High Durability
Bronze resistant to abrasion and seizure.
Have doubts or need confirmation to avoid costly downtime? Call us. Our experts will help you choose the right part to get your equipment back to work as soon as possible.
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