Lower kingpost bush suitable for JCB 3CX 4CX
GX-AFTER

Lower kingpost bush suitable for JCB 3CX 4CX

Catalog number:808/00301A Nr OEM:808/00301 Manufacturer:GX-AFTER
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LOWER KINGPOST BUSH (BRONZE) SUITABLE FOR JCB 3CX, 4CX - 808/00301

Technical Specification and Compatibility

A high-quality bronze slide bush for the lower kingpost pivot pin. It is a key component of the joint, responsible for ensuring smooth slewing motion of the backhoe arm and for bearing immense forces. The use of bronze guarantees excellent sliding properties and resistance to seizing, which translates to a long service life for the entire joint.

Part number: 808/00301
Inner Diameter (mm): 105
Outer Diameter (mm): 110.5
Height (mm): 64
Material: Bronze

GX-AFTER is the smart choice for your machine. We provide high-class replacement parts that combine excellent quality with an attractive price. Each part is carefully verified to ensure full compatibility and reliability you can depend on.

Essential for Assembly

  • › Kingpost pivot pin: For a complete rebuild of the joint.
  • › Seals and shims: To ensure proper fit and protection of the joint.
  • › HYPTRON high-pressure grease: To protect the pin and bushing from seizing.

Application in machines

Brand (Machine Type) Model
JCB (Backhoe Loaders) 3CX, 4CX (machines with the older rack and pinion slew system, after serial number 405989)

The list above is for reference. Before purchasing, we recommend verifying the part number in the parts catalogue for your machine.

⚠️ Safety Warning

Replacing kingpost bushings requires dismantling heavy arm components. Always secure the arm from falling using the service lock and certified axle stands. Never rely solely on the machine's hydraulics. Use safety glasses and gloves.

Part's Role in the Machine and Failure Diagnostics

The bushing is a sacrificial sliding component that wears out first, protecting the more expensive bores in the kingpost. A worn bushing leads to play, which damages the bores (a "sloppy" joint), which in turn requires a very expensive re-boring repair.

  • › Excessive play (clunking) on the kingpost.
  • › Loss of precision during digging, a "wobbly" bucket.
  • › Loud squeaking or grinding from the joints, even after greasing.
  • › Visible displacement or cracking of the old pin.

Peace of Mind Guarantee: Why Choose Our Offer?

Ignoring play leads to wear in the kingpost bores.

The cost of re-boring worn-out holes is many times greater than the cost of a preventative replacement of pins and bushings. Protect your machine from expensive repairs – order a complete GX-AFTER set and restore the factory rigidity to the joints.

📞 Can't find the part you're looking for?

No problem. Our website shows only a few thousand of the over 60,000 parts we have in stock. Contact us – we probably have what you need on the shelf!

🔧 Expert's Guide: Key Installation Tips

  1. Replace in sets: Always replace the bushing together with the pin and seals to ensure a tight fit and long service life.
  2. Check the bores: Before installation, thoroughly clean and inspect the bores in the kingpost. If they are "sloppy" (oval), they must be re-bored.
  3. Use a press: Always use a press and appropriate sleeves to install bushings to avoid damaging them or the housing.
  4. Grease generously: Before assembly, lubricate the pin and bushing. After assembly, pump in a large amount of fresh grease until it purges out.

Frequently Asked Questions (FAQ)

1. I have play on the backhoe arm. Will replacing this bushing be enough?

Play in the backhoe can come from many places. This bushing eliminates play at the lower kingpost mounting to the carriage. You should also check the upper mounting, bushings, slew ram pins, and wear pads. A comprehensive repair requires assessing and replacing all worn components.

2. Why is this bushing made of bronze?

Bronze has excellent sliding properties and a low coefficient of friction. In case of a temporary lack of lubrication, bronze is more resistant to seizing than steel, which protects the more expensive pin and housing from damage.

3. What happens if I keep working with a worn bushing?

Prolonged operation with a worn bushing causes the bores in the kingpost to wear out. The holes become oval, and their repair is very expensive and requires specialized machining (a mobile line boring machine). In extreme cases, the pin can break, leading to a dangerous failure.

Key Advantages

🛡️

Working Precision

Eliminates play and "rocking" of the arm.

🎯

Machine Protection

Protects expensive components from wear.

📦

High Durability

Bronze resistant to abrasion and seizing.

Question mark

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.

808/00301A
808/00301
0.44 kg

Data sheet

SUITABLE FOR
JCB
MACHINE TYPE
BACKHOE LOADER
OEM NUMBERS
808/00301
MATERIAL
BRONZE
OUTER DIAMETER (MM)
110,5
INNER DIAMETER (MM)
105
HEIGHT (MM)
64
BUSH WITH COLLAR
NO

Specific References

MPN
808/00301
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Lower kingpost bush suitable for JCB 3CX 4CX

Catalog number: 808/00301A
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Manufacturer

  • Serwis Kop Sp. z o.o. Sp. K.
  • Podkarpacka 57a
  • 35-082 Rzeszów
  • Poland
  • [email protected]
  • +48178643100

Responsible person

  • Serwis Kop Sp. z o.o. Sp. K.
  • Podkarpacka 57A
  • 35-082 Rzeszów
  • Poland
  • [email protected]
  • +48178643100
gross price

55.35 zł

net price
45,00 zł
Temporarily unavailable
45,00 zł
net price

55.35 zł

gross price
  • You will receive 5 points, it gives you 2.00 zł
  • Lowest price from 30 days before the discount: 55.35 zł
    PRODUCT SPECIFICATION
    SUITABLE FOR
    JCB
    MACHINE TYPE
    BACKHOE LOADER
    OEM NUMBERS
    808/00301
    MATERIAL
    BRONZE
    OUTER DIAMETER (MM)
    110,5
    INNER DIAMETER (MM)
    105
    HEIGHT (MM)
    64
    BUSH WITH COLLAR
    NO

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    WE OFFER PRODUCTS OF THE BEST BRANDS

    SERWIS KOP Sp. z o.o. Sp.k.
    ul. Podkarpacka 57A, 35-082 Rzeszów
    NIP: 813-352-97-49 REGON: 180286726

    Opening hours
    Telephone support - Monday - Friday (8:00 AM – 5:00 PM)
    Order pick-up - Monday - Friday (8:00 AM – 4:30 PM)

    Email



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    Phone
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    +48 17 864 00 24
    +48 17 864 25 96

    Mobile phone
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    Fax
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