Swing Cylinder Kingpost Bushing 55x60x40mm (fits JCB) - AM 831/10229
High-quality, induction-hardened swing cylinder kingpost bushing (swing cylinder tower bushing) by AM with dimensions of 55 x 60 x 40 mm. This component is designed specifically for the rear arm swing systems of JCB backhoe loaders. This pivot point is subjected to dynamic torsional loads and sudden lateral impacts during operation with a fully loaded attachment. The use of alloy steel guarantees a long service life, eliminates unwanted lateral play on the kingpost, and restores full stability and precision to bucket operation.
Zonal Hardness 54-62 HRC: The bushing undergoes advanced heat treatment, providing the inner and outer working layers with a hardness of up to 62 HRC. This ensures maximum resistance to frictional wear and surface abrasion caused by particles of sand, soil, and operational dust. The ductile and tough core of the component effectively absorbs hydraulic shocks generated when the arm swing movement stops abruptly, protecting the bushing from cracking under load.
Technical Specification:
- Part type: Swing cylinder kingpost / column bushing.
- Quality class: High-quality aftermarket replacement compliant with JCB technological standards.
- Inner diameter: 55 mm.
- Outer diameter: 60 mm.
- Bushing width / height: 40 mm.
- Surface hardness: 54 - 62 HRC (induction hardened).
- Manufacturer/Brand: AM.
Compatibility with JCB Backhoe Loaders:
| Machine Category | Series and Models |
|---|
| Backhoe Loaders |
Series: 3CX, 4CX, 5CX, 3DX, 210/212, 214/215/217, 3/3C/3CS, 4/4C/4CN |
Workshop Tip: Delaying the replacement of worn bushings on the column swing cylinders leads to mounting bore wear (ovalization). A loose pin acts like a hammer on the cylinder eye, causing it to distort. This creates play that can no longer be eliminated with a new bushing alone without costly welding and line boring.
Golden rules for swing cylinder kingpost bushing installation:
1. Always verify pin condition: Installing a new bushing onto an old, worn pin (with a nominal diameter of 55 mm) that has visible ridges, scores, or uneven wear will drastically shorten the lifespan of the new component. Uneven pressure will cause immediate wear of the bushing's working zone.
2. Safe pressing without hammer impact: The induction-hardened layer (up to 62 HRC) has a dense crystalline structure that can micro-crack or chip under a direct strike from a steel hammer (posing a severe injury risk). The bushing should be pressed in using a hydraulic press / screw puller or by using a soft metal drift (brass, copper). A proven method is to cool the bushing in a freezer or dry ice (thermal contraction) to ease its seating into the housing.
3. Initial lubrication and regular maintenance: Before final assembly of the pin connection, thoroughly clean the internal lubrication groove and fill it generously with fresh lithium-calcium grease enriched with molybdenum disulfide (MoS2) or graphite grease. Remember that systematic pressurized lubrication not only reduces friction but primarily flushes out water and dirt, preventing seizures.
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