Krupp KB gyratory crusher parts

Outer and inner bushings for Krupp KB series gyratory crushers

For KB 54-67, KB 54-75, KB 63-75, KB 63-89, KB 63-114. Manufactured to original ThyssenKrupp drawings and specifications.

Outer bushing (eccentric bushing)

Centrifugally cast leaded bronze — C93800 / CuPb15Sn7. Guides main shaft eccentric motion. Machined to OEM bore and OD tolerances on CNC lathes.

Lubrication: Oil circulation system — continuous pressurized feed through the crusher's central oil gallery.

Inner bushing (spider bushing)

Located in the spider assembly. Supports the main shaft upper end and absorbs radial + axial loads. Same bronze grade as outer bushing — centrifugally cast, precision bored.

Lubrication: Grease-lubricated through the spider cap grease fitting. Inspect every 200 operating hours.

Manufacturing

Bushings are cast and machined in-house. Each bushing is checked against the original Krupp drawing before shipment — bore diameter, wall thickness, oil groove geometry.

Typical service life: 8,000–15,000 hours depending on feed conditions and lubrication discipline. Stock available for common KB models.

Send your part number or machine serial — we'll confirm fitment from the Krupp parts book.

FAQ — Krupp gyratory crusher bushings

How long do Krupp gyratory bushings last?

Outer (eccentric) bushing: typically 8,000–15,000 hours. Inner (spider) bushing: 10,000–18,000 hours. Service life depends on lubrication discipline — a missed grease interval on the spider bushing can cut life by 50%. Oil analysis every 500 hours is recommended for eccentric bushing health monitoring.

What are the signs that bushings need replacement?

Increased main shaft runout (measured at the spider). Rising oil temperature in the eccentric circuit. Bronze particles in the oil filter — send oil samples for spectrometric analysis. Audible knocking during operation indicates severe wear — stop and inspect immediately.

Do you supply complete bushing kits?

Yes — outer bushing, inner bushing, and all associated seals and O-rings as a complete kit. We also stock individual bushings for partial rebuilds. Oil groove geometry matches original Krupp drawings.