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Mechanical Sealing

The internals of the Rockstar are fully protected by an advanced sealing arrangement, comprising upper and lower piston rings and twin banks of upper and lower replaceable labyrinth seals

All Roller Bearing Construction

The Rockstar is equipped with a proven combination of Taper and radial roller bearings. These provide long trouble free service, and minimise friction losses. Utilising these generously proportioned heavy duty bearings also eliminates the need for a large oil tank and ensures consistently accurate alignment of gears, sealing rings and the crushing members themselves.

Concave Support Bowl

The cast steel concave support bowl is accurately machined to support the concave ring and is shaped to receive a plastic metal backing for the crushing member. Is lower face is provided with a machined tapered face to form a locked engagement with the upper frame.

Eccentric

The eccentric is steel casting machined on special fixtures to achieve the optimised throw to maximise production and product shape. The unit is jig drilled to accommodate the rotary seal ring and gear.

Cone head

The cast steel cone head in machined internally to accept a large capacity taper roller bearing, and a top radial roller bearing. Externally the lower section is machined to accept the mantle and shaped to allow plastic metal backing to be poured behind the mantle during re-metals.

Mantle and Concave

Both mantle and concave are cast from high grade manganese steel. The both parts are machined to ensure accurate location in their mating parts.

Gear and Pinion

The machine cut bevel gear and pinion are manufactured form alloy steel forgings, the teeth of both components are induction hardened to ensure long life. The pinion is located on the counter shaft by a special locking ring, and the gear is keyed and capscrewed to the eccentric.