Slurry Pump Bearing Assemblies

Integrated bearing assemblies — supplied as a sealed cartridge that can be handled, stored and fitted as one unit, with grease charge, gland water and axial adjustment all set by frame type.

• Heavy tapered roller and cylindrical roller bearings selected by transmitted power
• Large shaft diameter with short overhang to limit deflection and vibration
• Labyrinth sleeve and ring at both ends keep slurry out of the bearing chamber
• Grease charge 20 g (frame A) to 2,300 g (T/TU pump end)
• Bearing inner ring preheat must not exceed 120 °C
• Grease-lubricated standard; thin-oil-lubricated builds available

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CE · EAC · ISO 9001 · ISO 14001 · ISO 45001

Overview

The bearing assembly carries every load the pump generates. In slurry duty those loads are large, variable and accompanied by an abrasive medium a few millimetres away, so the assembly is built as a sealed cartridge that can be handled, stored and fitted as one unit rather than as loose bearings in a housing.

Assembly Construction

An integrated bearing assembly comprises:

• Bearing housing — the cartridge body locating both bearings.
• Bearings — heavy single- or double-row tapered roller and cylindrical roller types, selected by transmitted power.
• Shaft — large diameter with short overhang so it does not deflect or vibrate under heavy duty.
• End covers — sealed at both ends of the housing.
• Labyrinth sleeve and labyrinth ring — the non-contact seal that keeps slurry and dirt out of the bearing chamber.
• Grease restrictor and grease cup — controlling grease flow and retention.
• Adjusting washer and lock nut — setting and holding bearing position.

Two lubrication builds are offered: grease-lubricated assemblies, which are standard across the horizontal range, and thin-oil-lubricated assemblies for duties where grease service intervals are impractical.

Grease Quantity by Frame Type

Grease charge is set by frame size, and the pump end takes more than the drive end on the larger frames because it sits closer to the medium and to the heat path.

Axial Adjustment by Frame Type

Impeller-to-liner clearance is restored by axial adjustment of the shaft assembly. The adjustment available is a function of frame size:

Shaft Seal Water by Frame Type

Where a packing seal is fitted, the gland water requirement also follows frame size. Undersupplying it is a common cause of premature shaft sleeve and packing wear.

Assembly Discipline

• Bearing inner ring preheat must not exceed 120 °C. Above that the ring loses hardness and the bearing will not reach its rated life.
• The inner ring must be held firmly against the shaft shoulder or the grease retaining ring.
• For double-row tapered roller bearings, inner ring, outer ring and locating parts must be assembled in the correct relative position.
• Shaft sleeve and positioning sleeve must be fitted in the correct position; a reversed sleeve will not seal.

Service Intervals

• Relubricate at 2,000-hour intervals with NLGI #3 grease on submersible builds; regreasing interval on belt- and coupling-driven horizontal pumps depends on bearing speed and frame size.
• Take an oil or grease sample at 2,000-hour intervals to detect bearing or seal wear before failure.
• Reset impeller clearance to 0.5–1 mm at scheduled maintenance, within the axial adjustment available for the frame.
• Monitor bearing temperature; overheating usually traces to too much or too little grease rather than to the bearing itself.

Ordering

Give us the pump model and frame type, the lubrication build now fitted, the drive arrangement and the observed symptom. Frame type is the key identifier — the same assembly serves every pump on that frame. Dimensional data for matching existing installations is available on request.

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