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B&Q£19.64Visit shop B&Q - Replacement 55.5mm Dust Hub Cap Grease Cover For Alko Trailer Drums 4 Pack
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The AB Tools Replacement Dust Hub Cap (55.5mm) is designed for trailer and caravan owners maintaining Alko brake drum systems, specifically models 1637 and 2151. These caps serve as a critical defense against road grime, dust, and moisture that can cause premature bearing failure. While they offer excellent durability due to their steel construction, users must ensure the 55.5mm internal measurement matches their specific hub diameter before purchase to guarantee a proper friction fit.
| Model Part Number | TR246_4PK |
|---|---|
| Brand | AB Tools |
No, it is specifically designed for Alko brake drum models 1637 and 2151 with a 55.5mm diameter.
Measure the inside diameter of the hub bore where the cap seats using a digital caliper.
Yes, using a soft-faced rubber mallet prevents damaging the cap during the installation process.
They can be removed and reused if they maintain their shape, but they are often replaced during bearing service if they become dented.
You should ensure your bearings are properly packed, but you do not need to fill the entire cap with grease.
The zinc plating provides a sacrificial layer that significantly slows down the process of rust and corrosion.
Verify the hub bore is exactly 55.5mm and free of debris. If the cap is loose, the hub bore may have become ovalized from previous damage.
Check that the hub bore is completely clean. If a light tap with a rubber mallet does not seat it, re-measure your hub diameter to ensure it is not smaller than 55.5mm.
While zinc-plated, exposure to harsh road salt can eventually cause surface oxidation. A light coating of automotive wax or anti-corrosion spray can help extend life.
To install, ensure the hub surface is clean of old grease and rust particles. The caps are designed for a press-fit; use a soft-faced rubber mallet to gently tap the outer edges of the cap until it seats flush against the drum. Avoid hitting the center of the cap, as this can cause denting and compromise the internal clearance. Compatibility is limited strictly to Alko trailer brake drums 1637 and 2151 with a 55.5mm bore. For maintenance, periodically inspect the caps for signs of rust or deformation and verify they remain tightly seated after long trips.
