Wheel bearings on HGVs: what to check and when to replace
Wheel bearings on HGVs carry substantial radial and axial loads, particularly on steer axles where cornering forces are highest. The standard fitment on most European HGVs is a pair of tapered roller bearings arranged in opposition, adjusted to a specified preload. Trailer axles increasingly use sealed hub unit assemblies rather than serviceable tapered rollers, particularly on BPW ECO-Plus and equivalent systems.
The first sign of bearing wear is usually a low rumbling or grinding noise from a specific corner that changes in pitch with vehicle speed rather than engine speed. At DVSA annual test, inspectors check wheel bearing play as part of the axle inspection. Always replace the inner and outer bearing as a matched pair.
Frequently Asked Questions
How do I check wheel bearing condition on an HGV?
With the axle raised, grip the wheel at the 12 and 6 o'clock positions and rock it. Any perceptible play beyond the manufacturer's specified tolerance indicates bearing wear. Spinning the wheel by hand and listening for roughness or rumbling is a secondary check. For a definitive preload measurement, use a dial gauge against the hub face as specified in the workshop manual.
What preload should HGV wheel bearings be set to?
Preload specification varies by axle make and type. Typical values are in the range of 0 to 0.05mm axial play for tapered roller bearing arrangements, but always use the chassis manufacturer's specified value. Incorrect preload causes premature bearing failure.
Do I need to replace the bearing seals when I replace the bearings?
Yes. Seals should always be replaced when the hub is removed for bearing replacement. A used seal that is refitted may not seal correctly and will allow lubricant loss and contamination ingress, which will shorten the new bearing's service life.
Are sealed hub units interchangeable with conventional tapered roller bearing setups?
No. The two designs are not interchangeable at the hub level. If your axle uses a conventional tapered roller arrangement, the replacement bearings are tapered rollers with the same specification. Hub unit designs are used on specific axle types and require the complete hub unit replacement.
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