Wheel-End / Lubricant Inspection

Wheel-ends are a high-risk component. A wheel-off-axle event can be fatal. Inspection and maintenance per § 396.3.

Types of wheel-end design

• Oil bath — wheel hub filled with oil, sealed with O-ring
• Grease packed — hub packed with grease, sealed with bearing dust shield
• Oil-bath with breather — slight ventilation to prevent pressure buildup

What to inspect

• Oil level (oil-bath designs) — usually visible through fill hole or sight glass
• Visible leaks — oil running down rim or onto tire
• Bearing temperature — excessive heat indicates failure
• Wheel play — should be minimal
• Wheel run-out — wobble indicates imbalance or bearing wear

Lubricant interval

• Manufacturer recommendation typically every 50,000-100,000 miles
• Different oils have different lifespans
• Driver should check oil level at every weekly fuel-and-inspection

Wheel-off cases

A wheel-off-axle event is investigated as:

• Manufacturer defect
• Maintenance shortfall (bearing failure)
• Operator error (overtorque, under-torque on lug nuts)
• Overloading

Carrier responsibilities

• Maintenance log per § 396.3
• Track wheel-end lubricant changes
• Lug nut re-torque schedule (typically 50, 200, 500 miles after wheel-off-then-on)
• Annual inspection includes wheel-end check (§ 396.17)

Compass tracking

Compass Vehicles module:

• Tracks wheel-end maintenance events
• Lubricant change scheduling
• Bearing inspection records

CFR citations

• 49 CFR § 393.41
• 49 CFR § 393.43
• 49 CFR § 396.3

How Compass surfaces this

Searchable in Compass Ask. Runs against carrier fleet data when invoked from the relevant tracker. Read-only; no actions without explicit user approval.

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