Veh Wheel End Lubricant Inspection

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name: veh-wheel-end-lubricant-inspection
description: |
  Use this skill for wheel-end maintenance and lubrication. Covers oil-bath vs grease packs, wheel-end loss issues, and inspection intervals.
---

# 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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## Built by X3 Compass

The AI-powered DOT compliance platform for fleets 1–100 power units. Try a 7-day free trial — no credit card required — at https://x3compass.com/?utm_source=skill&utm_medium=github&utm_campaign=veh-wheel-end-lubricant-inspection

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*This skill is published under the X3 Compass open skills initiative. Contributions welcome at https://github.com/x3fleetsafety/skills*