# MACHINERY
> MSHA accident `220040840004` · 03/09/2004 · Luck Stone Corporation
## Details
- **Degree of injury:** DAYS AWAY FROM WORK ONLY
- **Classification:** MACHINERY
- **Accident type:** Over-exertion NEC
- **Occupation:** Maintenance man, Mechanic,  Repair/Serviceman, Boilermaker, Fueler, Tire tech, Field service tech
- **Activity:** Hand tools (powered)
- **Injury source:** HAND TOOLS,POWERED,NEC
- **Nature of injury:** SPRAIN,STRAIN RUPT DISC
- **Body part:** BACK (MUSCLES/SPINE/S-CORD/TAILBONE)
- **Days lost:** 320
- **Mine experience:** 2.54 years
## Operator
- **Controller:** Charles S  Luck IV
- **Operator:** Luck Stone Corporation
- **Mine:** [3102167](https://api.ai-analytics.org/mine/3102167)
## Narrative

Associate removing tracks with 1"" impact wrench, associate did not use standard procedure of blocking track from moving, when removing last bolt, track shifted jerking impact wrench out of hand and straining back

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*Source: [MSHA Open Government Data](https://arlweb.msha.gov/OpenGovernmentData/) · AI Analytics · CC0 1.0*