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posted Feb 8, 2010, 12:54 PM by David Wright

Lockout / Tagout: The act of locking out the potential hazard associated with a piece of machinery or area, and tagging the machinery to notify the machine operator that the machine or equipment has been locked out.

Maintenance personnel are required to maintain locks and locking devices for use in lockout / tagout procedures.  The locks used must be unique in both appearance and function.  This means that only the mechanic that owns the lock should have a key to his lock, and the lock must look different from other locks used at the site.  Other forms of lockout include the use of wheel chocks, jack stands, and safety braces under raised blades and raised truck bodies, allowing the engine to cool before working on it, and relieving pressure on hydraulic systems before performing work on the unit.  Tagout devices should be warning tags or steering wheel covers that alert the operator not to use the equipment.

It is illegal for anyone except the mechanic/driver that installed it, to attempt to remove a lockout or tagout device from a piece of equipment.





Lock-out- Physically placing a lock or locking device onto a piece of machinery or equipment to prevent the accidental energizing of said equipment, usually while maintenance is being performed.


Tag-out- Placing a warning tag or steering wheel covers on the locked out equipment to notify others that the equipment is locked out.


Lockout device: a lock used by an authorized employee to disable a piece of machinery or equipment.  This lock must be unique, both in appearance (color) and the keying (each mechanic must have his own lock and key that only his key fits).


Only the employee (or the employee’s immediate supervisor) that installs a lockout device may remove the device.  It is illegal for anyone else to attempt to remove the lock.  This is to protect the mechanic that may be working on the equipment.


Other forms of lockout include, but are not limited to the following:


*Wheel chocks                     *Cylinder braces                  *Vehicle body braces

*Jack stands                         *Allowing time for engine parts to cool


Body / tailgate braces, and wheel chocks are required whenever a vehicle is being worked on in the shop.



1.    Park Truck on level surface

2.    Engage parking break

3.    Turn off Engine

4.    Remove key and put it in your pocket

5.    Kill battery

6.    Notify anyone that may be around your vehicle



            Lockout/Tagout procedures for mechanics must be equipment specific and each employee must be able to show competent knowledge of the procedure for each type of equipment.