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Free course · Intermediate · 4 h 58 min · v1.0

Industrial Maintenance Fundamentals

The safety side of maintenance work — hazardous energy, guards, permits and return to service, free and self-paced

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This course is step 1 of 3 in the Industrial Mechanic — Learning Path, which puts the free courses on this site in a reading order.
Not OSHA-authorized training. This free course is a study aid. It does not satisfy any OSHA or regulatory training requirement and no certificate or card is issued. Your employer's training program comes first.

Production runs a machine the way it was designed to be run. Maintenance goes inside it. That is the whole difference, and it is why 29 CFR 1910.147 exists at all: the standard covers servicing and maintenance "in which the unexpected energization or start up of the machines or equipment, or release of stored energy could cause injury." This free, self-paced course is about the safety half of the maintenance trade — the energies you have to find and kill, the proof that they are dead, the guards you are the only trade paid to remove, the height and the atmosphere and the heat that come with the work, and the paperwork and the return-to-service steps that decide whether the next shift lives. Every requirement is quoted with the paragraph it comes from, and seven of the incidents in it are OSHA's own fatality reports.

What you will be able to do

  • Explain why maintenance work sits outside normal production operations, and name the two conditions in 1910.147(a)(2)(ii) that pull a task performed during production back under the standard
  • Find the six energy types and the stored energy in a machine before you shut it down, and say which devices are energy isolating devices and which are only controls
  • Run the six steps of 1910.147(d) in the order they are written, and prove deenergization instead of assuming it
  • Say why electrical work follows 1910.333(b) rather than 1910.147, and what that changes about locks, tags and testing
  • Judge a guard, a shaft, a bench grinder and a power press against the paragraph that governs it, and use the five-step sequence for the moments the machine has to run
  • Recognize the height, atmosphere and hot work hazards that maintenance creates for itself, and the permits that go with each
  • Put a machine back the way you found it — guards on, devices live, openings closed, parts equivalent — and know which changes are not "replacement in kind"

Course outline

Part 1

The maintenance job and the risks that belong to it

Why servicing a machine is not operating it, the six kinds of energy a plant holds, the words the standards use for you, and the walk you take before you pick up a wrench.

  1. 1.1 Why maintenance work is not production work13 min
  2. 1.2 The energies in a plant, and where each one hides13 min
  3. 1.3 Authorized, affected, qualified: who you are in the standard's own words12 min
  4. 1.4 The pre-job walk: what to know before you touch anything13 min
  5. Part 1 quiz5 questions
Part 2

Isolating the energy, and proving it is gone

The six steps of 1910.147(d) in order, the stored energy that kills after the power is off, verification as a test rather than a belief, and why electrical work follows a different paragraph.

  1. 2.1 The six steps of 1910.147(d), in the order they are written14 min
  2. 2.2 Stored and residual energy: what kills after the power is off13 min
  3. 2.3 Verification: the step that is not a formality14 min
  4. 2.4 Electrical work has its own lockout rule14 min
  5. Part 2 quiz5 questions
Part 3

Guards, moving parts and the machines maintenance touches

What a guard is for and why maintenance is the trade that removes them, the power-transmission paragraphs nobody reads, the shop's own machines, and the five-step sequence for when the machine has to run.

  1. 3.1 What a guard is for, and who takes it off13 min
  2. 3.2 Shafts, belts, sprockets and the 60-day rule13 min
  3. 3.3 The maintenance shop's own machines13 min
  4. 3.4 When the machine has to run: testing and positioning14 min
  5. Part 3 quiz5 questions
Part 4

Height, atmosphere and heat

The jobs maintenance ends up doing on top of the repair: climbing on somebody else's equipment, opening a vessel, welding on a machine that used to hold something, and breathing what the work gives off.

  1. 4.1 Working at height on somebody else's equipment13 min
  2. 4.2 Confined spaces, including the ones you create yourself13 min
  3. 4.3 Hot work: the 35 feet, the watch and the permit14 min
  4. 4.4 What the work gives off: fume, solvent and exhaust12 min
  5. Part 4 quiz5 questions
Part 5

Procedures, records and putting it back

The written procedure as part of the tool kit, the records that are actually required, working as a crew and across shifts and companies, and the return to service that decides whether the next operator is safe.

  1. 5.1 The written procedure is part of the tool kit13 min
  2. 5.2 The records that are actually required13 min
  3. 5.3 Crews, shift changes and contractors12 min
  4. 5.4 Return to service, and the change you did not declare14 min
  5. Part 5 quiz5 questions
Final exam
20 questions · about 20 minutes
Go to the exam

Who it's for: Maintenance technicians and millwrights, industrial mechanics and electricians, plant and facility engineers, reliability and PM planners, production supervisors who release equipment to maintenance, EHS staff, and contractors who service somebody else's machines.

Frequently asked questions

No. Under 29 CFR 1910.147(c)(8), lockout or tagout is performed only by the authorized employees performing the servicing or maintenance, and (c)(7)(i)(A) puts the training on your employer: the hazardous energy sources in your workplace, the type and magnitude of the energy available, and the means of isolation for the machines you actually work on. Those things are machine-specific and site-specific. This course teaches you what the standard requires and what a good procedure looks like, so that the training your employer owes you lands on something.

No. Nothing is issued. SteelToeTools is not affiliated with, endorsed by or authorized by OSHA or the U.S. Department of Labor, and this free content does not satisfy any regulatory training requirement. Only OSHA-authorized trainers deliver OSHA Outreach Training and issue DOL cards.

Part 2 is, and it goes deep — but the course is wider than that. Maintenance work also removes guards, climbs on equipment, opens vessels, welds, and hands machines back to production, and each of those has its own paragraph. If you only want hazardous energy, the Lockout/Tagout Fundamentals course on this site covers 1910.147 on its own; this one puts it in the middle of the trade it belongs to.

Because those values live in copyrighted consensus standards — Machinery's Handbook and SAE for fasteners, ASME B30 for rigging, NFPA 70E for arc flash — and OSHA references them rather than reprinting them. The course explains what each value is for and where the one that applies to your equipment comes from: the manufacturer's manual, the equipment nameplate, and your plant's own engineering documents.

Only by comparison. 29 CFR 1910.147(a)(1)(ii)(A) excludes construction and agriculture from the general industry hazardous energy standard, and construction gets 1926.417 and 1926.702(j) instead, which are much shorter. This course is written for general industry — plants, mills, warehouses and facilities — and it flags the places where a construction site would work under a different paragraph.

Both, and more often a requirement than people expect. 29 CFR 1910.219(p)(1) sets a 60-day inspection interval for all power-transmission equipment; 1910.217(e)(1)(ii)(A) requires a weekly test of a press clutch/brake, antirepeat and single-stroke mechanism; 1910.179(l)(1) requires a preventive maintenance program based on the crane manufacturer's recommendations; and 1910.119(j) requires written procedures, trained people, documented inspections and corrected deficiencies for covered process equipment. Part 5 works through what each one actually asks for.

It is the difference between putting the lock on and living with it. 1910.147(b) defines an authorized employee as the person who locks out or tags out the machine in order to perform the servicing or maintenance, and an affected employee as someone whose job requires operating that machine or working in the area where the servicing is happening. Affected employees have to be instructed in the purpose and use of the procedure — 1910.147(c)(7)(i)(B) — and notified before the devices go on and after they come off, under (c)(9). An affected employee becomes an authorized employee when their duties include the servicing itself.

Read 1910.147(b) and the note to (a)(2)(ii) together, in that order. The definition of servicing and maintenance explicitly includes "lubrication, cleaning or unjamming of machines or equipment and making adjustments or tool changes" where the employee may be exposed to unexpected energization. The exception is narrow: minor tool changes and adjustments during normal production operations are outside the standard only if they are routine, repetitive and integral to production and the work is performed using alternative measures that provide effective protection. Three of the seven fatalities cited in this course happened while somebody cleared a jam or cleaned under a running machine.

Sources & references

Content checked against these sources — last reviewed September 2, 2026.

Not OSHA-authorized training. SteelToeTools is not affiliated with, endorsed by, or authorized by OSHA or the U.S. Department of Labor. This free educational content does not satisfy any OSHA or other regulatory training requirement, and no card, certificate, or credential is issued. Only OSHA-authorized trainers can deliver OSHA Outreach Training (10-Hour and 30-Hour) and issue DOL cards. Always follow your employer's training program and applicable federal, state, and local requirements.

By — Editorial team of SteelToeTools.com (published by LSEA SAS) Updated v1.0