Work instructions only work when they overlap with reality. Crews will follow them when the steps line up with how the machine or asset is built, the order operators move around it, and the pressure of a live shift. The good ones feel like a teammate: clear steps, real photos, callouts for the spots that usually go wrong. The bad ones feel like paperwork written far from the plant.
In heavy industry, working with a solid work instruction template should be standard work - the baseline that keeps crushers running, mixers clean, trucks safe, and audits calm. This guide shows how to write instructions that crews trust and actually can use in the field.
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Procedure vs Work Instruction - What’s the Difference?
A procedure or SOP (Standard Operating Procedure) explains what needs to happen and why - the overall rules, responsibilities, and sequence for a task. It’s the high-level framework. For example, a lockout/tagout SOP tells the whole site how energy isolation must be done, who can apply locks, how verification works, and what documentation is required. Procedures/SOPs usually apply across departments, across shifts, and often across multiple sites.
A work instruction sits underneath that procedure/SOP umbrella and explains how to do the job on the actual machine in front of you. It provides the step-by-step instructions - e.g. torque values, bolt locations, photos, measurements, and the exact order the operator should move through.
Where the SOP sets the standard, the work instruction gives the hands-on walkthrough that makes that standard real. In most plants, the two work together: the SOP defines the rules, and the work instruction makes them practical and repeatable in the field.
Why Most Work Instructions Don’t Get Followed
When a work instruction doesn’t match the job, operators can spot it in seconds. Maybe the photos show a different model of screen. Maybe the steps are listed in a nonsensical sequence. Maybe the language sounds too formal, not the terms that would be used in a plant. Once trust in the instruction process is broken, crews default to memory or shortcuts - not because they want to, but because the document slows them down.
Common reasons instructions fall apart in the field include:
- They’re written separately from the equipment. Steps don’t match the actual walk-around path or the way guards open.
- They assume ideal conditions. Real shifts can have mud, dust, wear, time pressure, and other constraints that can cause a spanner in the works, which the document ignores.
- They’re too long or too vague. Operators don’t have time for paragraphs. They need crisp, numbered steps.
- They’re outdated. Equipment gets swapped, retrofitted, or relocated, but the instruction stays the same.
How to Write Work Instructions
Writing work instructions starts with the job itself. Go to the machine, follow the path an operator takes, and build the steps in that same order, preferably together with an actual operator. Keep each line short and action-focused so the flow is easy to follow. Use clear photos from the actual equipment, not generic images, and only include the details that matter - e.g. torque values, lockout points, grease types, measurements, and any “red-state” conditions that should stop the job.
Good work instructions make the safest, most reliable way to do the task obvious, even for operators with mixed experience levels. That means matching the real sequence of the job, calling out hazards at the right moment, and ending with a simple picture of what “done” looks like.
Work Instruction Template
Below is a work instruction template for a jaw crusher cheek plate replacement for a sample machine we will call “JC-204”. As you will see, work instructions do not need to be overly complex, even if the procedure itself may be complex - rather the opposite. The easier and clearer they are the better, but the most important part is to adapt them to the actual individuals who will be performing the actual repair.
Always involve the operators themselves in the process of creating a work instruction to ensure they are not overly complex and get the instructions across in a logical and easy to understand way.
Section
Details
Document name
Work Instruction - Jaw Crusher Cheek Plate Replacement (JC-204)
Task purpose
Replace worn cheek plates on jaw crusher JC-204 to restore proper crushing performance and prevent uneven wear.
Safety preparation
- Lockout/Tagout: Isolate power at MCC-3, Breaker CRSH-P1.
- Stored Energy: Bleed hydraulic tension cylinder.
- PPE: Hard hat, gloves, safety glasses, steel toes, hearing protection.
- Hazards: Pinch points around pitman, suspended loads, dust.
Tools & parts needed
- 40 mm & 46 mm sockets
- Torque wrench (1,000 Nm capacity)
- Come-along (2-ton)
- Anti-seize compound
- New cheek plates: CP-J204-L & CP-J204-R
Pre-checks
- Confirm correct unit: RFID tag on right frame beam.
- Scalper feed locked out.
- Walkway and handrails are secure.
- Inspect chamber for material buildup.
Step-by-step instructions
A. Remove Old Plates
- Apply penetrating oil to plate bolts.
- Support plate with come-along.
- Remove four mounting bolts.
- Guide plate out of chamber and lower safely.
Stop work if: Mounting surface shows cracks or deformation > 5 mm.
B. Install New Plates
- Match “L” and “R” markings.
- Apply anti-seize to bolts.
- Lift plate into position using come-along.
- Hand-tighten bolts.
- Torque to 850 Nm in cross pattern.
C. Tension Rod Check
- Inspect bushings; replace if wear > 2 mm.
- Torque tension nuts to 350 Nm.
- Verify jaw gap is 85 mm ± 3 mm.
Restart & verification
- Reinstall all guards.
- Clear tools/materials from the walkway.
- Remove LOTO and request a control-room jog.
- Run empty 30 seconds; listen for noise/vibration.
- Resume feed and monitor for the first 5 minutes.
What “done” looks like
- Both cheek plates are fully seated and torqued to spec.
- Jaw gap confirmed within tolerance.
- No unusual vibration, noise, or heat increase.
- All guards installed and the area clean.
- Insert images to support above.
Documentation
Log work under WO# 25749-JC204, attach before/after photos, and note torque values.
OBSERVE! The above work instruction template is just one example of how they could look, and you should write your own based on company policies and guidelines.
Are Work Instructions a Controlled Document?
Yes - in most plants, quarries, or similar, work instructions are treated as controlled documents because they guide tasks that affect safety, compliance, and equipment integrity. A controlled document is one where the version matters. If operators follow an old set of steps or torque values, the job can go wrong fast. That’s why controlled documents are managed with clear version history, approvals, and update rules.
For work instructions, control usually means three things:
- First, only approved versions are allowed in circulation - old copies are removed from binders, tablets, and shared drives.
- Second, updates follow a formal review path involving maintenance, safety, and sometimes operations, so the content reflects the real machine and current standards.
- Third, ownership is defined: someone is responsible for keeping the instruction accurate when equipment is rebuilt, relocated, or modified.
How to Make Your Work Instructions Work in the Real World
Printed binders and static PDFs usually fail after the first revision. Updated steps, revised safety notes, or similar rarely, or never, make it back into the old copies. Digital work instructions that open on a phone or tablet, link directly to checklists, or launch with a quick scan at the machine turn instructions into something people actually use on every shift.
When operators can pull up the right instruction with one tap, follow the steps in order, add a photo, and sign off when they’re done, consistency takes care of itself. Supervisors get visibility without chasing paperwork, and audits stop being a scramble for proof. Simple access, clear steps, and traceable completion - that’s how a work instruction becomes real standard work.
The simple solution: a maintenance management platform, where everything can be stored in one and the same place, from checklists and schedules, to planning and deviations reporting.
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