A stationary chassis can still move its blade and articulation joint. Survey entry is a separate controlled phase: stop the relevant movements, confirm the operator and surveyor agree on the safe state, then account for every person before readjusting.
This reference material was written and revised with AI. It has not been verified or approved by a professional. Review by a suitably qualified professional and required site approval are necessary before field use.
Stop before proceeding
Stop travel and cutting for a blade impact, sudden resistance increase, ground settlement, lost signals or an unaccounted surveyor. Do not resume until the cause and the full swept-path exclusion are resolved.
1. Legal and technical scope
Construction earthmoving provisions in 1926.602 address graders, access grades, braking and reverse operations. Apply 1926.600 to equipment, lowering/blocking and parking as applicable. Review required rollover protection under Subpart W for the actual equipment. Operating slope, articulation, blade angle and cut depth remain model- and ground-specific; no universal value is supplied.
Confirm whether federal OSHA or an OSHA-approved State Plan covers this employer and worksite; state requirements and public-sector coverage can differ. Apply the task-specific provisions and limitations identified above.
| Basis | Application |
|---|---|
| OSHA 29 CFR 1926.602 | Construction earthmoving equipment, graders, access grades, brakes and obstructed rear-view conditions. |
| OSHA 29 CFR 1926.600 | Construction equipment movement, servicing supports and parking controls. |
| OSHA State Plans | Official overview of federal and State Plan jurisdiction and differing public-sector coverage, checked 2026-10-12. Individual state rules require a site-specific check. |
2. Scope and required inputs
Included scope
Grade a planned roadbed using controlled cutting passes, reverse/turn transitions and separate survey or inspection access, followed by parking and handoff.
Separate assessment
Steep-slope pioneering, snow clearing, towing, underground utility removal and blade replacement beyond the controlled maintenance plan are separate tasks.
| Input | Evidence needed |
|---|---|
| Review roadbed | Ground and edge condition; Utility record; Design profile and depth; Existing roadbed. |
| Inspect grader | Brakes and controls; Blade condition; Leaks and articulation; Tires and operator protection. |
| Cut and shape | Resistance changes; Utility and material; Depth and position; Edge support. |
| Inspect and park | Surveyed section; Drainage and edge limits; Parking state; Receiver and open defects. |
No site measurements, equipment manuals for the actual installation, inspection records or signed technical approvals were supplied. Confirm the applicable requirements and actual product instructions before use; record each criterion with its units, source and equipment or work-area ID.
3. Eight-stage JSA
| Job stage | Hazards and effects | Failure factors | Technical and procedural controls | Site verification | P | S | R | A |
|---|---|---|---|---|---|---|---|---|
| 1. Review roadbed | 1. Ground settlement2. Utility strike3. Wrong cut depth4. Poor drainage | 1. Bearing unknown2. Service not located3. Datum mistaken4. Existing defects missed | 1. Assess ground support2. Locate utilities3. Confirm survey datum4. Plan drainage and stages | 1. Ground and edge condition2. Utility record3. Design profile and depth4. Existing roadbed | ||||
| 2. Separate survey | 1. Surveyor struck2. Traffic collision3. Blade contact4. Hidden person | 1. Shared work phase2. Signals conflict3. Chassis-only stop4. No exit confirmation | 1. Separate survey and travel2. Control traffic3. Stop blade movement4. Confirm entry and exit | 1. Surveyor location2. Traffic boundaries3. Blade and articulation4. Operator contact | ||||
| 3. Inspect grader | 1. Brake failure2. Blade release3. Steering loss4. Tire support failure | 1. Brake defect2. Loose cutting edge3. Hydraulic fault4. Damaged tire | 1. Check brakes and alarm2. Inspect blade fasteners3. Check steering and hydraulics4. Correct tire defects | 1. Brakes and controls2. Blade condition3. Leaks and articulation4. Tires and operator protection | ||||
| 4. Enter and trial | 1. Blade hits structure2. Ground yields3. Excessive depth4. Person in swept path | 1. Projection missed2. Weak test area3. Wrong elevation4. Boundary too narrow | 1. Check full swept path2. Use planned trial section3. Verify trial elevation4. Maintain exclusion | 1. Blade-end clearance2. Trial ground response3. Measured trial level4. People and signals | ||||
| 5. Cut and shape | 1. Lateral slide2. Utility damage3. Machine overturn4. Blade overload | 1. High side resistance2. Hidden obstruction3. Weak edge4. Forced snag removal | 1. Follow planned cut2. Stop abnormal resistance3. Monitor machine attitude4. Investigate obstruction | 1. Resistance changes2. Utility and material3. Depth and position4. Edge support | ||||
| 6. Reverse and survey | 1. Reverse collision2. Cross-slope overturn3. Blade contact4. Articulation crush | 1. Rear view obstructed2. Abrupt turn3. Survey during adjustment4. Joint zone ignored | 1. Use required reverse controls2. Check turn conditions3. Stabilize before entry4. Exclude articulation zone | 1. Rear path and signal2. Slope and wheel position3. Survey phase clearance4. Full swept envelope | ||||
| 7. Service safely | 1. Blade drops2. Joint crush3. Pressure release4. Machine movement | 1. Hydraulic support only2. Early approach3. Residual pressure4. Parking unsecured | 1. Stop and isolate2. Use specified supports3. Control stored pressure4. Prevent vehicle movement | 1. Mechanical support2. Energy state3. Tools and technician4. Maintenance boundary | ||||
| 8. Inspect and park | 1. Next vehicle overturns2. Parked grader moves3. Drainage edge fall4. Unfinished area entered | 1. Defect unmarked2. Blade raised3. No survey record4. Barrier removed early | 1. Check profile and drainage2. Lower attachments and secure3. Mark unfinished sections4. Transfer restrictions | 1. Surveyed section2. Drainage and edge limits3. Parking state4. Receiver and open defects |
P = likelihood; S = severity; R = risk under the site method; A = the site-defined acceptance/authorization decision. Complete only after actual assessment. Blank cells and checklist prompts are not completed inspections.
4. Fictional scenario and failure mechanisms
Retained AI-generated educational illustration from the source edition; not a real incident photograph, approved installation drawing or evidence of equipment suitability.
The scenario and record comparisons are fictional teaching examples, not records of real incidents, measurements, inspections, signatures or approvals.
| Item | Fictional scenario |
|---|---|
| Initial | A surveyor approaches after a grading pass. |
| Change | The operator makes a small blade-angle adjustment while the chassis is stopped. |
| Failure | Vehicle standstill is mistaken for control of every moving part. |
| Outcome | The blade end can strike or trap the surveyor. |
| Barrier | Stop the adjustment, clear and account for personnel, and re-establish the separate survey and machine-operation phases. |
Why the controls matter
A stationary chassis can still move its blade and articulation joint. Survey entry is a separate controlled phase: stop the relevant movements, confirm the operator and surveyor agree on the safe state, then account for every person before readjusting.
The blade may project beyond the vehicle and side resistance can alter tire contact and machine attitude. Blade projection, articulation, cross slope and weak edges must be assessed together.
A sudden cutting resistance increase is a reason to stop and identify utilities, material changes or obstructions. Adding force can turn a small snag into lateral movement or damage. Hydraulic lift alone is insufficient support for personnel in a blade or articulation danger zone.
Decision sequence
| Step | Decision |
|---|---|
| Known | The operator makes a small blade-angle adjustment while the chassis is stopped. |
| Unknown | Actual condition, extent of damage and suitability of resistance changes, utility and material remain to be established. |
| Hold | Vehicle standstill is mistaken for control of every moving part. |
| Evidence | Link resistance changes, utility and material, depth and position, edge support, mechanical support, energy state to the affected equipment or work area. |
| Next | Stop the adjustment, clear and account for personnel, and re-establish the separate survey and machine-operation phases. |
5. Conditional decisions and common errors
| Condition | Action | Evidence | Proceed when |
|---|---|---|---|
| Survey entry | Stop and stabilize relevant motion | Personnel and operator agreement | Safe entry confirmed |
| Blade strikes | Stop cutting and investigate | Utility, depth and ground data | Cause resolved |
| Service needed | Isolate and mechanically support | Pressure, support and procedure | Service boundary secured |
| Roadbed handoff | Mark defects and limits | Survey, drainage and edges | Next-phase limits accepted |
Similar appearance, different evidence
The scenario and record comparisons are fictional teaching examples, not records of real incidents, measurements, inspections, signatures or approvals.
| Comparison | Supported decision | Insufficient basis |
|---|---|---|
| Condition | Personnel and operator agreement | Survey entry has not been resolved. |
| Evidence | Pressure, support and procedure | A photograph or a completed-looking task without the relevant inspection record. |
| Release | Next-phase limits accepted | Completion of one step does not release the excluded tasks in section 2. |
6. Roles and responsibilities
| Role | Responsibility |
|---|---|
| Work supervisor | Assign the task boundary, stop authority, interfaces and emergency communication for motor grader roadbed leveling. |
| Technical lead | Confirm Ground and edge condition; Utility record; Design profile and depth; Existing roadbed. Resolve design and manufacturer limits before work. |
| Authorized crew | Apply Brakes and controls; Blade condition; Leaks and articulation; Tires and operator protection. Stop when the working arrangement changes. |
| Inspector / receiving lead | Review Resistance changes; Utility and material; Depth and position; Edge support. Transfer Surveyed section; Drainage and edge limits; Parking state; Receiver and open defects. |
Role labels allocate responsibilities; they do not confer a legal qualification. Verify the competence, training and authority required for the actual task.
Record and handoff perspective
| Stage | Record controls | Verification |
|---|---|---|
| Review roadbed | 1. Record ground and edge condition2. Record utility record3. Record design profile and depth | 1. Utility record2. Design profile and depth3. Existing roadbed |
| Inspect grader | 1. Record brakes and controls2. Record blade condition3. Record leaks and articulation | 1. Blade condition2. Leaks and articulation3. Tires and operator protection |
| Enter and trial | 1. Record blade-end clearance2. Record trial ground response3. Record measured trial level | 1. Trial ground response2. Measured trial level3. People and signals |
| Cut and shape | 1. Record resistance changes2. Record utility and material3. Record depth and position | 1. Utility and material2. Depth and position3. Edge support |
| Service safely | 1. Record mechanical support2. Record energy state3. Record tools and technician | 1. Energy state2. Tools and technician3. Maintenance boundary |
| Inspect and park | 1. Record surveyed section2. Record drainage and edge limits3. Record parking state | 1. Drainage and edge limits2. Parking state3. Receiver and open defects |
7. Hold points and record comparison
| Hold point | Evidence before release | Actual record |
|---|---|---|
| HP-0 Start | Grade a planned roadbed using controlled cutting passes, reverse/turn transitions and separate survey or inspection access, followed by parking and handoff. | |
| HP-1 Separate survey | Surveyor location; Traffic boundaries; Blade and articulation; Operator contact | |
| HP-2 Enter and trial | Blade-end clearance; Trial ground response; Measured trial level; People and signals | |
| HP-3 Service safely | Mechanical support; Energy state; Tools and technician; Maintenance boundary | |
| HP-4 Inspect and park | Surveyed section; Drainage and edge limits; Parking state; Receiver and open defects |
These are internal hold points, not issued permits. Recheck affected points after a change, fault or shift handoff; link the actual approval record.
Record comparison
The scenario and record comparisons are fictional teaching examples, not records of real incidents, measurements, inspections, signatures or approvals.
The boxes are static record prompts, not interactive or saved approvals. A tick does not establish suitability or permission to restart. Record the evidence, person, time and unresolved issues; retain the change history.
| Record | Insufficient | Record checklist |
|---|---|---|
| Review roadbed | "Checked" without target, criteria or result | □ Ground and edge condition□ Utility record□ Design profile and depth□ Existing roadbed |
| Inspect grader | "Checked" without target, criteria or result | □ Brakes and controls□ Blade condition□ Leaks and articulation□ Tires and operator protection |
| Cut and shape | "Checked" without target, criteria or result | □ Resistance changes□ Utility and material□ Depth and position□ Edge support |
| Inspect and park | "Checked" without target, criteria or result | □ Surveyed section□ Drainage and edge limits□ Parking state□ Receiver and open defects |
8. Site checklist and emergency response
| Check | Result | Person / action |
|---|---|---|
| □ Review roadbed: Ground and edge condition | ||
| □ Separate survey: Surveyor location | ||
| □ Inspect grader: Brakes and controls | ||
| □ Enter and trial: Blade-end clearance | ||
| □ Cut and shape: Resistance changes | ||
| □ Reverse and survey: Rear path and signal | ||
| □ Service safely: Mechanical support | ||
| □ Inspect and park: Surveyed section | ||
| □ Emergency access and handoff restrictions |
Stop work
Stop travel and cutting for a blade impact, sudden resistance increase, ground settlement, lost signals or an unaccounted surveyor. Do not resume until the cause and the full swept-path exclusion are resolved.
Emergency response
For entrapment, stop and isolate the machine and call 911/site rescue. Do not manipulate the blade or articulation to attempt an improvised rescue; control stored pressure, gravity and movement with trained responders.
9. Sources and review limits
Public-source review: 2026-10-12. Official regulation pages and specific technical references are distinguished below; no agency or manufacturer has approved this content.
| Source | Reviewed scope and limitation |
|---|---|
| OSHA 29 CFR 1926.602 | Construction earthmoving equipment, graders, access grades, brakes and obstructed rear-view conditions. |
| OSHA 29 CFR 1926.600 | Construction equipment movement, servicing supports and parking controls. |
| OSHA State Plans | Official overview of federal and State Plan jurisdiction and differing public-sector coverage, checked 2026-10-12. Individual state rules require a site-specific check. |
No site measurements, equipment manuals for the actual installation, inspection records or signed technical approvals were supplied. Confirm the applicable requirements and actual product instructions before use; record each criterion with its units, source and equipment or work-area ID.
10. PDF guidance and FAQ
PDF A covers basic task controls; B focuses on technical failures; C covers supervision, records and handover. The article has eight stages with four items per main cell; each PDF has six key stages with three items per main cell. P/S/R/A, measurements, confirmations and signatures remain blank for actual site assessment.
Content group
jsa-grader-leveling
May a surveyor approach a stopped grader?
Only after blade, articulation and vehicle movement are controlled and entry is coordinated.
Should force be increased when the blade catches?
Stop and check the obstruction, utility location, depth and support conditions.
Is the vehicle width the exclusion boundary?
Include blade projection, articulation and the full swept path.
Can hydraulic pressure support a blade during servicing?
Use the manufacturer isolation and mechanical support procedure; do not rely on hydraulic support alone.
Has a professional approved this JSA?
This reference material was written and revised with AI. It has not been verified or approved by a professional. Review by a suitably qualified professional and required site approval are necessary before field use.
11. Revision history and authorship
This reference material was written and revised with AI. It has not been verified or approved by a professional. Review by a suitably qualified professional and required site approval are necessary before field use.
Korean source created 2026-09-19. This US edition adapts the Korean source; earlier editorial revisions do not constitute professional approval of this edition.
| Date | Edition | Change | Review status |
|---|---|---|---|
| 2026-10-12 | 1.0 | US localization: preserve task judgments; replace Korean legal applicability with scoped US references. | AI editorial and output checks; no professional technical approval. |