Conveyors: Hold the Restart After a Jam

Hazard-based toolbox talk 20 of 52, with a practical HOP exercise.

Plan a 5–10 minute toolbox discussion, plus time to verify the actual controls. The one-page toolbox talk and editable Word version are public. Separate supervisor and attendance records are included with free Safety & Systems membership.

Why this matters

A stopped conveyor may restart from another station or release trapped material. Clearing the jam and releasing the system back to operation need separate, controlled decisions.

Learning objective

Confirm protection and a coordinated release before conveyor restart.

Key hazards or failure points

Unexpected startup; pinch points; moving flights; stored energy; falling material; people at connected equipment.

Practical controls

• Use the equipment-specific shutdown and energy-control procedure. Authorized people protect every exposed worker before jam clearing or maintenance.
• Keep guards and designated crossing routes effective. Never climb, reach into or ride a conveyor to resolve a blockage.
• Coordinate upstream and downstream crews. Restore safeguards and follow the approved return-to-service process before the required startup warning and operation.

Verify It in the Field

• From safe access, match the conveyor and connected equipment to the work boundary. Have authorized personnel record the prescribed isolation verification.
• Confirm who owns the restart and how all affected people are accounted for. A cleared jam or reset emergency stop is not permission to run.
• Have the designated person verify restored guards and required safe control/warning checks. Record results with people clear; never test by entering a nip point.

Stop and reassess

Hold restart for anyone unaccounted for, uncertain isolation, missing protection or failed controls. Resolve the condition, reverify and communicate the authorized release.

Crew discussion questions

• Could another station start this conveyor?
• Who else is exposed along the system?
• What evidence permits the restart?

For each required control, record its acceptance source and criterion, safe verification method, responsible verifier, actual result and time. Mark VERIFIED, HOLD/NOT VERIFIED, or N/A with a reason. Complete all required inspections; never enter danger or improvise a test to fill out a form.

Use this HOP tool

Pause when unsure

Before releasing a cleared jam, ask what remains unknown about people, connected equipment or stored energy. Name the person who can resolve each uncertainty and the evidence needed. Keep the affected system protected until authorized verification and the restart handoff are complete.

This exercise supports hazard identification or control verification. It does not replace safeguards, required training, specialist decisions or work authorization.

Leader preparation and practical detail

The jam is only one part of the system

Illustrative situation: the local belt is clear, but another crew is working at the discharge. The restart owner must coordinate the connected work before release. Map the actual equipment boundary, material movement and affected positions. An upstream shutdown may leave gravity-fed material or stored tension unresolved; the procedure and authorized verification must address the energy that can reach the work.

Use the construction conveyor rule

Construction 1926.555 requires startup warning, specified stopping arrangements and protection during hazardous maintenance/repairs. Resetting an emergency-stop device is a prerequisite to restarting under (a)(3), not proof that personnel are clear or energy isolation is complete. General-industry servicing uses applicable 1910.147 requirements; that standard excludes construction employment. Do not substitute one industry’s scope for the other.

Make release explicit

Keep responsibility for return to service clear through the employer’s procedure. Record who confirmed the work complete, guards restored, people clear and control checks satisfactory. Do not bypass personal protections or remove another person’s device for convenience. The warning must be usable by affected workers, but a warning alone does not authorize exposing someone to moving equipment.

Short supervisor field check

• Equipment boundary matched
• Isolation verified by authorized person
• Affected people accounted for
• Guards and controls restored
• Restart release communicated

Use the separate sheet to document evidence, unresolved restrictions, correction owner, recheck and required release authority. Rebrief affected workers. This record does not replace specialist inspections, permits or engineering determinations.

Attendance and follow-through

Use the separate attendance record for participants, roles, questions, actions and late-arrival rebriefs. Attendance does not prove competence, functioning controls or authorization. Keep completed records private under employer procedures.

Source acknowledgment

HOP concepts are adapted from DOE-HDBK-1028-2009, Human Performance Improvement Handbook, Volume 2 (June 2009). Todd Jerome Jenkins makes no claim to authorship or copyright ownership of original U.S. Government work. The explanations and exercises are original adaptations; no endorsement by DOE or the U.S. Government is implied. Third-party material credited in the handbook retains its separate ownership.

HOP source: Volume 2/VOLUME 2 PAUSE WHEN UNSURE.pdf; Printed pp. 16–17. The handbook supplies concepts; task-specific technical references are listed below.

Technical scope and references

Technical sources inspected October 12, 2026; resource edition October 12, 2026. Apply current jurisdictional requirements, the actual task procedure, manufacturer instructions, permits and required competent or qualified decisions. This resource supplies no equipment-specific acceptance criteria.

1. OSHA 29 CFR 1926.555 — Construction conveyor startup warnings, stopping arrangements, guarding and maintenance protection.
2. OSHA 29 CFR 1910.147 — Applicable general-industry servicing and return-to-service requirements; construction excluded.
3. DOE-HDBK-1028-2009 Volume 2 — Pause when unsure — Printed pp. 16–17; historical HOP guidance adapted into an original exercise.

Connect this discussion to your JHA/JSA

Use the JHA/JSA planning and field-verification worksheet to connect this discussion to the actual task, controls and responsible people.

Related Todd Jerome Jenkins articles: How to Conduct a Job Safety Analysis and What Is Human and Organizational Performance?.

Related toolbox talks

• Machine Guarding: Reach-In and Entanglement
• Energy Isolation: Verify Before Servicing
• Pause When Unsure: Make the Restart Clear

Continue the hazard series

• Pallet Jacks: Leave Room for the Operator
• Floor Holes: Before the Cover Comes Off

Put one verification into practice

Record today’s change and evidence using the free JHA/JSA planning and field-verification worksheet.