Gang Mower Operations SWMS

Gang mower operations involve towing or self-propelling multi-deck reel mower assemblies across sports fields, parklands, golf courses and large institutional grounds. The work combines mobile plant movement, hydraulic deck raise/lower cycles, high-speed reel rotation and significant projectile ejection zones — each creating discrete WHS hazards governed by Part 3.1 and Part 4.5 of the WHS Regulation 2025. Because the task involves powered mobile plant with hydraulic systems operating in shared public or worker-trafficked spaces, a Safe Work Method Statement is mandatory before work commences and must be reviewed at any change of site, vehicle, or operator. This SWMS documents the hazard identification, hierarchy-based controls, exclusion zoning and pre-start verification required so the PCBU discharges its primary duty of care under section 19 of the WHS Act and meets the consultation obligations under section 47.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.

1. 1Elimination — Substitute gang mowing on slopes exceeding manufacturer slope rating with hand-trimming or remote-controlled slope mowers to remove the rollover hazard entirely.
2. 2Elimination — Conduct documented pre-mow sweep of the area to remove stones, irrigation debris and buried hazards before any reel engagement occurs.
3. 3Substitution — Replace older open-deck gang units with modern rear-discharge enclosed-deck mowers fitted with deflector skirts to contain projectile ejection.
4. 4Engineering — Verify ROPS, seatbelt, hydraulic check valves and mechanical deck props are fitted, certified and functional before each shift via documented pre-start inspection.
5. 5Engineering — Install audible reversing alarm, amber rotating beacon and 360-degree mirrors or camera on tow vehicle to manage shared-space movement.
6. 6Engineering — Fit lockable hydraulic isolators and depressurise lines using manufacturer bleed procedure before any deck maintenance or blockage clearing.
7. 7Administrative — Establish and physically barricade a minimum 30 metre exclusion zone downrange of reels, enforced by spotters during public-access operations.
8. 8Administrative — Restrict operation to workers holding documented competency in mobile plant per the WHS Regulation 2025 with annual refresher and supervised verification.
9. 9Administrative — Schedule operations outside peak public-use windows and limit continuous seat time to two hours to manage vibration and fatigue exposure.
10. 10PPE — Issue Class 5 hi-vis garments, AS/NZS 1337.1 impact eyewear, AS/NZS 1270 Class 4 hearing protection, steel-cap boots and cut-resistant gloves for blockage tasks.

Applicable Codes of Practice

Worked example

At a regional sports precinct, a grounds crew is rostered to gang-mow three adjoining ovals before a weekend fixture. The supervisor opens this SWMS at the pre-start brief in the depot, projecting the hazard register on the tablet while the two operators and a spotter sign on. They walk through the projectile ejection control — confirming the 30 metre downrange exclusion zone and noting that an under-7 training session is scheduled on the adjacent oval at 09:30, so mowing of Oval 3 is resequenced to start there first and finish before juniors arrive. The hydraulic deck control prompts the lead operator to demonstrate fitting the mechanical deck props before the apprentice crawls under to clear a wrapped irrigation ribbon found during the pre-mow sweep. Mid-task, a pinhole hydraulic leak develops on the rear deck lift cylinder; the operator recognises the injection-injury hazard listed in the SWMS, isolates the circuit using the lockable isolator referenced in the engineering controls, tags the machine out and calls the workshop. The SWMS is re-signed when a replacement mower is brought to site, with the spotter confirming the new unit's ROPS, beacon and reversing alarm during a fresh pre-start inspection before reel engagement resumes.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• AS 2550 — Cranes, hoists and winches; AS 1418 series

Frequently asked questions