Mini Excavator & Compact Loader Operations SWMS

Mini excavator, Kanga and Dingo (compact tracked loader) operations are routine on Australian residential, landscaping and civil sites, but the compact size of these machines masks substantial risk. Trenching below 1.5 metres, working adjacent to live underground services, traversing slopes near maximum gradient, and operating beneath overhead powerlines all trigger high-consequence hazards that have caused multiple fatalities and serious injuries nationally. WHS Regulation 2025 Part 4.5 (Plant) imposes duties on the PCBU to identify plant hazards, apply the hierarchy of control, and ensure operators are trained and competent before powered mobile plant is used. Excavation work below 1.5 metres is High Risk Construction Work under section 291, mandating a documented SWMS before work commences, signed by every worker, and kept on site for the duration of the activity. This SWMS addresses pre-start inspection, Dial Before You Dig service avoidance, slope access and egress, exclusion zones, and safe parking and shutdown procedures.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

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

1. 1Elimination — eliminate manual trenching adjacent to known services by relocating the trench alignment or using non-destructive hydro excavation where service plans show congestion.
2. 2Elimination — prohibit operation on slopes exceeding the manufacturer's stated maximum gradient by selecting an alternative access route or staging area.
3. 3Substitution — substitute the standard digging bucket for a tilt or grading bucket when working near identified services to reduce strike force and improve visual control.
4. 4Substitution — substitute diesel machines with electric or low-emission compact plant in enclosed or poorly ventilated areas to remove diesel particulate exposure.
5. 5Engineering — confirm ROPS, FOPS and operator seatbelt are fitted, certified and functional per AS 2294 before any slope or excavation work commences each shift.
6. 6Engineering — install physical exclusion barriers, witches hats and slew-radius signage establishing a minimum 1.5 metre buffer around the operating machine envelope.
7. 7Administrative — obtain current Dial Before You Dig plans within 30 days of works, conduct potholing by hand or vacuum within 500mm of marked services, and brief all workers at pre-start.
8. 8Administrative — verify operator competency through VOC or HRW licence records, enforce spotter use within 6.4 metres of overhead lines, and maintain shift logbook and pre-start checklist.
9. 9PPE — issue and enforce hard hat, hi-vis Class D/N compliant with AS/NZS 4602, steel-cap boots to AS/NZS 2210.3, Class 5 hearing protection and P2 respirator during dry trenching.
10. 10PPE — provide anti-vibration gloves meeting AS/NZS 2161 for sustained operation and impact-rated eye protection to AS/NZS 1337 when working in debris-generating conditions.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

On a suburban townhouse development, a sole-trader landscaper is engaged to excavate a 1.8 metre stormwater trench using a 1.7 tonne mini excavator and remove spoil with a Dingo loader. At the 7:00am pre-start brief, the supervisor opens this SWMS on a tablet at the site shed and walks the operator and two ground workers through it section by section. The DBYD plans are cross-checked against the marked trench line and a Telstra conduit is identified within 600mm of the proposed alignment — the team agrees to hand-pothole the first metre before any mechanical digging, as the SWMS administrative controls require. The supervisor checks the ROPS certification sticker, confirms the seatbelt latches, and tests the park brake on the slight crossfall near the site boundary. All three workers sign on to the SWMS and the document is pinned to the site noticeboard. Mid-morning, an unmarked irrigation line is exposed during potholing; the operator stops work, the supervisor amends the SWMS hazard register on the tablet, adds a manual capping control, and re-briefs the crew before resuming. At smoko, the operator parks the excavator with the bucket grounded, engages the park brake, and isolates the battery as the safe parking control requires. The signed SWMS is retained on the project file for the statutory period after practical completion.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• Code of Practice — Hazardous Manual Tasks

Frequently asked questions