Mowing safety on slopes and difficult terrain

The rollover risk

Ride-on mower rollovers cause deaths and serious injuries across Australia each year. The ACCC records an average of two fatalities per year nationally, across all ride-on mower incidents, with hundreds of injuries recorded. WorkSafe Victoria identifies steep slopes as a primary risk factor, noting that side-slope rollover presents the highest risk on zero-turn mowers specifically.

Most manufacturers certify standard ride-on mowers for use only up to 15 degrees and advise strongly against operation on steeper terrain. At 20 degrees, a standard machine is operating well outside its certified envelope and the lateral rollover risk increases significantly. Many operators ignore this.

The most dangerous scenario is a lateral rollover on a side slope — where the machine tips sideways rather than backwards. Lateral rollovers happen fast and offer little opportunity to react. Operator injury or death can result from the machine rolling onto the operator, or from the operator dismounting onto the slope as the machine tips.

How the Ventrac 4520P addresses these risks

• Low centre of gravity — engine and drive components sit close to the ground, lowering the tipping point compared to conventional tractors
• Articulated and oscillating frame — the machine bends in the middle and the frame flexes, maintaining ground contact and stability over uneven terrain
• All-wheel drive — power to all four wheels reduces the tendency for uphill wheels to spin and the machine to slide laterally
• Hydrostatic braking — the operator can brake downhill to a controlled stop without relying on disc or drum brakes that can fade on steep grades
• Dual wheels — the wide stance created by dual wheels significantly increases lateral stability, enabling the 30-degree continuous operating rating

Wet weather and slopes

Wet grass dramatically increases the risk of equipment sliding, even on slopes well within the rated operating angle. We don't operate on slopes in wet conditions — not while it's raining, and not for a period after heavy rain until ground moisture has dissipated. This is a non-negotiable operating policy, not a weather preference.

What to ask a mowing contractor

If you're engaging a contractor to mow a steep property, ask three questions before they start:

• What is the published slope rating of your equipment — and is that with standard wheels or dual wheels fitted?
• What is your wet weather policy for slope mowing?
• Do you conduct a site walk before the first visit to assess the terrain?

If they can't answer all three specifically, that is useful information.

Want to maintain your own property?

If you're keen to look after your own property, the Useful Resources page lists suppliers of slope-rated machinery suitable for the terrain around Pullenvale.

Sources: ACCC Product Safety ride-on mower guidance, WorkSafe Victoria ride-on mower rollover safety guidance, Ventrac published operator specifications. Links to be inserted at publication.