Verify the lift chart with 2,500 kg fitted
At this attachment mass the chart is the decisive specification. Run it at the reach, slew and ground conditions the work uses rather than at the machine's best case.
Where this machine sits
The ST140 takes the same approach to a larger scale: 2,500 kg, a 1,400 mm opening and up to 90 tonnes of cylinder force on 20-35 tonne carriers. The opening in particular is a step change rather than an increment, and it is what makes the attachment viable on mature plantation and native stumps that the mid-size shear cannot engage.
As with all attachment-based work, the carrier is the constraint rather than the attachment. A 2,500 kg shear held at reach on uneven ground is a substantial demand on the lift chart, and the published carrier class is the beginning of that check rather than the end of it.
Specifications
Indicative published manufacturer and distributor information. Confirm every figure, lift chart and hydraulic requirement with the manufacturer or authorised dealer before purchase.
What the published figures actually constrain
A specification table tells you what the machine is. This is what each of those numbers means for the work you would put it to.
The four checks that decide whether your carrier can run this
Each of these can fail independently, and passing one says nothing about the others. Weight class alone is the weakest of the four and the one most often relied on.
Where this machine earns its cost
Wrong machine when
- Carriers below the 20 t class
- Sites where ground disturbance is restricted
Verify these for this specific model
Beyond the standard buying criteria for the class, these are the questions this machine in particular raises.
What drives the cost of owning this machine
Capacity at this scale earns where stump size or density would otherwise defeat a smaller shear — typically mature plantation conversion and heavy clearing. Below that, the heavier attachment and carrier are capital carried for capability rarely used.
The carrier requirement is part of the true cost. Moving from a 12-20 tonne to a 20-35 tonne carrier changes capital, transport and operating cost across the whole combination, and that belongs in the comparison rather than the attachment price alone.
Blade, pivot and cylinder wear scale with material density and soil contact. Hard, rocky sites work the attachment in ways that show up as maintenance rather than as a production shortfall.
Ownership considerations in Australian conditions
Confirm continuous hydraulic supply
Flow and working pressure must be sustained by the carrier's auxiliary circuit, not peaked to. This is a separate check from weight and lift.
Justify the size with actual stump dimensions
Measure stump diameter at ground level across representative ground. If most stumps fall inside a mid-size shear's opening, the larger attachment is capability carried and seldom used.
Common questions about this machine
Alternatives to compare against
Other stump shears covered in this guide.
Fleet packages that use this class
Commercial land clearing
A deliberately flexible attachment-based system. Instead of owning six specialised purpose-built forestry machines, the same base excavator generates revenue across civil earthworks, demolition, vegetation clearing, log handling, tree removal, stump removal, road construction and drainage.
Plantation re-establishment
A sequence rather than a machine: stump treatment, then slash treatment, then tillage, scarification or mounding, then planting. Measured in hectares and planting spots, not cubic metres.