OMEF · Tree shear

OMEF Big Inch BI600

Name: OMEF Big Inch BI600
Brand: OMEF

2,400 kg shear for 30 t+ carriers needing ~250-300 L/min — a different category from compact shears.

5 published specificationsAustralian representation: Randalls

Positioning

Where this machine sits

The BI600 is a different category from compact shears: 2,400 kg on 30 tonne-plus carriers, a 700 mm published maximum cut, and a hydraulic requirement of roughly 250-300 litres per minute. That flow figure alone excludes most machines that could physically carry the attachment.

It is a production clearing tool rather than a general-purpose attachment. The carrier it demands is a substantial machine in its own right, and the combination only makes sense where large material is a regular part of the work rather than an occasional exception.

Published figures

Specifications

Indicative published manufacturer and distributor information. Confirm every figure, lift chart and hydraulic requirement with the manufacturer or authorised dealer before purchase.

Carrier class	30 t and above
Weight	2,400 kg
Maximum published cut	700 mm
Hydraulic requirement	~250-300 L/min
Australian distributor	Randalls

Interpretation

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.

Published figure	What it means commercially
30 t and above carrier class, 2,400 kg attachment	Mass and material weight both demand a large carrier. The lift chart with the attachment fitted at working reach is the decisive check.
~250-300 L/min hydraulic requirement	A demanding continuous flow that many 30 tonne excavators do not supply as standard. Confirm the auxiliary circuit's continuous rating before assuming a match.
700 mm published maximum cut	Severing capacity for large material. As always, whether the boom can hold that material at reach is a separate and usually tighter constraint.
Randalls Australian distribution	Support for a high-duty attachment. Blade, pivot and cylinder service is more consequential at this scale than on a compact shear.

Before it fits

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.

Check	For this attachment
Mass the carrier must control at reach	2,400 kg plus rotator and coupler, on a 30 t-plus carrier. Run the chart at real working geometry, not the machine's best case.
Continuous hydraulic flow	~250-300 L/min — the requirement most likely to disqualify a carrier that could otherwise physically hold the attachment. Many 30 t excavators do not supply it as standard.
Working pressure	Confirm working pressure at that continuous flow; cycle speed on large material depends on it.
Cooling under sustained load	At this flow, sustained production shearing generates real heat. Confirm the cooling package supports it.

Commercial fit

Where this machine earns its cost

Right machine when

Large-scale clearing on a 30 t+ carrier with hydraulics genuinely sized for 250-300 L/min
Heavy timber where smaller shears stall

Wrong machine when

The carrier can only peak at the required flow rather than sustain it
Transport mass is already marginal

Before you sign

Verify these for this specific model

Beyond the standard buying criteria for the class, these are the questions this machine in particular raises.

Continuous flow at 250-300 L/min, and pressure at that flow
Cooling capacity at sustained duty
Transport width, height and mass with the attachment fitted

Running cost

What drives the cost of owning this machine

This combination is justified by sustained large-material clearing rather than by versatility. The carrier and attachment together represent substantial capital, and the utilisation argument that supports smaller attachment-based fleets is weaker at this scale.

The hydraulic requirement may itself drive the carrier choice or require a specified configuration, which is an additional cost that is easy to overlook when comparing attachment prices.

Wear scales with material size and density. At this duty, blade, pivot and cylinder condition need monitoring as a maintenance programme rather than as occasional inspection.

In practice

Ownership considerations in Australian conditions

Confirm continuous flow before anything else

A 250-300 L/min requirement excludes many carriers that could otherwise hold the attachment. Check the auxiliary circuit's continuous rating and the cooling that comes with it.

Run the chart at real working geometry

2,400 kg plus large green material at reach is a serious demand. Use the reach and slew angle the work requires, not the machine's most favourable case.

Establish that the material justifies the scale

Large material has to be a regular part of the work. Where it is occasional, handling it another way is almost always cheaper than carrying this combination.

Questions

Common questions about this machine

Why is the hydraulic requirement so much higher than smaller shears?

Because cylinder force and cycle speed both scale with the attachment. A shear that closes on 700 mm material needs substantial flow to do it at a workable rate, and doing it repeatedly through a shift needs that flow continuously rather than in bursts. It is the requirement most likely to disqualify a carrier that could otherwise physically handle the attachment.

Does a 30 tonne excavator automatically suit this attachment?

No. Three separate checks have to pass: the lift chart with 2,400 kg fitted at working reach, the auxiliary circuit's continuous flow of 250-300 litres per minute at the required pressure, and cooling capacity for sustained duty. A machine in the right weight class can fail any of them, and the hydraulic check is the one that most often does.

When is this the right tool rather than a purpose-built feller buncher?

When large-material clearing is regular but not enough to support a dedicated felling machine, and the carrier can earn elsewhere in civil, demolition or log handling. Where felling hours are high enough to justify a purpose-built machine, the feller buncher will out-produce this combination substantially — the attachment-based approach trades production for utilisation, and at this scale that trade is closer than it is with compact shears.

Same class

Alternatives to compare against

Other tree shears covered in this guide.

OMEF

Big Inch BI300

420 kg shear for 8-14 t excavators, 300 mm published maximum cut — the regrowth and fence-line workhorse.

OMEF

Big Inch BI500

1,810 kg shear for 23-30 t excavators with 600 mm published maximum cut.

TMK

TMK 300

310 kg shear for 6-20 t excavators — 250 mm hardwood, 300 mm softwood, and the difference matters.

In service

Fleet packages that use this class

Package D

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.