OMEF CS100 forestry pruner

Buyers arrive at the OMEF CS100 from one of two directions. Either they have a 1.6 to 3.5 tonne excavator already and want to know what pruning head it can actually carry, or they have looked at the CS200 and found that 210 kg is more than their machine will hold out over an orchard row. Both questions have the same answer, and it is the 120 kg, not the 100 mm.

Why attachment mass is the first number on this model

On the larger heads in the family, capacity leads and mass follows. Here the order reverses. A 1.6 tonne excavator carries a modest counterweight and a short front, and every kilogram hung on the stick at reach comes straight off what the chart allows. Take an illustrative case and assume a quick hitch at 25 kg: 120 kg of head plus that hitch is 145 kg before the limb is touched, and on a small carrier working at four metres of radius with the boom raised, that can be a meaningful share of the rated figure. The lift chart guide sets out how to read the chart at the radius you actually work at rather than the one in the brochure, and the 1 to 5 tonne class page covers what these machines can and cannot hold at height.

That is why the streamlined cutting head, with no grapple and no load-bearing rotator, is not a compromise on this model but the entire reason it fits. A comparable-capacity tool that also gripped the limb would weigh enough to move the CS100’s work up a carrier class, and the carrier class is exactly what the orchardist or council crew is trying not to change.

Reaching into a canopy rather than along a face

The CS100 cuts one chosen limb, rotates, and takes the next. The continuous tools in the OMEF range, the TG, BF, TRI and BTD, sweep a face and take everything in the swathe. In an orchard that distinction is the job. A grower removing limbs that have grown back into the picking alley, or lifting the skirt of a row before harvest, is choosing wood tree by tree, and a sweeping head cannot make that choice.

The 360 degree rotation is what turns a compact head into a canopy tool. A limb angling back toward the row can be met square from underneath or from the side without walking the machine to a new position, which matters because repositioning between every cut is where the hours go on a tight row spacing. The 100 mm capacity is the same nominal figure as a TRI bar, but it is spent differently: the TRI spends it on whatever falls into the sweep, the CS100 spends it on the one branch the grower pointed at. In dense Australian hardwood the comfortable working diameter sits under the published maximum, as the maximum versus production diameter guide explains.

Circuits and settings on a compact carrier

The head runs on 180 to 250 bar and 20 to 45 L/min through two double-acting lines, one for the cutting cylinder and one for rotation. On mini excavators the trap is that the second circuit is often absent, and the full treatment of that requirement, including diverters and what to specify, is on the CS400 page along with the hydraulic matching guide. What is worth saying here is that compact carriers are frequently delivered with the auxiliary relief set low for a hammer or a breaker, and a machine relieving at 170 bar will simply not reach the top of the cut range. That setting is a five minute conversation with the dealer before delivery and an expensive discovery afterwards.

The work it was bought for

Orchard and shelterbelt limb removal, formative pruning on young amenity trees, street and park maintenance where a climber would otherwise be rigged, and light branch management around sheds, fences and boundaries. The commercial argument in a council street program is rarely about cuts per hour. It is that the exclusion zone, the pedestrian control and the crew standing behind the tape are billed for the whole set-up regardless of how many branches come down inside it, so a head that lets one operator do from the seat what a climber and a groundsman would do from ropes shortens the expensive part of the day. See council parks and urban vegetation and farm shelterbelts and orchards for how those jobs are usually priced.

What it will not do

Nothing is held. Every piece the CS100 severs falls, and where a piece cannot be allowed to fall the tool is a grapple saw that retains and lowers it; that trade-off is set out in full on the CS300 page, in the grapple saw guide and in the pruner versus grapple saw comparison. At 100 mm the pieces are small, which is why the question feels less pressing here than further up the family, but a three metre branch over a glasshouse or a neighbour’s fence is still a three metre branch. Kilometres of continuous regrowth is TRI or BF work, and felling a stem with directional control is tree shear work. Exclusion zones and the relevant WHS procedures and manufacturer instructions apply to every cut, small pieces included.

Settling the order

Bracket and hitch for the exact carrier, the second double-acting circuit or diverter, hose lengths and routing so the loop survives continuous rotation, the relief and flow settings to be programmed before delivery, and blade options. Ask for the delivered weight in the configuration you are ordering, because that is the figure the lift chart check has to use, and price a blade and a seal kit with Machinery Specialist. The wear parts guide gives the general method; on a small head the items are the blade, blade bolts, pivot pin and bushes, cylinder seals and rotation motor seals.

What mechanisation actually replaces in an orchard

The honest comparison for a grower is not CS100 against another attachment. It is CS100 against a crew with pole saws, a ladder and a trailer. Illustratively, and assuming a block where each tree needs four limbs taken and a two-person crew averages six trees an hour, a day is roughly fifty trees and two wages. The same block worked from the seat of a machine already on the property is one wage, no ladder work, and the limiting factor becomes how fast the row can be cleared of what has been cut rather than how fast it can be cut. The figures are hypothetical and every block is different, but the shape of the saving is consistent: the head does not make each cut dramatically faster, it removes the labour and the height from the operation.

That has a second effect on timing. Hand pruning tends to be scheduled around available labour, which in practice means it happens when it can rather than when the trees want it. A head on the farm excavator can be put into a row on the day the weather and the crop allow, and short windows become usable. For a business weighing this against contracting the work out, the hire versus buy guide and the total cost of ownership guide set out how to compare a purchase against a recurring seasonal cost.

Changeover, storage and the rest of the year

A 120 kg head is the lightest thing in the OMEF pruning catalogue apart from the BF cutter bars, and its size shapes ownership in ways the specification does not show. It moves on a ute tray or a trailer rather than a float, it stores in a shed corner, and two people can handle it on a stand for blade work. On a farm or a council depot where the excavator does several jobs a week, that matters more than it sounds: an attachment that is awkward to move gets left on, and an attachment left on gets used for things it was not built for.

A quick coupler is the usual answer, and it carries a cost on a machine this size. The coupler adds mass at the worst possible place, right at the end of the stick, and it lengthens the front slightly, which pushes the head further out at any given boom position. Both effects come off the chart. It is still normally worth it on a mixed-duty machine, but the check has to be done with the coupler fitted and the numbers the changeover guide recommends collecting, not with the bare head weight. Where the machine is dedicated to pruning for a season, direct mounting is lighter and cheaper.

Transport is the other quiet advantage. A 1.6 to 3.5 tonne excavator and a pruning head travel on a plant trailer behind a suitable vehicle, without the permits, pilot arrangements or float booking that larger corridor work involves. The transport and mobilisation guide covers when that changes. For a contractor doing scattered small jobs across a district, the mobilisation saving across a year can be larger than any difference in cutting rate between competing heads.

Buying used

Small pruning heads turn up on the used market because the carriers they suit change hands often. Three things are worth checking beyond the obvious. The rotation motor and its seals, because continuous turning is what this head does all day and a weeping motor is an expensive repair on a cheap attachment. The pivot pin and bushes, where slop shows up as a blade that wanders off square and tears rather than cuts. And the hose loop through the rotation, which on a poorly set up machine has been rubbing for years. The used attachment inspection guide has the full method, and it is worth asking whether the head has spent its life in soft European timber or in Australian hardwood, because the answer shows in the blade.

Confirm before ordering

• Delivered head weight plus hitch checked against the carrier chart at the reach and height the orchard or street work needs
• Carrier auxiliary relief raised to the 180 to 250 bar window rather than left at a breaker setting
• Second double-acting circuit present or quoted, with flow inside 20 to 45 L/min
• Row spacing and canopy access allow the machine to sit still while the head rotates to successive limbs
• Hose routing proven through full 360 degree rotation
• Blade and seal kit priced with Australian stock confirmed
• Pedestrian or traffic control and green waste handling costed as their own line

Frequently asked questions