A long-reach machine looks like a standard excavator with a longer boom and arm bolted on. It is not. The front is a system: geometry, cylinder sizing, hose volume, relief settings, counterweight and transport all change together, and the parts that stop being interchangeable are the ones buyers discover after the second breakdown. Guangzhou Shenyue Machinery Technology Co., Ltd. quotes these fronts regularly for 30 to 50 tonne classes, and the questions that decide the order are predictable.
What the extra length does to the machine
Reach is bought with capacity. Moving the bucket further from the centre of gravity increases the overturning moment, so the same bucket holds less, the same cylinder works harder and the same pin carries more. Manufacturers compensate with a heavier counterweight, larger bore cylinders on the boom and arm, and revised relief settings so the front cannot be overloaded into a stall. A machine that has been converted with a longer front but no counterweight change is a stability problem, not a productivity gain.
| Part group | Standard front | Long-reach front |
|---|---|---|
| Boom and arm | Standard sections, standard pin spacing | Purpose-built sections with different pin geometry; not interchangeable |
| Boom and arm cylinders | Standard bore and stroke | Larger bore or longer stroke; rod and seal kits differ |
| Hoses and tubing | Standard length runs | Longer runs, more oil volume, different clamp positions |
| Pins and bushings | Standard sizes | Same nominal pin, higher load per unit area, faster wear |
| Counterweight | Matched to standard front | Heavier; part number and mounting differ |
| Bucket linkage | Standard linkage and bucket | Often lighter bucket; linkage ratios change |
Cylinders and the oil behind them
Longer cylinders displace more oil, and longer hoses hold more of it. Two consequences follow. First, the machine takes longer to fill the front circuit at start-up and can behave as if it is low on oil when the tank level is correct. Second, cycle times soften unless flow is matched to the new volume, which is why some long fronts feel slow even when pressures test correct. When a cylinder is resealed, order the kit for the cylinder on the machine, not for the model badge: a long-reach boom cylinder and a standard one share a rod diameter far less often than buyers expect.
Where the wear goes first
Front pin and bushing life shortens disproportionately. The load per unit area rises, the arc of travel is longer, and greasing intervals that were adequate on a standard front are marginal here. The arm bushing in our records, LC12B02199P1, is a good example of the part that fails quietly: clearance opens, the pin hammers, the bore goes oval, and by the time it is noticed the arm boss needs line boring rather than a bushing. Measure clearance at every service and replace bushings before the pin surface is damaged. Guangzhou Shenyue Machinery Technology Co., Ltd. stocks bushings and pins against the number on the worn part rather than the model badge. The pin and bushing guide covers the measurement, and the boom and arm crack guide covers what happens when it is left too long.
Hoses, clamps and routing
Long fronts use longer hose runs with more flex points, and the failure mode moves from burst to abrasion. Check where each hose passes a clamp or a structure edge, and replace any hose that has lost its outer cover in that zone rather than waiting for a pinhole. Our hose records include LC05P00043S032 and LC05P00043S002C, quoted together for the same application; quote the full number from the hose you are removing. Hose length is a specification, not a cut-to-fit decision — a run that is too short loads the fittings, and one that is too long rubs somewhere new.
Match the front to the serial. A long-reach conversion is only safe when the counterweight, relief settings and hydraulic flow are all part of the package. Guangzhou Shenyue Machinery Technology Co., Ltd. asks for the machine serial and the front's own identification before quoting, and can supply genuine, OEM and aftermarket options with the difference stated line by line.
Transport and the 35 to 50 tonne question
A long front rarely travels assembled. Boom and arm come off, the counterweight may come off, and the transport plan becomes part of the owning cost. That reality is worth pricing before the machine is bought: the front that reaches furthest also costs the most to move, and the 35 tonne class and 46 tonne class pages show how much machine sits behind the front. Kobelco's published configuration data at kobelco.co.jp remains the authority on what a given serial left the factory with; anything else is an assumption with freight attached.
Frequently Asked Questions
Can I fit a long-reach boom to a standard Kobelco excavator?
Only as a complete package. The front changes the overturning moment, so the counterweight, cylinder sizing, relief settings and hydraulic flow all have to match. Bolting a longer front onto a standard counterweight creates a stability problem. Confirm the configuration against the machine serial before ordering any part of it.
Why do long-reach machines wear front bushings faster?
The same nominal pin carries a higher load over a longer arc of travel. Clearance opens sooner, the pin starts hammering and the bore goes oval. Measure clearance at every service and replace bushings such as LC12B02199P1 before the pin surface is damaged, or the repair becomes line boring.
Are long-reach boom cylinders the same as standard ones?
Rarely. Bore, stroke and rod diameter are usually different, and the seal kit follows the cylinder rather than the machine model. Order against the number on the cylinder you are resealing, not against the excavator badge, and expect hose runs to differ as well.
Does a longer front change hydraulic oil capacity?
It increases the volume held in the front circuit, so the machine can behave as if it is low at start-up and cycle times soften unless flow is matched. Check level with the front in the specified position, and treat longer hose runs as a specification rather than a cut-to-fit item. Guangzhou Shenyue Machinery Technology Co., Ltd. quotes hose and cylinder parts against the number on the failed part.