A swing boom, sometimes called an offset boom, lets the arm work to the side of the machine instead of straight ahead. That single change turns the excavator into a tool for working along walls, kerbs, fence lines and foundation edges, anywhere the tracks cannot or should not go.
MINGYI builds swing boom machines across the compact classes, and the option is confirmed at the ordering stage rather than retrofitted. This page sets out the jobs that justify the swing boom and how the rest of the specification is chosen around it.
Work that needs an offset arm
Digging a trench against a house wall while the machine sits in the garden, cutting a drainage channel beside a boundary fence, and trenching along a kerb line in a live road all require the arm to reach sideways. With a conventional boom the machine has to reposition constantly or straddle the line of the dig.
The swing boom keeps the tracks on firm, safe ground while the work happens offset to one side. It also helps inside buildings, where the machine can dig along a wall while its tail stays clear of the opposite partition.
Building the specification around the boom
The swing boom pairs naturally with a short tail swing body, so the machine stays compact even at full offset. Track choice follows the surfaces involved: rubber tracks for paved and turfed sites, steel tracks with rubber blocks for rough verges and demolition ground.
Confirm the offset range you need for your typical trench lines at the ordering stage, together with the class within the 1 to 3.5 tonnes working band and the attachment list. All of it is recorded against the machine before assembly.
Describe the lines you dig along, walls, fences, kerbs, and how much offset the work needs, and the swing boom build will be planned from those facts. Mingyi Machinery supplies each machine with the parts and service information for the field.
Interior and light demolition with offset boom for mini excavators Interior demolition is an access and a weight question. The excavator that fits through a doorway and works on a suspended floor does jobs that would otherwise be done by hand or by a larger machine that cannot enter. Dust, debris clearance and floor loading all argue for a compact machine indoors. This class of machine spreads its weight over a wider track footprint than a wheeled machine of similar capacity. Specifying offset boom for mini excavators against a job list Buyers who skip this step either over-buy or under-buy. The unit in daily use specified only from machine size tends to arrive without the coupler, the circuits or the track type the work actually needs. Useful information to send with an enquiry includes working width, required digging depth, ground conditions and the attachment set. Those four items let the factory specify a machine of this size that fits rather than a generic build. Working a offset boom for mini excavators in confined spaces Clearance above matters as much as around. Door heights, pipework and overhead services set the limit for the equipment on site indoors, and measuring them first avoids a machine that arrives and cannot be used. Ventilation is the other indoor constraint. Running the machine itself inside a closed structure needs air movement, and that is a planning item rather than something to discover after the first hour. Road and paving work for offset boom for mini excavators Patching and reinstatement favour a machine that can work in a lane closure. The model in question occupies less road than a full-size excavator, which reduces the traffic management needed and the length of the closure. Breaking out a failed slab and backfilling the same hole in one visit is normal work for the machine in that duty. The breaker and the bucket come off the same coupler, so the road is reopened the same day. Getting offset boom for mini excavators through a narrow gap Access decides the machine before output does. With the unit on the job the limiting dimension is usually the widest point on the way in, so measuring the gate, the corridor and the turning space first saves a wasted delivery and a second visit. Contractors who buy a machine built for the work normally have one job in mind that nothing else reaches. The purchase order follows the access measurement, not the other way round, and the build sheet is then settled around it. Working on slopes and uneven ground with offset boom for mini excavators Ground that looks level often is not. The equipment in service crossing a filled trench, a soft edge or a hidden void behaves differently from one on undisturbed ground, and those are the places worth walking before driving. Planning the direction of travel helps. Working so that the excavator is stable under load and not required to turn on a slope is a decision made before the job starts, not a correction made during it. Parts, service and support for this class of machine Engine parts availability usually drives the engine choice. The unit in daily use built with an engine the local network already carries is serviced from stock rather than from an international order. Remote support is handled by video. A machine of this size fault can often be diagnosed on a walk-around call with the panel open, which is faster than waiting for a visit and avoids shipping a part that is not needed. Working the equipment on site through the seasons Weather decides which days are productive. Rain turns some ground unusable and cold changes how the machine itself starts and warms up, so planning the wet months around maintenance is more useful than planning around output. Seasonal planning smooths the workload. Machines that are busy for a few months and idle for the rest benefit from a service slot in the quiet period, and the model in question prepared in the off-season starts the busy months reliably. Operator technique for the machine in that duty Output on a compact machine comes from placement rather than power. An experienced operator keeps the unit on the job working inside the swing arc, positions once and digs a full run instead of repositioning for every bucket. The second habit is tool discipline. Running a machine built for the work with the right bucket width for the trench means less spoil, less reinstatement and a cleaner job than a wide bucket and a lot of trimming. Hydraulic circuits on the equipment in service Flow and pressure are matched to the tool, not to the machine size. Asking for the attachment list first means the excavator leaves the factory with circuits that suit the heaviest tool the buyer intends to run. Hydraulic specification is easier to settle at build time than to correct later. This class of machine delivered without auxiliary lines can still dig, but every additional tool becomes a retrofit project. Acceptance checks when the unit in daily use arrives Delivery day is the best time to find a problem. Checking the specification against the order, the fluid levels, the fasteners and any transport damage while the equipment on site is still on the trailer is faster than claiming later. A function check before the machine goes to work is worth the hour. Running through the controls, the travel and the attachment circuit on a machine of this size confirms it is set up as specified and ready for the site. Engine options behind the machine itself Power unit selection is settled against the service network the buyer already uses. MINGYI offers Kubota D722, Kubota D902, YANMAR, Changchai, Laidong, Runtong, YARMAX, Youpu 2V80 and Youpu 195, so a fleet running one brand of engine can keep the same filters, the same parts supplier and the same mechanic. Two buyers can order the same the model in question and receive different engines. The decision is rarely about peak power; it is about which parts counter is closest to the site and which engine the local mechanic already knows. Boom configuration for the machine in that duty Detachable boom sections are used where transport length matters. The unit on the job that has to travel on a standard trailer can be built so the arm comes off for the road and goes back on at the site. Specification data for a machine built for the work Where the equipment in service is being specified for a job list, the table below gives the factory figures that matter most: what the machine weighs, how deep and how far it works, and what it measures on a trailer. These are the reference figures for the excavator. MINGYI confirms the final build sheet, including engine and attachment choices, against the destination and the job list before production. A swing boom lets the machine dig parallel to its tracks without repositioning, which is what makes trenching beside a wall or a fence practical. On this class of machine this is often the option that decides whether a job is possible at all. Extended and offset boom configurations change reach and working range. The unit in daily use with a longer arm reaches further but lifts less at full extension, so the specification is set against the deepest and furthest point on the job list.
Reference specification — mini excavator range 09W 13W 15W 30-1W Operating weight 1100 kg (2425.08 lb) 1300 kg (2866.01 lb) 1400 kg (3086.47 lb) 2900 kg (6393.41 lb) Transport size (L×W×H) 1800 × 750 × 1970 mm 2200 × 930 × 2250 mm 2200 × 930 × 2250 mm 3000 × 1250 × 2780 mm Max digging depth 1250 mm (49.21 in) 1630 mm (64.17 in) 1630 mm (64.17 in) 2200 mm (86.61 in) Max digging height 2800 mm (110.24 in) 2750 mm (108.27 in) 2750 mm (108.27 in) 3400 mm (133.86 in) Max dumping height 1700 mm (66.93 in) 1960 mm (77.17 in) 1960 mm (77.17 in) 2400 mm (94.49 in) Max digging radius 2570 mm (101.18 in) 2900 mm (114.17 in) 2900 mm (114.17 in) 4000 mm (157.48 in) Max digging distance 1869 mm (73.58 in) 2100 mm (82.68 in) 2100 mm (82.68 in) 2800 mm (110.24 in) Minimum turning radius 1000 mm (39.37 in) 1300 mm (51.18 in) 1300 mm (51.18 in) 2000 mm (78.74 in) Travel speed 3 km/h (1.86 mph) 3 km/h (1.86 mph) 3 km/h (1.86 mph) 5 km/h (3.11 mph) Gradeability 30° 30° 30° 30° Fuel consumption 1-1.3 L/h (0.264—0.343 gal) 1-1.3 L/h (0.264—0.343 gal) 1-1.3 L/h (0.264—0.343 gal) 2-3 L/h (0.528—0.793 gal) Fuel tank capacity 8 L (2.11 gal) 10 L (2.64 gal) 10 L (2.64 gal) 16 L (4.23 gal) Hydraulic oil tank 16 L (4.23 gal) 16 L (4.23 gal) 16 L (4.23 gal) 20 L (5.28 gal) Dozer blade lift height 180 mm (7.09 in) 180 mm (7.09 in) 180 mm (7.09 in) 420 mm (16.54 in) Dozer blade drop depth 210 mm (8.27 in) 210 mm (8.27 in) 210 mm (8.27 in) 210 mm (8.27 in)
Q. Who uses the machine of this size?
A. Boom geometry is the difference between repositioning the machine ten times an hour and digging through from one stable stance. Reach without width is the compact excavator trick: the boom crosses the obstacle while the tracks stay on firm ground. Read the equipment on site together with the engine, track and attachment pages: jobs around mini excavators are decided by how those choices line up, not by any single number on the sheet.
Q. Which boom suits working along walls and kerbs?
A. An offset or swing boom keeps the carrier square to the trench while the stick tracks the line - no repositioning, no leaning the machine at the structure. For straight runs beside fences and foundations it is the difference between a clean day and a slow one.
Q. How do I get a specification?
A. Send the model, the destination and the attachment list by email or LINE - the channels listed just below this section. The reply covers the specification, lead time, packing and freight in one document, with the mini excavators build sheet attached.
Moving the machine itself between sites
Travel time is not working time, and it should be planned as its own item. The hours spent moving the model in question between jobs are hours not worked, and a trailer that matches the machine reduces them every single trip.
Reading the early symptoms on the machine in that duty
Machines rarely fail without warning. A change in sound, a slower function or a new leak on the unit on the job is the machine saying something early, and listening then takes a fraction of the time that waiting does.
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