Picking the right excavator trencher isn't complicated—it's about matching the attachment to the machine you already have and the trenches you actually dig. Go too big for a mini excavator and you'll tax the hydraulics and make the machine feel tippy. Go too small and you'll struggle in compacted soil, maybe having to take multiple passes to hit depth. This guide runs through the key factors that decide which trencher fits your operation—carrier size, hydraulic output, trench dimensions, and ground conditions.
Start With the Excavator You Have
Your excavator is the first and biggest constraint. TGEC chain trenchers cover machines from 2.5 to 12 tons across four models, and each one is sized for a specific weight class. The TG-T600 is for 2.5 to 5 ton mini excavators, the TG-T900 handles 3 to 7 ton machines, the TG-T1200 fits 5 to 10 ton excavators, and the TG-T1500 is built for 8 to 12 ton carriers. If your machine falls in an overlap zone—say, a 5 ton machine that could work with either the TG-T600 or TG-T900—the tie-breakers are hydraulic output and the depth you need to reach, not just weight.
Beyond weight, check your lift capacity at the reach you'll actually be trenching at. The TG-T600 weighs 220 kg, the TG-T900 is 330 kg, the TG-T1200 comes in at 460 kg, and the TG-T1500 is 490 kg. Those numbers aren't huge compared to a bucket full of dirt, but the trencher sticks out front and the chain generates downward cutting forces that add to the load. A mini excavator that's right at its lift limit can get unstable when the chain is biting hard in tough ground.
Match Hydraulic Flow and Pressure
The trencher runs entirely off your excavator's auxiliary hydraulic circuit, so your machine's flow and pressure have to be within the model's specs. The TG-T600 and TG-T900 need 45 to 95 L/min (12 to 25 GPM) at 150 to 210 bar (2175 to 3045 psi). The TG-T1200 calls for 60 to 120 L/min (16 to 32 GPM) at 170 to 250 bar (2465 to 3625 psi). The TG-T1500 wants 100 to 150 L/min (26 to 40 GPM) at 170 to 250 bar.
If your flow is too low, the chain runs too slow to cut efficiently—especially in clay or compacted ground—and you'll have to creep forward, killing your productivity. Too much flow, and you risk overheating the hydraulic system and damaging the motor seals. Set the auxiliary relief valve to the trencher's specified working pressure, not the excavator's max system pressure, to protect the motor. If your excavator's auxiliary circuit doesn't match the range, you might need a different model or a flow divider.
Determine Trench Depth and Width
Depth is the next big number. Each model has three preset depths controlled by the depth foot. The TG-T600 does 300, 450, and 600 mm (11.8, 17.7, 23.6 in). The TG-T900 covers 600, 750, and 900 mm (23.6, 29.5, 35.4 in). The TG-T1200 reaches 800, 1000, and 1200 mm (31.5, 39.4, 47.2 in). The TG-T1500 goes 1000, 1250, and 1500 mm (39.4, 49.2, 59.1 in). Pick a model whose maximum depth covers the deepest trench you regularly dig—local utility codes often spell out minimum burial depths for different pipe and cable types.
Width determines how much dirt you move and how much backfill you'll need. The TG-T600 and TG-T900 give you four width options from 150 to 300 mm (5.9 to 11.8 in), which covers residential and light commercial work nicely. The TG-T1200 offers 150 and 200 mm, and the TG-T1500 is set up for 150 mm cuts. Most utility and irrigation jobs only need 150 to 200 mm wide trenches; bigger pipe or multiple conduits might call for 250 to 300 mm. A narrower trench means less excavation, less backfill, and faster restoration—but it still has to be wide enough for your pipe or cable plus the required bedding.
Assess Ground Conditions
Chain trenchers are built for soil, clay, loam, topsoil, and mixed ground with small gravel. The carbide-tipped teeth handle moderate compaction and occasional roots just fine. In sandy or gravelly ground, the teeth wear faster, so you'll need to inspect and ｒｅｐｌａｃｅ them more often. The trencher is not for solid rock, concrete, asphalt, or heavily frozen ground. If you hit rock or hardpan layers, you'll need to pre-rip with a ripper or switch to a rock saw before the trencher can do its job.
Ground conditions also affect how fast you can move. In loose topsoil, the chain cuts freely and you can keep a steady pace. In clay or compacted fill, you'll need to slow down so the teeth can fully penetrate and avoid stalling the chain. Wet soil can clog the chain with material, reducing efficiency and requiring periodic cleaning. Knowing what your typical job sites are like helps you decide whether a larger model with more hydraulic power is worth the investment—even if your trench dimensions could be handled by a smaller unit.
Consider the Application Mix
If you mostly do residential sprinkler and low-voltage cable work, you're usually looking at 600 to 900 mm depth and 150 to 200 mm width—that puts the TG-T600 or TG-T900 on a mini excavator right in the sweet spot. Utility crews doing water and gas lines often need 900 to 1200 mm depth, which points toward the TG-T1200 on a 5 to 10 ton machine. Municipal and commercial contractors laying big conduit or deep drainage may need 1200 to 1500 mm, so the TG-T1500 on an 8 to 12 ton excavator is the move.
If your work covers multiple depth ranges, go with the model that handles your deepest requirement—you can always set the depth foot shallower on a larger trencher. A bigger trencher on a properly sized excavator also handles harder ground better and keeps productivity up across a wider range of conditions. For a side-by-side look at how a trencher stacks up against a standard bucket, check out our trencher vs excavator comparison.
Final Selection Checklist
Before you pull the trigger, run through this: does your excavator's weight fall within the model's range? Does your auxiliary flow and pressure match the specs? Does the model's max depth cover your deepest need? Is the width you're after available for that model? Can your excavator's lift capacity at working reach handle the trencher weight plus cutting forces? And is a mounting bracket available for your specific excavator or quick coupler? Give your supplier the excavator make, model, pin dimensions, and hydraulic specs, and they'll make sure you get the right model and bracket ready to bolt on.
The TGEC excavator chain trencher is available in four models with factory-direct pricing and OEM options for dealers. Reach out to the TianGe sales team with your excavator details and job requirements, and we'll recommend the right configuration and send you a quote.
