What Comparing Excavators Really Means: The 12 Specs That Decide It
"Compare excavators before you choose" is advice everyone gives and nobody defines. Compare what, exactly? Dig depth? Price? Brand reputation? In practice, experienced buyers compare roughly a dozen things, in a particular order, and they compare them on written specification rather than on a seller's summary.
This article sets out what those dozen things are, why each one matters, and what a meaningful comparison looks like. It is written for buyers choosing a compact or midi machine for general contracting work, but the logic applies across the size range.
Why Comparison Goes Wrong
Most bad comparisons fail in one of three ways:
- Comparing labels instead of numbers. Model designations are marketing, not measurements.
- Comparing under different conditions. One machine's depth figure uses a long arm, the other's a standard arm.
- Comparing machines instead of packages. Attachments, warranty and support are part of what you are buying.
Fix those three and the rest of the comparison is straightforward.
The Twelve Things Worth Comparing
| # | Specification | What it decides | How to compare it |
|---|---|---|---|
| 1 | Operating weight | Class, transport, stability | Published ready-to-work weight, not model number |
| 2 | Transport width and height | Access | Retracted track width; height with boom lowered |
| 3 | Maximum dig depth | Which jobs are possible | Standard arm, stated bucket, level ground |
| 4 | Reach at ground level | How often you reposition | Same conditions on both machines |
| 5 | Dump height | Loading skips and trucks | At working reach, not minimum radius |
| 6 | Breakout force | Performance in hard material | Bucket and arm cylinder figures, quoted separately |
| 7 | Auxiliary hydraulic flow | Attachment capability | Litres per minute, against attachment requirement |
| 8 | Rated lift at working radius | What you can place, and where | Lift chart, or rated figure at 2–3 m |
| 9 | Track gauge range and shoe width | Stability vs ground pressure | Retracted and extended figures, shoe width |
| 10 | Tail swing type | Working in confined space | Conventional, short or zero tail swing |
| 11 | Engine and emissions specification | Legal use, resale, serviceability | Engine make, rating, and current compliance |
| 12 | Support package | Downtime and total cost | Warranty, parts stock, service network |
The Four That Decide Most Purchases
Within that list, four specifications carry most of the decision weight for compact machines:
- Transport width — because access failures eliminate a machine outright.
- Dig depth — because it determines which jobs you can quote for.
- Auxiliary flow — because it determines what the machine can become.
- Lift at working radius — because it determines what the machine can place, safely.
Everything else refines the choice between machines that have already passed those four tests.
What a Real Side-by-Side Comparison Looks Like
Build a simple table with three columns — your requirement, machine A, machine B — and fill it from written spec sheets. Do not accept verbal figures.
| Requirement | Your minimum | Machine A | Machine B |
|---|---|---|---|
| Passes 900 mm gate | 800 mm retracted | 780 mm | 1,050 mm — fails |
| Dig depth | 2.2 m | 2.35 m | 2.60 m |
| Auxiliary flow for a breaker | 30 l/min | 28 l/min — marginal | 42 l/min |
| Lift at 3 m radius | 400 kg | 420 kg | 480 kg |
| Towable on 3.5 t outfit | Yes | Yes | No — needs 7 t |
In that example, machine B is better on every performance line and still loses, because it fails access and transport. This is typical. Constraint failures beat capability advantages.
Performance Figures You Should Treat Carefully
- Maximum dig depth: best-case, standard arm, level ground. Reduce by 200–300 mm for planning.
- Maximum lift: quoted at minimum radius. Ask for the figure at your working radius.
- Breakout force: sometimes quoted for the arm cylinder rather than the bucket, which produces a larger number. Check which.
- Fuel consumption: almost never quoted. Estimate from engine rating and duty cycle, or ask operators.
- Engine power: gross vs net ratings differ; compare like with like.
How Much Difference Each Spec Really Makes
Not every item on the list deserves equal attention, and treating them as equal is how comparisons stall. A useful way to think about it: some specifications eliminate machines, some rank them, and some only matter when the first two are tied.
- Eliminating specs: transport width, transport weight and, where relevant, transport height. A machine that fails any of these cannot do the work regardless of everything else.
- Ranking specs: dig depth, reach, auxiliary flow and lift at radius. These determine how well the machine does the work, and they are where genuine differences between comparable machines show up.
- Tie-breaker specs: tail swing, track shoe width, control layout and cab specification. These matter for comfort and site fit rather than capability, and only decide things when the machines are otherwise even.
Work through the categories in that order and a comparison that looked like twelve separate judgements becomes three quick passes.
The Non-Specification Comparison
Once specifications are equal — and between well-matched machines they often are — the decision moves to factors no spec sheet covers:
- Parts availability. Which wears fastest on your work, and is it stocked locally?
- Service network. Who fixes it, how far away, and how quickly?
- Resale value. Recognised engines and current emissions compliance hold value materially better.
- Operator familiarity. Control patterns and visibility differ; a machine your operators already know is productive from day one.
- Delivery condition. Is pre-delivery inspection included, and does the machine arrive assembled and tested?
A Short Comparison Checklist
- Write your three hard constraints: access, depth, transport.
- Obtain written spec sheets — never verbal summaries.
- Normalise weight to operating weight.
- Compare depth and reach under identical arm and bucket assumptions.
- Check auxiliary flow against the attachments you will run.
- Get rated lift at working radius.
- Confirm track gauge range and shoe width.
- Compare the package: buckets, coupler, warranty, delivery, PDI.
- Check parts stock and service distance.
- Score it, then decide.
Twelve specifications sounds like a lot, but most take seconds to check once you have two spec sheets in front of you. The comparison that takes twenty minutes is the one that prevents the mistake that costs years.
Machines in the mini excavator collection publish full written specification for exactly this kind of side-by-side work, from the SDLE15 to the SDLE35.
