Order the Thumb With the Machine, Not After Mechanical or hydraulic, sized to the bucket, and plumbed from the start. Why the thumb is the add-on nobody regrets and everybody delays
Disclosure. We sell excavators and thumbs, and yes, this is an article telling you to buy both at the same time. In our defense, it is also the cheaper way to do it.
Nobody has ever returned a thumb. Plenty of people have paid extra to add one later.
A thumb turns a digging bucket into a hand. Rocks, logs, broken concrete, brush and pipe all become things you can pick up and place instead of push and hope. Most owners who buy without one call us within a season. Here is how to get it right the first time.
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Mechanical or Hydraulic
| Factor | Mechanical thumb | Hydraulic thumb |
|---|---|---|
| Adjusting position | Get out and move a pin | From the seat, on the fly |
| Grip on odd shapes | Fixed, the bucket does the work | Clamps and holds |
| Needs an auxiliary circuit | No | Yes |
| Cost | Lower | Higher |
| Maintenance | Very little | Hoses, cylinder, valve |
| Best for | Occasional rock and brush work | Daily sorting, demo, placing material |
Mechanical thumbs are fine for owners who grab something now and then. Anyone who picks and places material most days should buy hydraulic. Progressive link hydraulic thumbs keep their grip through more of the bucket's travel, which matters for long logs and pipe.
Why Ordering It With the Machine Saves Money
Adding a thumb later is a small construction project on your excavator.
Sizing the Thumb to the Bucket
A thumb has to close against the bucket teeth, not beside them or past them.
Model matters. Thumbs are quoted to the specific machine, whether that is a KX040, a U35 or a U17, and to its bucket.
What a Thumb Actually Does for You
The Short Version
You will want one
Most mini excavator owners end up adding a thumb. Plan for it.
Hydraulic for daily use
Mechanical works for occasional grabbing. Hydraulic wins for regular sorting and placing.
Set it up at purchase
The circuit, bracket and thumb are simpler and cheaper to do once.
Size it to your bucket
Width and tip radius have to match the bucket you use most.
Five Questions to Ask When You Order
- Will I grab material occasionally or every day?
- Does this machine have the auxiliary circuit a hydraulic thumb needs?
- Which bucket will I use most, and is the thumb matched to it?
- Will I run a quick coupler, and has that been accounted for?
- Can the thumb be included in the same purchase and financing?
Straight Answers
Do I need a thumb on a mini excavator?
Not to dig, but most owners want one. A thumb lets you pick up and place rock, logs, brush, concrete and pipe instead of pushing them.
Mechanical or hydraulic excavator thumb?
Mechanical thumbs are cheaper and simpler and suit occasional use. Hydraulic thumbs adjust from the seat and grip odd shapes, which makes them better for daily sorting and placing.
Can I add a thumb to my excavator later?
Yes, but it usually costs more and takes more work. A hydraulic thumb needs an auxiliary circuit and a mounting bracket, which are simpler to set up when the machine is ordered.
How do I size an excavator thumb?
Match the thumb width to your most used bucket and make sure the thumb and bucket tips meet through the range of motion. Thumbs are specified by machine model and bucket.
Does a hydraulic thumb need auxiliary hydraulics?
Yes. It needs an auxiliary circuit with the correct valve and lines.
What is a progressive link thumb?
A hydraulic thumb with a linkage that keeps its clamping position through more of the bucket's curl, which helps hold long or awkward loads.
Yes, This Is an Ad
An excavator dealer just told you to spend more on the day you buy the excavator. We know. We wrote it anyway because it is true.
Tell us the machine and the work, and we will spec the thumb, bucket and circuit together so it shows up ready to grab things.
Since 1952 we have added a lot of thumbs after the fact. Our customers who did it on day one spent less.
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