KX040-4 vs KX 121-3

jeffthogmartin

New member
Jul 31, 2026
3
0
1
TN
Hi i Need some advice for my first excavator purchase.

I am looking at purchasing a used mini ex and I am torn between two models at a local dealer.

2020 Kx040-4

&

2012 Kx 121-3

They are nearly identical in hours, both abround 1800-1900hrs, both are tight machines in good condition, both have quick couplers both are open canopy machines and both are around the same price.

The 121-3 has a 6 way blade and the 040-4 has 4 way (the blade doesn't matter much to me tho)

I will be using it for development of my 17.5acre mountain property in tn. Things like installing septic, digging trenches for drainage, moving rocks, clearing timbers, collecting firewood digging out for additional outbuildings etc.

I am torn between the two machines bc my gut is leaning toward the older 121-3 due to no emissions and dpf and more sinple to fix myself should I have to ( I am reasonably handy). But my logical brain is saying to buy the newer machine bc it's 8 years less wear on all the components.

What do you all think? Anyone have any input? If I were to resell in 5-8 years which would be easier to resell? Any and all advice/help is welcome and greatly appreciated🙂
 

JasonW

Well-known member
Jan 29, 2015
800
554
93
Al
If the hours are similar the wear and tear should be similar if equal taken care up.

I’d vote towards the 121 due to the 6 way blade.

Does either one have a thumb?
 

Runs With Scissors

Well-known member

Equipment
L2501 TLB , Grappel, Brush Hog, Box Blade, Ballast box, Forks, Tiller, PH digger
Jan 25, 2023
3,922
5,280
113
Michigan
Given the fact they are so close in almost every way, I would personally go for the older one.

I am also a DIY’er and work on my own stuff (almost to a fault); So the less computer/emissions stuff, the better in my opinion.

Full disclosure, I have never owned, worked on, nor sat in any of those machines. My opinion is just from a "general viewpoint”.

I tend to like simpler’er machines in general….As a matter of fact, it is the reason I decided to get a 2501 instead of a higher HP machine, and I still drive my 21 year old Cummins 5.9l.

Did you take any pics of them you could post?

Thats my .02…Good luck sir (y) (y)
 

jeffthogmartin

New member
Jul 31, 2026
3
0
1
TN
Given the fact they are so close in almost every way, I would personally go for the older one.

I am also a DIY’er and work on my own stuff (almost to a fault); So the less computer/emissions stuff, the better in my opinion.

Full disclosure, I have never owned, worked on, nor sat in any of those machines. My opinion is just from a "general viewpoint”.

I tend to like simpler’er machines in general….As a matter of fact, it is the reason I decided to get a 2501 instead of a higher HP machine, and I still drive my 21 year old Cummins 5.9l.

Did you take any pics of them you could post?

Thats my .02…Good luck sir (y) (y)
Thanks for your reply! This is exactly my train of thought just helps to have others opinions as the world of excavators is new to me.

I do not have any pics but here are the listings if you'd like to check them out.



Thanks again!
 

Bee-Positive

Well-known member

Equipment
BX1880, Cab, FEL, Tooth Bar, MMM, QH, Ballast Box
Nov 16, 2022
1,005
949
113
Amsterdam, NY
The KX040-4 looks like it's been left out and beat up a bit. May not affect the mechanical soundness but is that an indicator of how it was treated? Just an observation.
 

L35

Well-known member

Equipment
L35/TL720/BT900/York rake/Valby chipper
Jun 13, 2010
705
827
93
CT
I guess the only downfall to the older unit is end of life (Kubota supported) components will come up sooner.

With the newer if emissions are a concern that can be dealt with through the aftermarket.
 

JasonW

Well-known member
Jan 29, 2015
800
554
93
Al
If the blade doesn’t matter for what you need you can find an older model with the 4 way blade cheaper.
That said if the 6 way blade model is still available in a few months I’m seriously considering making the trip and buying it.
 

Runs With Scissors

Well-known member

Equipment
L2501 TLB , Grappel, Brush Hog, Box Blade, Ballast box, Forks, Tiller, PH digger
Jan 25, 2023
3,922
5,280
113
Michigan
Along the lines of what @Bee-Positive was eluding to, I also question why a 6 year old model is sellling for the same price as a 14 year old model?

Is there some difference(s) that I am not aware of???? Could be….I have never shopped for one.

There is too much that I don’t understand to give an “informed opinion” though.

I just tend to like “older and simpler” I guess, but that may not be a “plus” for some people as @L35 mentioned about parts.

🤷‍♂️ ………..wish I could be of more help.

Good luck!
 

L35

Well-known member

Equipment
L35/TL720/BT900/York rake/Valby chipper
Jun 13, 2010
705
827
93
CT
Along the lines of what @Bee-Positive was eluding to, I also question why a 6 year old model is sellling for the same price as a 14 year old model?

Is there some difference(s) that I am not aware of???? Could be….I have never shopped for one.

There is too much that I don’t understand to give an “informed opinion” though.

I just tend to like “older and simpler” I guess, but that may not be a “plus” for some people as @L35 mentioned about parts.

🤷‍♂️ ………..wish I could be of more help.

Good luck!
Older low hour machines in good shape demand a premium because of lack of complexity.