Wednesday, September 1, 2010

8043 Motorized Excavator re-listed at

After some mal-function costumer complains, the new LEGO Motorized Excavator (8043) went back to the designers desk for investigations and problem solving [1] [2]. As consequence it became meanwhile unavailable from LEGO normal distribution channels.

Now it was relisted at for backordering, with expected shipping date of 2010.Oct.29.
US store says "Backorders Accepted, will ship in 30 days", though.

Quite impressive fast reaction from TLG. Well done!


Xander Soldaat said...

I wonder what they fixed. Is this known yet?

TechnicBRICKs said...

Several references in the net, point to a fix on the Linear Actuators.
Maybe an improved screw grade or another general quality production improvement!?

No concrete information available though, AFAIK.

Anonymous said...

I hope they included a proper fix for the right track, I found the source of the problem last night but fixing it would require taking most of it apart. The problem is a gear which is fixed on with a frictionless axle pin, and because it's upside down, the gear slips off with use. It is just far enough inside the model that I can't reach it without dismantling.

Anonymous said...

I know the problem, it's this right?

That gear is sliding down of the axle it's on. An easy way to fix it is smply to place a beam under it.

A little better solution is to use this part under it:
Replace the 16z for a 16z with clutch and use a 3 long axle with stop to connect it. This way the yellow beam on top of it also has an extra connection pont.

Victor Kojenov said...

They also relisted the Crane Truck (the big red one)

Alex Campos said...

The only explanation I find for the earlier US availability date is that the new LA's are manufactured there; but I've never heard of anything LEGO (maybe excepting boxes and instructions) being manufactured in the US.

Anonymous said...

One of the problems this model is having is also related to the studless design. The frame is not stiff enough and the torsion of the frame introduces a lot of friction for the transmission which stalls the motors.

Jurgen Krooshoop said...

I suggested this right-track-solution (which was included in my Ultimate 8043-instructions) to TLG last week and they replied that it might be usefull for other people as well. So maybe TLG will include it in their "service-pack".

JAMS said...

General rule of thumb:

If your model has power functions, do NOT EVER USE frictionless axle pins.

I thought this was common sense by now, Lego....

TechnicBRICKs said...


Can you explain a bit a further?

Alex Campos said...

I noticed that too on a MOC I showed at an exhibition two years ago: gears held only by frictionless axle pins will come off with use, especially if they're "upside down" like in the picture Anonymous posted. The solution is to put something blocking the gear from coming off, using an axle supported from both sides of the gear (replacing the axle pin), or, better yet, both methods,

TechnicBRICKs said...

Would a friction axle pin make any difference?

Is there any friction difference among them, on the axle side?

Alex Campos said...

I guess it would only have any difference if the plastic used were different, as I don't see any reason to make the axle halves different.

Another option to reduce friction even more, which has been discussed at EuroBricks, is to replace the normal 16T gear with its clutch version.

Let's see what other improvements this patch brings us, besides new LA's... with such an extensive testing by early buyers and the need for LEGO to release a service pack, this is a good opportunity to also include some fan-developed improvements.

JAMS said...


What I meant was, that, if you're implementing the PF motors in a model, then you can't really use the frictionless axle pin to place your gears.

With all the torque these motors produce, its verrrrry easy for gears to wiggle off of these parts.

I would have assumed they would have framed those 16z gears with liftarms on both sides to completely secure those gears from moving around on you.

Better to build it redundantly strong than to have mishaps like what's going on in here:

That's all I meant, it just surprised me to see this.

Technic Fan said...

The issue with the frictionless axle pin is an easy fix...

Substitute the tan coloured one with one of the old grey versions of the same part - they grip onto the 16t gear very well.

Further explanation can be found on my comment (I think comment 18 - reply to Jason Sliss)

Technic Fan said...

...also, this removes the need to add in extra beams etc. to hold the gear in place.

Worked a treat on my 8265 which had the same issue.

Jurgen Krooshoop said...

An Axle pin with friction wouldn't make a difference and since is has more friction, you lose more motor-power. And I'm not a fan of using the old grey one instead, because the gear still isn't fixed. It doesn't solve the problem.

Technic Fan said...

You've misunderstood me Jurgen.

The pin side has no friction, it spins freely, it is what was used for free spinning wheels back in the 80's. It is the axle side of it which the gear grips tightly onto.

I have had success using this and I have also tried atleast 20 of these grey frictionless axle pins with as many 16T gears and they all fit tightly whilst freely spinning in the studless beam.

TechnicBRICKs said...

Now another question bugging me.

How does this axle/pin issue slows down the right track?
In my understanding either it runs at the intended speed, or it stops if the gear slides off!?

Alex Campos said...

I guess that would happen because of lateral forces applied to the gear: the more away it is from its mount (the pin side of the axle pin), the greater the lateral force on the mount, and therefore more friction.

This is the same reason why wheels should be mounted as close to their supports as possible, and even better if they're supported from both sides.

Anonymous said...

TF: as far as i remember, grey ones suffered from same problem in this aplication, only on other side - were pulled out from beams

Unknown said...


I wrote to TLG. And they gave me 15 € credit for their online-shop and I was set on a list for the new designed part, which will probably released in early october.


minks502 said...

to solve the problem of the gear slipping off I took my 16 toothe gears and shaved them down to 1/2 stud length then I took a 4L axel with stop and cut it down to 2L then secured the gears together on the bottom with the 6-holed wheel. I've had no problems with it.

Anonymous said...

I just placed a order on and it seems I received a 17% discount when I bought any eight Power Functions items. I don't know if this offer is available to all countries but it is available to United States, at least.

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