LEGO 42043 slow pneumatics

[DzieX]

Hi
Does yours is also that slow?

https://www.youtube.com/watch?v=e4bTuELbwr0a

I bought it second handed - it wasn't used for a while. I appreciate any advice on that :)

Edited September 24 by DzieX

[Jurss]

Looks pretty OK. I forgot allready, how fast it was.

You can try to check cilinders separately, maybe some are stiffer. With time they tend to stick, move slower.

[msk6003]

There may be a problem with the pump. The older pump in the first image had a defect that caused air to leak from the bottom connection, so it was replaced with the pump in the second image.

   

[DzieX]

Hmm, might be - meanwhile I've tested cylinders by plugging them directly to pump. They don't work fast. I'm pretty sure there's no leakage on cilinders/pipes as an arm stays in position when left with the pressure inside.

4 hours ago, Jurss said:

You can try to check cilinders separately, maybe some are stiffer. With time they tend to stick, move slower.

That's my first pneumatic technic set - I have no comparison to others. Do you have any YT videos which show how it should work? I don't only mean this set, but cilinders itself.

[Jurss]

 

[DzieX]

@Jurss thank you. I guess, I'll start with new, improved pump, but I'm also thinking about put some silicon spray gear in cilinders

[Johnny1360]

Sometimes the cylinders become a bit slow, I often find if I just physically run them in and out through their full range of motion a few times, they will work a little more smoothly and a bit faster.

[DzieX]

5 hours ago, Johnny1360 said:

I often find if I just physically run them in and out through their full range of motion a few times, they will work a little more smoothly and a bit faster.

I did that. It's slightly better, but not ideally

Edited September 25 by DzieX

[Jurss]

What about batteries, are they fresh?

 

[DzieX]

Eneloop Black AA freshly charged

[Jurss]

If not mistaken, accu standard voltage is 1.2 not 1.5, as for standard AA batteries. Maybe check with fresh standard batteries.

[DzieX]

10 hours ago, Jurss said:

If not mistaken, accu standard voltage is 1.2 not 1.5, as for standard AA batteries. Maybe check with fresh standard batteries.

I will, thank you. But.. this eneloop charges up to 1.5V.

[DzieX]

On 9/24/2025 at 9:55 AM, msk6003 said:

There may be a problem with the pump. The older pump in the first image had a defect that caused air to leak from the bottom connection, so it was replaced with the pump in the second image.

   

Came up it's most possible explanation. I've firstly tested new batteries with no result. After that I decided to dismount and open all cilinders, but i didn't help. Finally I've dissasembled truck apart to modules, took gearbox and removed the pump. Here's how it look.

Looks like characteristic breaks. Sent an email to LEGO. I'm curious if they can help with that.

Edited September 30 by DzieX

[DzieX]

I've tested it with pump from set 42008 which I bought meanwhile - works much faster. In meantime LEGO responded, that they sent me new improved pump for free :)

 

Edited October 6 by DzieX