8439 Pneumatics Questions

[Maaboo the Witch]

Hello again Eurobricks! I got 8439 recently - brilliant set, a total challenge to build and a great end result. However, I've noticed that the pneumatic valve that controls the loader's bucket lifting arms lifts the arms in the wrong direction corresponding to the stickers on either side. When pressed to go up, the arms go down, and vice versa.

I've attached all the hoses correctly, and I just have no idea what's going on! I have seen videos on YouTube where the valves seem to make up their own mind which way they go, but what's up with that?

Can someone shed light on this issue, please?

[DrJB]

can you simply swap the hoses on the valve (not the middle one), and see what happens ?

[Alasdair Ryan]

Yeb just switch the hoses around, you must of made a mistake while building it.

[Maaboo the Witch]

can you simply swap the hoses on the valve (not the middle one), and see what happens ?

Could try.

[Rockbrick]

I had the same issue I think the instructions are wrong so I swapped the hoses round (not the middle one) and all was OK

[Maaboo the Witch]

Yeb just switch the hoses around, you must of made a mistake while building it.

I really didn't. I've checked the hoses and they're all correct. Are the instructions wrong on where to put the stickers?

I had the same issue I think the instructions are wrong so I swapped the hoses round (not the middle one) and all was OK

I just said that... looks like they are indeed!

[Lakop]

Its all good experience.

H

[Rockbrick]

perhaps the instructions are a bit easily misunderstood on that section - no big deal and getting things wrong makes you learn how the system works

and helps learning....