suspension problem video
The ball joint pin keeps popping out even it is not loose.

What should I do? What would the problem be?

Btw, how do I insert a youtube video here? (I'm a newbie )

Edited July 9, 20177 yr by move5

If you want to keep your suspension geometry as it is now, you have to connect the spring to the upper wishbone. Sometimes, the force, that is required to disassemble a lego connection, is smaller than the force that occurs while operating a mechanism. In your case, the spring disassembles the ball joint. If both wishbones were parallel and in equal length, you could simply add a vertical link to brace the connection, as it is in most official lego suspensions.

The problem is that the shock absorber is mounted onto the lower wishbone, what means that all the effort of the wheel goes into separating that pin connection. there are two solution:

1. add a vertical connection between top wishbone and lower wishbone (look at the front suspension of 42037, there the 5l liftarms hold both wishbones together) this would require removing the kingpin inclination to make both wishbones equal length
2. make a custom hub with the lower wishbone pin pointing down. this way the suspension won't be able to separate that connection because the movement force will be pushing the pin into the hub.

I recommend looking into the Axle collection thread

about the video: just paste the url , it should insert itself automatically.

Edited July 9, 20177 yr by LXF

27 minutes ago, move5 said:

The ball joint pin keeps popping out even it is not loose.

What should I do? What would the problem be?

It's simple, just connect the shock absorber to the top suspension arm.

29 minutes ago, move5 said:

how do I insert a youtube video here?

Just paste the link into the post directly (without using the link button).

Like this:

 

Thanks everyone 

I'll try them and see if they work.

If you're using that wheel hub, then spring attached to the top arm gives you more options if you wish to use different length suspension arms.