How to Change a Spring

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2 pair's of pro-jump bocks m100 & m70
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08/07/2009 07:23 pm
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[Jason]

Recently a few people have asked me what the easiest way to change the spring on a set of bocks so i thought it was time for a How To

The problem is changing the spring without removing the kneebar/Cuffs (as it ruins the settings if you do)

You will need either two 13mm spanners and two 10mm spanners or one of each size spanner and a small socket set with 13mm and 10mm sockets

So first undo the big bolt at the top of the hoof as shown in pic below

[Jason]

This allows you to swing the whole spring back so you can access the lower nut on the top bracket without removing the Kneebar/Cuff (top pic)
Now undo the two nuts and bolts that attach the spring to the top bracket (lower pic)

[Jason]

You should now be left with the spring with a hoof attached as below if you are just swapping the springs side for side (to even wear) this is as far as you need to go as if you leave the hoof on it also swaps the hoof rubbers as well and evens up the wear on them

I tend to swap my springs round every 2 months or so as we all have a dominant foot and so wear one spring more than the other I have found that swapping them makes them last longer

[Jason]

If you are replacing the spring completely you now need to remove the hoof
There are two ways to do this so first I'll show the way that keeps the top bearing in place (handy if you have glued your bearings in place)

Undo the bolt throught the bottom hoof bearing (first pic)
This is where you can do it in two ways

A)--This should allow you to move the hoof away from the spring so you can get to the nuts
      that hold the lower bracket in place (Middle pic)
      (If it is to tight to do this you may need to remove the white packer at the top hoof
      bearing to loosen it)
      Now you can withdraw the spring without disturbing the bearing (lower pic)

B)--Alternatively if you don't mind removing the top hoof bearing you don't need to remove
     the bottom bracket but if you are changing the spring it will have to come off anyway

[Jason]

Assemly is the reverse of the above but I will run throught it anyway

Slide the spring into the hoof section and attach the lower bracket with the two bolts, nuts and spring washers

[Jason]

Attach the lower bracket to the hoof with the locking nut, bolt and two washers

[Jason]

Attach the top of the spring to the top bracket with the two bolts, nuts and spring washers

[Jason]

Swing the spring back down and attach the top hoof bearing with locknut, bolt and four washers
Make sure you put the washers in the right places as shown in the pic

[Jason]

Thats it folks just don't forget to replace the white packers if you took them out

Jason 

[sprog]

Damn, I was meant to do one of these when I switched my raptors over to T-Rex's on Wednesday... was so excited I forgot

Just to add though Jason, you don't need to take the hoof off, just undo the bolt holding on the lower bracket, then the 2 smaller bolts holding that to the spring. Then undo the 2 smaller bolts holding the spring to the bracket at the top, slide down a little and it will come out the top bracket. Then just slide it up and they'll come out the hoof section without having to take the hoof off. You'll end up with something that looks like this.

[Jason]

Hi Sprog

Yes I did it like that a couple of times mate and I agree it is easier to remove the spring that way but I found that the time I spent trying to get the spring washer and locknut back on to the lower bolt on the top bracket without dropping them inside the frame or on the floor it was quicker to undo the one bolt holding the hoof on and get easy access to that one  (size XL fingers don't help either  ) and as most of the time I am rotating the spring/hoof to keep them even I tend to do it that way now

I did change Clives 7's over once and the top bracket and the slot in the frame seem to be deeper and it is an easy job to get the nut on so I can see why you do it that way but the PJ ones are a total pain unless you have small fingers

Jason 

[sprog]

Ah fair enough, whatever works best for whoever then
I've got long thin fingers which is probably why I had no problems dropping nuts inside the frames

[Callum]

that top bolt thats on the first piuc is realy tight on myne struglling to get it off 

[sprog]

Get a ratcheting spanner, it makes life a lot easier

[Locky]

Get Sprog to do it. Much easier.

[Jason]

Yep Callum they can be tight the first time you undo them just make sure your turning it the right way 

Jason 

[sprog]

Yep Callum they can be tight the first time you undo them just make sure your turning it the right way 

Jason 

No, he's gotta make sure he's turning them the LEFT way!

[lynch]

i will be doing this in 2day when my new springs come

[liumingzhu]

You should now be left with the spring with a hoof attached as below if you are just swapping the springs side for side (to even wear) this is as far as you need to go as if you leave the hoof on it also swaps the hoof rubbers as well and evens up the wear on them

I tend to swap my springs round every 2 months or so as we all have a dominant foot and so wear one spring more than the other I have found that swapping them makes them last longer

 

[Jason]

Yep thats what I said liumingzhu 

The time you leave before you swap them depends on how much you use them though

Jason 

[spring_loaded]

Where can i get new springs from?

[Jason]

Projump sell them mate

Jason