This is to show you how to remove and replace the
chain drive to the rear roller. First we need to remove the side casing.
This is the final drive of the chain to the rear roller. We have lower upper chains there
are two different types of chains and we've got a two-stage reduction to take engine speed down to
rear roller speed. To remove the chains I need to first reduce the tension on both of these
chains. To remove the tension on the upper chain I need a two 17 millimetre spanners and I need
to remove the tension from the idler. Secondly I need to remove the tension from the lower chain
by moving the position of this intermediate sprocket into a lower position and that will
release the tension there for that I need a 17 millimetre and a 30 millimetre. So now both the
chains are loose to remove the upper chain I need to find the position of the joining link.
So once you've located the joining link get it in a convenient position by rotating
the rear roller and then using long nose pliers you're going to remove the joiner.
So the second part of this as well
The lower chain is a larger grade of chain and the link is exactly the same setup. As
you know these are quite fiddly and so you could do with a good pair of
narrow nose pliers in order to do this.
Once the chains have been removed then we're going to check the condition of the chain. A good new
chain actually has very little sag on it as the bearing surfaces wear so this is a new chain but
as the chain gets older then it will start to sag down so a chain in poor condition you will get
that sag and we also need to just check generally for freedom of movement and that there are no
tight links. We also need to check the condition of the sprockets these sprockets will wear over
time and they will wear more quickly if the chains are allowed to run in a slack condition. Once
we're happy with that then we're going to replace the chains and we may choose to replace our
sprockets and the spare parts numbers appear here. So now we're going to clean the chain and once
we've cleaned the chain we're going to lubricate and replace. So the sprockets are already in their
closest positions just to make this easy and I'm going to make sure that I'm going to put
this in a location where I can easily get the joining link in. So joining link goes in first
Remember the final clip it's important that the direction that this fits in. We know that the
roller looking from this side here is turning anti-clockwise when it's driving and I always
remember this by this looks like a fish and it always swims down water so it always swims in
the direction of the chain. So I'm going to with the sprocket turning in this direction
I'm always going to put it in this location. Once that's secure I know that it's not going to come
off I just need to double check that and then I can put the top chain back on so the top chain
and again if we work out the rotation of this chain if this sprocket is turning in
this direction this sprocket also is turning in this direction then this
will be traveling this way and therefore my fish is going to be swimming downstream. It's
going to work in this location. Make sure that's secure and then nothing can move.