Intermittent clanking after shock cord replacement.

[Tees Erg Fairy]

Hi all,

I've recently changed the shock cords on two of our rowing club machines, one a Model C, the other an original D. Both definitely have the shock cord routed correctly, but make the kind of clanking noise at start of the drive usually created by a mis-routing issue....BUT....they both only do it intermittently and look fine on inspection - the C is doing it more often than the D, just for a few strokes at a time then they go quiet again.

The ergs are kept in an unheated boathouse gym, and the weather has got a good few degrees milder than when I did the original cord change. Is it possible the shock cords simply need re-adjusting? Or is there something else that might be the answer?

Thanks!

[aussieluke]

have you checked the ends of the shock cord that stick out past where they're locked into the metal ends are not interfering with anything?

I think the ones on mine were a little bit when I was inspecting the inside of my machine.

One of them was catching something just enough to cause a little sticky spot in the movement.

[jamesg]

Have you tried hitting the lock system with a heavy hammer? I usually see it move if it was slack.

[Tees Erg Fairy]

Thanks aussieluke, will try that.

jamesg, which bit do you mean please?

[jamesg]

Under the rail at the join there's an eccentric half disc, which when tightened locks the two parts of the machine together. If it's slack, I hear a click at every catch.

[jackarabit]

The original model D has the eccentric in the frame lock. The mechanism and operation of the frame lock of the earlier model C resembles that of the "revised" model D without the rotating wedge. OP has both a C and an "original" D at his gym. So one machine (the original design model D) has the rotating wedge and the other (the C) does not. There might be a common cause for the noise in both machines but it will not hinge on (pun) the snugging up of a rotating wedge in a model C which doesn't have one.