It's time to clean and lubricate your counter's axle drive when it starts to make a lot of noise. It's much more common for the axle drive to wear out than for problems to occur with the Veeder-Root counter. The old metal axle drives are becoming very scarce, and maintaining them adds years to their lifespan.
A common problem with the Jones/Oerth counter is the failure of the glue binding the Veeder-Root counter to the plastic connector. I've found that Shoe Goo and other similar liquid sole compounds work very well. Put a small amount of glue on the outside edge of the connector where it comes into contact with the Veeder-Root, being careful to avoid the center hole where it can gum up the the Veeder-Root's shaft. The apply it liberally to the outside of the Veeder-Root and connector so that it forms a good seal but avoid getting any on the display. Take off the excess so that the counter doesn't get stuck to the surface on which it's drying. The counter is ready for use after about 12 hours.