[R-390] test equipment question

[2002tii]

Mike wrote:

>I have 2 of the 8640b and like them How can you tell if the gears 
>are cracked or broken

The gear hubs sometimes crack and you can tell by inspection, as has 
already been mentioned.  Also look at the one large nylon gear -- it 
can shrink enough that it loses proper tooth engagement and can skip 
even if it is not cracked (this is the most common gear fault I have observed).

Best regards,

Don