I have a 7720 combine with a clicking sound coming from what I think is the transmission. It seems to be getting louder. The faster I drive the faster the clicking sound. The sound is not synchronized with the output shafts of the transmission. Does anyone have any ideas what this may be or maybe a similar experience?
Could it be one of the final drives? Maybe lift drive wheels off floor and have someone spin it over while you observe. But be careful and never put yourself in danger. Put your cellphone on a selfie stick to hold under there if anything.
On a transmission, this could mean worn or damaged teeth on a:
countergear or cluster gear assembly
output shaft gear
On a transaxle, this could mean damaged teeth on the:
input shaft gear
Worn gears may not represent a real or immediate problem. However, if a broken piece is moving around between gears and other components, it can cause more damage.
After spending most of yesterday trying to figure out a plan of action when we need to be harvesting I decided to run it. As with a lot of decisions in ag I won't know if that is right or wrong until later. I ran it today. When I quit tonight I pulled the plug and drained the oil out of the transmission. I was a little surprised that the oil looked good and there were no filings or contamination that came out.
