My tractor GC2610 makes a clacking sound to the left rear wheel, and sometimes to the right wheel.

OK so it's your CV axle most likely during slow revolutions it clacks and makes noises so replace both sides to ensure transmission/engine performance stays optimal to power applied to the road. The other cause of noises in that area are due to the wheel bearings needing replaced usually and sometimes repacking the bearings instead. On your car if the axle passes through the wheel it has to ride on something to control balance and torque across the drive shaft. I would replace both front driver and passenger side wheel bearings and the CV axles on both sides please be smart people and replace parts like these in pairs/ together the reason being after you replace one side you drive a few months or less and the other side goes out almost always soon after the other I would say over 75% of the time let it be bearings/u-joints/CV axles or other crucial parts. Hope this helps please take my word and fix it right the first time and please buy the better parts not the cheapest parts out there if you want quality/ safety than buy the better or best parts never just the good or OK parts

cv axles going bad?wheel bearing? but you said clicking so i would say cv axles, if its manual check trans fluid, humming can also be the alternator increasing sound with speed overinflated tires etc be a little more descriptive click click? tock tock? clack clack?left side? right side? only when turning? is the licking and the hummming together or seperate

If you hear a clacking sound esp. while turning. Sound like your CV joints (constant velocity) or Front Wheel Drive axle.

well i hope he is.. cause there are many thing that will cause that, for example the grinding noise from the transmission is a broken gear in the Gear box. (transmission).. The only way to be sure is to actually observe it our selves which we cant. In this case i would advise you trust the tech and if needed get a second opinion. However if you can answer these question we should be able to help.

is there any other sounds or vibrations while driving ??
where is the sound coming from ?? (what part of the car like left side front wheel)..

does the rims get hot ??
is there a clacking sound while turning left or right hard.
is the noise constant and increases with speed ? (if its this one chances are its a wheel bearing)

sounds like wheel bearing to me

here is a small set of brake shoes inside the rotor which is used for the parking brake which should be checked as well. It is simple and straight forward setup. Also check the wheel bearing by grasping the wheel with the car jacked up. There shd be absolutely no play at all.

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If its a rapid clack time then it could be the battery terminals need to be cleaned, it could also be the starter solenoid mounted on the fire wall has loose nuts corroded or the ignition wire from the key switch the round connector can wear out and not make contact. So check those things first if you have a test light I can give you the procedure to test the cables and solenoid.

Try checking the bearing in the left wheel if the rumbling is on the left side. Sometimes bearings can be worn down and sometimes may even twist or bend.

A clacking or popping noise on turns means one of the CV joints is bad. A scraping sound means you need to oil the steering wheel support bearing, or maybe something like loose change fell between the steering shaft and collum.

If the clacking noise gets louder when turning its the drive joints at the front wheels