SteveM
Gold Member
Please forgive me for posting down here, but you folks on the Yanmar forum are much more mechanically inclined than the people on the major brand boards above....I have just purchased an early 80s kubota 4wd 7100, very similar to a Yanmar 1500 or 1700...perhaps you can help....
My new to me forlorn B7100 has a strange gear noise in 3rd (the highest) gear only- a chunga chunga vibration that varies with RPM. It happens in either range, and being in or out of 4wd has no effect. It pulls a load and drives fine in this gear.
The other 2 gears and reverse are silent, except for the normal gear whine in reverse. Every tractor I have had has made certain gear noises in the highest gear, but not this pronounced. I have not changed the gear case oil, but it is full from the previous owner. Any ideas? Anyone experiment with heavier grade gear oil to quiet noisy gears? I see the Chinese tractor owners have done that...
My new to me forlorn B7100 has a strange gear noise in 3rd (the highest) gear only- a chunga chunga vibration that varies with RPM. It happens in either range, and being in or out of 4wd has no effect. It pulls a load and drives fine in this gear.
The other 2 gears and reverse are silent, except for the normal gear whine in reverse. Every tractor I have had has made certain gear noises in the highest gear, but not this pronounced. I have not changed the gear case oil, but it is full from the previous owner. Any ideas? Anyone experiment with heavier grade gear oil to quiet noisy gears? I see the Chinese tractor owners have done that...