|
Elmer, The geartrain noise in your Super 77 is perfectly normal, and although it may be a bit more pronounced now in the machine's later years, they had the same noise the day they rolled off the assemlby line. Oliver tractors, with the exception of the Super 55/550 etc. used selective spur gear transmissions, which are inherently noisy because of the great clearance between the gear teeth. As the teeth mesh (at high speed), the teeth contact one another and act like tuning forks. Listen next time your in road gear of pulling a good load, they sound a lot like tuning fork. With the introduction of the 880, Oliver began using helical gear transmissions in this and most later models. This was a vast improvement because helical gears are much tighter meshing, not to mention stronger, than the old spur gears. But that old sliding spur gear transmission sure shifts on the go nice compared to the constant-mesh helical transmissions so the noise is offset a bit by this advantage. Eventually the noise probably will grow on you as one of those Oliver characteristicsl, almost as beautiful as that smooth 6 cylinder engine.
|
