As a matter of fact since Deere has come out with the Heave Duty and the Super High Capacity both with oil coolers we have only had to go into TWO of them and we have about 100 combines out with the two reversers on them. When we inspect the machines weather they have run over 100 acres or 10,000 acres we change the reverser oil and flush out the cooler every season. The only reason the two went out is because the input shaft seal started to leak and then eventually went out. In the hills we run around here in Northeast Nebraska when that side of the machine was down hill it was pumping oil out the seal. We ALWAYS use the heavy duty synthetic reverser oil in them all. Even down to the 20 series.
We do however have some issues with the lower sheaves but that has to do alot with maintenance. We suggest that they grease the sheaves TWICE a day with either the synthetic grease or the SD Polyurea grease and make sure they speed them up and slow them down to distribute the grease.
i agree, we have very few problems with reversers, especially the new high torque units.
you can grease the sheaves 10 times a day, but if you don't work the sheaves through the speed range, it does no good