Posted 11/17/2012 00:34 (#2701544) Subject: Case 7120 rotor problem
We have a problem with our new to us 7120 CIH combine. The rotor will not engage. It doesnt seem like the rotor brake doesnt hold the rotor still. It rotates at 10 rpm with the machine running. When the rotor is put in gear the rotor and fan speed never go up. The pro 600 then gives you an alarm to turn of the rotor. The combine will throw a RTF valve code i believe. Seems to me there is a problem with the control to the rotor drive but i have been around these style mcouples for only a couples. We had a 2388 before. Im stumped and so is the CIH tech that spent all day working on it. He also changed the control mod under the buddy seat along with the rotor speed sensor.
Could really use some help on this one.