Combines rotor speed won t increase

I also have a 1981 model 1460 combine. I have had the same problem twice. Once it was just the wire from the limit switch had become disconnected and the other time the power window type drive motor had open circuited and had to be replaced.

I dont know anything about 1460's but if it was my machine and it had adjustment up to 650 rpm then i'd first think someone has knocked the rotor drive gearbox into low gear

check ur limit switchs first then check if motor is working..has for changing rotor belt if it is not slipping or giving problems don't

ihman, If you do change your rotor belt get out your owners manual and follow the directions exactly. Do not try to take any short cuts, it could cause you a lot of problems. It's really not as bad as it looks. Good luck! K.A.

Our 1640 seems to have the same problem. I'm pretty sure that I just need to clean the threads on the rotor adjustment. It seems as if the motor stops short of the limit switches. If you change rotor belts I'd listen to the guy that said follow the instructions. I changed ours on the 1440 we used to have, wasn't to bad - about 3-5 hours depending on how it goes. But I would not rush the job. You should also check the splines and other areas around the rotor belt, its a lot easier to do it with the belt off.

I agree with the one person who said to check and see if your gearbox is in low gear. If not I have a question for you. Every time you start your combine do you run your rotor and fan speeds up and downIJ If not that might be the problem. We have 3 2388's and if we don't do that daily we have found out that they might stick on use. Just a thought. Hope you figure it out.

ihman you should have a plate and 2 all thread bolts that came with your combine to compress your torque sensing spring and watch your fingers but it not a hard job , something else you can do when puting your rotor belt on is to put a second rotor belt on and tie it up out of the way while you have your drive shaft,rotor limit switches,androtor speed adjusting chain unhooked ,then when you need a another rotor belt you can untie it and slip it on the rotor drive pulleys and get back in the field quicker.Also check your rollers and cam on your torque sensing for wear so your toqure sensing will keep your belt loaded right under load so your belt will last longer.

Be sure the gear teeth on the rotor speed adjustment motor are engaging the gear teeth on the adjustment shaft. Have wrapped a tarp tie-down around the shaft and anchored to the framework to force the gears together... but then, I need to be frugal.

This happened to me on my 1989 1640 this year. The rotor would not adjust lower then 350 or faster than 600. Come to find out the motor that adjusts rotor speed was good and all the teeth were on the adjusting screw. I had to take the U-joint off and nut that holds the big adjusting screw on and take it to the workbench and clean and lube it up. Works great now, must have been dirt and chaff in the threats. Not that easy of a job due to limited space but was cheap because I didn't have to buy any parts.

I also had the same problem with a 1460 the rotor would adjust but not to the limits. It was in the threads. They looked pretty clean but after I took it apart and cleaned them up good it worked better and fastter then it had for a long time.