Combines 750 seperator belt

[Silver750]

Forgot to add that concave clearance is set at 1_2" on the front and 3_8 in back. I am thinking about going to 5_8 in front and 1_2 in back. Would that helpIJ Bean moisture is 11%.

 

[Mighty_Fine]

I run a 850, 1_8" in back and n 3 on the front concave setting, I have been cutting green soys up to 55 - 60 _ acre, I would suspect worn cylinder bars and or concave, if they are bad it will take twice the horsepower to do the job, take a look, good luck

 

[silver750]

Thanks for the reply. The bars are in good shape less than 300 hrs. The concave has 2800 hrs. on it. I talked to a friend at the mill yeaterday and he sugested tightening up the concave. Since you are running yours tighter than I am maybe that the way I should go. I also run a John Deere 105 diesel and if I tightened it up to where I am at on the Massey it would never work. But then thats a different machine so that doesn't apply. I will try pulling it up tighter and see what happens.

 

[cookie_jar]

I've got more question than answers. When things slow down, does you engine load down too, or is it just the cylinder speedIJ How about the rest of the combine, does it also slow downIJ

 

[silver750]

The beater shaft slows, in turn slowing the whole machine. The beater shaft is driven by the main seperator belt. The high idle on the motor is set at 2550. It will pull the motor down to 2450 and hold there. the motor turns 3.541 revolutions for each turn of the beater shaft. losing 100 rpms on the motor would equal losing 28 rpms on the beater shaft, but I am losing 80 to 90 rpms at the beater. I am going to order a new seperator belt as I have decided that is the problem.

 

[Kornkurt]

I think your problem is your concave setting. I used to run the rear @ 1_8", but for the last few years have been setting it just so it ticks, the back it off slightly. We set the front 2 or 3 notches onen on the lever. We are running a Grey Cab 750 with a 20ft 9120 head @ 4mph in 50+ beans and it works great. The combine has 3100 hrs with around 300 hrs on the cylinder bars. I think with your concave set as wide as it is your cylinder can not pull the material through and is having to work too hard. I hope you will try this before you go to the expense of a new belt. Hope to hear from you in how it turns out.

 

[Mlappin]

We had a similiar problem on our 8560, the rotor hydro belt would slip if the idler pulley was not kept adlusted. After awhile it would get glazed enough that it would slip no matter how tight it was. Only cure was to change it.

 

[korn_fed]

reading in my 750 manual it says more belts are ruined by being run too loose than too tight, but do not overtighten as this weakens belt. Don't recommend belt dressing, but that's coming from someone that sells belts...

 

[Countryboy]

I know that it's a bit late for tough soybeans but I would suspect worn pulleys and or belts. As for belt dressing, I wouldn't use it. An old Massey dealer told us not to use it. Instead he said to use castor oil. Apply a few smears on a warm belt and then let the machine run a few minutes to spread out the oil. We had trouble with the cylinder drive belt slipping. After applying the oil we pulled it in two. lOl