Combines 2388 power rear axel won t push

[Marv]

If I'm not mistaken, I think the rear wheels are supposed to help push, not really spin like the front wheels do. I haven't had a Mud Hog for several years but back when I did the rear wheels wouldn't spin either unless they weren't getting much of a grip on the ground.

 

[wildcat1]

Hmmmm......I figured that they would spin out a least a little. I have a neighbor who has a 1688 and they said when they are going through slippery mud and the combine slows down, the rear tires will start slinging mud. It sure seems like the rear is pushing a little, but it's really hard to tell from the cab. I haven't had anyone else there to drive the combine while I watch yet.

 

[CAJUN__BOY]

all 4wd combines have rear wheel assist not really all wheel drive if your machine slows an speeds up when flipping switch its working but the higher the gear you run more hydro pressure is sent to rear wheel because it takes more power or pressure to turn front wheels if you run in first less pressure sent to rear, second gear more sent to rear we run second high in rice harvest 3-4 mph , are you running R1 or R2s on front and size of tires on front compared to rear the closer in size of front an rear tires makes a lot of difference front tires always has priority, if you want to check on soft ground hold brakes in second gear an push hydro lever to reverse slowly and rear drive should spin, e-mail if you needIJ

 

[wildcat1]

Thanks Cajun, I'll try pushing on the brakes and backing up and see if the rears spin a little. I understand that RWA combines don't push like MFWD tractors do, but I have see other farmers RWA combines sling mud when the going gets tough. (see my post below) This machine has brand new 30.5-32 R1son the front and 18.4-26 R1s (about 80% tread) on the rear.Seems to be really well matched. I'm cutting milo at about 5 to 6 MPH with the RWA on and the trans in second gear and the hydro in the high range. I've been over a lot of damp ground today and never had to back up. It seems like the RWA is helping, but the fact that it stalled out in soft mud on Saturday kinda bothers me. Any other tips are welcome.

 

[FR]

We run Mud Hogs, does your slow down when you engage itIJ 2388s run about 4.3 in and 5.8 out and maybe the reason yours does not throw mud is yours is heavier in the back versus the neighbors machine which could be lighter because of head size, or weight on rear axle, hope this helps.

 

[wildcat1]

Yep.......it slows down when I flip the switch to engage it. The oil going to the hubs is warm too, so I'm sure it's working at least most of the time. The local Case IH shop foreman says it should NOT throw any mud. I have had others tell me that it sould at least be slipping when the drivers are slipping. See my first post...............that pretty well describes what's going on.

 

[FR]

The only other thing I can think of possibly your hydro is weak have dealer check pressure`if every thing is right your drive tires should slip along with rears in 2nd gear not throwing mud, hope you get it figured out, let us know what they find out.

 

[Marv]

The only thing I know is for you to run it in third gear in the mud. It'll throw mud with the rear wheels, then. (I'm joking!)

 

[Deadduck]

Oil, like any fluid, will follow the path of least resistance. This is why running in 2nd gear will send more oil to the rear axle than 1st gear. When your front wheels slip or spin, it takes less pressure to turn them, which actually takes oil pressure away from the rear wheels which have traction. Conversely, if the front tires have good traction, then it requires more pressure to turn them, so more of the oil will redirect to the rear axle, which has less resistance. To try it, lightly apply the brakes in the mud, it will send more pressure to the rear wheels, causing them to spin momentarily. Usually, the rear wheels on our 2388 will throw some mud when turning and holding one brake. Ours will also spin a little when we climb a rice levee with our front wheels. The front wheel will try to stall out, spiking the hydraulic pressure and sending more pressure to the rear axle. As the rear wheels gain traction, pressure will stabilze and crawl on up.

 

[Anteater6788]

We have a Hog with 18.4x26 tires on our 2366 and it will spin the rear tires at times in mud with our 963 corn head on it. With our combine if you get in the inside brake when turning on the ends it will send more power to the rear tires and you can really notice the back end pushing it around. If you get time you could jack up the rear axle and with the parking brake applied if you push the hydro lever forward or backwards it should turn the back tires.