1850 vibration

Does anybody have a guess why my 1850 would rumble and vibrate when I'm running it on a sidehill? That's the only time it does it. It seems to be the worst if I'm going down hill at a tilted angle,but still does it on just a straight sidehill. It smoothes out when it's back on the level. The balancer is OK. I put a new drive chain and sprockets on it a year ago last fall. The rear motor mount bolts are tight. The front mount is worn and I had to shim it up to keep the PTO shaft straight in the hub like Smitty told me to do after I wore the splines out of the hub and off a nearly new shaft.
I just can't figure out why it only does it when it's leaning. Trouble is,it's not something I can replicate right here in the yard. I about have to be working it.

Reading your post gave me a memory flashback. Forty years ago I had a Super 88 that was my main tractor at the time. At one point a rear axle bearing went bad. My recollection, (it was a long time ago) is that as it got worse the noise was worse on side hills. That tractor had a hump on the floor plate, and by the time I figured out what was going on, there was enough play that the big gear under the hump had wore a hole in it and we had to weld a patch on it. I'm sure other people will have better possibilities for what's wrong, this is what occurred to me on seeing your problem.

Will it do it with no load behind coasting down the side of the hill? Does engine RPM become a factor? Reading the other answer we had some axle bearings fail. The later ones had larger bearings. What is the serial number? Does this have a hydra-power or an over under?

I put mine back together once and forgot to tighten the bolt under the hydrapower sure was vibrating until I tightened that up.

Has hydra power 2 speed. I never pushed the clutch in and let it coast to find out. Noticed it cutting hay and picking corn,both working and traveling headlands with the PTO off. I'd have to go out in the rain to check the serial number. I'll be going out in a few hours to feed. I know it's a 1966 model though,if that gives you an idea of the serial.

Engine RPM,forgot that one. Don't know. It's at full throttle working in the field when it happens. Hard time believing its a bearing in the axle. It's not a grinding,doesn't make any knock from side to side,no evidence that the axle is moving from side to side. I can feel the vibration right through my feet when it happens. It's not the same rumble that the 1550 had when the drive chain coupler was coming apart. When that lost some rollers,I could see the radiator cap shaking. This is just as if the harmonic balancer was loose. I've been grinding feed with it all winter and no trace of the noise or vibration just sitting and running the grinder at full throttle.
I'd just hate to get this thing in the field in a few weeks and find out the hard way.

Serial is 168-683 I think. Could be 633. It was kinda dark in there and I didn't have my glasses.

I had a loose rim on my 1850 that did that exact same thing while pulling a disk on a side hill & headed down at a angle. The lock nuts for the rim looked OK from a distance but it wasn?t until one of them actually backed out and when I tightened it and checked the rest, all were loose. Frustrating easy fix.

If this were my tractor I would replace the trans/finals oil filter, then cut the old one open and check for metal. Also I would attach a pressure gauge to the this oil circuit. Maybe you?re low on oil and starving a bearing on a hard side hill pull.

Good luck.

Wheels are tight,oil's right up there to the check hole. This is a vibration.
I know things aren't great on the inside of it. Several years ago,the cotter pin that holds the pump drive gear to that short shaft in the top of the transmission came out. It let the shaft slide out and drop down at an angle. I heard the noise,but it sounded like a relief valve in the hydraulics. By the time I shut it down when the smoke started coming out around the shift boot,it had galled out the hole where one of the bearings goes. I had to do some welding to get everything close to being right in there,but those shavings and the needles out of those little bearings went in to everything. I worked for quite a while getting all that mess out of there. Had to change the filter a few times. I dare say if I cut the filter open now,I'd have a few remnants of that disaster yet.
I have to wonder if something from that incident is finally doing a job on something in there. I just can't figure out why it's only doing it when it leans though. It's practically a rumble that you'd almost think was coming from the engine and radiating back through the whole drive train.

Thanks for the cotter pin info, I added a note to check this in my manual.

How are the brakes on this tractor? Did a disc break or warp and is causing a chatter or vibration that radiates through the drive train? Have you applied the brakes when the vibration occurs to see if the noise increases or not? Maybe something came loose and dropped into the brake discs?

I hope this issue is simple and external.

I just got back from the dealer. Wasn't much hesitation when I asked about it. He said probably the spider gears. He thought when it leaned,it put more pressure on them causing the rumble. He got real confident of it when I told him about all the metal that went through it when that shaft dropped out.

I would think that the spiders would really talk to you only when turning under a load. Hard to turn down the experience & knowlege that the dealers accumulate over the years. Thinking about this, I've actually had broken bull gear teeth go through the spiders and still saved them. They were nicked & dented but I still used them and are still hanging in there. I'm still having trouble with that diagnosis, did the dealer mean the bull pinions?

Good luck!

I told him the pinions didn't look good when I had it apart to put a pump in it. He stuck with the spider diagnosis. I just bought a 2-105 from him today,so I'm not going to be in any hurry to tear in to the 1850 to find out. Not as long as it'll move under its own power and run the grinder mixer anyway.

If your traveling in high gear and back out of the throttle will the vibration occur? The spider gears inside the differential aren't even turning or barely turning when going straight. Yes they turn with the ring gear but only as an assembly. If you turn from side to side or have differences in tire sizes would be the only time when they would be turning inside. I would take the tractor out and experiment with it riding the brakes, turning, and throttling up and down at road speed. Sounds like your issue is on the coast side of the gearing only.

Now that I bought that 2-105,maybe I'll just hook the 1850 to the grinder mixer and weld the draw pin in it.