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My other tractor - MT running nicely

T

tstex

Member
Gentlemen,

I hope everyone and their families are all doing well.

Wanted to run this by you guys and determine if any of you have run into something like this?

Have a 1996 60HP M5400S Kubota w a frt-end-ldr. The tire specs:

Wheelbase: 78.7 inches [199 cm]

Weight: 4000 lbs [1814 kg]

Front tire: 7.50-16

Rear tire: 16.9-28

The rear tires have anti-freeze in them since i bought it in 1996. I got on the paved cty rd, and it seemed like it was running lop-sided, meaning I kept bouncing in my seat up and down bc something was really off. the tractor was not wrecked or hit.

When I noticed it wobbling, the rear tires [one more than the other] were low, so I aired them up, front too, to spec. Got back on the paved rd and it still wobbled ???? When I open her up, it tends to wobble/rock less, but at about mid-speed, it just doesn;t seem right.

Does anyone have a clue as to what could be happening? I live in S. Central TX, so no extreme temperatures. I am really lost on this one.

Thank you guys, and Merry Christmas to all,
tstex
 
Drove my tractor yesterday to get set up for the Christmas parade, and it drove like that, a noticable rear wobble left-right-left-right going down the asphalt. I just wonder if one rear wheel is slightly off, not quite running exactly straight forward, if it's set slightly out of line.
 
FBH, when you say "off", what do you mean by that? Do or can these tires be balanced? It just seems strange that after doing the same things for 17yrs with your tractor, then one weekend its balance is really bad, is strange.

Thx,
tstex
 
What is happening is when a tractor sets for any length of time there gets to be a flat spot on the bottom of that tire. When you drive it it will have a little bounce when that spot comes in contact with the ground and when you go around a corner the action of the differential will put the opposite tire flat spot in a different position giving it a side to side motion. Large four wheel drive tractors are really prone to this and especially with rice tires. All you need to do is take it to the field and work it and it will disappear.
 
Its probably just a flat spot in the rear tires from being parked. It is temperary and is more apparent in cold weather.

Rav
 
tstex - What I mean by "off" is that I wonder if one rear tire has somehow got set to run slightly outboard or inboard, in other words [I can"t describe this very well] it rotates like it wants to run towards the ditch, but it"s held back by the rest of the tires, and every rotation it scrubs back into place.... told you I couldn"t describe it very well. I had all the tires removed a year or two for repainting, and maybe I didn"t put them back exactly right.
 
Gentlemen,

I appreciate all of your responses and believe the problem has been identified. I concur that the tire sat too long, with low air, it was colder, and developed a flat spot that the eye cannot detect.

I fully aired-up the tires, so now the next time I am out there I will work her hard and take her on the road in 4th w WOT and run her hard...

Merry Christmas to all and be safe.

Regards,
tstex
 
Check the sidewall. If Nylon cord usually it says so. Nylon used to be used for a lot of tires but the automobile industry had dissatisfied customers due to the flat spotting mentioned herein. So the industry went to polyester and away went the flat spotting.

However my riding lawn mowers do not profess to have nylon cord but do sit for a long time. I run the air low, around 10 to 15 for a smooth ride. Every one of them flat spots and I have to run it out for a few minutes before rounds out.;

Mark
 
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