Road Vibration in DK45C

[tallur4me]

I've had a few days to use my new DK45C and I believe the reply's regarding the tires causing the vibration are right on target. I have less vibration now and was able to check the vibration on a downhill area with the engine speed at a low rpm and the clutch depressed and found the vibration at about the same mph as with the engine rpm's at 1800 plus. Now before some one reminds me that I'm not supposed to clutch the tractor downhill I will state that this was a small down grade.
Now if I could just get more roll back on the FEL.
Thanks to everyone who replied.
J D Strain

[VictorW]

A similar vibration happened to me with a 2wd and the rear tires loaded.They were overfilled. Check out this site from goodyear. You can download the tire handbook and/or view via acrobat adobe. There's a section on loading tires and what to expect. http://www.goodyearag.com/tirehandbook.html
There's other good info on tires if you have time.

[slowzuki]

The dealer I got our tractor from filled the rears without me asking. I was hoping to leave them empty for a better ride but oh well.

The R-4's on it do vibe a bit on the road, less than the R-1's on the other tractor.

[psuedofarmer]

excellent point about over-wintering affects on tires - my DK55c has been sitting for 3 months and i'm worried about what i'll find regarding tire condition. someone mentioned that this issue will go away with use - i'll report back on this thread when i finally get the tractor on the road this weekend.

i think i need to revisit my thinking about not using the tractor in the winter - i try to start it 1x/month, but i'm not moving it.

should i be stretching her legs to prevent any tire issues?

cheers.
pf

[KiotiJohn]

</font><font color="blue" class="small">( should i be stretching her legs to prevent any tire issues?
)</font>
Not really. The bias ply tires just get a little flat sided over time, but it does work its way out with use. I don't think you should worry about it.
Only thing is, I can't see how anyone could stand to go that long without at least a little joy ride! John

[slowzuki]

I've noticed the R-4's go flat sided over night! Going down the road you get a distinct thump in the rear proportional to rear tire speed!

[JeffandTamara]

I have just purchased a used DK35. 450 hrs.. There is a lot of vibration at higher speeds. The Vibration seems to diminish at full throttle in both 3rd and 4th.
I can't tell if it is coming from the front or rear. But the vibration is there whether there is load on the tractor or coasting downhill. I also know it is in 2WD. No unusual sounds or other issues... Any ideas on what to check?? Thanks for your insight and help

[ERE]

Originally Posted by psuedofarmer

i think i need to revisit my thinking about not using the tractor in the winter - i try to start it 1x/month, but i'm not moving it.
should i be stretching her legs to prevent any tire issues?

I'd "streatch her legs but not for her shoes (tires). During the winter, the gear sumps are breathing outside air in and out with changes in temp and barometric pressure. I't is good to spin all of the gears to splash lubricating oil up on them. It doesn't hurt to have a different spot for the ball bearings to rest on every week or so either. I also cycle all of my hydraulics up and down, curl etc to get a fresh coat of oil on the pistons.

[punkinspecial]

The same phenomena(a good Halloween word) can happen with a 2wd tractor and its rear tires. It is influenced by the speed, road surface, and the weight of a rear hitched implement. I also experience this with my DK55. If your tractor is going to sit for an extended period of time, it can be jacked up enough to take some weight off the tires and then be supported by wooden blocks. This will help prevent the flat spots on the tires.

[JeffandTamara]

Thanks Punkin....
If I understand correctly form the posts...there is some consenus there is a high potential the vibration is coming from flat sided tires....The tractor has been setting for a while and has a backhoe attached, with filled tires., so that fits with the load on back may complicate things... How long does it take to work out the flat spots? Days, week??? any ideas... I ran it quite a bit for a couple of days now, and I can't detect any difference.... On a Newly aquired tractor, it is a little scary to get it up to speed and have the whole tractor shake like it does...I do believe there could be some validity in Flat sided tires, in that at progressively higher speeds, the vibration seems to disipate, I hope that means the resonance frequency is highest at some intermediate speed thus the vibration is low at low and high speeds. If it was something mechanical...perhaps it would just get worse at higher rpm....
I'll plan to run it some more in the next few days....and report back...