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 03-14-2002, 10:38 Post: 36335
mower
2002-03-14 10:38:45
Post: 36335
 air pressure for smoother ride

I just purchased a new JD 4100. I made the move up from a JD 455 lawn & garden tractor. One thing I quickly noticed was the rougher ride of the 4100. Will reducing air pressure help smooth the ride some? The tractor has the industial tread tires.






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 03-15-2002, 05:43 Post: 36356
TomG

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 air pressure for smoother ride

Industrials do have advantages over other types, but they also are known for their rougher rides.

Lower air pressures give smoother rides. However, it's best to run air pressures specified in a load chart for the particular tires. Many tractor tires take surprisingly low pressures--especially to people used to beefy truck tires. However, the pressures should be appropriate for loads actually on the axles, and load charts should be available for the tires. Grossly wrong pressures become safety issues. Wrong pressures also can change the front/rear axle drive ratio and cause extra wear and tear on the front drive train. However, it is easy to overstate these issues. They may be real, but that doesnít turn tire pressures into rocket science, and I imagine that few people adjust pressures every time they change an implement.






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 03-15-2002, 06:21 Post: 36360
Mrwurm



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 air pressure for smoother ride

When I use to drive pick-up trucks you could get two different kinds of tires. 'P' rated tires such as P23575R15. These were passenger rated tires with a lower load range than 'LT' tires. The other tires (as mentioned) were the 'LT' tires such as LT26575R16. I was told that these tires had a thicker side wall and as such had a higher load rating. I am thinking that maybe it's the same for R4 industrial tires. Maybe they have a thicker sidewall than the turf tires that you are used to and a stiffer ride is unavoidable.
Jerry






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 03-15-2002, 06:47 Post: 36362
BillMullens

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 air pressure for smoother ride

Lower pressures will smooth the ride noticeably. I had my tractor for several months before I bothered to check the pressure, they were much too high. Lower pressure helped the ride and helped traction, too.
Bill






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 03-15-2002, 08:41 Post: 36363
DRankin



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 air pressure for smoother ride

If you have a stiff sidewall then let it do it job. The "right" tire pressure for a tractor is evident when there is a generous bulge in the sidewall just above the ground. If that means you carry ten pounds of pressure in the tires then that is right as far as I am concerned. I think I am currently running about 12 or 14 pounds in the rear tires on my 4100. The ride is softer and the traction is markedly improved over the same tire with 30 pounds of pressure. A couple things to remember: Under inflating a tire on a car is dangerous because of the weight of the vehicle coupled with high speed operation will cause the tire to overflex, overheat and fail. That is what happened to the Ford-Firestone combination. Our 4100ís, even when carrying the biggest implements, are nowhere near the weight of even a small pick-up and with a top speed of 11 miles per hour we will never have to worry about tire failure. By the way, I keep my front tires inflated so the good bulge is present when the loader is full of dirt. Hope this helps. Mark






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 03-16-2002, 05:53 Post: 36389
TomG

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 air pressure for smoother ride

I sort of compromise on front tire pressures. The load chart for my turfs gives 12 lbs. as the greatest load rating. I run 16-lbs. summer and 10-lbs. winter for extra traction. Sixteen pounds is nowhere near the max pressure rating for the tire, but I just let the side-walls bulge under buckets of gravel. My reasoning is that I'm not going very far with that weight. I go much further with light loads, and I'd rather run pressures that keep the axle drive ratios within spec.

High pressures increase a tire's rolling circumference, which increases the front axle lead. Axle lags and excessive leads contribute to front drive wear and tear when in 4wd. Anyway, anybody who runs high front tire pressures for their loaders and also have difficulty disengaging their 4wd might try reducing the front pressures a bit. In addition, most specs call for mild front axle lead, and for that reason it's good to stay in 2wd when on paved surfaces, but especially if high front pressures are used.






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 03-16-2002, 09:10 Post: 36396
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 air pressure for smoother ride

Excellent advise. It is something I do without even thinking and didn't think to pass along. Thanks Tom.






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 03-16-2002, 22:05 Post: 36412
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 air pressure for smoother ride

Mark do you have industrial tires on your 4100? What is the pressure you run in your front tires?






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 03-16-2002, 23:40 Post: 36413
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 air pressure for smoother ride

Well, here is the story. I shot my wad buying the tractor and never thought to question the usability of R1 ags for my needs. I wish I had known about this board a year ago. I certainly could not afford to buy a set of replacement tires from JD when I found I was operating a 4wd rotor tiller. So I carefully measured and did some scientifical (hey that's a real word) calculations to establish the circumference ratio between front and rear tires and went down to the tire store. I found a good size match with a Mud and Snow 245/75-R16 on the rear and a 145R12 all season tires on the front. I get all the traction I need on the steep sand dune I live on and spent about a thousand bucks less than replacing tire and wheels through Deere. The fronts are made for tiny cars like a Subaru justy and I keep them at around 30 pounds these days and run about 10 or 12 in the rears. I have modified the backside on my FEL to act as 5th wheel hitch so I can park my travel trailer where my pick-up fears to tread and the tongue weight is about 700 lbs. If not for that I might run them a little lower. More info than you wanted I am sure, but since I am not running traditional tractor tires the answer is not so simple.






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 03-16-2002, 23:48 Post: 36414
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 air pressure for smoother ride

MrWurm: I don't think you can be a full fledged member of the tractor board if you don't drive a pick-up any more. We are gonna pretend you never said that. Now don't say it again. Mark






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Discussion Boards > Active Subjects > Messages as Posted > Tractor Tires Forum

Thread 36335 Filter by Poster:
BillMullens 1 | Bob H. 3 | DRankin 4 | jyoutz 1 | mower 2 | Mrwurm 1 | TomG 6 |

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