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Tractor Talk Discussion Forum

18.4 38 tire pressure

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rustytenn

11-01-2007 18:54:04
206.74.92.176



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hello, I have a jd 4430 tractor with 18.4 38 radials on it.every few months im having to get the tires fixed from where its pinching the tube. the tires have plenty of tread left on them.how much air should be in them?the rims are new so i know its not the rims.i believe they have 18 psi in the tires . is this enough? they look like they need more air in them.




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jwal10

11-04-2007 11:59:58
71.222.27.39



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 Re: 18.4 38 tire pressure in reply to rustytenn, 11-01-2007 18:54:04  
Put a lug flat on a hard surface with stem on top and fill the tire so the outside of lug lifts off the floor 1/4 inch. I always check the tires each time I change equipment. Check with the load on the hitch, add or remove as needed. No need for a guage....James



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Walt Davies

11-02-2007 12:08:12
75.106.237.14



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 Re: 18.4 38 tire pressure in reply to rustytenn, 11-01-2007 18:54:04  
If you are pinching tubes then they are to big for the tire. The tube should just a bit smaller than inside of the tire and expand to fit. Tubes now are made to fit many different tire sizes if your tube is at the bottom of the size list then that could be your problem.

I alway fill the tire until it just sets flat across the bottom more air causes them to wear out in the center less causes them to wear out on the sides.

I run 10 to 12 on my 18.4X30 tires on my Case LA
Walt

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rustytenn

11-02-2007 08:09:00
206.74.91.254



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 Re: 18.4 38 tire pressure in reply to rustytenn, 11-01-2007 18:54:04  
Well, just had the co-op truck come out and fix my tire. wasnt nothing stuck in it. it was just pinched AGAIN.where it was pinched this time it was a thin spot in the tube.the tire man said he had put a new tube in someone elses a while back and the next day the costumer called and said he had a knot opn the side of his tire and it ended up being a defective tube.i dont think EVERY time mine gets pinched is the tubes fault.but anyway i"ve got 22psi in it now. I was runnin 18 and it looked really like it needed more.I believe next time i need tires i'll try bias ply. i only got the radials cause i figured they would last longer.in one of the replys someone mentioned calcium. here they dont put calcium anymore due to it rustin the rim.they put methonal.thats one more thing if i didnt need the extra traction in winter months i would just run them dry. but anyway..... thanks for all the replys. rusty

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George G

11-02-2007 05:21:02
205.188.117.74



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 Re: 18.4 38 tire pressure in reply to rustytenn, 11-01-2007 18:54:04  
We run 24 to 26 psi, no ballast, in the 18.4R38"s on our White"s. We are pulling manure spreaders loaded to around 14000Lbs. A Gross weight of between 34-40000Lbs. We weigh all of our loads.



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BobHnwOh

11-02-2007 03:22:15
208.252.179.25



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 Re: 18.4 38 tire pressure in reply to rustytenn, 11-01-2007 18:54:04  
I have an AC 7060 with Firestone 18.4X38 Radials,I run 16 lbs with singles and 8 lbs with duals,no rear weights,Bob.



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37 chief

11-01-2007 23:19:33
70.181.171.27



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 Re: 18.4 38 tire pressure in reply to rustytenn, 11-01-2007 18:54:04  
Had the tire man put a new 18.4 38 on our JD 5020 . It went flat shortly after that. The tire man came out again, removed the tube, and found the tube was defective. Made in China strikes again. I didn't even think of where the tube was made, when they said the hole from the fork lift fork was too big to patch. If there was one defective tube out there there may be more. Stan



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Gerald J.

11-01-2007 22:31:59
4.254.68.12



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 Re: 18.4 38 tire pressure in reply to rustytenn, 11-01-2007 18:54:04  
Cheeck the maker's farm tire handbook. I'm running 16 in my bias ply 18.4-34, but it all depends on the load. 12 to 16 is a common range pressures for tractor rears.

Gerald J.



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iowa_tire_guy

11-01-2007 20:34:41
207.177.88.101



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 Re: 18.4 38 tire pressure in reply to rustytenn, 11-01-2007 18:54:04  
I have really have seen very few times when I thought radial tires where worth the price on 2 wheel drive tractors. In order to get the value of the radial it needs to be run low pressure which requires leaving the tractor light wieght. But this usually means that the tractor is too light to get enough traction. Radials work good on FWA or 4WD tractors but not often on 2WD.

Another point is that radials eat tubes, especially if the tire is loaded with ballast. Rusty needs to make sure the Coop has "severe service" tube on board to put in and it will help a bunch. What I have seen and wouldn't believed if told was putting calcium chloride in a tubeless tire. Took one apart this spring that had been mounted 7 years and expected the rim to be rusted through. Not a sign of rust. The liquid has to cover the rim so no air touches metal and it worked. Still a waste of a radial tire but didn't have trouble with tube pinching.

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Don-Wi

11-01-2007 23:24:21
70.224.196.98



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 Re: 18.4 38 tire pressure in reply to iowa_tire_guy, 11-01-2007 20:34:41  

Ya know, you make a very valid point that contradicts what most other guys say, but it makes perfect sense to me.

We've got an Oliver 1855 (2wd) that we bought about 4-5 years ago now. It has a pair of Coop 18.4 R38 radials on it, but they are getting down there on tread and they have severe cracking around the lugs. They still pull pretty good, but we plan to replace them next year unless some other unexpected expense comes up.

The one really big issue I have with them is the way they ride. They don't lope or anything like that, but they just seem to squirm when on the road, espescially when pulling a heavy wagon of corn silage behind the chopper or when pulling the semi-mounted plow. Our 1755 which had 18.4-34 bias tires had a normal feeling ride.

I know that most of the time the tires are awfull close to being overloaded with just the static weight of the tractor, being that it weighs somewhere in the neighborhood of 14,000 lbs with fluid in the rears, a ROPS/canopy, and a pair of fuel tank fenders I just installed. I was tempted to have dad price out a new pair of radials, but the extra expense just doesn't seem worth it for a tractor that only sees about 100-150 hours a year, and the tires would most likely rot off before they wear off.

What would be your opinion type of tire? If we can find a new pair of Power Mark L/S's I'd go for them, otherwise we'll probably go with Titan L/S bias tires. Our 285 has a 20 year old pair of PowerMark's on it and they still look pretty good. Our dead 1755 has Armstrong's on it, and our 165 has the coresponding tire w/ Titan on the side. They all seem to perform well for us.

Donovan from Wisconsin

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RodInNS

11-02-2007 05:27:23
24.224.246.156



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 Re: 18.4 38 tire pressure in reply to Don-Wi, 11-01-2007 23:24:21  
I kinda like the way the radials squirem on the road... especially when I hit a bump. I'd rather the tire take it than my spine. All a matter of what you're used to I spose.
I do agree with you on the 100-150 hours a year usage though. That's about where I draw the line on raidals. If they're likely to rot off first, then I go with a Firestone bias. Won't be Titan 'here'.
Tire guy is likely correct about radials on big 2 wheelers as well. If they could be ballasted correctly, the radial would probably help... but how many are ballasted correctly? I think there are exceptions to that though. In field conditions this year with the moisture we had, the footprint on the Michelins made a huge difference. They made a huge difference over even the Firestone 23 degree radials. I dragged the baler through holes this year where I would have been stuck with bias tires, even with FWD. It's really quite interesting to watch those tires spread out in the mud, leave a 2" deep lug print in the mud, not spin, and then have the baler coming behind with 11L15's, sunk to the axle and not a wheel turning! I never did that with a bias tire. The tractor would be sunk to the axles first.

Rod

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Don-Wi

11-02-2007 07:11:13
70.224.196.98



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 Re: 18.4 38 tire pressure in reply to RodInNS, 11-02-2007 05:27:23  
I'll admit the 285 has a slightly rougher ride on the road, but a good seat takes out all the bumps. The seat on the 1855 is very good. I just don't like the side-to-side feeling squirm that it does on slight curves and in the roundabout. Kinda makes it feel unstable, even if I'm going plenty slow.

Donovan from Wisconsin



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buickanddeere

11-01-2007 19:05:59
216.183.130.137



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 Re: 18.4 38 tire pressure in reply to rustytenn, 11-01-2007 18:54:04  
We need some info here. Any ballast & how much? Ideal tire pressure depends on the weight the tire is carrying. Ideal tire pressure also depends if this a feedlot mixer wagon tractor. Or used in high draft load applications in the lower gears and with the engine lugging hard. There is a real problem with economy minded persons over filling tires with extra ballast in order to obtain some cheap extra traction. Problem is the tire doesn't have enough airspace to allow cushioning & flex. May as well just bolt rubber treads over a steel wheel. The tube and or tire can blow while the tractor bounces over a bump or abrupt edge. If you are stuck having to use liquid ballast in cases such as a 2WD loader tractor. The ideal liquid level is just 1/2 way, up to the axle height. Ballast levels higher than the valve stem when the valve stem is at 12 o clock is looking for trouble. Is the tube marked with radial,bias or nothing?

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rustytenn

11-01-2007 19:22:00
206.74.92.176



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 Re: 18.4 38 tire pressure in reply to buickanddeere, 11-01-2007 19:05:59  
the tire does have methanol in it. i use the tractor for disking,turning,chiseling and stuff like that.its a radial tire.I believe the fluid is close to halfway.I have the local co-op fix it when it goes down.I was turning ground today when it went flat.



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RodInNS

11-01-2007 19:49:01
24.224.246.156



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 Re: 18.4 38 tire pressure in reply to rustytenn, 11-01-2007 19:22:00  
The largest single factor I've found in dealing with radial tires is the load they're carrying. To give you any kind of answer on inflation pressure we'd need to know the weight being carried by the rear axle. That includes the weight of the plow, the weight the plow transfers to the rear axle, and the weight of the tractor normally transfered to the rear axle. This is not just a simple matter of static ballast as it's sitting in the yard but a matter of the transfer that takes place when you lift that plow or it digs in hard and pulls down on the back of the tractor. You could be in a situation at times where you have 95% of the tractor's gross weight sitting on the rear tires plus the weight of the plow, plus a pile of draft from it digging in the ground.

A simple answer is that if you're pinching tubes or turning the tires on the wheel and shearing the valve stems off, you need more air... I run a mounted plow on mine and run the air up to about 18 psi to aleviate those problems... and I do have problems if I don't air them up.
I've pretty well made up my mind to run them dry when I get new tires in the spring. The CaCl is going to sit in the barrels while I try it without. I'll add steel ballast if I need it.

Rod

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iowa_tire_guy

11-01-2007 19:00:45
207.177.88.101



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 Re: 18.4 38 tire pressure in reply to rustytenn, 11-01-2007 18:54:04  
Need more information. Do they have fluid in them? What ply rating/star rating/load index do they have? How much does the rear axle weigh? With these answers I could give you a close guess on what pressure to run. But unless you have real heavy load on them 18psi should be enough to keep them from being pinched unless you are jumping curbs or other abuse. I would recommend using extra heavy duty tubes. They cost 25% more but cheaper than getting them fixed. Also a note, radial tires don't like tubes.

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rustytenn

11-01-2007 19:33:24
206.74.92.176



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 Re: 18.4 38 tire pressure in reply to iowa_tire_guy, 11-01-2007 19:00:45  
I dont know the specs on them but they are radial tires.there on a 4430 jd cab tractor with weights on each rim[2 on each rim]and the tire are tube type tires.im going to get it fixed tomorrow i"ll see bout heavy duty tubes.its just sometimes it may go a year or maybe 6 months and im going thru this again. this time it was 2 months



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