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Archive for December, 2009
Tire Pressures
Posted by Mike from Benicia, CA, US on December 17, 2009
Should tire pressures on commercial truck tires (fire engines) be based on the vehicles loaded weights? It seems that the practice is to inflate to maximum PSI. Is there any benefit to weighing the vehicles and determining proper pressure? For example: we have a vehicle with G159 265/70R19.5 tires. It has 8,360 pounds on the front axle, 13,200 on the rear (duals). Currently all are being run at 110 PSI. How/where can I figure out the proper pressures? Thanks
Although you could inflate to maximum pressures on all the tires on the truck, you will not optimize tire wear and the ride and handling of the vehicle. If you weigh the vehicle, as you have done, and find that in any or all cases, you don't need maximum pressures to carry the load, reset the pressures as needed. You can find the proper pressure in a load/inflation table, supplied by all tire companies in their published data book or on their websites. For the tire you are running, you will find the steer tires can be run at 85 psi and the drive tires can be run at 80 psi. For simplicity, you could inflate all tires to 85 psi. By setting the pressures for the load being carried by each tire, the footprint that the tire creates on the road surface is optimized for even wear from shoulder to shoulder of the tire. And, the ride of the vehicle will certainly be better than with the inflation pressures of the tires at 110 psi,
garbage truck wheels
Posted by Ben from Stacy, MN, US on December 10, 2009
cant find any info but was told that five hand hole wheels are better
than two handhole wheels on garbage trucks as far as heat blowouts would you say this would be a industry standard or someone trying to sell wheels
For this question, I asked Dave Overton, field engineer at Accuride, for his thoughts. Here is Dale's response:
"One could argue that the 5 hand hole wheel might provide better air cross-flow than a 2 hand hole wheel when the truck is stationary. During motion there is essentially no difference. Transit and refuse have used the 5 hand hole for years and it seems like each garage has their own justification and reasons." Dale E. Overton, Field Engineering, Accuride Corporation
trailer tire wear 1
Posted by westly from elgin, OR, US on December 1, 2009
my trailer was recently equipped with 6 recap tires and 2 used drive tires (the drives are side by side) i picked up a vibration after about 1000 miles and continually gets worse. I have since traced it to the trailer. ( The truck was equipped with 8 new drives at the same time, and has new shocks all the way around.) the 3 inside recap tires are punching ribs out as well as flat spotting clear across the tire, the used drive tires are as good as the day we put them on. I have put about 85K on since then. the new drive tires are wearing good as well as the outter trailer tires. The pressure was at 110-120 and deflated to 90 after about 15K miles. I feel it is a tire problem. Could that be the case? the tire dealer said the tires were under inflated.
You could have a number of things causing the vibration. You don't mention anything about balance. A balance issue could be from the tire, the wheel the hub or any combination of all these things. The same can be said for radial or lateral runout. If either of these are happening, the problem might get worse over time as you have described. The wear conditions you describe could be a result of balance or runout issues or the result of them.