Proper Tire Air Pressure

Topic 17068 | Page 1

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Tastebuds's Comment
member avatar

I'm learning how to pre-trip in school now and I've watched several videos on pre-tripping. When it comes to air pressure they all say "... inflate to manufacturer's specification on the tire" or something to that effect. My problem with that is when I was working as a mechanic, we were taught that the air pressure listed on the tire is the MAX pressure that tire can handle and the vehicle manufacturer's air pressure is located on a sticker in the frame of the driver door. It seems to me that this would also be the case with CMV's. I also did a forum search for "proper tire air pressure" and while I found several informative threads on this subject, none of them addressed this question. If anything, someone stated that their company has their own specification. Which one is it, door sticker (vehicle manufacturer), tire (tire manufacturer), or something else entirely (company specs)?

CMV:

Commercial Motor Vehicle

A CMV is a vehicle that is used as part of a business, is involved in interstate commerce, and may fit any of these descriptions:

  • Weighs 10,001 pounds or more
  • Has a gross vehicle weight rating or gross combination weight rating of 10,001 pounds or more
  • Is designed or used to transport 16 or more passengers (including the driver) not for compensation
  • Is designed or used to transport 9 or more passengers (including the driver) for compensation
  • Is transporting hazardous materials in a quantity requiring placards
Farmerbob1's Comment
member avatar

I'm learning how to pre-trip in school now and I've watched several videos on pre-tripping. When it comes to air pressure they all say "... inflate to manufacturer's specification on the tire" or something to that effect. My problem with that is when I was working as a mechanic, we were taught that the air pressure listed on the tire is the MAX pressure that tire can handle and the vehicle manufacturer's air pressure is located on a sticker in the frame of the driver door. It seems to me that this would also be the case with CMV's. I also did a forum search for "proper tire air pressure" and while I found several informative threads on this subject, none of them addressed this question. If anything, someone stated that their company has their own specification. Which one is it, door sticker (vehicle manufacturer), tire (tire manufacturer), or something else entirely (company specs)?

When in doubt, default to calling your company and asking them.

If I had to give you an answer, I'd say inflate to cab sticker pressure, provided that the pressure is lower than the tire's rated pressure.

CMV:

Commercial Motor Vehicle

A CMV is a vehicle that is used as part of a business, is involved in interstate commerce, and may fit any of these descriptions:

  • Weighs 10,001 pounds or more
  • Has a gross vehicle weight rating or gross combination weight rating of 10,001 pounds or more
  • Is designed or used to transport 16 or more passengers (including the driver) not for compensation
  • Is designed or used to transport 9 or more passengers (including the driver) for compensation
  • Is transporting hazardous materials in a quantity requiring placards
Susan D. 's Comment
member avatar

On our pretrip exam, we had to state that the tire pressure was,100-110 psi or ma ufacturers rating. Of course the max pressure is listed on the tire.

Tastebuds's Comment
member avatar

Ok, so it's one of those situations where you say one thing to pass the test and then follow the company policy later. That does make sense and was kind of what I thought it would be. Thanks for the responses.

HOS:

Hours Of Service

HOS refers to the logbook hours of service regulations.
Susan D. 's Comment
member avatar

Its that way very much. In my state there is no 3rd party testing and DOT does all of it. My school got a list from the DOT of exactly what they wanted and verbatim on how it was to be said. You could add things but you couldnt leave anything out. That list was 10 pages long.

If you didnt say exactly what they wanted to hear, you failed. They're tough but they do give you 4 separate testing attempts for the initial fee. The examiner told me the average number of attempts to pass is 3.

DOT:

Department Of Transportation

A department of the federal executive branch responsible for the national highways and for railroad and airline safety. It also manages Amtrak, the national railroad system, and the Coast Guard.

State and Federal DOT Officers are responsible for commercial vehicle enforcement. "The truck police" you could call them.

Pianoman's Comment
member avatar

Ok, so it's one of those situations where you say one thing to pass the test and then follow the company policy later. That does make sense and was kind of what I thought it would be. Thanks for the responses.

Sort of..100-110 is actually what I keep my tires at. 110 is what Swift likes them at.

HOS:

Hours Of Service

HOS refers to the logbook hours of service regulations.
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