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Tractor Talk Discussion Forum

Air Pressure Gage OT

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BUDD

12-15-2006 05:37:48




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Ok here is one for you all. I have an air pressure gage on my truck that tells how much pressure is on the drive axels. This gage is used to help in loading so as to not over load the axel. The problem that I have is the gage goes from 0 to 150 psi. 51 psi ish is max load weight. With the wide spread of the gage (0 to 150) I can not tell if I am over or just close on weight. What I would like to do is make this gage read about 150 psi at max load. The psi is just a number to relate to, it really means nothing. The gage is built into the dash so replacing it to another gage is really not an option. Now for the question, how can I change or fix this gage so it will read 150 psi where it reads 51 psi now? Is there an orifice that I can drill out (I do not think so)? Thanks for your input BUDD

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doogdoog

12-15-2006 23:43:21




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 Re: Air Pressure Gage OT in reply to BUDD, 12-15-2006 05:37:48  
Aloha, You could use a digital readout pressure gauge or one like this one. It goes from 0-100psi and the dial size is 4.5" so it would be easier to read.


Mahalo,
doogdoog



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BUDD

12-15-2006 11:52:05




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 Re: Air Pressure Gage OT in reply to BUDD, 12-15-2006 05:37:48  
Thanks to all I guess I will have to install a second gage

BUDD



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ChadS

12-15-2006 09:39:10




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 Re: Air Pressure Gage OT in reply to BUDD, 12-15-2006 05:37:48  
I was thinking thats how much air pressure is in the bags themselves. My old KW-W900 had a guage like that,,,, thats how it was explained to me when I asked. That should be regulated air pressure,, if they was pumped up to the full 150, the bags would be fully extended out. Thats what the self leveler on the rear axle is for to change air pressures based on how much drop the frame puts on the axles, and compensates to level out the truck. The guage was overkill for the pressure,,, it may be 150 psi if the full load was on the drive axles,,, the most Ive ever seen was at 70, I was pretty heavy,, right at the 80K limit, scale house said my drives were too heavy!! Pull er around back they said!! LOL. Chad

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Steven@AZ

12-15-2006 07:26:06




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 Re: Air Pressure Gage OT in reply to BUDD, 12-15-2006 05:37:48  
The local haulers that I've worked with have a gauge mounted right on the trailer or outside of the truck so it's easy to see when loading.

If you want one in the cab, T into the line and add another gauge...



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Bob

12-15-2006 07:42:34




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 Re: Air Pressure Gage OT in reply to Steven@AZ, 12-15-2006 07:26:06  
That was my thought, too, "tee" into the line, and add a suitable gauge.

I was wondering, though, about pressure spikes affecting the lower-range gauge. What happens when the truck bangs over abump?



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Steven@AZ

12-15-2006 07:45:58




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 Re: Air Pressure Gage OT in reply to Bob, 12-15-2006 07:42:34  
You could always put an "on-off" valve in the line going to the lower pressure gauge, turn it off when going down the road.



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Coloken

12-15-2006 06:32:46




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 Re: Air Pressure Gage OT in reply to BUDD, 12-15-2006 05:37:48  
Build a system like having two hydraulic cylinders pushing each other. One hooked to axle would be 2 or 3 times as large as the one pushing air to the gauge. Hard to explain, but if I could draw a picture, would be simple.



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Janicholson

12-15-2006 06:20:28




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 Re: Air Pressure Gage OT in reply to BUDD, 12-15-2006 05:37:48  
The required change in sensitivity would be way beyond the adjustment range of Bourdon tube style pressure gauges. The required change in internal gearing would be a instrument makers task, and expensive. and one effect would be a gaugew that would read way wrong. I agree with those who recommend a second gauge placed in the line giving accurate, more legible readings. JimN



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NEsota

12-15-2006 06:10:09




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 Re: Air Pressure Gage OT in reply to BUDD, 12-15-2006 05:37:48  
You may have already considered hooking another gauge, with a different range, to the same the same line. This way you would preserve the appearance of your dash and not lose anything. Your working-loading indicator could be mounted elsewhere, perhaps in a location that would be more convenient for you, when you are loading.



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IaGary

12-15-2006 05:43:35




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 Re: Air Pressure Gage OT in reply to BUDD, 12-15-2006 05:37:48  
Budd

About the only way to do it is by recalibrating the gauge.

Very few gauges have the calibration feature.

I know what you mean about reading 1 or 2 pounds on a gauge though.

Gary



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