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Old 03-15-2018, 08:31 AM   #1
cogito ergo moo
 
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Weighing day coming up..

So, one of the nice things about where I work is we have an 80,000 tractor trailer scale. Every truck into and out of the plant must weigh. We are kinda slammed right now, but when things ease up, I am going to haul the Rockwood up to work and spend a few hours getting it weighed out. I'm trying to figure out the most efficient plan to get all the weights with the least number of movements. FYI, this is a single element scale. It just reads overall weight. It cannot read different 'zones'

Here is my plan so far:

1) weigh front axle by itself with WDH attached.

2) disconnect WDH, weigh front axle again. W1-w2 = WDH transfer.

3) Pull forward, weigh truck with trailer attached. W3 - W2 give rear axle weight.

4) Pull forward, weigh truck and trailer combined for gross weight.

5) unhitch, weigh trailer by itself.

6) grab trailer and pull forward, set jack down off scale and weigh just the trailer axles. W5-W6 = tongue weight.

I think that gives me most of the weights a man would need. If I need to make any adjustments to the WDH, i can redo 1 and 2 until I am happy.

Anybody see anything I am missing?

Tim
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Old 03-15-2018, 08:55 AM   #2
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I believe you have a good plan. I would also add # 3.5 weight trailer axles with WDH and with out. Additionally, if your trailer is not level while towing you, may want weigh the trailer axles independently to ensure they are equal or close to equal. I wish I had access to a scale, I need to do the same thing for my new fifth wheel. My local truck stop is in the process of being rebuilt and the scale is out of service.
Happy trails.
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Old 03-15-2018, 09:09 AM   #3
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Originally Posted by Cowracer View Post
So, one of the nice things about where I work is we have an 80,000 tractor trailer scale. Every truck into and out of the plant must weigh. We are kinda slammed right now, but when things ease up, I am going to haul the Rockwood up to work and spend a few hours getting it weighed out. I'm trying to figure out the most efficient plan to get all the weights with the least number of movements. FYI, this is a single element scale. It just reads overall weight. It cannot read different 'zones'

Here is my plan so far:

1) weigh front axle by itself with WDH attached.

2) disconnect WDH, weigh front axle again. W1-w2 = WDH transfer.

3) Pull forward, weigh truck with trailer attached. W3 - W2 give rear axle weight.

4) Pull forward, weigh truck and trailer combined for gross weight.

5) unhitch, weigh trailer by itself.

6) grab trailer and pull forward, set jack down off scale and weigh just the trailer axles. W5-W6 = tongue weight.

I think that gives me most of the weights a man would need. If I need to make any adjustments to the WDH, i can redo 1 and 2 until I am happy.

Anybody see anything I am missing?

Tim
Buying lunch for the guy who runs the weight shop????
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Old 03-15-2018, 09:19 AM   #4
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Is the issue that you're your trying to do 'the least number of changes' or the 'least number of passes'?

If I were you, I'd probably do it this way:

Starting with WDH hooked up:

1) Measure front axle
2) Pull forward, measure front+rear
3) Pull forward, measure front+rear+trailer
4) Pull forward, measure trailer where truck is off scales but jack will be on scales if it drops.
5) Drop the jack and unhitch, measure trailer alone with jack.
6) Hitch back up but don't engage WDH, measure trailer without WDH
7) pull around and back over scales, measure front axle.
7) pull forward, measure front+rear
8) Drop trailer so jack is off the scale and unhitch, measure truck alone.
9) Pull forward (leaving the trailer behind) and measure only rear axle.

This should give you every possible measurement, or the means to calculate every possible measurement. Now you just need to backup over the scale, hook back up to the trailer and go home to do your math.
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Old 03-15-2018, 09:20 AM   #5
cogito ergo moo
 
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Buying lunch for the guy who runs the weight shop????
There is no 'guy'. It's automated where the truck driver check themselves in and out.

But I'll probably buy lunch for me, so i guess that's the same thing...

Tim
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Old 03-15-2018, 05:22 PM   #6
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Quote:
Originally Posted by Cowracer View Post
So, one of the nice things about where I work is we have an 80,000 tractor trailer scale. Every truck into and out of the plant must weigh. We are kinda slammed right now, but when things ease up, I am going to haul the Rockwood up to work and spend a few hours getting it weighed out. I'm trying to figure out the most efficient plan to get all the weights with the least number of movements. FYI, this is a single element scale. It just reads overall weight. It cannot read different 'zones'

Here is my plan so far:

1) weigh front axle by itself with WDH attached.

2) disconnect WDH, weigh front axle again. W1-w2 = WDH transfer.

3) Pull forward, weigh truck with trailer attached. W3 - W2 give rear axle weight.

4) Pull forward, weigh truck and trailer combined for gross weight.

5) unhitch, weigh trailer by itself.

6) grab trailer and pull forward, set jack down off scale and weigh just the trailer axles. W5-W6 = tongue weight.

I think that gives me most of the weights a man would need. If I need to make any adjustments to the WDH, i can redo 1 and 2 until I am happy.

Anybody see anything I am missing?

Tim
That seems a LOT of trouble and effort. If you go to a CAT scale, weigh your rig which will give you all three weights, Steering axle, Drive axle and trailer axles, the drop the trailer and reweigh just the truck, you will have all the info you need and it will take 30 minutes tops. And a written proof to boot.
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Old 03-15-2018, 06:05 PM   #7
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Quote:
Originally Posted by Kaadk View Post
Is the issue that you're your trying to do 'the least number of changes' or the 'least number of passes'?

If I were you, I'd probably do it this way:

Starting with WDH hooked up:

1) Measure front axle
2) Pull forward, measure front+rear
3) Pull forward, measure front+rear+trailer
4) Pull forward, measure trailer where truck is off scales but jack will be on scales if it drops.
5) Drop the jack and unhitch, measure trailer alone with jack.
6) Hitch back up but don't engage WDH, measure trailer without WDH
7) pull around and back over scales, measure front axle.
7) pull forward, measure front+rear
8) Drop trailer so jack is off the scale and unhitch, measure truck alone.
9) Pull forward (leaving the trailer behind) and measure only rear axle.

This should give you every possible measurement, or the means to calculate every possible measurement. Now you just need to backup over the scale, hook back up to the trailer and go home to do your math.
I agree that this is a more sensible flow. No need to continually move or hitch/unhitch if done in the right sequence. Dropping jack and unhitching, rehitching is tedious enough without multiplying the issue.
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Old 03-15-2018, 07:43 PM   #8
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YES! Weights are VERY likely to differ from side to side on one (or more) axles. You really need an accurate weight for EACH wheel position. Once you have ALL that information, then you can make educated decisions re any changes that need to be made.
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Old 03-15-2018, 07:54 PM   #9
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Buying lunch for the guy who runs the weight shop????
you work where trucks come and go but you never drove one, weigh your truck one day by itself. 2, take ttruck and trl with wdh pull one Axel at a time on scale and record weights. 3, disconnect wdh and repeat step 2 one Axel at a time. then do the math. good luck.
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Old 03-15-2018, 10:53 PM   #10
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Smart!

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you work where trucks come and go but you never drove one, weigh your truck one day by itself. 2, take ttruck and trl with wdh pull one Axel at a time on scale and record weights. 3, disconnect wdh and repeat step 2 one Axel at a time. then do the math. good luck.
Good sequence! Much more efficient.

And he's not tying up the scale while he unhitches/rehitches.

Larry
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