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[GMCnet] Got Double Trouble weighed at a CAT Scale [message #181757] Sat, 25 August 2012 19:26 Go to previous message
USAussie is currently offline  USAussie   United States
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma:
Senior Member
G'day,

Got Double Trouble weighed at a CAT Scale yesterday:

Weight # 1 - Pulled up with the front wheels on the front scale pad (Steer Axle) and the rear wheels were on the second scale pad
(Drive Axle)

Steer Axle = 4400

Drive Axle = 8140

Total = 12540

I was sitting in the drivers seat and weigh 250 (+/-); Helen was NOT in the pax seat (she weighs 135 (+/-).

Weight # 2 - Pulled up so that the driver side wheels were off the scales completely. The passenger side front wheel was on the
second scale pad (Drive Axle) and the rear wheels were on the third scale pad (Trailer Axle)

Drive Axle = 2320

Trailer Axle = 3900

Total = 6220

I was not in the coach.

Weight #3 - Pulled up so that the passenger side wheels were off the scales completely. The driver side front wheel was on the
second scale pad (Drive Axle) and the rear wheels were on the third scale pad (Trailer Axle)

Drive Axle = 1740

Trailer Axle = 4260

Total = 6000

I was not in the coach.

Compared to the late GMC specs (I chose these cause the data looked better) it looks like this:

Specifications Double Trouble

Front curb = 3750

Front cargo = 750
& Pax Load

Total = 4500 4400

Rear curb = 6820

Rear cargo = 1180
& Pax Load

Total = 12,500 12540

Right / left imbalance spec:

Front: 250

Rear: 600

Double Trouble

Front: 2320 - 1740 = 580

Rear: 4260 - 3900 = 360

This makes sense because:

I have the five draw tool box and a lot of other heavy crap under the dinette.

The water tank was full.

Furthermore I had to order an extended length pork chop adjustment bolt from JimK. When John and I set the front ride height the one
on the passenger side was almost out of threads whereas the one on the drivers side was WAY further out!

I think he slight difference in numbers is due to the fact that did not center the wheels to be weighed in the middle of the scales
when I weighed each side.

They charged me $9.50 for the first weight and $1.00 for each additional weight.

Questions for the GMC Brain Trust:

1) Did GMC actually do anything to the suspension system to up the GAWR and GVWR or just "pencil whip it?"

2) Does my supposition about not having the wheels centered on the scales hold water?

3) Does anyone think there is anything to be gained by weighing the individual axles one by one?

4) Since this is cheap to do I think I'll try it again with both Helen and I in the coach and the wheels as close to the center of
the scales as I can get them when I do the side weights. I don't like the 580 front differential; that delta would drop with both of
us in the seats and it would be what it REALLY is.

Regards,
Rob M.

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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