Weight

Scale your truck with a full load, then do it empty. Note the suspension gauge each time.

For example, all our Macks generally read 65PSI @ 79.500, and 13PSI@ 27.500

 

If that were my truck you’d be way heavy on the drives. But like others have said, all trucks are different. Scale it now and see where you’re at for the pressure it’s at, that will give you an idea.

The fuel filter can either read as restriction (goes up as the filter plugs) or as flow (goes down as pressure drops). The last KW I drove (2017 model) was flow. If it was cold out and the needle started dropping you were fixing to have some problems.

 

That’s correct. Once it starts going red, it will clog in a couple days. Priceless in the winter. It will let you know before the truck starts sputtering if your fuel begins to gel.

 

Having air pressure gauges for your suspension are great.
The thing is, until you get used to what it is telling you, probably a good idea to still scale loads.
Might take just a few, or ten.
Every time you scale the truck, write down what your pressure and weight is, then you can use it as a reference guide.

Last, when in doubt, scale it. Nothing worse than looking at your gauge and the weight citation.

 

Clean your dash

 

Yeah I’m in and out of quarry’s a lot. I just keep the windows up and ac blasting.

 

My dash is dirty too.

Truck has no A/C and windows always down.

Hard to keep clean as I’m in construction sites a lot.

I’ve installed air gauges to help me see how heavy the load is on the axles.

The sterling truck I used to drive maxed out at 80 psi for 18,000 kg on the drives

The freightliner I drove after has the same suspension, but maxed out at 75 psi for 18,000 as well.

The freightliner has more unsprung weight, heavier 46,000 rears with full lockers and the sterling is only 40,000 rears with only interlock.