Will Posted 15 hours ago Share Posted 15 hours ago Hi have a 1998 Mack trident on neway 4 bag suspension. Seems that one side is getting more air pressure then the other side. any idea why this would be happening? thanks will Quote Link to comment https://www.bigmacktrucks.com/topic/76516-neway-suspension/ Share on other sites More sharing options...
Geoff Weeks Posted 14 hours ago Share Posted 14 hours ago Some trucks have left and right level valves. The heavy haul tractors one place I worked had their tractors set up like that. You had to make sure they both set exactly the same. This assumes that you have actually measured the pressure at the bags on left and right. Trucks with only one valve, well you only have one source feeding so they can't be getting different pressure from the valve. Quote Link to comment https://www.bigmacktrucks.com/topic/76516-neway-suspension/#findComment-593595 Share on other sites More sharing options...
Will Posted 14 hours ago Author Share Posted 14 hours ago Could it be a bad ride height valve? Quote Link to comment https://www.bigmacktrucks.com/topic/76516-neway-suspension/#findComment-593600 Share on other sites More sharing options...
Geoff Weeks Posted 13 hours ago Share Posted 13 hours ago not that I'm aware of. Take a picture of the valve in question. The ones I'm talking about have only 3 ports, inlet, outlet and exhaust. Quote Link to comment https://www.bigmacktrucks.com/topic/76516-neway-suspension/#findComment-593606 Share on other sites More sharing options...
Geoff Weeks Posted 13 hours ago Share Posted 13 hours ago Did you check for two valves? Did you check the pressure at right and left bags and confirm they are different? Quote Link to comment https://www.bigmacktrucks.com/topic/76516-neway-suspension/#findComment-593607 Share on other sites More sharing options...
Will Posted 10 hours ago Author Share Posted 10 hours ago It’s got a valve on both sides at rear of truck Quote Link to comment https://www.bigmacktrucks.com/topic/76516-neway-suspension/#findComment-593610 Share on other sites More sharing options...
Geoff Weeks Posted 1 hour ago Share Posted 1 hour ago Ok, then it sounds like one valve is either defective or out of adjustment with the other. The correct way to set them up is to block the frame up to the correct ride height. with the valves not connected to air or the bags, Lock the valves in the neutral position (how you do this depends on the valve) the Neway one pictured has a hole with a little dowel through it, you use to set it. The you adjust the linkage so it just slips on the arm with the truck at the right height. Do this on both sides then remove the dowels and connect the lines, air the truck up, removing the blocks and re checking the height on both sides. Twin valves are more difficult to set up then single, but provide side to side stability for loads that may be top heavy, it prevents the air from going to the side that is less loaded going around a corner with a high CG load. Most don't bother with a twin and just use a single valve, but on a dumper, or a tractor that hauls a dump trailer or OD loads that have a high CG it can be a good thing. Quote Link to comment https://www.bigmacktrucks.com/topic/76516-neway-suspension/#findComment-593614 Share on other sites More sharing options...
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