Posted by Franz [24.149.37.138] on Tuesday, December 22, 2015 at 03:57:13 :
In Reply to: Re: Willy air line question posted by Willy-N [72.168.160.5] on Tuesday, December 22, 2015 at 00:29:36 :
For whaat you want to do, quick math says 20# of air on 5" bags gives you an additional 1600# of lift.
We been doing strange things with bags since the 60s when Gene Tuxill started picking up buildings with bags instead of jacks.
I built a few tilt bed trailers using a bag to do the tilting rather than screw with hydraulics and they work well.
When I got the exploder it had the usual Dorf sagging read springs. Rather than add leaves or screw around with rearching I put a pair of 5s on. It can't be done because Nobody makes a kit according to Experts. Fine, call me Nobody, I'm just a dumb weldor.
Normal running with my toolbox in back I'd put about 5-7psi on the bag and it rode nice. Hook on a trailer and blow the bags up to 15-20psi. I had a little tire inflater compressor to do the work.
Bags over springs require only tubing and fittings, only straight airbag systems require controling valves. The spring and bag complement each other.
ONE BIG THING- since you're a dump truck you need to remember to dump the air out of the bags before you dump or you can get in trouble fast when load shifts. For a truck your size I'd go to a slow release valve to let the weight onto the springs slowly to minimize damage potential.
BTW, if you stumble onto any 2" diameter bags like are used on conveyor systems I need a couple for garden tractor seats, so let me know if you find them.
Also stick to Firestone or Goodyear.
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