scottwetzel Posted April 4, 2016 Share Posted April 4, 2016 Has anyone figured out the proper ride height on the Hendrickson air ride under a superliner? We recently put a ch air ride under ours and am getting s bad viberation. Any help would be great. Quote Link to comment https://www.bigmacktrucks.com/topic/15662-proper-ride-height-on-hendrickson-air-ride/page/2/#findComment-329515 Share on other sites More sharing options...
BC Mack Posted April 5, 2016 Share Posted April 5, 2016 I think this may have come from our Wiki or a BMT poster... BC Mack sb136012 air suspension[1].pdf 1 Quote Link to comment https://www.bigmacktrucks.com/topic/15662-proper-ride-height-on-hendrickson-air-ride/page/2/#findComment-329549 Share on other sites More sharing options...
scottwetzel Posted April 5, 2016 Share Posted April 5, 2016 13 minutes ago, BC Mack said: I think this may have come from our Wiki or a BMT poster... BC Mack sb136012 air suspension[1].pdf I actually have this bulliten but our superliners only have 9.5 inch tall frames and that document states for frames with 10.47 inches and 11.81 inches. I'm thinking since my frame is not as tall those measurements wouldn't be correct. Agreed? Quote Link to comment https://www.bigmacktrucks.com/topic/15662-proper-ride-height-on-hendrickson-air-ride/page/2/#findComment-329553 Share on other sites More sharing options...
scottwetzel Posted April 5, 2016 Share Posted April 5, 2016 So I did measure my superliner that's on camelbacks front rear from the top of rear housing on the left side to the top of the bottom frame rail and that measured 6 3/4 inches. Would it make since to set the air ride truck to the same measurement since it uses the same axle housings and the same frame rails? Again the superliners use a frame that's not as tall as a ch so there for I don't believe there is documentation on the proper ride height for this set up. And I don't think the Hendrickson suspension was ever available from the factory on frame rails as short as ours. Quote Link to comment https://www.bigmacktrucks.com/topic/15662-proper-ride-height-on-hendrickson-air-ride/page/2/#findComment-329555 Share on other sites More sharing options...
j hancock Posted April 5, 2016 Share Posted April 5, 2016 Some more info. A couple different measurements mentioned. http://hr.mckenzietank.com/maint/Bulletins/16-sb136012.pdf Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/15662-proper-ride-height-on-hendrickson-air-ride/page/2/#findComment-329560 Share on other sites More sharing options...
scottwetzel Posted April 5, 2016 Share Posted April 5, 2016 8 hours ago, j hancock said: Some more info. A couple different measurements mentioned. http://hr.mckenzietank.com/maint/Bulletins/16-sb136012.pdf That bulletin still doesn't specify what the proper ride height should be with a 9.5 inch tall frame with al or al II suspension and Mack rears. Quote Link to comment https://www.bigmacktrucks.com/topic/15662-proper-ride-height-on-hendrickson-air-ride/page/2/#findComment-329584 Share on other sites More sharing options...
j hancock Posted April 5, 2016 Share Posted April 5, 2016 Yes, it doesn't list a measurement for your custom application. With a frame depth of 9.5", I would make a height gauge at 5 3/8" as a starting point similar to the ones shown in the pdf. Have you checked the pinion angles of the rear axles? Improper driveline angles will lead to vibration. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/15662-proper-ride-height-on-hendrickson-air-ride/page/2/#findComment-329590 Share on other sites More sharing options...
scottwetzel Posted April 5, 2016 Share Posted April 5, 2016 1 hour ago, j hancock said: Yes, it doesn't list a measurement for your custom application. With a frame depth of 9.5", I would make a height gauge at 5 3/8" as a starting point similar to the ones shown in the pdf. Have you checked the pinion angles of the rear axles? Improper driveline angles will lead to vibration. No I haven't. Not sure exactly how to do that but I thought by getting the correct air ride height it would correct that as well Quote Link to comment https://www.bigmacktrucks.com/topic/15662-proper-ride-height-on-hendrickson-air-ride/page/2/#findComment-329596 Share on other sites More sharing options...
j hancock Posted April 6, 2016 Share Posted April 6, 2016 It should but this is now custom. If you have the VIN from the truck where the suspension came from or a similarly equipped, the dealer should be able to get you the pinion angle spec. I have an inexpensive protractor for finding angles but there are digital ones out there too. Both axles have to be check and usually they are the same degree. Probably going to be between 1 1/2 to 3 degree pinion up. On Hendrickson, there are plates for adjusting the angle if needed. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/15662-proper-ride-height-on-hendrickson-air-ride/page/2/#findComment-329724 Share on other sites More sharing options...
theakerstwo Posted July 1, 2019 Share Posted July 1, 2019 On 9/10/2010 at 12:35 AM, rhasler said: Mack says 4 1/4" for 11.81" wide frame rails and Mack AL and AL II air suspension (Hendrickson HA/HAS). Measured with chassis unloaded, at the front axle housing, from the bottom flange on the frame rail to the bottom of the main support member on the spring. I have a CH with 10" frame and I have read the adjusting instruction on a AL11.I am still mixed up and the dealer don't know here about it.It has mack axles and it say to measure from bottom of frame down the top of spring support.There is one spring leaf and a taper block under the spring on top of the support bracket.If i set the height to 4 1/4 to the support bracket under the taper block I am almost bottomed out on the bags.It I set the height from the bottom of the spring on top of the taper block to the frame that looks more like it.Can one you techs straighten me out.I have read this many times and my son which is still a truck mechanic can not understand it. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/15662-proper-ride-height-on-hendrickson-air-ride/page/2/#findComment-426545 Share on other sites More sharing options...
JoeH Posted July 1, 2019 Share Posted July 1, 2019 Measure another truck with same size tires from ground to top of rail. Set your truck to that and call it a day. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/15662-proper-ride-height-on-hendrickson-air-ride/page/2/#findComment-426583 Share on other sites More sharing options...
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