Rifleman Posted January 8, 2014 Share Posted January 8, 2014 I notice the cab on my MH612 doesn't move up and down as much as the UPS MHs I drove. I put new shocks and air bag on, still seem stiff. the lever valve seem to be working and I in stalled a new control rod. Rifleman Quote Link to comment Share on other sites More sharing options...
Timmyb Posted January 8, 2014 Share Posted January 8, 2014 I used to drive an old truck with air ride cab. Ride height valve was never hooked up and it was rough as! When I installed a new one it was like a completely different truck. Double check the valve. Also when I did mine there were instant response valves and delayed response valves. I went with an instant response one. Hope that helps some. 1 Quote Link to comment Share on other sites More sharing options...
Popular Post kscarbel Posted January 8, 2014 Popular Post Share Posted January 8, 2014 And make sure you have the ride height adjusted per Mack service bulletin SB-668-008.http://hr.mckenzietank.com/maint/Bulletins/02-sb668008.pdf 3 Quote Link to comment Share on other sites More sharing options...
MHfred Posted January 8, 2014 Share Posted January 8, 2014 Thanks very much for posting that bulletin. When I bought new air bags and shocks for my MH the service manager thought the measurement was 9 inches but was not sure and was not aware of the bulletin apparently. 1 Quote Link to comment Share on other sites More sharing options...
Mack Doctor Jr. Posted January 9, 2014 Share Posted January 9, 2014 ya good call on the bulletin! 1 Quote Link to comment Share on other sites More sharing options...
Marcel67 Posted January 9, 2014 Share Posted January 9, 2014 Thanks that's great, I just replaced my cab shocks and now I can get it correct. 1 Quote Link to comment Share on other sites More sharing options...
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