mechohaulic Posted 18 hours ago Share Posted 18 hours ago that wouldn't be a valve NORMALLY associated with parking brake system / should be a regulator valve , question is = what system ?? suggestion would be to trace lines best possible, or what valve / switch do you move to make a difference in valve leak. Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/6/#findComment-582429 Share on other sites More sharing options...
mechohaulic Posted 17 hours ago Share Posted 17 hours ago 4 minutes ago, Mark T said: Reversing relay for the puff limiter. "stopped leaking when I set the brakes" == why a puff limiter ?? Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/6/#findComment-582430 Share on other sites More sharing options...
Mark T Posted 17 hours ago Share Posted 17 hours ago It gets air when you release the parking brakes, then meters air to the puff limiter on the injection pump in relation to manifold pressure. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/6/#findComment-582432 Share on other sites More sharing options...
mechohaulic Posted 17 hours ago Share Posted 17 hours ago 8 minutes ago, Mark T said: It gets air when you release the parking brakes, then meters air to the puff limiter on the injection pump in relation to manifold pressure. possibly what's throwing me off (besides the long day/ Yukon Jack ) is the picture posted!! I remember the intake manifold having an air cyl 1 in +- dia with line going to injection pump ; not the picture posted . Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/6/#findComment-582437 Share on other sites More sharing options...
Mark T Posted 17 hours ago Share Posted 17 hours ago 6 minutes ago, mechohaulic said: possibly what's throwing me off (besides the long day/ Yukon Jack ) is the picture posted!! I remember the intake manifold having an air cyl 1 in +- dia with line going to injection pump ; not the picture posted . There's a couple different types 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/6/#findComment-582440 Share on other sites More sharing options...
Smoothy Posted 15 hours ago Author Share Posted 15 hours ago 2 hours ago, Mark T said: It gets air when you release the parking brakes, then meters air to the puff limiter on the injection pump in relation to manifold pressure. Thanks Mark, that makes perfect sense to me now. I've managed to scrounge up the Mack service manual on puff limiters from another thread on the site. What I don't understand now is that if the reverse relay leaking/ bleeding air off into the atmosphere with the brakes released is normal, surely not right? There's no figure showing the different ports on the reverse relay, but it does mention a test port. Is that what is leaking on my relay and simply needs plugged? The only other thing messing with my head on this one is that the control valve appears to be removed. Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/6/#findComment-582445 Share on other sites More sharing options...
Smoothy Posted 12 hours ago Author Share Posted 12 hours ago Well, it took some digging. But this problem was one I invented. Thanks again, BMT forums. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/6/#findComment-582446 Share on other sites More sharing options...
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