doubleclutchinweasel

I figure somebody is looking through the old posts for a similar problem, hopefully with a solution attached. And, if they don't find one, maybe they tag onto a post that is close and hope for an answer? Might be better to just start a new thread for the exact problem. Might catch more attention, and hopefully cause less confusion. Anyway, I'm bettin' one of you guys can help the man out!

I was assuming we were talking to the guy (Dave G) in the new post with the 10-speed.

Synchro or air cylinder? Maybe?

Mine is from a couple of places. First of all, "weasel" is a pet word of mine. Where some folks refer to something as a "gizmo" or a "doodad", I use "weasel". I also tend to "weasel around". Just an all-around useful word! But, the origin of DCW is from the 1965 Del Reeves song, "Girl on the Billboard", in which Del refers to himself as a "double clutchin' weasel". I guess that line had a bigger impact on me than I would have thought back then!

Never heard back from him? I was curious about that one. Did sound a whole lot like a hydraulic lock, didn't it?

I did not know you had an equipment escort service. I see escorts running by here all the time on I-40. Very valuable service.

Thought this might be fun. Anybody care to share the thought process behind their user name? Might be some funny stories to go along with them.

Friend of mine went into an auto parts store a few years back, and asked for a Heli-Coli kit. Honest to God, they asked him what car it was for.

I'm not all that up on hydraulics used in trucks. I'm just basing that on what I see in commercial hydraulics...primarily in industrial applications. That's what I'm more familiar with. That's why I said I was not about to argue with you guys that know more about it than I do!!!

That's what I was used to seeing, but was not going to argue with someone who knew more about it than I did! The valve would work essentially the same, though.Would dump "A" to tank but have no pressure going to "B" when lowering. Thanks, T.

There ARE, indeed, 2 different R600 hood lengths. Early is 52.5", I believe and the late is 54.25", or somewhere thereabouts. That's only about 1.75" difference, though. The hoods attach to the radiator supports at the front. There is some adjustment there. Older ones had rods connecting the top of the radiator to the cab. These could affect the way the hood fit at the cowl. I think yours is different than that, though. I'm sure somebody on here can help you with the details. Oh, and welcome to the Dog Lot!

Told ya' they would chime in! LOL!

Texas boy, worked for Mack, and has an R-model. Pretty dang good combination! Welcome to the Dog Pound.

That's kinda why I asked that last one, O!

Based on what Onyx said, I would assume that one end of the valve ports pressure to "A" and dumps "B" to tank, and the other end ports pressure to "B" and dumps "A" to tank. The middle position would be "blocked", so it would stay in place wherever you left it. The only way it could leak down would be fluid leaking out of the side that is pressurized while lifting the bed...like past the piston. A leaky rod seal on the other end, as he said, would not allow fluid to escape. So, it would not cause leak-down.

Can you jack up a wheel on the front axle, leave the rear axle on the ground, put it in neutral, and see what happens as you turn the driveshaft by hand?

Sorry. Your last post came through while I was typing mine. Since it is a Mack setup, some of the guys on here will be able to talk in detail about the way it should work.

The valve probably has a "blocked" position when the lever is in the "hold" position. Generally, a hydraulic valve has 3 positions. Applying that common valve thinking to a dump truck, one position would port pressure to the cylinder, the middle position would hold what ya' got, and the third position would dump the fluid in the cylinder back to the tank. There are variations on this, of course. Some have an "open" center position instead of a blocked center. But, anyway, most valves/manifolds have an "A", "B", "Pressure", and "Tank" port. Shifting the valve connects these in various combinations to accomplish the desired effect. But, that's just generic hydraulic valve stuff. If the truck setup is different, I'm sure someone on here will chime in and correct it for me! If they do, use their info, not mine!

Are there any drive setups that use a "straight-thru" drive shaft (no inter-axle differential)? If so, then ANYTHING wrong in the front drive would cause it to do nothing, but still let the rear axle drive. Like, broken spider gears, side gears, ring/pinion. If there IS an "open" inter-axle differential in there, then a broken front drive should just allow the front driveshaft to spin and do nothing. In that case (with everything intact), if you jack up ANY wheel and put it in gear, that wheel would spin all day without the truck moving. That same setup, with an optional inter-axle differential lock, would give you the option of locking the IAD and forcing the rear axle to drive as well as the front. With some type of torque-biasing power divider (like what I suspect 67RModel is talking about), I suppose a broken front drive could still allow the rear drive to move somewhat, because of the effects of the "automatic" power divider. Still, more information as to exactly what setup is in there would help the guys on here narrow it down for you. What kind of truck is this even in? Pictures always help, too!

Definitely! And, there are many others.

Got any more information? Type of truck? Type of axles? Power divider or not? There are some great technicians on here, so the more info you give them, the better.

Heartfelt condolences and prayers to the friends and family.

Vmac! Definitely did not mean to slight him! You guys are being way too kind to include me in that group! I'm old and my knowledge is pretty limited, compared to "The Brain Trust". Now, if you want to talk about manufacturing roller bearings, we can talk! LOL!

I said it before and I'll say it again... The amount of knowledge a handful of guys on here have among them is freakin' amazing. Mechohaulic, Macktech, Jo-Jo, Glenn, and Onyx just to name a few. There are several others, too. Didn't leave anybody out on purpose. There's not much that gets by those guys.

That's what I'm thinking. The broken rings may have been a secondary symptom. Melting pistons points to a combination of too much timing and too lean a mixture. There's nothing like having Wiseco dripping out of the exhaust pipe! Sounds like he has a plan for the next go-round though!