- 10,350
- 75
- 48
- Location
- Meadows of Dan, Virginia
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There are hundreds of threads/posts showing the old cranetruck on this site, use cranetruck, hiab, knuckleboom, m756, or any other keyword that may be related. I'm not a fan of long threads, so my threads are very much subject related.Crane truck do you have a link to the thread for that truck?
The M756 uses what is referred to as "stiff legs" in the TM. The M756 truck bed is perfect for use with the behind-the-cab mounted crane, leaving enough space for it and with several other added features, like anchor points for snatch blocks.If you mean "M756 pipeline truck", was curious too. I googled it and searched the site and could not figure out what the M756 uses for stabilizers or outriggers... what am I missing?
The hydraulic pump for the crane is driven from a transfer case PTO. The rpm is set with the "throttle" control. Typically, the transmission is in 3rd gear with the transfer in neutral and a rpm setting of 1,200-1,500.Maybe a dumb question, but does the military wreckers have a foot or hand throttle at the controls? I would hate to have another motor to fool with just to run the boom. I've worked on digger derricks and bucket trucks for 25 years and they all run on the trucks engine driven pto. Derricks have foot throttles and buckets have 2-speed throttles, that's why im asking. Their rpm is not always at idle for long periods of time, but sometimes on the side of the road they sit for hours with lights on at idle. Cool looking boom and good luck mounting it.
Ah I see now. Before we went to delivery by crane, we delivered by conveyor truck and it had these stiff leg outriggers too. The biggest problem I ran into with these outriggers is if you change the load characteristics of the truck, you could add too much weight on the stabilizers to pull the pins out in order to stow. Of course you can combat that by swinging the boom as ballast to take the weight off the affected stabilizer, but then your truck is NOT stabilized after you stow the outrigger. That being said...Pipeline truck are just stiff legs at the back. They only slide out enough to drop them down and pin them. The wreckers have 4 legs that do slide out. All are manually deployed...
They do not extend. If you want them to extend past the sides of the truck to maximize the use of your crane, generally, the length of your outriggers is limited by the width of the bed (about 8'). They would be staggered and extend about half their width (4', maybe a little more) so that there is enough outrigger inside the truck to be effectively strong:...Do the out riggers on the pipeline bed extend out past the side of the truck if so how far?
Use a AIR piston to work the pto engagement and a deuce air shift air switch along with the indicator light on the dash.Little bit of an update. I will be going with the transfer case pto for sure. Main reason I will be doing so is because in order to run a separate power source to run the hydraulics I will need at least 22 hp engine to get the 6 gpm at 3000psi that I need. This was determined by calculation by a few hydraulic specialist.
I have found the transferase pto pretty close to me. I will get the whole transfer case it was bolted to for $350. Only thing is it does not come with the linkage to put the pto in and out of gear. Hopefully I can locate one of those easily.Getting closer to start mounting the crane. Will take sever pictures of how I did it. More to come soon!
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