Picked up a knuckle boom!!

[cranetruck]

The hydraulic outriggers are very very useful by themselves, lift truck for changing tires, get truck out when stuck, lift truck for headroom when working under it, use outriggers for straightening metal pieces and more.



If no outriggers, look at the M756 pipeline truck for ideas.

 

[Hooty481]

Crane truck do you have a link to the thread for that truck?

 

[cranetruck]

Crane truck do you have a link to the thread for that truck?

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.

More images:

 

[Hooty481]

I had searched and already saw the pictures you posted. I thought it might be something different than what I had already seen that was separated from the crane it's self.

 

[HonkyCat]

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?

 

[F18hornetM]

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.

 

[Hooty481]

Honkycat that is what I wanted to say but I couldn't get it spit out.

 

[cranetruck]

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 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.

 

[cranetruck]

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.

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.

To maintain a constant rpm with a varying load, there is also a mechanical link between the transfer and injection pump, used on some trucks, like the M49A2C tanker that may be fitted.

 

[cranetruck]

Here is a picture of the speed control linkage.

 

[Hooty481]

That's what I was looking for. Do the out riggers on the pipeline bed extend out past the side of the truck if so how far?

 

[Recovry4x4]

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.

Note the attached pic. In the red outlines you can see the drivers side leg stowed. The passenger side is deployed but missing the extension and foot which can be seen on the deck of the truck. On the M756A2 they are only on the back of the truck.

 

[F18hornetM]

Thanks cranetruck very interesting. We have a few dump trucks that run a pto driven air compressor off the transfer case as well, so sorta same set up.

 

[HonkyCat]

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...

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...

For the weight you are able to lift with that crane off of the side of your truck, I would make these slide out and pin, then crank down and pin should you decide not to split your system and add hydraulic outriggers. I would add some jacks (like you would find on an equipment trailer) for adjust-ability and to keep you from having to handle the lower legs which could weigh 25-30 lbs (it is a PIA to hold these in the correct position in one hand while you align the pin with the other hand, especially if you have "tennis elbow" like me). Some inspiration on a smaller scale:

 

[HonkyCat]

...Do the out riggers on the pipeline bed extend out past the side of the truck if so how far?

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:

 

[Hooty481]

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!

 

[MidnightDuramax]

From the calculations I just ran with this website http://www.engineeringtoolbox.com/hydraulic-pumps-horsepower-d_1464.html it looks like you only need 10.5HP.

 

[Hooty481]

That calculation is for an electric motor. You double it for a gas engine

 

[MidnightDuramax]

Ok good to know thanks.

 

[73m819]

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!

Use a AIR piston to work the pto engagement and a deuce air shift air switch along with the indicator light on the dash.