• Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!

  • Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.

Picked up a knuckle boom!!

cranetruck

Moderator
Super Moderator
Steel Soldiers Supporter
10,350
75
48
Location
Meadows of Dan, Virginia
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.

2006 0728 6x6 swapping tires.jpg

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

cranetruck

Moderator
Super Moderator
Steel Soldiers Supporter
10,350
75
48
Location
Meadows of Dan, Virginia
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:hiab crane.jpg2006 0929 sideways winching.jpg2005 0226 6x6  hiab winch (3).jpg2006 0808 6x6 stowing dolly.jpg2006 0816 worksite (5).jpg
 

HonkyCat

Member
36
0
6
Location
Wilmington, DE
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?
 
Last edited:

F18hornetM

Active member
1,135
10
38
Location
Ocean City, Md
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.
 

cranetruck

Moderator
Super Moderator
Steel Soldiers Supporter
10,350
75
48
Location
Meadows of Dan, Virginia
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.

m756 lift jack, out rigger.jpg2005 0425 m756 drawing from manual.jpg2005 0425 m756 fitting bed.jpg
 

cranetruck

Moderator
Super Moderator
Steel Soldiers Supporter
10,350
75
48
Location
Meadows of Dan, Virginia
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.
 

Recovry4x4

LLM/Member 785
Super Moderator
Steel Soldiers Supporter
34,012
1,808
113
Location
GA Mountains
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.
 

Attachments

Last edited:

F18hornetM

Active member
1,135
10
38
Location
Ocean City, Md
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

Member
36
0
6
Location
Wilmington, DE
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:

mobilesurveillance_4_big.jpg
 

HonkyCat

Member
36
0
6
Location
Wilmington, DE
...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:

outrigger 1.JPG
 

Hooty481

Member
707
4
18
Location
Russell County Kentucky
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!
 

73m819

Rock = older than dirt , GA. MAFIA , Dirty
Steel Soldiers Supporter
In Memorial
12,195
320
0
Location
gainesville, ga.
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.
 
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website like our supporting vendors. Their ads help keep Steel Soldiers going. Please consider disabling your ad blockers for the site. Thanks!

I've Disabled AdBlock
No Thanks