Hiab vehicle

[Bucket on wheels]

's not your average bit of kit though Frank

you might not spot one Everyday But there are a few around

https://www.google.no/search?client...WfmAL4QjJkEegQICBAC&biw=1138&bih=536&dpr=2.25

 

[JD450A]

I’ve seen mounted mowers brake the arm and twist the cross shaft on a 200hp fendt the twin rams are T together so it comes down to the cross shaft to take the strain, so it’s definitely easier to damage them than you think, I really wanted it on the linkage as I could tow a trailer aswell then so I’ll make it work somehow

Thing is a Hiab with Legs isn't going to be applying cross force like a mower or hedge cutter will. Once the legs are down your cross force should be balanced. The bigger issue will be your loading capacities and the potential for the crane to move up as a whole on the "floating" linkage. You could overcome that by fabricating the hitch so the legs keep the frame up and under pressure. There are plenty of timber cranes on linkage mountings, Just make sure the hiab is well planted as it's amazing the forces involved. I'd probably want it on fixed linkage balls rather than Q/R balls too as I could see it popping out under the wrong circumstances with worn linkarms.

 

[Smiffy]

Thing is a Hiab with Legs isn't going to be applying cross force like a mower or hedge cutter will. Once the legs are down your cross force should be balanced. The bigger issue will be your loading capacities and the potential for the crane to move up as a whole on the "floating" linkage. You could overcome that by fabricating the hitch so the legs keep the frame up and under pressure. There are plenty of timber cranes on linkage mountings, Just make sure the hiab is well planted as it's amazing the forces involved. I'd probably want it on fixed linkage balls rather than Q/R balls too as I could see it popping out under the wrong circumstances with worn linkarms.

It won't apply the cross force until you lift one leg up. Pressuring that is an m125l grab crane which is pretty much the standard then it will get 16t of 8 wheeler up on one side. So a 7t tractor isn't going to be much of a challenge. And whilst they do make 3pt timber cranes they no where near the size of that. The biggest botex offers on a 3pt linkage lifts 600kg at 4m if you want bigger you need direct mount . The crane pictured will lift nearly 3t at 4 meters. And if working with timber, the pull in force on the extensions is huge. And the extension pull in doesn't stop working with the overload protection like the lift does. Meaning you can put huge forces through it.
And you have reiterated what I said about the linkages. But it isn't just popping out when worn. The linkages simply arnt designed for upward force, the latches fail in the linkarms is the problem.
There is also the problem that 3 point linkages are designed to be be loose and have movement in them. Even with legs down as you swing from one side to the other you will get movement. Fine if just loading logs but really not useful if doing anything precise.

 

[Mogman]

It won't apply the cross force until you lift one leg up. Pressuring that is an m125l grab crane which is pretty much the standard then it will get 16t of 8 wheeler up on one side. So a 7t tractor isn't going to be much of a challenge. And whilst they do make 3pt timber cranes they no where near the size of that. The biggest botex offers on a 3pt linkage lifts 600kg at 4m if you want bigger you need direct mount . The crane pictured will lift nearly 3t at 4 meters. And if working with timber, the pull in force on the extensions is huge. And the extension pull in doesn't stop working with the overload protection like the lift does. Meaning you can put huge forces through it.
And you have reiterated what I said about the linkages. But it isn't just popping out when worn. The linkages simply arnt designed for upward force, the latches fail in the linkarms is the problem.
There is also the problem that 3 point linkages are designed to be be loose and have movement in them. Even with legs down as you swing from one side to the other you will get movement. Fine if just loading logs but really not useful if doing anything precise.

Don’t worry, we’re talking about @Davedb here precise he ain’t

 

[Davedb]

I’m surprisingly precise sometimes and I’m really wanting this crane for lifting things around the yard atm I use the loader but trying to fit an engine requires a bit of precision I’ll give @Mogman a ring this week im
Sure we can come up with a plan

 

[Shovelhands]

I’m surprisingly precise sometimes and I’m really wanting this crane for lifting things around the yard atm I use the loader but trying to fit an engine requires a bit of precision I’ll give @Mogman a ring this week im
Sure we can come up with a plan

Has Mog not got something big and heavy that used to be at an airport, with wheels and and engine, that you could mount the crane on?

 

[Davedb]

Has Mog not got something big and heavy that used to be at an airport, with wheels and and engine, that you could mount the crane on?

Maybe but I’ve got a log grab and rotator so probably will use it for that aswell if it’s on the tractor plus can put concrete panels in on a job I’ve got to do

 

[Davedb]

Knocked this together the blue channel is of two west feeder wagons I scraped the linkage plate I cut out of the large sprocket of the feeder which was 20mm plate 5ft round
Try the hijab on next job

 

[Davedb]

Plan is to get a big D link in the tractor PUh then run two chains in a V shape to the top corners of the frame that way when I put the legs down it pulls on the hitch and can’t lift the linkage up

 

[Smiffy]

Plan is to get a big D link in the tractor PUh then run two chains in a V shape to the top corners of the frame that way when I put the legs down it pulls on the hitch and can’t lift the linkage up

You could put the top link it the top hole and get a second top link in the bottom hole going downwards. Then you have the screw adjustment for it.

 

[Monkeybusiness]

You could put the top link it the top hole and get a second top link in the bottom hole going downwards. Then you have the screw adjustment for it.

The 3pl would be fixed in one position then (which might not be a problem).

 

[Steve]

Plan is to get a big D link in the tractor PUh then run two chains in a V shape to the top corners of the frame that way when I put the legs down it pulls on the hitch and can’t lift the linkage up

Once you have it all fitted with the chains holding it down to the puh try to remember to not push the raise button on the 3 point linkage as I doubt that it would end well .

 

[Smiffy]

The 3pl would be fixed in one position then (which might not be a problem).

I thought that was the idea ??

 

[Davedb]

Once you have it all fitted with the chains holding it down to the puh try to remember to not push the raise button on the 3 point linkage as I doubt that it would end well .

Long as I use some decent chain that shouldn’t matter saying that the tractor links will lift 10t

 

[JD450A]

Long as I use some decent chain that shouldn’t matter saying that the tractor links will lift 10t

I'd be using some weak chain so it breaks rather than the traccy.

IMHO I'd still put it on the linkage and not secure it. There are other applications of a 3pl that take larger forces, think big reversible ploughs, side mount mowers, etc. I honestly can't see much of a issue.

Just my penneth.

 

[Mogman]

Looks good to me
now when are you coming down to see me and take these supa single wheels with you

 

[Davedb]

I haven’t forgotten got the other project gone this week aswell so I’ll give you a ring mate

 

[Davedb]

I'd be using some weak chain so it breaks rather than the traccy.

IMHO I'd still put it on the linkage and not secure it. There are other applications of a 3pl that take larger forces, think big reversible ploughs, side mount mowers, etc. I honestly can't see much of a issue.

Just my penneth.

Only reason for the chains was to take the slop out of the linkage as I slew side to side but I’ll Try it without first anyway

 

[Davedb]

Got her on fair tool I might put a 3rd leg on the back tho

 

[Mogman]

Got her on fair tool I might put a 3rd leg on the back tho View attachment 49436View attachment 49437View attachment 49438View attachment 49439

Does your tractor hydraulics run it fast enough or are you on a PTO pump

just need a ladder to reach the controls