Outrigger leg repair: broken safety pin holes

[ichudov]

The outrigger legs on my crane, unfortunately, have holes for the safety pin ripped up, probably due to jack seals leaking at some point. The attached pictures show damage.

I believe that outrigger jack seals are now in decent condition, probably replaced some time ago, however, I wanted to replace them as a safety precaution.

While I have outrigger legs out, I also want to repair the damage to the holes for the safety pin.

My plan was as follows:

1) Take the outrigger jack cylinder out
2) Machine a steel plate with holes, a bit thicker than the original outrigger leg. I can do that with my CNC milling machine.
3) Cut out a rectangular cutout the size of the above plate
4) Weld the new plate in

Do you think that there is any problem or safety concern with the above procedure?

The replacement outrigger legs from Grove are $2,200 each.

 

[Tradesman]

If cost was no object you could have an P. eng. design a repair then have a mag particle test done on it. It sounds like your a competent welder / manufacturer " witch I'm not" you could do the repair and have it tested its not terribly expensive then you know for sure there are no cracks or voids in your welds.

 

[ichudov]

Well, cost IS an object, otherwise I would just buy new legs, at the price of what the whole crane cost me.

I do have a competent weldor, and a very good MIG welder setup.

My main question is, is the safety pin use even required, since they do not seem to be using lock pins in modern cranes?

 

[BobCatBob]

Have you tried buying a used leg? There might be a few parts machines out there.

 

[old-iron-habit]

I wonder how many times the crane driver (certainly was not an operator) had to attempt to force that outrigger up and down with the pin half in to tear it up thru that many holes? I can hear the thought process, " it moves a little more each time so I will keep trying".

 

[td25c]

My thoughts as well old-iron . Also have to watch about workers laying tools on top of the outrigger beam before pulling them in .

I think you are on the rite path repairing the box leg ichudov .

You don't have to use the safety pins as the cylinders have the load check valves on them . I use them most of the time being Grove went to the effort installing them .

 

[ichudov]

td25c, would it be worthwhile to replace the check valves while I do the outrigger jack seals?

With the seals and valves changed, then, perhaps I should not bother repairing the safety pin holes.

 

[td25c]

That would be a good idea to replace the check valve . I did not on my unit but that's where our machines are a little different in design . My check valve bolts to the side of the cylinder base and sticks out the side of the housing at the top . Easy to get to any time .

I believe on your R/T 60 it's all enclosed . Looks like you would have to pull the cylinder to replace the check valve unless I'm missing something . Like the R/T 59 , valve threads in the side of the cylinder base ?


https://www.heavyequipmentforums.co...es-NOT-go-down&p=598571&viewfull=1#post598571

Myself would still go ahead and repair the box tube while I had it all apart .

 

[old-iron-habit]

I would repair them also. Belts and suspenders. If you are ever on a job and OSHA showed up and seen them damaged it would be hard to explain why they are on the machine if not needed. I think your repair plan is a good one. The new plate is locked in and should be invisable unless you really study it close.

 

[ichudov]

old-iron, thanks. I will replace seals, holding valves, and will repair the outriggers too. A few dabs of black grease and the repair will not be visible. I am sure that I can make it stronger than the original, and I do not believe that I will have to use the pins for operation.

In general, when I leave the crane overnight, I lower it on outriggers so that the tires touch the ground and most of the weight is on the tires.

I also retract and center the boom.

 

[shipman]

been there done that, photo taken today repair done a few years ago

 

[ichudov]

Very nice job@! Super! Do you actually use the lock pins? For working or just for parking the crane?

 

[shipman]

Yes I tend to put the pins in, but the crane sits on a concrete slab next the water to lift boats in and out and stays set up with no need to move it. Most of the other work it does is on rubber. Once in a while we set up on the outriggers in the yard elsewhere and I admit I don't always put the pins in. Gerry

 

[shipman]

Also, its nice to know that there are holding valves out the cylinders, thanks td25c

 

[td25c]

Yeah , Nice work shipman !

I was a bit puzzled my self looking at the R/T and not seeing the check valve block on the out side of the out rigger box like on my truck rigs . Can see it on third photo.
https://www.heavyequipmentforums.co...utriger-repack&p=148589&viewfull=1#post148589

Then found a diagram in the R/T manual showing the threaded check valve at the top . Just a little different set up .

 

[ichudov]

td25c, you have a nice wood stove in your post #7 in that thread. ;-)

 

[td25c]

It helps keep Mister Freeze away .

It's that time of year again .