View Single Post
  #9   Report Post  
Old May 18th 11, 04:44 AM posted to rec.crafts.metalworking
Ignoramus31865 Ignoramus31865 is offline
external usenet poster
 
First recorded activity by DIYBanter: May 2011
Posts: 7
Default 5000 lbs crane on a 3/4 ton pickup

On 2011-05-18, Pete C. wrote:

Ignoramus31865 wrote:

On 2011-05-18, Gunner Asch wrote:
On Tue, 17 May 2011 20:17:13 -0500, "Pete C."
wrote:


Ignoramus31865 wrote:

I have a GM 3/4 ton pickup.

I won, in an auction, a "Ramco RM5000" crane. This crane is similar to
the Harbor Freight truck crane, but is a lot beefier.

It is pictured he

http://igor.chudov.com/tmp/Ramco-RM5000-Truck-Crane.jpg

(not mine, but an identical model).

This is rated for 5k pounds, I am sure for the boom fully retracted.

It has a 8,000 lbs jack. I will put in a longer boom too, and a
winch. I am aware that extending the boom will decrease capacity
proportionally, so a boom that is 4 foot would decrease capacity of
the crane to, say, 1,500 lbs or whatever. I have to call the mfr to
find out. This is stillw ay better than my HF crane.

I have a very large 3/4 inch steel plate, I would say 3x4 feet, that
is rusting in my backyard.

What I thought of doing, is making a cutout on the plate to fit around
a wheel well, and mount it in the back of the truck's bed, and put the
crane on top of it. The Ramco crane would sit in the rear right corner
of the bed, just like this Harbor Freight crane does now:

http://goo.gl/KAN0Y

It has to be a large plate, to spread the weight of the crane and the
levering action that its base would apply to the bed. This particular
plate weighs around 300 lbs and is large enough.

My question is, what sort of constraints do I still have. I would hate
to overturn my truck, break suspension, etc. I would also think that
for heavy lifting, I would need to jack up the right rear wheel too.

Any practical opinions?

i

A crane with that weight capacity really needs to be mounted to the
frame, not to pickup bed sheetmetal. I think typically it would be
mounted with a beefy bracket under the bed to the frame. A support leg
(trailer jack) for the corner of the truck with the crane is common for
the heavier cranes so you don't apply a concentrated load to the
suspension on one side of the truck and also to stabilize it so it stays
level during the lift instead of tilting to that side.

I agree with Pete 100%


So, what I think I will do is

1) Use that big 3x4 foot plate
2) For heavy lifts, I would jack the right rear side of the truck.

I will make sure to jack the plate area, to relieve the bed of too
much stress.

Make sense?

i


I think you could bracket the crane to the frame along with providing
for a swing down trailer jack mounting in that bracket for less added
weight than the big plate and faster / easier jacking. It would of
course require some design time, cutting parts and welding to make the
bracket. A 5k rated trailer jack shouldn't be too expensive.


Bracketing the crane to the bed is a gargantuan task. I cannot weld to
the frame and the area is full of various things.

i