- Location
- Springfield MO
Great post you guys.
Crane Cribbing
- Thread starter chris_girard
- Start date
- Location
- Billerica, MA
- Location
- Billerica, MA
- Location
- Billerica, MA
- Location
- Billerica, MA
- Location
- Asheville,NC
wild....what was the radius/heavy pick
treevet
Branched out member
- Location
- Cincinnati, Ohio
No rr stabilizer?
- Location
- Billerica, MA
[ QUOTE ]
No rr stabilizer?
[/ QUOTE ]
?
No rr stabilizer?
[/ QUOTE ]
?
treevet
Branched out member
- Location
- Cincinnati, Ohio
- Location
- Billerica, MA
not sure what rr means,
it does have a right rear outrigger
...rear rear? no larger cranes tend not to have a center rear outrigger.
it does have a right rear outrigger
...rear rear? no larger cranes tend not to have a center rear outrigger.
treevet
Branched out member
- Location
- Cincinnati, Ohio
Sorry, I thought that just common short hand I use all the time on ests., contracts, etc.....ft. rr. bk. sd.
We have subbed a 30 ton boom truck over decades that has a rear mount with a rear stabilizer and I have subbed and rented many pretty large other truck booms that are front mount and have a front stabilizer I assumed for working over the front.
To me most work is done on front and rear mount truck booms over the rear of the unit but if a front mount you have imbalance over the front (when working over the cab) so I thought this the reason for the front stabilizer. The rear mount I assumed usually had a rear stabilizer and less need for a front stabilizer because of (rear boom) counter weight on front picks. Cranes obviously have counterweights. We have full chart over the cab.
Maybe yours is for setting up with the tires off the ground for support of the frame like in the picture?
We have subbed a 30 ton boom truck over decades that has a rear mount with a rear stabilizer and I have subbed and rented many pretty large other truck booms that are front mount and have a front stabilizer I assumed for working over the front.
To me most work is done on front and rear mount truck booms over the rear of the unit but if a front mount you have imbalance over the front (when working over the cab) so I thought this the reason for the front stabilizer. The rear mount I assumed usually had a rear stabilizer and less need for a front stabilizer because of (rear boom) counter weight on front picks. Cranes obviously have counterweights. We have full chart over the cab.
Maybe yours is for setting up with the tires off the ground for support of the frame like in the picture?
treevet
Branched out member
- Location
- Cincinnati, Ohio
[ QUOTE ]
...
[/ QUOTE ]
Maybe you can explain something else to me Marquis. I see the set up with the rigs outside the drive but....
why the jacked up way off the wheels set up? I can see the front or back off the driveway for leveling front to back but seems to me the lower the truck the lower the center of gravity...the more stability? You get as wide a reach on the rigs as poss. then level either the front or back and leave truck as low possible?
Off to work...later.
...
[/ QUOTE ]
Maybe you can explain something else to me Marquis. I see the set up with the rigs outside the drive but....
why the jacked up way off the wheels set up? I can see the front or back off the driveway for leveling front to back but seems to me the lower the truck the lower the center of gravity...the more stability? You get as wide a reach on the rigs as poss. then level either the front or back and leave truck as low possible?
Off to work...later.
- Location
- Billerica, MA
Is the crane with the center rear outrigger A frame style?
Our crane has a full 360 chart it doesnt matter where we work off.
in the picture of the white sterling all jacked up it is so high because the driveway is very steep and there is a 3 foot high wall in the back the riggers need to clear
The cg answer is too much to answer from my phone
Our crane has a full 360 chart it doesnt matter where we work off.
in the picture of the white sterling all jacked up it is so high because the driveway is very steep and there is a 3 foot high wall in the back the riggers need to clear
The cg answer is too much to answer from my phone
- Location
- Billerica, MA
[ QUOTE ]
wild....what was the radius/heavy pick
[/ QUOTE ]
I can't remember exactly but I know both jobs had a nice combination of far reaches and heavy picks
wild....what was the radius/heavy pick
[/ QUOTE ]
I can't remember exactly but I know both jobs had a nice combination of far reaches and heavy picks
classictruckman
Participating member
- Location
- Ottawa Valley, Ontario, Canada
Unless the notes in the load chart say otherwise you should setup with the tires just off the ground, the axles and tires are calculated into the load chart as counterweight.
As far as the CofG question is concerned as long as the CofG is some where on the opposite side of the outriggers to the load then your rig will stay dirty side down, its when it moves to the same side that you will have a problem.
As far as the CofG question is concerned as long as the CofG is some where on the opposite side of the outriggers to the load then your rig will stay dirty side down, its when it moves to the same side that you will have a problem.
- Location
- Longmont, CO
Attachments
treevet
Branched out member
- Location
- Cincinnati, Ohio
[ QUOTE ]
Unless the notes in the load chart say otherwise you should setup with the tires just off the ground, the axles and tires are calculated into the load chart as counterweight.
As far as the CofG question is concerned as long as the CofG is some where on the opposite side of the outriggers to the load then your rig will stay dirty side down, its when it moves to the same side that you will have a problem.
[/ QUOTE ]
Staying in the charts (load chart as related to the green log weight chart) is somewhat science in the former and debatable in the latter chart. Very hard to accurately weigh some picks in your head esp. given foliage weight.
Then enter shock load which some say figured into the large Cali tipover. The C of G can veer suddenly off the chart with shock load. Experience and insight and intelligence are so important related to this instance.
Unless the notes in the load chart say otherwise you should setup with the tires just off the ground, the axles and tires are calculated into the load chart as counterweight.
As far as the CofG question is concerned as long as the CofG is some where on the opposite side of the outriggers to the load then your rig will stay dirty side down, its when it moves to the same side that you will have a problem.
[/ QUOTE ]
Staying in the charts (load chart as related to the green log weight chart) is somewhat science in the former and debatable in the latter chart. Very hard to accurately weigh some picks in your head esp. given foliage weight.
Then enter shock load which some say figured into the large Cali tipover. The C of G can veer suddenly off the chart with shock load. Experience and insight and intelligence are so important related to this instance.
Courierguy
New member
- Location
- Idaho
Very cool pic, looks stable too, a lot of work no doubt, as the outriggers would run out of travel of course and you'd have to block under the wheels to get another bite....
a lot of work but you do what you have to, great pic!
a lot of work but you do what you have to, great pic!
treevet
Branched out member
- Location
- Cincinnati, Ohio
You just have to be more careful cribbed up like that. If it falls off it won't be pretty. Back in 1980 when I first started renting out cranes and nobody else was using cranes for takedowns, I slid a 19 tonner boomed out 80 feet over the back 30 feet down a steep concrete driveway and almost got to the primaries.
No harm done and even the scratches on the drive were minimal. After that sometimes I took to attaching a dump truck to the cranes on the uphill side with chains.
Few years ago a sub I use had a 30 ton boomed out over a hundred and twenty foot oak and he couldn't see me very well and I thought I got the nod. He was cribbed up like that and I let her fly and it gave some shock load on the butt and he told me he saw his life pass in front of his eyes. We got a laugh out of it afterwards.
It is great to have forums and threads like this for learning. I feel I started in the wild west days. I invented everything I did and improvised as I went along. It was a scary job sometimes, esp storm stuff.
No harm done and even the scratches on the drive were minimal. After that sometimes I took to attaching a dump truck to the cranes on the uphill side with chains.
Few years ago a sub I use had a 30 ton boomed out over a hundred and twenty foot oak and he couldn't see me very well and I thought I got the nod. He was cribbed up like that and I let her fly and it gave some shock load on the butt and he told me he saw his life pass in front of his eyes. We got a laugh out of it afterwards.
It is great to have forums and threads like this for learning. I feel I started in the wild west days. I invented everything I did and improvised as I went along. It was a scary job sometimes, esp storm stuff.
- Location
- Billerica, MA
Sliding cranes are always a good time. I was setting up a GMK3055 one day on a slight grade, a salesmen had insisted try out a set of DICA pads,. The outrigger controls are on the side of the crane. I was on the down side of the crane and had just gotten the tires off the ground when the whole crane side towards me... never used them again. I have had similar experiences with alturna mats.
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