Gettin a 40ton crane bogged
Submitted: Monday, Nov 26, 2007 at 11:56
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Scoof
We got our 50 ton Tadano Crane Bogged the other day. It weighs 40 Ton.
It drove into postion in the morning no probs, but after the job was completed it was late afternoon and the loose red sand had dried out.
A grader was bought in to pull the crane out but it too got bogged , so next morning a excuvator was bought in .Once the crane got moving it drove out no probs on the damp sand..so did the grader.
So all soft sand jobs are morning jobs now.
The crane driver never let any air out off the tyres, I would of thought it would of made a difference.
He also had no way of putting air into the tyres after either, but we are looking at fitting an outlet into the air
tank now.
Any heavy machinery guys out there , that have let tyres down on big machines, to help with bogging and what pressures would it be safe to go down to.
Cheers Scoof.
Reply By: Ted (Cairns) - Monday, Nov 26, 2007 at 12:31
Monday, Nov 26, 2007 at 12:31
Scoof
Have a look at this:
Tyre pressure control technology for heavy vehicles
From their movies it looks like they go down to 30 psi on 11R22.5 rears.
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Follow Up By: Scoof - Monday, Nov 26, 2007 at 12:52
Monday, Nov 26, 2007 at 12:52
Thanks Ted ,
That was great I have showed all our drivers , Thanks again,
Scoof
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Follow Up By: Muddy doe (SA) - Monday, Nov 26, 2007 at 21:42
Monday, Nov 26, 2007 at 21:42
That is actually a great video to demonstrate to 4WDers the benefits of lower pressures.
Putting aside the differences in vehicle weights involved I can say that I have had similar experiences in comparative testing when our club did a training day in sand. We drove the same course with 40psi and 20psi and the difference was astounding.
Muddy
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Reply By: Member - Doug T (FNQ) - Monday, Nov 26, 2007 at 13:48
Monday, Nov 26, 2007 at 13:48
Had to drive from
Brisbane to Chilago bob-tail once to tow Boral Plant Trailers back , I let the drive tyres down to 18psi and was still upright , but that also was with no weight over the axle, It made the ride smoother both on sealed and off
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Follow Up By: Rock Ape - Monday, Nov 26, 2007 at 14:02
Monday, Nov 26, 2007 at 14:02
That's a hell of a way bobtail, must have felt as though a mule was kicking you every 10 seconds.
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Follow Up By: Scoof - Monday, Nov 26, 2007 at 14:08
Monday, Nov 26, 2007 at 14:08
Hi Doug
I just didn't know if letting the tyres down and driving too far might damage them and at about $1100 each tyre. I didn't want to do the wrong thing.
After watching that video I would not hesitate to drop the pressure now.
Also the driver has fitted a air fitting to both 50 tonners now so we are ready for the soft stuff now.
Scoof.. :-)
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Follow Up By: Member - Doug T (FNQ) - Monday, Nov 26, 2007 at 14:49
Monday, Nov 26, 2007 at 14:49
Rock Ape
Wasn't too bad being a single drive
Scoof
Met the fuel
tank driver at Mungeranie and even loaded he runs only 50psi , He said he rarely gets a puncture running the BT
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Reply By: Kevndeb - Monday, Nov 26, 2007 at 14:44
Monday, Nov 26, 2007 at 14:44
Are you WA and did you ring my hubby on Sunday morning?
My hubby is a crane guy....sometimes I think he should curl up in the cab sometimes....though when he is away...the phone will be switched OFF!
Was it cartonable offence? And did he pay up?
Debbie< who's hubby is flying to
Dampier tomorrow to put a crane together...
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Follow Up By: Scoof - Monday, Nov 26, 2007 at 16:32
Monday, Nov 26, 2007 at 16:32
We told him he owed a carton but that didn't go down too
well.
He said he's buggered if he going to try and dig the crane out all afternoon in the hot sun with his hands and then come back to the depot and then shout a carton.
Maybe we should of waited till he had charmed down a bit. Hmmmm
Scoof...
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Reply By: V8 Troopie - Monday, Nov 26, 2007 at 22:55
Monday, Nov 26, 2007 at 22:55
Now, let me say that I know nothing of cranes but am asking anyway:
Would a crane not be able to winch itself out with the big winch it has to lift things?
Or is that a silly question;-)
Klaus
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Follow Up By: Member - pot hole (SA) - Monday, Nov 26, 2007 at 23:20
Monday, Nov 26, 2007 at 23:20
V8 T
Not really because the jib would have to be raised to get the cable alignment right and the hook weighs about 150 kg not much fun walking that around.
You could do it with a small pick and carry crane I suppose.But once you have a crane bigger than about 25ton the hooks are too big to carry.
Also the 50tonners have a rear wheel width of about 3metres, so it's normally wider than the track so it's also traveling over virgin ground.Normal truck width is about 2.4metres.
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