Digga Dave
Active Member
At what point, I'm assuming is tied to weight, does a manufacturer decide to invert the boom rams and why? See pics below for examples.
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Why is it so?
- Thread starter Digga Dave
- Start date
special tool
Senior Member
I think we need a real engineer from Cat to answer this - or else we are gonna get a whole lotta speculatin' in this thread....
Dig-UP
Well-Known Member
I think it has more to do with the location of the hoses. They are easier to plumb up if they are upside down... That is why most of the Liebherr machines are arranged like this.
watglen
Senior Member
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Its got a lot to do with protecting the chrome too. Hoes with the traditional configuration put the rods at the top to help keep them away from debris as the bucket crowds toward the body.
I've never seen a 345 in a face shovel before, sweet!
I've never seen a 345 in a face shovel before, sweet!
AtlasRob
Senior Member
The big one for it are the Germans. See Leibherr and original Atlas machines. The new Terex Atlas Machines have them the shiny side up. Maybe the Cat 5000 series inherited the idea with the technology. :beatsme
AtlasRob
Senior Member
So should a bucket ram be tother way up? :stirthepot
Thats what i've also heard!, I think their was a thread on here somewhere suggesting this!
Digga Dave
Active Member
05cummins wrote
I was always of the understanding that the reason was to do with Break Out force from the cylinders.
Depending on the Plumbing.............there is usually more surface area exposed to the Piston Head on the Barrel side just as there is reduced surface are on the Piston on the Rod End due to the Diameter of the Rod????
That is how it was explained to me by some one who I always trusted as being all knowing! Any other theories.................?
Depending on the Plumbing.............there is usually more surface area exposed to the Piston Head on the Barrel side just as there is reduced surface are on the Piston on the Rod End due to the Diameter of the Rod????
That is how it was explained to me by some one who I always trusted as being all knowing! Any other theories.................?
nzpatch
Well-Known Member
the piston vrs rod thing is what i thought for the most power but the piston is getting the oil nomater what way up the ram is up, isnt it???
It's to facilitate the hydraulic hoses. The larger the hose diameter, the larger the bending radius on them and the more difficult they become to accomidate. Putting the chrome on the bottom does make it more vurnerable to damage but this is an acceptable compromise on the big quarry machines. This would not work on a 3 tonne machine in the rental market but I suppose the operator of a big face shovel is going to be trained and competent enough to look after his machine and avoid chrome damage.
It makes no difference at all to the force the cyclinder will develop. This is a function of the piston diameter and the hydraulic pressure only.
It makes no difference at all to the force the cyclinder will develop. This is a function of the piston diameter and the hydraulic pressure only.
stock
Senior Member
This is the original thread on this subject
look here ,all will be revealed
look here ,all will be revealed
Chris5500
Well-Known Member
I've had a bit too many to drink to explain the main reason (its alot more complicated than you think) but I'll try and get on in the morning before I start night shift :drinkup Theres a few reasons, but like I said, the main one is complicated!
hvy 1ton
Senior Member
That only applies when comparing the force and speed of a hydraulic cylinder pushing or pulling. A cylinder will always have more force pushing and more speed pulling because of the surface area (and volume) that is taken up by the rod. I would put my faith in the hose routing/bend radius being the deciding factor.