Loader Bucket Breakout Force

[jgriffin1720]

if you flip the cylinder it changes which functions uses the full surface area of the bore of the cylinder. your curl down will be weaker, but curl up will be stronger. Try it out in a hydraulic cylinder calculator.

 

[4570Man]

if you flip the cylinder it changes which functions uses the full surface area of the bore of the cylinder. your curl down will be weaker, but curl up will be stronger. Try it out in a hydraulic cylinder calculator.

Wrong. It’s still retracting the cylinder to curl the bucket up. The only thing that flipping the cylinder might accomplish is wearing the hoses out faster because the body of the cylinder moves now. The ONLY way to accomplish what you’re suggesting is with a fairly extensive fab job and a lever like most wheel loaders use.

 

[Rock Crawler]

if you flip the cylinder it changes which functions uses the full surface area of the bore of the cylinder. your curl down will be weaker, but curl up will be stronger. Try it out in a hydraulic cylinder calculator.

Nope, you are mistaken. Flipping the cylinder end for end changes nothing. The cylinder, no matter what end is where generated the same force in compressing the cylinder. That same linear force is applied during compression to curl up the bucket.

Same thing stands for expanding the cylinder, you get the same linear force applied no matter how you flip the ends, the extending is the stronger of the 2 forces, and this is always being applied to the dumping or curling down of the bucket.

To change this, you would need to physically re-position the cylinder to the bottom of the arms and bucket so that extending caused the bucket to curl up, and retracting (the weaker motion) caused the bucket to dump or curl down.

You can flip end for end all day long and the total compressional or expansion forces of that cylinder will not change. Change hydraulic pressures, piston diameter or outer housing diameter and you can effect the total force applied.

 

[jgriffin1720]

You are right, had a brain fart.

 

[bdhsfz6]

To those who suggested boosting the hydraulic pressure to increase breakout strength, just a follow-up to this post.

I finally retrieved my hydraulic pressure gauge which was on loan to my brother.

On my MX5800 / LA1065 FEL, the pressure tested at 2650#. On my L6060 / LA1055 FEL, it also tested at 2650#. My dealer says this is the pressure they routinely use. The manuals for the LA1055 and LA1065 FEL's list the max pressure rating at 2630#.

Since the existing pressure is already slightly above max, I'm a little hesitant to go much higher. Boosting it by 10% as a few suggest would exceed 2900#. I've read Kubota cylinders and hoses are rated above 3000#. I realize most of these ratings tend to be conservative with a safety factor built in.

The only experience I've had with this was on my old B7100 and B1630C FEL. I was extremely dissapointed with it's strength. I swear I could lift more than that combo. I measured the pressure at a little over 1800# and on the advice of a friend with the same tractor, boosted it to 2200#. I have no idea what the FEL ratings were but it made a big difference in performance. I used the **** out of that little tractor for 15 years and never had a problem.

I'm also concerned with other implements like the BH92. It's manual does not list a max pressure.

Has anyone experimented with pressures higher than rated and if so, how much and with what result?

 

[Rock Crawler]

I know that owners of the little BX commonly buy the pressure gage and shim kit from BXpanded and push pressures 10%-15% and are happy with the performance and there is not a rash of blown cylinders or hoses stemming from that common practice. I pushed mine from 1725PSIG to 1975PSIG with no troubles, but I admit that I did not own that machine long. But when I owned it, I forced it into slave labor that was above and beyond what that poor little thing should have been subjected to.

 

[teg]

...the existing pressure is already slightly above max...

Are you happy with how the tractor works or do you think it feels weak??? Don't change it if it works fine for you... Your dealer is one of the few that maxed out the pressure.

 

[tkevan]

Are you happy with how the tractor works or do you think it feels weak??? Don't change it if it works fine for you... Your dealer is one of the few that maxed out the pressure.

Don't we always think they're weak?:laughing: My breakout at the pins on the Mahindra is almost 5k. Still wish it was stronger.

 

[4570Man]

The bucket breakout force of the Kubota CTL is 7,900 pounds. I don’t get in it and think man this thing is too strong. How do they rate bucket breakout force? Comparing the the Kubota 95-2 to the John Deere 333g the operating weight is close. The tipping load is close. The bucket breakout force on the Deere is nearly twice as high.

 

[teg]

Don't we always think they're weak?:laughing:...

I'm more surprised at the size of rocks and logs I can pick up and move with ease... but I'm not used to running "real" equipment, backhoes and track hoes!

Here is a small one, the 6 foot one was wider than the bucket.
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