loader relief valve

[MichiganIron]

What was the final story on the cracks in the loader frame referenced in the forum?

It was not necessarily a structural issue, which is why KIOTI didn't react to it the way some thought they should. The torque tube had an port hole in the backside with a cover plate to access the hydraulic line connections. The bolt holes for the cover plate were located at the corners of the access port...probably not the best idea. The corners can accumulate stress, which caused minor cracks between the edge of the cut-out and the bolt hole (about 1/2"). There was never a concern on the KIOTI engineers part that the cracks would effect the integrity of the loader, but....the issue got a tremendous amount of attention through the ciber-highway and KIOTI issued a Bulletin to install a reinforcing bracket over the torque tube. We never saw a single loader with more than a minor crack at the corner of the access port. The KL130 Loader was re-designed to a round torque tube. But.....the story will continue to be told around campfires and family dinners for years to come.

 

[chuck172]

I know this is beating a dead horse, but I'm curious. If the Kioti brochure says set the relief valve at 2000 psi. to get Lift Capacity to Full Height at Pivot Pins 1,155 lbs. What happens to the lift capacity when you set the prv at 2550 psi?

 

[J_J]

You gain more lifting potential.

2 in bore , 1 in shaft, 2000 psi= 6283 lbs X 2

2 in bore, 1 in shaft, 2550 psi =8011 lbs X 2

550 psi increase on a 2 in bore and 1 in shaft times 2 = 3456 lbs with a straight on push.

Your cyl are pushing at an angle, so the increase is much less.

 

[oldpilgrim]

sounds like a 22 percent increase. Not bad.

 

[TomSeller]

It was not necessarily a structural issue, which is why KIOTI didn't react to it the way some thought they should. The torque tube had an port hole in the backside with a cover plate to access the hydraulic line connections. The bolt holes for the cover plate were located at the corners of the access port...probably not the best idea. The corners can accumulate stress, which caused minor cracks between the edge of the cut-out and the bolt hole (about 1/2"). There was never a concern on the KIOTI engineers part that the cracks would effect the integrity of the loader, but....the issue got a tremendous amount of attention through the ciber-highway and KIOTI issued a Bulletin to install a reinforcing bracket over the torque tube. We never saw a single loader with more than a minor crack at the corner of the access port. The KL130 Loader was re-designed to a round torque tube. But.....the story will continue to be told around campfires and family dinners for years to come.

Thank you. Internet rumors live on forever it seems.

 

[chuck172]

Well, my bubble is burst. Checked the psi and it is 2600. I guess I'll just have to live with the loader. Sure wish I would have bought the dk40 instead. The ck35 is a good machine though.

 

[Coyote machine]

Well, my bubble is burst. Checked the psi and it is 2600. I guess I'll just have to live with the loader. Sure wish I would have bought the dk40 instead. The ck35 is a good machine though.

And all the more reason to not state incorrect information about possible "inferior" metals, as you did earlier in this thread. BTW, loaded rear tires is ballast. So would be a backhoe or ballast box or box blade, etc.

 

[MichiganIron]

You gain more lifting potential.

2 in bore , 1 in shaft, 2000 psi= 6283 lbs X 2

2 in bore, 1 in shaft, 2550 psi =8011 lbs X 2

550 psi increase on a 2 in bore and 1 in shaft times 2 = 3456 lbs with a straight on push.

Your cyl are pushing at an angle, so the increase is much less.

You will not increase the loader lift capacity beyond the rated 1180lbs by having the relief at the 2550psi. That is the relief setting that the loader is rated at. Brochures aren't always the best source of technical data. The loader is designed and rated at approx. 2500psi.

 

[MichiganIron]

You gain more lifting potential.

2 in bore , 1 in shaft, 2000 psi= 6283 lbs X 2

2 in bore, 1 in shaft, 2550 psi =8011 lbs X 2

550 psi increase on a 2 in bore and 1 in shaft times 2 = 3456 lbs with a straight on push.

Your cyl are pushing at an angle, so the increase is much less.

You will not increase the loader lift capacity beyond the rated 1180lbs by having the relief at the 2550psi. That is the relief setting that the loader is rated at. Brochures aren't always the best source of technical data. The loader is designed and rated at approx. 2500psi.

 

[J_J]

You will not increase the loader lift capacity beyond the rated 1180lbs by having the relief at the 2550psi. That is the relief setting that the loader is rated at. Brochures aren't always the best source of technical data. The loader is designed and rated at approx. 2500psi.

CHUCK172 Said this. If the Kioti brochure says set the relief valve at 2000 psi. to get Lift Capacity to Full Height at Pivot Pins 1,155 lbs. What happens to the lift capacity when you set the prv at 2550 psi?

My answer was to that.

If you raise the operating pressure, you will most definitely increase lift.

Did you read this.

Specifications may vary with tractor model, front axle configurations, tire size option and type of attachment, and are subject to change without notification.

KL130 Front End Loader | Kioti Tractors

 

[chuck172]

Right J_J, I was wondering if Kioti had rated the ck35 max lift to be 1,155 pds. @2000 psi, what would the lift be @ 2550psi.

 

[MichiganIron]

Sorry, JJ's calculation is right on. I was just making sure you knew the KIOTI loader capacity calculation is based on the 2500psi, not the 2000psi. The relationship between pressure and cylinder ram force is as JJ stated,

 

[chuck172]

I understand, thanks all!

 

[Tractor Tom]

Good info Guys, as always this place is a wealth of knowledge!! Thanks

 

[dfkrug]

Brochures aren't always the best source of technical data.

And leave it to Kioti to put the WRONG technical data in a brochure!

In reading this thread, I went to the Kioti website and read the brochure. Sure enough, they quote 2K psi.
I wonder how old this online brochure is? It is hard to find any Kioti brochures that have any pressure specs. I have
a bunch of them here (paper). Most have nothing. A few of the combo FEL brochures quote 2000psi also.
You had to get the service manual to find the correct # (usually 2560).

My CK30 is nearing 10yo, and it has not had the FEL problem, and the pressure was properly set at
about 2500psi. At least the brochures have been mostly consistent about the 1155# max lift cap at
full height since Day One.

BTW, one Kioti backhoe brochure quotes 2466psi for the 2475 hoe, the unit you put on a CK30/35.
Who knows where that # comes from?

 

[Coyote machine]

And leave it to Kioti to put the WRONG technical data in a brochure!
<SNIP>
BTW, one Kioti backhoe brochure quotes 2466psi for the 2475 hoe, the unit you put on a CK30/35.
Who knows where that # comes from?

Ouija board?!

 

[DK35vince]

BTW, one Kioti backhoe brochure quotes 2466psi for the 2475 hoe, the unit you put on a CK30/35.
Who knows where that # comes from?

Backhoes generally have their own relief valve.
My Rhino 85 backhoe has its own relief valve set at 2100 PSI regardless of what tractor its mounted on.

 

[dfkrug]

Backhoes generally have their own relief valve.

Yeah, they do. The point is that if the system pressure is set at 2000psi on the
FEL valve, there is no way the hoe will ever see more than 2000psi.

BTW, my Kioti lists 3 different replacement intervals for the engine oil: 75 and
150 hr on the tractor, and 100 hr in the owner's manual. Kioti's published #s
continue to be inconsistent, contradictory, and often, wrong.

 

[TomSeller]

Yeah, they do. The point is that if the system pressure is set at 2000psi on the
FEL valve, there is no way the hoe will ever see more than 2000psi.

BTW, my Kioti lists 3 different replacement intervals for the engine oil: 75 and
150 hr on the tractor, and 100 hr in the owner's manual. Kioti's published #s
continue to be inconsistent, contradictory, and often, wrong.

This brings up a question I never have been sure of. Does the FEL relieve pressure from the common port ahead of the work ports? What happens if you have your FEL relief set at 2500 psi but your backhoe relief set at 2000 psi. I have always thought that the FEL work ports would limit at 2500 and the hoe ports would limit at 2000. But if you went the other way around and set your FEL at 2000 and backhoe at 2500, everything would limit at 2000 psi.

All this is assuming the FEL is ahead of the hoe in the circuit, and open center valves.

 

[Gittyup]

Some more points of view on the cracked loaders: I'm pretty sure it was never thought to be inferior steel,but rather the design of the big portal hole they put in the crossbar. Made for neat hoses but weakened the loader. The opening had square cut corners which concentrates forces inTo the corners and the cracks begin at that stress point. I'm one whose loader did "fail". Cracks were over 2" long and loader twisted about that much out of level. Kioti replaced my loader with the "B" version (round cross member) and all has be good ever since.