Grand L loader issues?? or operation

[J_J]

bucktaker,

The pressure setting will depend on the pump specs, and the relief setting should be about 50 psi below the pumps rated pressure.

Larger cyl will add force, and a lighter/different bucket perhaps.

Engine rpm only has to do with the GPM's developed.

 

[bucktaker]

Well Tractor is still at dealer they reported that the measured pressure was actually 100 psi more than spec it measured 2750psi
They tested it with a gauge and placed the bucket under a heavy object i think he said dock.

So I wonder if the angle of the bucket makes a big difference as I had the cutting edge almost straight down.

I will get the tractor back on monday and see if I can recreate the problem again, if necessary I will go buy a gauge.

 

[VA MTN MAN]

My 5740 seems weak in the curl circut also but the lift feels fine.my4610 has plenty of power in the curl circut. I think the difference in mine is the 4610 is direct pin on bucket and the5740 is quick attach which sits out 6 or more inches further from the pins. I dont think kubota took this in consideration and it makes the curl weak.just my opinion.

 

[bucktaker]

Yes i have the ssqa bucket too

 

[bucktaker]

Got a good deal off Cl yesterday a Cat skid steer 42 pallet forks.

Put the pallet forks on and did some testing with the L5740.
Lifting the arms with forks under a horse trailer rears came off the gound.
Brought forks up and tried to curl the trailer no go not light in rear
placed foks level on concrete floor tried to "dump" and lift the front wheels no go.
Put forks at 45 degree down angle and tried to lift front wheels nope
drove forks into soft grass 6-8 inches could curl the sod out.

Will try the same things with my bucket this wekend. Can some one else try these things to see if the are seeing similar results ?

 

[Grateful11]

Something doesn't sound quite right on the curl of the loader. Our L3940 loaded
right at 40 loads of cow manure in the last 2 days using a IH 155 bushel spreader.
Ours has loaded rear R4's and we had a JD 71 blade on the rear. I can't understand
The 5740 not being able to push these piles either, all our manure handling is done on
concrete, about 8000sq.ft. of it, that's the worst case scenario as far traction
IMO and the L3940 blows our IH 574 away when it comes to production, traction
and ease of operation. The 574 has loaded R1's but get it on concrete with the
narrow 4' manure bucket with manure spikes and get it a little downhill on poopy
concrete and it will barely move itself in reverse. The spreader can be fully heaped in
under 5 minutes with the Kubota. 2/3rds of the manure loaded this week was so
wet it had water running it of it, it had the consistency of pudding. I've been
blown away by the ability of Kubota in the way it handles especially loader operation,
which is used everyday here for moving round bales for 50 head of cattle. I'd
definitely contact the dealer, hopefully he's a good one like we have.

 

[J_J]

Got a good deal off Cl yesterday a Cat skid steer 42 pallet forks.

Put the pallet forks on and did some testing with the L5740.
Lifting the arms with forks under a horse trailer rears came off the gound.
Brought forks up and tried to curl the trailer no go not light in rear
placed foks level on concrete floor tried to "dump" and lift the front wheels no go.
Put forks at 45 degree down angle and tried to lift front wheels nope
drove forks into soft grass 6-8 inches could curl the sod out.

Will try the same things with my bucket this wekend. Can some one else try these things to see if the are seeing similar results ?

Is this the loader you have? Below. If you can't obtain the tilt and lifting weights, then you need to get a hyd gage and check the pump, FEL valve, relief valve, and loader cyl for any leakage.

Look at the break out force, and lifting force. Is it anywhere near what you have seen on your tractor?


Loader:
Loader type: Kubota LA854
Height (to pin): 112.3 inches [285 cm]
Dump clearance: 88.9 inches [225 cm]
Dump reach: 22.4 inches [56 cm]
Dump angle: 45
Reach at ground: 75.7 inches [192 cm]
Rollback angle: 42
Breakout force (at 500mm): 4,195 lbs [1902 kg]
Lift to full height (at pin): 2,489 lbs [1129 kg]
Lift to full height (at 500mm): 1,878 lbs [851 kg]
Bucket width: 72 inches [182 cm]
Attachment style: J2513 Quick-Coupler (optional)
Raise time to height: 4.2 s
Bucket dump time: 2.3 s
Lowering time: 2.8 s
Rollback time: 3.5 s

 

[bucktaker]

JJ
Yes i have the la854 loader.
Dealer checked hyd pressure and reported no issue. measured 2750psi

how do you measure breakout force? lift seems fine and never hits the relief

curl/dump...seems very weak to me cant do a lot of things. i am starting to wonder if it s angle of the bucket that is losing mechanical advantage.
Hope to try it later today as I have to unload some big round bales and fill a feeder.

 

[J_J]

Different people state the breakout force differently. Here is a couple of definitions of breakout force.

Breakout Force @ Pivot Pins
This measurement is taken from the pin locations where the bucket attaches. This is the straight rising action of the loader, under load, lifting material straight up without the bucket.

Breakout Force @ 19.5"€� Forward
This measurement is taken at 19.5 inches forward of the loader arm bucket pin holes. This is the dead lift power of the loader when raising the loader bucket (i.e., scooping dirt from a pile).

Now, what does that mean, with out the bucket.

I always thought it had to do with the angle of the cyl to the bucket. The curl function of the bucket changes the angle of the cyl to the bucket. You will have the most force when the cyl is at 90 to the bucket, as any other angle will provide less force. The further apart the cyl connecting to the pivot pins will also increase the force.

I added your lift and curl weights, and they are very close to the breakout force, so one could say it is the combination of the lift and curl, but normally you can't do both lift and curl.

I would have to agree that the breakout force is using both lift and curl at the same time.

You are simply adding one force to another.

2 in cyl, 1 in rod, 3000 psi = 9,435 lbs pushing straight on.

-----------------------------= 7,069 lbs pulling straight on.
Some tractors use two cyl for the force, so times 2 for the two cyl tractors.

If you have a pressure gage on your hyd system, and you are lifting and curling at the max pressure, and are satisfied, about the only thing you can do is to use a smaller bucket, with less volume.

Perhaps your problem lies elsewhere, as in leaking cyl's.

Perhaps you can observe another same type tractor doing the same thing as what you do, and noting any difference.


You should be able to put your bucket flat on the ground and curl down and reiae the tractor front end.

If you put more weight on the rear, and you try to lift something heavy, does the relief activate?

 

[bucktaker]

Perhaps you can observe another same type tractor doing the same thing as what you do, and noting any difference.


You should be able to put your bucket flat on the ground and curl down and reiae the tractor front end.

If you put more weight on the rear, and you try to lift something heavy, does the relief activate?


JJ
I cannot place my bucket flat on concrete and use dump to lift the front end.
i cannot go from full dump position bucket on ground and Curl back attempting to push tractor back.

I seem to have no problems with lift as rear will come off the ground using lift only.. Curl ??? seems to be angle dependant. More angle less power, less angle seems to work ok.




Lifted large 6x6 rounds bales off a trailer with no issues other than being careful because of light rear end . Could lift no problems curl and dump worked ok with this load as not any work at extreme angles.

I agree I need to check operation with same loader La854 I think its the same loader as a mx5100 uses