front bucket wont curl

[butch3467]

i have a L2850 Kubota bucket wont curl up . this started slow would have to keep moving the joy stick to get bucket to curl up now it wont curl up at all went threw the control valve still no curl replaced bucket rams same problem . I do notice when i tray to raise or lower the bucket the engine will bog down until I release the joy stick . don't know what to do next any help ?

 

[TheOldHokie]

i have a L2850 Kubota bucket wont curl up . this started slow would have to keep moving the joy stick to get bucket to curl up now it wont curl up at all went threw the control valve still no curl replaced bucket rams same problem . I do notice when i tray to raise or lower the bucket the engine will bog down until I release the joy stick . don't know what to do next any help ?

If I undersrand your description you have more than one priblem.

1. The bucket dumps but will not curl
2. The loader bogs the engine down when you raise or lower the boom

Is that correct? Also tell us what the model number of the loader is and what if any other hydraulics are on the tractor. Things like rear remotes or a backhoe

You have a problem with one or more of the hydraulic connections / circuits not the valve or cylinders. The question is which ones.

Dan

 

[North Idaho Wolfman]

I'm going with quick disconnect bad or not seated properly.

 

[TheOldHokie]

I'm going with quick disconnect bad or not seated properly.

Which ones? By my calculus its got to be two or more to produce his symptoms. I am going with tank and power beyond return

Dan

 

[North Idaho Wolfman]

Which ones? By my calculus its got to be two or more to produce his symptoms. I am going with tank and power beyond return

Dan

He said it won't curl up, so logic would be the curl disconnects.
And quite specifically the one that sends pressure on the back side of the cylinder.

Or am I missing something?

 

[TheOldHokie]

He said it won't curl up, so logic would be the curl disconnects.
And quite specifically the one that sends pressure on the back side of the cylinder.

Or am I missing something?

No - we are both guessing. My analysis:

Guessing the model of his loader is LA500 or LA650 and I dont think there are couplers on the work ports. The valve comes off with the loader.

The bucket wont curl but it will dump. Dump is regen so no exhaust oil but curl uses tank for exhaust. If its blocked we get dump but no curl.

Both boom functions unload through relief and are serial so exhaust goes to power beyond. If power beyond is blocked boom is deadheaded against relief.

Those two couplers account for all symptoms.

Dan

 

[North Idaho Wolfman]

No - we are both guessing. My analysis:

Guessing the model of his loader is LA500 or LA650 and I dont think there are couplers on the work ports. The valve comes off with the loader.

The bucket wont curl but it will dump. Dump is regen so no exhaust oil but curl uses tank for exhaust. If its blocked we get dump but no curl.

Both boom functions unload through relief and are serial so exhaust goes to power beyond. If power beyond is blocked boom is deadheaded against relief.

Those two couplers account for all symptoms.

Dan

If the three point works then the PB works, right?

butch3467 does the three point work properly?

 

[TheOldHokie]

If the three point works then the PB works, right?

Yes. So if it works where next? We are out of couplers to blame.

Dan

 

[North Idaho Wolfman]

Yes. So if it works where next? We are out of couplers to blame.

Dan

Agreed
Unless he has a Woods or other aftermarket loader on it and with that the valve stays on the tractor and there are couplings at the valve.

 

[TheOldHokie]

Agreed
Unless he has a Woods or other aftermarket loader on it and with that the valve stays on the tractor and there are couplings at the valve.

Or the boom spool is not serial (older or non'Kubota loader) but still has fast dump in which case all exhaust oil goes to tank. In that scenario a defective tank return coupler would block boom and bucket curl but not dump or 3pt.

Waiting to hear an answer to your 3pt question before I expend any more mental energy

Dan

 

[butch3467]

If I undersrand your description you have more than one priblem.

1. The bucket dumps but will not curl
2. The loader bogs the engine down when you raise or lower the boom

Is that correct? Also tell us what the model number of the loader is and what if any other hydraulics are on the tractor. Things like rear remotes or a backhoe

You have a problem with one or more of the hydraulic connections / circuits not the valve or cylinders. The question is which ones.

Dan

the front bucket wont curl up after the bucket curls down i believe the bucket curls down with really no pressure just from the weight of the bucket .rear of the tractor has hydraulic tilt and forward and sideways for implements no backhoe all other hydraulics work great just the front bucket wont curl up front loader is BF500 . hydraulic controller number 21020-32024 / 86-06 /600

 

[TheOldHokie]

the front bucket wont curl up after the bucket curls down i believe the bucket curls down with really no pressure just from the weight of the bucket .rear of the tractor has hydraulic tilt and forward and sideways for implements no backhoe all other hydraulics work great just the front bucket wont curl up front loader is BF500 . hydraulic controller number 21020-32024 / 86-06 /600

Not rocket science. Disconnect the hose connected to the rod end of the right bucket cylinder. Put the hose in a bucket, start tractor, and move joystick to curl. You should get a stream of oil from hose. Let us know what you find and I will tell yoy where to go next.

Dan

 

[butch3467]

Not rocket science. Disconnect the hose connected to the rod end of the right bucket cylinder. Put the hose in a bucket, start tractor, and move joystick to curl. You should get a stream of oil from hose. Let us know what you find and I will tell yoy where to go next.

Dan

when you say rt is that looking at the tractor or sitting in the tractor

 

[TheOldHokie]

when you say rt is that looking at the tractor or sitting in the tractor

Sitting on tje tractor. It really does not matter - which ever is easiest and will make the least mess.

Dan

 

[butch3467]

when you say rt is that looking at the tractor or sitting in the tractor

pulled each hose off on rams and let the fluid run into the bucket one top hose had some air in it retested still no curl

 

[TheOldHokie]

pulled each hose off on rams and let the fluid run into the bucket one top hose had some air in it retested still no curl

We are not looking for air or anything related to the base end hose.

Did you get oil from the rod end hose when you moved the joystick to curl? That specific combination

Dan

 

[butch3467]

yes there is oil coming out rod ends . i did notice there is not a lot of pressure as you would think .the loader is a BF500 no quick connects on that .there is one at the bottom of the pump box were all the hoses connect and run to the controller that quick connect goes to controller [ is that the feed into the controller from pump] there is a hose on the other side of controller to the pump [return line?] also on the same line there is a valve with a little knob on it no idle what that is for

 

[butch3467]

If the three point works then the PB works, right?

butch3467 does the three point work properly?

yes the three point work perfectly

 

[butch3467]

is there a screen some where in the hydraulic system besides the spin on filter that could be plugged like some tractors have

 

[TheOldHokie]

yes there is oil coming out rod ends . i did notice there is not a lot of pressure as you would think .the loader is a BF500 no quick connects on that .there is one at the bottom of the pump box were all the hoses connect and run to the controller that quick connect goes to controller [ is that the feed into the controller from pump] there is a hose on the other side of controller to the pump [return line?] also on the same line there is a valve with a little knob on it no idle what that is for

I am trying to simplify this and you are making my head swim.

Please answer yes or no:

Do you get oil out of the one and only rod end hose when you move the joysrick to curl?

Assuming the answer to that was "yes" perform the next test. Put the bucket in full dump position. Then disconnect the bucjet base end hose from the valve and put it in a bucket. Stat the tracyor and movecjoystick to curl.

Now yes or no: - did thr bucket curl?

I wll be amazed and utterly confused if it did not but I dont like guessing and this is an easy next step. Plus it will help you understand the operation of the system and how to sytematically diagnose problems.

Dan