Ford 770B loader bucket won t curl: New Holland Tractor Review  -- New Holland Tractors Discussion Forum and Review Ford 770B loader bucket won t curl: New Holland Tractor Review -- New Holland Tractors Discussion Forum

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 04-06-2003, 20:03 Post: 52683
Jsheds



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 Ford 770B loader bucket won t curl

I've got a 1510 Ford with a 770B loader. I was using it to move some logs around today and putting them in a pile. To stack them on top of one onother I was pucshing and lifting at the same time. Worked great for a few hours.... Now I can't roll the bucket up or down. The loader lifts OK, the 3-point lifts OK, but when I try to tilt the bucket up or down, the cylinders only move about two inches. They are stuck almost closed. If I use the bucket to lift the front end of the tractor off the ground and then try to tilt the bucket up, I can get the cylinders to close all the way, but then when dumping the bucket they still only go about 3". I tried chaining the top of the bucket to a tree stump and backing up to roll the bucket down, but it'll still only go about 3". I disconnected the cylinders from the bucket and tried to extend them without the bucket attached and no luck. I disconnected the hoses from the cylinders and tried to move the rod in and out manually, but couldn't move either one at all. Is it possible that I bent the rods on BOTH cylinders at the same time? It's the only other things I can think of. Can a hydraulic shop straighten the rods, or are they shot? I can't call the dealer until tomorrow, anyone know what these cylinders cost?

As always, thanks for any help.

Jim






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 04-06-2003, 23:13 Post: 52697
DRankin



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 Ford 770B loader bucket won t curl

Every time that has happened to me I have had a quick-connect fitting come partially undone. Doesn't take much of a disconnect..... just a 16th of a inch or so will do exactly what you describe.






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 04-07-2003, 06:36 Post: 52704
TomG

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 Ford 770B loader bucket won t curl

Yikes! I hope you haven't damaged the cylinders trying to move the bucket. MarkH's comment is likely the explanation, and the solution would be to simply find which quick-connect wasn't seated and reseat it.

Reseating one in this situation might prove a bit difficult. If there was a load in the bucket when a quick-connect comes apart then there may be high pressure in the hose to that loader cylinder. Mild versions of the same thing cn happen with an implement that's disconnected on a cool day and reattached on a hot day.

Pressure in a line often prevents seating a quick-connect. The solution is to relieve the line pressure, and that's done by manually depressing the ball in the connector end. A rag is wrapped around the end (because you get a squirt of oil that can be under enough pressure to injure you and it's also messy). For male connectors, a the ball can be pushed against something hard. Female connectors need something fairly soft like a brass drift punch to go into the end to reach the ball. Higher pressure problems usually require the ball to be hit with something fairly soft or the fittings loosened until the pressure can bled off. It can be tough trying to loosen fittings on a hose that contains pressure though.

There is a small bug in the system here that prevents use of the pop up reply window for messages with a ( ' ) in the subject.






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 04-07-2003, 07:27 Post: 52707
Jsheds



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 Ford 770B loader bucket won t curl

I thought about the fittings, but hadn't checked them yet. If the fittings were the culprit, I'd think If I disconnected the hoses to the cylinder, I should be able to manually move the cylinder rod. Or is it so tight a fit that I can't move it by hand?






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 04-07-2003, 08:00 Post: 52717
TomG

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 Ford 770B loader bucket won t curl

Yes, probably they should move by hand. The weight of the loader itself ordinarily is enough to move to bucket. If a bucket is set on the ground with the lift in float, then operating the curl valve to open the return line should allow the bucket to flatten out. The valve should be moved in both directions unless you're sure which hose is the return line for the direction the bucket will move when it flattens out. In addition, the lift does have to be in float. Moving all valves in both directions to relieve line pressure when shutting down a tractor is good practice anyway.

To test and be certain of the results, both quick-connector fittings could be removed and the hose ends stuck in a bucket to catch the oil. A bucket can't move if either hose is closed. Doing it that way eliminates the spool valve as the problem, and quick connectors have been known to fail on their own. I keep spare quick-connectors around, so I'd probably just try to put spare female connectors on to my male hose ends without removing the fittings.






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 04-07-2003, 08:18 Post: 52719
marklugo



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 Ford 770B loader bucket won t curl

This was a problem on the older 770's. Try to direct connect your hoses by removing your quick couplers and use a straight galvanized fitting to reconnect. If this works, It is in the quick couplers. Also some backpressure was observed from time to time on the control valve. It would"lock" the contol handle and make it difficult to move. Only new valves would remedy this. All Ford would do was aknowledge problem but had no solution for this. Maybe now they might have a service bulletin on it. Go to your local dealer and have him to a search for a technical bulletin on this loader /tractor.






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 04-07-2003, 09:56 Post: 52724
Jsheds



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 Ford 770B loader bucket won t curl

"Float" position? I don't think I have this option. My loader has the joystick control, not two lever, havn't found a 'float' position yet, but it sure would be handy!

I'm going to check my quick couplers first. Now that I think about it, the loader frame does wobble around a bit and is right next to the couplers. It wouldn't take much to nudge that coupler enough to knock it loose.

I priced the cylinder from NH - $299! Sounds kind of pricey, but they've got you. If it is a cylinder problem, I can replace the rod and seals for about $130.

I recently changed my hydraulic fluid from the stuff that looked like mayonnaise to the correct Ford 134 fluid, now things are starting to leak. Most notably the control valve for the loader. Is there a service kit to replace the seals on the control valve, or do I need to order all the small parts seperate?
Jim






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 04-07-2003, 10:05 Post: 52725
plots1

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 Ford 770B loader bucket won t curl

float is achieved by pushing lever all the way forward. at least thats how my 790 is set up.






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 04-07-2003, 16:57 Post: 52735
Jsheds



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 Ford 770B loader bucket won t curl

Thanks for your thoughts, the problemn is solved. The one quick coupler right next to the loader frame was not properly seated. Everything seems to be working just fine now. And as an added feature, I discovered I do have the float option, but you have to push the stick pretty hard to get it to lock in.

Jim






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 04-08-2003, 04:59 Post: 52764
TomG

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 Ford 770B loader bucket won t curl

That's a good result and fortunate that nothing was damaged. However, I wouldn't be surprised if there was a bit of leak down now since there may have been a lot of pressure developed in the cylinders. Any circuit pressure relief valves would be in the valve assembly and only one side of the cylinders would be connected to the valve. Fortunately leak down is more of an aggravation in the lift than in the bucket circuit.

The same thing has happened to me often enough that I recognize the signs now. When it happens to me, there's usually enough pressure in the line that I have to bleed it off before I can connect the quick-connect. It also took me almost four years to discover a float on my backhoe boom. We're all in the buz of learning.






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