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post #1 of 16 Old 05-21-2019, 05:39 PM Thread Starter
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Why would bucket sag?

I am looking at an older Cub with a DANCO FEL
if left in the up position, the lift arms do not drop...but the bucket does....a lot
.....any ideas what would allow this?
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post #2 of 16 Old 05-21-2019, 06:29 PM
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Re: Why would bucket sag?

Eh, it's just a 'drop in the bucket'.
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post #3 of 16 Old 05-21-2019, 06:29 PM
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It’s fairly common on used and sometimes new equipment to have some drifting. But excessive drifting is probably bad cylinder seals. I’m no expert but this has been my experience

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post #4 of 16 Old 05-21-2019, 06:31 PM
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Re: Why would bucket sag?

I'm not a hydraulics guy, but if it was the cylinder seal, wouldn't it leak. I am more inclined to think it would be the control valve leaking by internally.

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post #5 of 16 Old 05-21-2019, 07:10 PM
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Re: Why would bucket sag?

If you was to remove the hoses on the rod ends of the cyls and cap off the fittings on the cyls then raise the loader back up it would let you know if the cyls seals was bad if the bucket was to still drop.
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post #6 of 16 Old 05-21-2019, 07:59 PM Thread Starter
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Re: Why would bucket sag?

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Originally Posted by 9297oldram View Post
If you was to remove the hoses on the rod ends of the cyls and cap off the fittings on the cyls then raise the loader back up it would let you know if the cyls seals was bad if the bucket was to still drop.
Not sure I am following your method...if I remove the hoses...how would I raise the bucket again?....just push it up by hand?
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post #7 of 16 Old 05-21-2019, 08:05 PM
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Re: Why would bucket sag?

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Originally Posted by MARK (LI) View Post
Not sure I am following your method...if I remove the hoses...how would I raise the bucket again?....just push it up by hand?
Set the bucket on the ground with the end tipped up and a block under it to hold it there. Remove the lower hyd hose or hoses and cap the fittings where the lines were and raise the loader back up so the gravity can pull the bucket back down like it was doing. If it doesn't drop then the cyls are ok, if it drops then the oil is seeping past the seals on the rams.
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post #8 of 16 Old 05-21-2019, 08:35 PM Thread Starter
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Re: Why would bucket sag?

Thank you for explaining
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post #9 of 16 Old 05-21-2019, 08:42 PM
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Re: Why would bucket sag?

I used to work on Forklifts and that's how I'd check the cylinders on them.
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post #10 of 16 Old 05-21-2019, 09:03 PM Thread Starter
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Re: Why would bucket sag?

It sounded like you knew what you were talking about...thank you again....Mark
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post #11 of 16 Old 05-21-2019, 09:30 PM
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Quote:
Originally Posted by poncho62 View Post
I'm not a hydraulics guy, but if it was the cylinder seal, wouldn't it leak. I am more inclined to think it would be the control valve leaking by internally.

TUDOR will likely throw in his 2 cents here soon.
leakin one side of the piston to the other. An internal leak but Iv been wrong before lol

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post #12 of 16 Old 05-22-2019, 02:18 AM
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Re: Why would bucket sag?

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Originally Posted by Shwoody214 View Post
leakin one side of the piston to the other. An internal leak but Iv been wrong before lol
Correct. In this situation, a leaking cylinder does not leak to the outside world. The rod end of the cylinder has less volume than the base end, so there is room for any fluid that does get past the seals.

The most likely culprit is the piston seals. Valves rarely wear out.

The seals, usually O-rings, are available at hydraulic shops and auto parts stores.

Safety item!

However, it shouldn't be parked with the bucket up. The bucket should be grounded when parked, unless mechanically supported. The same as you support your car with blocking or axle stands after raising it with a hydraulic jack.

Seals, fittings, and hoses do not necessarily need high pressure to blow. Sometimes it's simply a matter of enough pressure cycles or years of service to cause their time to be up, or an accidental movement of the valve handle when someone's foot is where the bucket will land.

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post #13 of 16 Old 05-22-2019, 03:24 AM
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Re: Why would bucket sag?

Quote:
Originally Posted by TUDOR View Post
Correct. In this situation, a leaking cylinder does not leak to the outside world. The rod end of the cylinder has less volume than the base end, so there is room for any fluid that does get past the seals.

The most likely culprit is the piston seals. Valves rarely wear out.

The seals, usually O-rings, are available at hydraulic shops and auto parts stores.

Safety item!

However, it shouldn't be parked with the bucket up. The bucket should be grounded when parked, unless mechanically supported. The same as you support your car with blocking or axle stands after raising it with a hydraulic jack.

Seals, fittings, and hoses do not necessarily need high pressure to blow. Sometimes it's simply a matter of enough pressure cycles or years of service to cause their time to be up, or an accidental movement of the valve handle when someone's foot is where the bucket will land.
at my former work place I welded up many of CYL's .. they had to go testing after at pressure of 5000 lbs.. the CYL's had a retracted length of 25 feet.. when fully extended they were 75 feet long.. they were used on 'man lifts'.. the seals in them were not 'O' rings.. but a special shape..

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post #14 of 16 Old 05-22-2019, 01:50 PM
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Re: Why would bucket sag?

I ordered replacement seals for my Case 646 from "Grizzly Hydraulic Seals"
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post #15 of 16 Old 05-22-2019, 02:15 PM
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I hate when my bucket sags. Mark I think they have a pill for that 😉

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