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1975 Ford 4500 Backhoe problem

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Edward

10-08-2002 07:04:17




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I am having trouble with the main boom on my hoe. when I try to push it down the tractor really struggles. It moves but very very slowly,.. coming up it goes normal. I replaced a hose yeterday in that line do to leakage. Do I need to bleed the lines ? Any suggestions ? Thanx.

Edward




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clark

10-08-2002 13:41:25




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 Re: 1975 Ford 4500 Backhoe problem in reply to Edward, 10-08-2002 07:04:17  
bob, did you replace the hose with the exact same hose and fittings?? a smaller hose will restrict the flow of oil and cause a preasure build up and make the machine grone when you let the boom down,, the boom shouls go down without causeing any load on the engine..



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Edward

10-08-2002 14:07:15




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 Re: Re: 1975 Ford 4500 Backhoe problem in reply to clark, 10-08-2002 13:41:25  
Yes sir,.. I took the hose that had blown out and had an exact match made to replace it. And yes,. I would think the downward motion would be the easiest of the two,.. however,. I am having no luck at this point. I will keep trying. Thanx :o)

Edward



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Bob /Ont.

10-08-2002 08:15:56




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 Re: 1975 Ford 4500 Backhoe problem in reply to Edward, 10-08-2002 07:04:17  
Ed, I don't know much about your tractor but here are some things to think about. 1 If you lift the boom up in the air will it stay there or does it drift back down right away when you put the lever in HOLD? 2 When you lower the boom, does the tractor struggle to lower it before the bucket hits the ground? 3 Do you hear any squeeling sounds when you are lowering the boom and the tractor struggles? Come on back and I'll talk more about it.
Later Bob

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Edward

10-08-2002 14:11:04




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 Re: Re: 1975 Ford 4500 Backhoe problem in reply to Bob /Ont., 10-08-2002 08:15:56  
Bob,..no the boom does not fall at all when in the up position. However,...the tractor struggles badly to lower the boom and there are squeeling sounds the entire time I try to lower it. Is this making sense ? It sounds like you might have some suggestions ? I appreciate any help you can throw my way. Thanx.

Edward



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DickTN

10-08-2002 14:43:10




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 Re: Re: Re: 1975 Ford 4500 Backhoe problem in reply to Edward, 10-08-2002 14:11:04  
I'm no expert on your tractor, but if you are hearing a squealing sound when you try to lower the boom, it indicates that there is a significant restriction somewhere. If you can get someone to operate the hydraulics for you, it may be possible to hear where the squeal is coming from. Since you just replaced a line, this would be the most logical place to look. Do you by any chance have any flow controls on the cylinder ports that may have been disturbed? Another place to look is the return line from the cylinder. Since you say the system loads down when you try to lower the boom, the noise you hear may well be oil going over the relief valve. These will squeal as you describe. If this is the case, it still indicates a restriction either in the pressure to the cylinder or in the return line from the cylinder.
One other possibility is a mechanical bind, although you say the boom will raise OK. Sorry for the wordy post, but I was trying to give you as many things as I have seen on hydraulic systems. Good Luck DickTN

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Edward

10-08-2002 14:50:48




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 Re: Re: Re: Re: 1975 Ford 4500 Backhoe problem in reply to DickTN, 10-08-2002 14:43:10  
Wordy does not bother me at all !!! I need all the advise I can get. Be it short and sweet of long and winded. I am an electronics technician and hydraulics is a word I can barely spell. haha anyways,.. thanx !!!

Edward



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Bob /Ont.

10-08-2002 16:45:03




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 Re: Re: Re: Re: Re: 1975 Ford 4500 Backhoe problem in reply to Edward, 10-08-2002 14:50:48  
Well Ed, just think electrical not electronic, they work very similarly. Now from what you say the fluid is being restricted coming out of the cyl,like a Resistor. Some one mentioned a flow restrictor on the cyl, it could have one and it would look like a long fitting. I have seen people turn them because it was easier than turning the nut on the hose end and tighten them right up and do what you have, they also have a check valve in them, Diode, and will not effect raising the boom. If you have a strange fitting that you might have turned, lower the hoe to the ground move the levers with the engine off. Then loosen the hose where it connects, then turn the piece of the fitting as far as you can, reconnect the hose and try it. Don't lift the boom too much at first, you don't want it caught in the air, things could get unsafe.never take a hose off if the boom or anything else could drop.
Later Bob

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Edward

10-08-2002 19:58:54




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 Re: Re: Re: Re: Re: Re: 1975 Ford 4500 Backhoe problem in reply to Bob /Ont., 10-08-2002 16:45:03  
Bob,.. you have been an excellant help !! Now that I think about it,. the hose that I replaced comes right off of the resevior up front on the tractor it is about 2 and 1/2 feet long it connects to what looks like a coupler of some sorts that has another hose on the other side that connects to the controls inside the cab for the hoe. I am hoping that is the restrictor you mentioned, I bet when I put the hose back on I tighted it along with the fitting from the new hose to the restrictor itself ?? I am looking forward to going out there and trying it so that I can get back to work on my digging hopefully tomorrow. Thanx again. I will let you know what I figure out. Thanx.

Edward

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Bob /Ont.

10-09-2002 05:48:34




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 Re: Re: Re: Re: Re: Re: Re: 1975 Ford 4500 Backhoe problem in reply to Edward, 10-08-2002 19:58:54  
Your welcome Ed, I'll need to pass a little of the thanks on to Dick who mentioned the flow control valve. I have never seen them on a backhoe loader, only larger excavators. They are of the design that they could easily be put into any circuit though. In your case just think, variable resistor and diode in parallel. I emailed you a drawing of what they could be like inside.
Later Bob



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