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John Deere Tractors Discussion Forum
Show Parts for Model:

JD 7 Backhoe Attachment

Author 
Jon Casey

08-23-2004 07:15:23
129.42.208.182



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I bought a used JD 7 Backhoe attachment for my JD 650 tractor. Attachment came off a 650 with all mounting hardware. I hooked the backhoe hydraulic "IN" line directly to the tractor pump supply port with a tee fitting(bottom port on pump). I hooked the backhoe hydraulic "OUT" line to the return port in the tractor transmission case. Backhoe has VERY low power. All cylinders move EXCEPT boom cylinder moves down only, will not raise boom. Also, when the backhoe hydraulics are connected, tractor hydraulics are also poor (can not raise loader bucket). When I disconnected the backhoe, all tractor hydraulics work fine.

Does this sound like I hooked the backhoe hydraulics up wrong or does it sound like a blown seal somewhere? Should the "OUT" line hook into the high pressure by-pass return line on the pump instead of the main transmission reservior?

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Mike M

08-23-2004 10:19:33
24.140.40.90



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 Re: JD 7 Backhoe Attachment in reply to Jon Casey, 08-23-2004 07:15:23  
A backhoe on a 650 ? I'm not sure JD recommended that model for a backhoe. Anyhow you should be dealing with three hoses,pressure/in,return/out,and a power beyond. On a unit with a backhoe you want the hoe to get to oil first then the loader then the threepoint hitch. Where you teed in you are probabaly just running the oil through the other valves open center and dumping right back into the resevior. That's why you have to take the fluid from a power beyond port,so it isn't dumped right back into the resevior.

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Jon Casey

08-23-2004 11:58:55
129.42.208.182



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 Re: JD 7 Backhoe Attachment in reply to Mike M, 08-23-2004 10:19:33  
Mike:

Thanks for your comments. 650 did have a backhoe options (I still have the original 650 brochures)and I believe I have the correct attachment with sub-frame etc. I agree, small tractor for a backhoe though. However, I do not plan on using it for anything big.

I do have 3 original hoses on the tractor. One hose goes from the pump to the loader hydraulic value ("IN" port). The second hose is a hose which goes from the loader valve (By-Pass port) back to the top port in the pump. The third hose goes from the loader valve("Out" port)to the transmission reservior. I teed into the "In" port hose directly at the pump for the supply to the backhoe. I am not sure which hose is the power beyond hose. The backhoe return line I hooked into the reservior.

How can I determine which is the power beyond hose?

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Mike M

08-23-2004 12:45:26
24.140.40.90



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 Re: JD 7 Backhoe Attachment in reply to Jon Casey, 08-23-2004 11:58:55  
That hose going from the loader valve by-pass port to what you say is top port in pump should be it. That top port should be under the seat which is a valve block which feeds into the three point hitch.Your backhoe should have a third port also ? You could run from the loader first then to the hoe but you may get more restriction and the hoe will need all the GPM you can get.



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Jon Casey

08-23-2004 13:33:04
129.42.208.182



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 Re: JD 7 Backhoe Attachment in reply to Mike M, 08-23-2004 12:45:26  
Mike:

Thanks. Yes, the value block does have 3 ports. The third port I believe is hard plumbed for the 3-Pt hydraulics. Thanks for all your help. I will try and connect in where your suggested.



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Mike M

08-23-2004 18:54:31
65.238.9.77



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 Re: JD 7 Backhoe Attachment in reply to Jon Casey, 08-23-2004 13:33:04  
All the manuals should still be available from JD the factory service manual has nice diagrams of the hyd. plumbing.



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Jon Casey

08-24-2004 04:58:44
129.42.208.182



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 Re: JD 7 Backhoe Attachment in reply to Mike M, 08-23-2004 18:54:31  
Mike:

Thanks for all your help. I will try and get a copy of a schematic. I sent an e-mail to the previous owner and he had both lines from the backhoe hooked up to the value block under the seat. Nothing going to the reservior.



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Mike M

08-24-2004 06:39:48
24.140.40.90



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 Re: JD 7 Backhoe Attachment in reply to Jon Casey, 08-24-2004 04:58:44  
No return ?? Maybe thats why he sold it,he couldn't get it to work right ??



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Jon Casey

08-24-2004 07:47:21
129.42.208.182



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 Re: JD 7 Backhoe Attachment in reply to Mike M, 08-24-2004 06:39:48  
He bought the tractor used with the backhoe. There must have been a return somewhere because the backhoe has a lot of use (in fact worn out). I replaced most of the pins and sleeves already. I called JD and they had a picture of the connections, just as you described. Thanks for all your help. Will hook it up tonight and see what I get. May have a seal problem but will find out once I hook it up correctly. Values can be rebuilt if required.

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Mike M

08-24-2004 08:10:15
24.140.40.90



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 Re: JD 7 Backhoe Attachment in reply to Jon Casey, 08-24-2004 07:47:21  
I'm glad you called a dealer in general they are willing to help. But more important they may even have a copy of a service manual and you could photo copy some pages out of it.Definitly find out how it was intended to be hooked up as it does look like it was designed for your machine along with the newer models.



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Jon Casey

08-25-2004 08:17:05
129.42.208.182



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 Re: JD 7 Backhoe Attachment in reply to Mike M, 08-24-2004 08:10:15  
Mike;

Hooked the backhoe up last night and everything seems to work fine. Plenty of power. Valves seep oil. Have some new seals on-order which should fix problem. Thanks for all the help.



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kartvines

06-14-2005 14:05:12
209.179.202.116



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 Re: JD 7 Backhoe Attachment in reply to Jon Casey, 08-25-2004 08:17:05  
I installed mine last week end after replacing hoses and seals, how is your connected to the tractor? My tractor is a 770, and the backhoe attachment connects in 3 spots, just above the PTO, and in the slots below the power beyond unit, also I have a locking slot that I am now having problems with because the bar keeps coming dislodged, and I can not think of any way to fix the problem besides welding it in place. How is your held on the tractor? My JD 7 back hoe attachment has only two hoses.

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Mike M

08-26-2004 05:38:56
24.140.40.90



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 Re: JD 7 Backhoe Attachment in reply to Jon Casey, 08-25-2004 08:17:05  
That's great ! Where did the hoses end up hooking to ?



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