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John deere 510 hydraulics slow

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matt

04-30-2002 10:56:48




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I have a john deere 510 backhoe and the hydraulics seem entirely too slow. The backhoe has plenty of power but is very slow. the front loader bucket is the worst. it is so slow but will lift anything. I have changed the fluid and filters and still no faster. is there a filter in the pump itself? any suggestions?




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Tim

04-30-2002 17:47:50




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 Re: john deere 510 hydraulics slow in reply to matt , 04-30-2002 10:56:48  
When you changed the filters, the filter that is to the right of the transmission has a plug just in front and if you removed that plug you may have lost the relisf valve is in behind the plug. another reason for slow hyd can be that the trans supply pump is weak and not supplying enough oil to the big pump up front. yes you do need a pressure gauge to check the pumps.



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Jonathan

04-30-2002 14:11:36




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 Re: john deere 510 hydraulics slow in reply to matt , 04-30-2002 10:56:48  
...was there any "crud" in the drained oil ?? i.e. metal flakes, gray iron.. etc??? ...Did you remove the suction screen when you drained the oil ?? . It may be plugged with years of packings and who knows what. Also is it a double front pump or do you have a front and a mid mount pump ? If the mid mount type , I believe there is a lever that disables the mid pump. It may be in the off position. Some pumps have a filter screen in the stroke control valve on the front pump. Do you have access to a pressure gauge that can read 2500 psi ???

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matt

05-02-2002 08:38:29




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 Re: Re: john deere 510 hydraulics slow in reply to Jonathan, 04-30-2002 14:11:36  
Yes, when i changed the oil there was alot of crud in the suction screen, some much that we replaced the screen. It is a 510 with a front and a mid pump. the lever that i think you are talking about is used for when starting the machine in the extreme cold to put less of a load on the engine. That lever is not disengaged. I have access to a pressure gauage. If the pumps have to be rebuilt, is that a relatively expense rebuild? Also, we have about 100 hours on the machine since changing the oil, i am going to do it again and see how much debris has gathered again. Would that filter in the front pump cause the slow movement. The front bucket is the worst. the hoe moves slow, but for as big and heavey as it is, i thought that was the way it was designed.

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Jonathan

05-02-2002 17:22:00




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 Re: Re: Re: john deere 510 hydraulics slow in reply to matt, 05-02-2002 08:38:29  
The clutch disconnect is on the right of the console I believe...the pump disengage was on the left ...if I remember correctly...been awhile since Ive worked on one of those Titanics !! check the standby pressure...should be around 2300 psi plus or minus a few...What type of debris was in the screen ?? maybe its worth a look to see if there is more...There is a priority valve in backhoes that wont let the loader work below a certain pressure ...gives the oil to the steering first...the backhoe circuit is supplied direct from the pump as you don't usually run the hoe and steer at the same time...unless you are really good !! ... so if the pump pressure is low , it will make the loader doggy...

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John

05-02-2002 16:00:23




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 Re: Re: Re: john deere 510 hydraulics slow in reply to matt, 05-02-2002 08:38:29  
The operators manual says the time to raise the loader is 4.4 seconds, to dump the loader is 1.0 seconds, and lower the loader [power down] is 3.0 seconds, hope this helps. Got this info from a 510C TLB manual.

John



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Aaron

05-02-2002 09:55:15




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 Re: Re: Re: john deere 510 hydraulics slow in reply to matt, 05-02-2002 08:38:29  
Is this something new or has it always been this way? I ran a 510 for years that had the same problem. It had the mid mount pump also. The front bucket was the worst, and I have to believe it has a flow restrictor in the line. The front bucket was slow when the mid-mount pump was not engaged, but if the mid mount pump was engaged, the bucket didn't move any faster, the engine just worked harder. That is why I think there is a flow restrictor in the system somewhere. I just learned to live with it. We engaged the mid-mount pump for backhoe work, when we really needed the extra capacity, and dis-engaged it for loader work so the engine didn't have to work so hard when working the bucket. Please let me know if you find a solution!

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possum

05-02-2002 17:51:38




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 Re: Re: Re: Re: john deere 510 hydraulics slow in reply to Aaron, 05-02-2002 09:55:15  
Your pump and relief valves are probably ok if it has power. What you have is a flow problem, either in the suction or pressure side. Could be the lining in an inlet line collapsed if it has a rubber section. Was there black crud?



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