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JD 4010 weak hydraulics

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gwece

06-10-2003 07:08:06




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The hydraulics on my JD 4010 have gotten progressively weaker for the last couple of years. Hitch and any attached remote cylinders are real slooow now...sometimes get chatter from hitch when lifting. Steering and brakes are fine. I have changed the hyd fluid and filter....didn't help. Anyone have any suggestions as to where to look first?




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Heat Houser

06-11-2003 21:33:05




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 Re: JD 4010 weak hydraulics in reply to gwece, 06-10-2003 07:08:06  
Just got through chaseing a slow Hydraulic system on my 4010. I found a bit of metal under the stroke control valve in the main pump holding the pump destroked. Steering would work but nothing else. The screen that G-MAN is talking about is at the bottom left of the transmission just behind the oil filter bypass valve and just in front of the LH axle housing. You will see what looks like a pipe plug with a square head. Get on the head with a wrench and remove the plug. Reach in and pull out the screen.
To test the transmission pump, go to a Hyd shop and purchase a -12 JIC swivel nut to 1/2 inch NPT adaptor fitting. Install a tee on to the adaptor, and into the tee, a 100 PSI gage and a gate valve.
You will use the gate valve to restrict the flow to create 50 psi. Do not close the valve completely as you can blow up the pump. Remove the main pump supply pipe (short section behind the LH battery box)(1 1/4 wrench required) and turn the elbow down and install the gage assembly. At 50 PSI you should get 1 gal every 15 seconds. Use the clutch to start and stop the pump. Good luck

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gwece

06-12-2003 20:55:41




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 Re: Re: JD 4010 weak hydraulics in reply to Heat Houser, 06-11-2003 21:33:05  
I checked the pump screen and it was about 20-25% blocked. Haven't taken it to the field yet, but appears somewhat better but not normal. If this doesn't do it, can I check the crankcase outlet valve & filter and the stroke control valve for foreign material...(I've never messed with the main hydraulic pump before....or is that something I should send tractor to JD shop for???? Or should I check the transmission pump output first??

Thanks for your help!!

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G-MAN

06-10-2003 10:43:45




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 Re: JD 4010 weak hydraulics in reply to gwece, 06-10-2003 07:08:06  
Start with a standby pressure check and pump flow test. More than likely your pump is just getting worn and not producing the flow it used to. Those two simple tests will tell you a lot about the condition of the pump and stroke control valve. Did you check the trans sump screen when you changed the filter and oil? You could also possibly have a transmission pump getting weak, which isn't supplying sufficient charge oil to the main pump. Since the system is still working to some degree, it shouldn't be too hard to diagnose.

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gwece

06-11-2003 13:37:17




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 Re: Re: JD 4010 weak hydraulics in reply to G-MAN, 06-10-2003 10:43:45  
Thanks gman! Haven't checked the pump screen yet. How do I get access to it? I have a JD Service manual which shows an overall view of the hydraulic system including the pump screen, but it doesn't show you how to access it.



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