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John Deere Tractors Discussion Forum
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4430 hydraulics

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Ryan in IL

05-31-2005 20:49:23




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I have a 4430 (76 model) with very slow hydraulics. It takes forever to raise a tool out of the ground. When the tractor is warmed up, it will go through these spells where I lose everything - hydraulics, power steering, brakes. If I stop and let it idle, it will come out of it. It has fluid, I've changed the filter, cleaned the screen. Turning up the pump on the back doesn't help so I put it back where it was. This is the only Deere I own, so I'm stumped. Maybe a valve sticking? I'd appreciate any tips before I visit the Deere shop. Thanks.

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msb

06-01-2005 20:31:06




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 Re: 4430 hydraulics in reply to Ryan in IL, 05-31-2005 20:49:23  
I would pull the stroke control valve in the hydraulic pump and inspect it before I did anything else since you have changed the fiter and cleaned the suction screen..



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Ryan

06-01-2005 08:45:33




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 Re: 4430 hydraulics in reply to Ryan in IL, 05-31-2005 20:49:23  
We are working on one right now and discovered the hex shaft that drives the hydraulic pump was nearly wore off and the pump gears were badly worn so we have replaced both. This is likely place to look as both hydraulic pumps are needed. Do you have the big oil line return that goes in the trans housing on the lower left side? Ours had this which is supposed to be for synchro only but ours is a quad shift. Could be your main pump is fine but the internal pump could be malfunctioning.

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Tim A.

06-01-2005 20:09:06




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 Re: 4430 hydraulics in reply to Ryan, 06-01-2005 08:45:33  
Sorry to but in, but my 4430 w/quad range trans has this "product improvement" with the large hose coming from the screen plug to the main pump. Should I remove it and convert it back to original...could this cause a problem...or is it ok to leave it as it is.

Thanks,
Tim



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G/MAN

06-01-2005 07:29:02




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 Re: 4430 hydraulics in reply to Ryan in IL, 05-31-2005 20:49:23  
By "turned up the pump on the back", are you referring to the screw back on the rockshaft cylinder cover? If so, all that screw does is change the hitch's rate of drop. It won't affect the pump flow or pressure in the slightest, or the operation of the remotes. Is the main pump chattering when raising slowly? If it only occasionally loses everything, the problem could be in the stroke-control valve, although they usually stick solid and don't come and go. As Thurlow said, proper diagnosis is in order to avoid throwing a bunch of parts and money at the thing for no return.

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thurlow

06-01-2005 05:59:26




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 Re: 4430 hydraulics in reply to Ryan in IL, 05-31-2005 20:49:23  
I usually start with a pressure check; a fluid-filled gauge (3000 psi), a short length of hydraulic hose and a John Deere connector and you can begin the diagnosis..... .....



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charlesmm

05-31-2005 23:31:52




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 Re: 4430 hydraulics in reply to Ryan in IL, 05-31-2005 20:49:23  
try different positions on the draft control , on side wall above your right ankle. make sure the stroke control valve is fully out ,on top of pump if fitted. perhaps the priority valve is sticking, after that you prob. need to get the jd shop to check pressure and flow .



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Bob

05-31-2005 21:44:01




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 Re: 4430 hydraulics in reply to Ryan in IL, 05-31-2005 20:49:23  
Turned up the pump at the BACK??? To what are you referring... did you set up the Perma-Clutch pressure??? (Or is this a power shift?)

You need to be sure the rear pump is putting out enough flow (and there are no leaks in the clutch or PTO system) so the clutch operating pressure is correct, and there is a good flow left over, going up fron to the oil cooler and then to the main pump.

If the main pump is getting a good supply of oil to it, then it sounds like an internal problem in the front pump.

Another thing to check is does the pressure line FROM the front pump down the RH side of the tractor towards the rear heat up quickly upon startup from cold, because of a high pressure leak-to-sump?

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cuscut7720

06-01-2005 19:28:35




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 Re: 4430 hydraulics in reply to Bob, 05-31-2005 21:44:01  
You may want to check the suction screen.It is located on the lower left side of the transmission case near the drawbar support.Should be a plug that will accept a 1/2" breaker bar.If you are quick you can pull the plug and screen then stick the plug back in.prepare to get at least some oil on you!If the screen is covered with slime and small bits of brass you may be looking at a brake job in the very near future.Hope this helps.

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