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JD 4630 hydraulic issues

A

Anonymous-0

Well-known Member
On our JD 4630 we seem to be having issues where the hydraulics are slow but it seems like there is a leak somewhere internally. When raising the cultivator on the 3 pt hitch at about 1000 engine RPM it lifts slower than normal. WHILE raising the cultivator the engine SEEMS to be under less load from the hydraulic system than when the cultivator is fully raised. Question is, where is the most likely place on these tractors for an internal leak? I would also like to note that the steering seems hard sometimes. After cultivating for a while I took a temp gun to note hydraulic oil temps... transmission oil filter housing was 135 degrees, steering valve above the engine was 155 degrees, main hydraulic pump was 150 degrees... could there be an issue with steering valve? Any input would be greatly appreciated, thanks!
 

How long since hyd filter was changed and sump screen changed?? Has stand-by pressure been checked lately??

Steering valves have a history of internal leakage along with SCV's and rockshaft valves. Steering valve was changed to metering type at SN 010647- which normally gave less internal leakage problems.
 
Last year we changed the hydraulic oil and filters, plus
cleaned out the sump screen. We just changed filters again
yesterday, but that didnt help. Will probably drain oil this
morning to check the screen again. have not checked standby
pressure lately.
 
stick a 5,000 psi gauge in the SCV and see what your stand by pressure is, if it"s below 2250, adjust the stroke valve screw "in" do bring it up to 2250psi (or a bit over),,then see how thing work..
 
Our 4630 had a relief valve on the bottom of the pump that failed several times and you could not see anything wrong with it but when replaced everything worked as it should. It is under the plug that is just left of center on the bottom of the pump. Hope this helps.
 
(quoted from post at 15:01:43 06/12/12) Our 4630 had a relief valve on the bottom of the pump that failed several times and you could not see anything wrong with it but when replaced everything worked as it should. It is under the plug that is just left of center on the bottom of the pump. Hope this helps.
Click to expand...

Actually there is no relief valve in the hyd pump but rather the stroke control valve(parts keys #42,43 & 44) which controls stand-by pressure.
8412.jpg
 
Thanks for the replies. To update of my progress, I checked the inlet screen and found roughly 5 large flakes of metal, not sure where from. The rest was just filings all around a cow magnet that someone stuck in there. Otherwise most of the screen was clean. Standby pressure was right at 2300 psi. Didnt use the tractor much yesterday, but it seemed ok the little bit that I ran it. The problem was always worse when the oil was warmed up. Will let you guys know if the problem continues, thanks for the help!
 
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