John Deer 4630/ serial # 005867R

Eric McCain · Sep 15, 2013

having problems with the steering valve, it stops steering no matter how many rpms its at. I can clutch it an it will free up , but not for long, it start making a sound like a jack hammer in the cab, an I have no function from my remotes if I'm pulling a disk or baling hay. have had it rebuilt twice from a company.

MSM · Sep 15, 2013

2 possibilities come to mind...you may have a bad internal hydraulic leak, bleeding off all the available oil to the hydraulic system, or the hex shaft from the crankshaft to the charge pump has stripped, not allowing the charge pump to turn. When you "clutch"it it may move the hex shaft enough for it to get a temporary bite and start turning the charge pump again.This would give you the hammering sound you are hearing as the front pump starts making pressure again.
To check the hex shaft, remove the top link bracket,remove the plug behind it and the hex shaft should be able to be pulled out for inspection. If it has stripped it will be very noticeable,(rounded off instead of hex shaped either at the crankshaft end or about 12 inches in from the end you removed it from where it drives the charge pump. Had the same thing happen on a 4430.

Tx Jim · Sep 15, 2013

(quoted from post at 16:52:34 09/15/13) , an I have no function from my remotes if I'm pulling a disk or baling hay. have had it rebuilt twice from a company.

More than likely whomever rebuilt the steering valve did it incorrectly. Screws(parts keys #1 & #4) can be tricky to set. How long since hyd filer was changed,sump screen checked/cleaned & stand-by pressure monitored? I doubt the trans pump drive shaft is affected by depressing the clutch pedal.

John Deer 4630/ serial # 005867R

Eric McCain

New User

MSM

Well-known Member

Tx Jim

Well-known Member

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