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Easy things first, replace all the hydraulic filters. Also go to partscatalogdeere.com and type in your model. Check if there are check valves in your steering hydraulics. Could be one is not operating correctly.
Try disconnecting a hose from the steer cylinder. Place the hose end in a 5 gal. bucket and see if you have flow from steer motor. turn steering wheel to the opposite direction of open hose fitting to check for steer cylinder piston leakage. Piston leakage will pressurize both directions of steer cylinder at the same time resulting in no steer. Be careful not to overflow your bucket. Reuse your oil if bucket is clean
ck your hydraulic oil tank level ? if ok ck that your three point hitch moves up/down ? this model uses the tractors hydraulics to steer , testing these things first helps to identify a bad steering valve
Hey, the "round cylinder" is a power steering motor for a John Deere 630. If you start looking for one of those instead, I'll bet you'll have better luck. Deere dealerships tend to not care unless you're buying a half million dollars in equipment.
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