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North Carolina | I have a question on how to diagnose what I think may be a internal hydraulic leak on my JD4840 with 8 speed powershift. My lift will fall and shake coming back up. Typically happens at lower rpm (below 1100-1200) or when using a scv. Seems to get worse after using when hydraulic fluid warms up. Transmission seems normal to me othe than wanting to creep when clutch is depressed. Brakes seem a little grabbier than normal but could just be me looking for a problem. Hydraulic fluid, filters, and sump screen replacement was the first step I took with no change. I checked pressure at the scv's and all are 2500psi. Also tried to monitor temperature of hydraulic components from a cold start compared to sump. The clutch regulating valve(driver side of transmission) and draft sensing cylinder both were 30-40 degrees hotter than the sump after 20-30 minutes at idle. ! scv was the same temp and the other 2 were about 5-10 degrees higher than the sump. Are these temp differences showing a leak internally or is it normal? What should my next step be? Any help would be greatly appreciated. New to AgTalk so hopefully I posted this correctly. Thanks | |
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JD4840 how to diagnose hydraulic issue
