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| Our 1970's JD 4320 blows the rubber return hose on top of the hydraulic pump if we run the engine too fast when the oil is very cold (less than 30*). We replaced the oil cooler bypass check valve but it didn't seem to help. The dealer wants us to remove the ball in the check valve but it doesn't seem to me like that would fix the problem. All the hydraulic functions seem to work fine. For whatever reason, there seems to be too much pressure. Any solutions? | |
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JD 4320 blows return hose at hydraulic pump
