Posted by rweller@eeft.com on July 02, 2022 at 08:59:21 from (165.225.58.102):
i have a 4230 JD that's having two hydraulic problems. 1st problem is the low pressure line from the power steering metering pump (mounted at the bottom of the steering shaft) and the steering valve (mounted on the engine side of the firewall just above the motor) is blowing due to high pressure after the tractor has ran about 2 hours with a disc mower or baler - doesn't happen if ran at lower rpms. I read from someone's post that the check valves in the steering valve could be worn and causing the high pressure to push to the low presure side so we replaced the steering valve - unfortuntately, that didnt solve the problem. A deere mechanic suggested that the check valve in the metering pump may be worn and when the hydraulic oil gets hot, it passes thru the check valve easier - leading to the bleading of the high pressure side to the low pressure side. PS- the metering pump on this 4230 has niples on the low pressure fittings rather than the JIC fittings that they put on later models.
2nd problem is pressure release on single action cylinders. I have a high-capicity rake which has single action cylinders to raise and lower the raking wheels. The hydraulics work fine to raise the wheel frame, but when i go want to lower the wheels to rake by releasing the presure on the cylinder, the hydraulics do not bleed back to the hydraulic system.
if anyone out there knows what the problem is, i woudl greatly appreciate it. Thanks for the help.
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