I have a Lull 644E-42 that has no hydraulics. Transmission works and will move but brakes doesn’t have much pressure to release. I have 190psi on stand by pressure. This is the only pressure that I have in the system. The stand by pressure calls for 200 + 25 , this is not adjustable. I replaced the valve on main valve and still get same reading. The pump/s are pumping perfect specs GPM. I have replaced pump and unloader valve on accumulator and cartridge on main valve. Low brake pressure light is on. I know this system is complex as I have the maunuals but just curious if anyone else has had this issue. I’m thinking the accumulators might be the issue but have no way to test at this time. Any suggestions would be helpful.
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