I have an early 450A (Ford dual fuel) with several functions not working. It will not swing, the basket level or pivot and the extension in and out do not respond when selected. The unit will drive, steer and it will go up as well as back down. The non working functions will work if I select a working function in concert with a non working function. I changed the dump cartridge and swapped with a coil that works another function properly even though I could see movement in the shuttle with the valve removed. I checked the power and ground. I did the same thing with the proportional flow control coil and put in a new cartridge. I switched the coil with the lift valve and then I switched around the sequence valves (Bang bang and Proportional) as hey had the same part number. These changes did not help my situation. When I energize pin 14 I get 3K psi at G2. The manual tells me this should be 230 – 325psi. It has me pulling out my last two hairs. Any ideas about what I have failed to check?
Donold, Today at 2:33 PM
Donold, Today at 2:33 PM