Case 721 CXT Loading Shovel
A customer reported a fault wth their Case 721 CXT loading shovel and asked our engineer to visit the site to inspect the hydraulics on the machine.
The pressures to the joystick, from the joystick to the main spool valve, and in the main spool valve were fine. The flow from the joystick to the spool valve appeared poor at first, but improved with time. The spool valve end cap for the lift section was removed and the spool checked for operation. Next the loader arm isolator switch and solenoid coil were both checked and found to be OK. The main spool valve pressure relief valve was removed and dismantled, upon which the seal and internal parts were found to be broken. A replacement pressure relief valve was fitted and set at 190 BAR. The hydraulic tank was re-filled with hydraulic oil and the levels checked. Finally, the machinery covers were replaced and the machine checked for operation. Satisfied that everything was in order, our engineer left the site.
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