Bulldozer Main Control Valve Assembly D41E-6 D41P-6 D41PF-6 D41E-6T – Part Number 723-23-10300 723-23-10301 Common Faults & Troubleshooting Specific action weak/not working: Stuck spool in that section, spool/sleeve wear causing internal leakage, damaged O-rings. First measure the outlet pressure of that section to diagnose. All actions weak: Usually caused by insufficient main pump pressure or failed main Relief Valve pressure setting. Check system pressure first before