TM 9-2320-366-34-1 2-1040 TEST OPTIONS REASON FOR QUESTION KNOWN INFO YES Are flow and pressure through control valve OK? Faulty control valve will cause mast to not erect or stow. NO Control Valve Flow Test WARNING Read WARNING on following page. Repair eight bank valve assembly (para 16-59). START POSSIBLE PROBLEMS 1. j3.  M1089 MATERIAL HANDLING CRANE (MHC) MAST DOES NOT ERECT OR STOW INITIAL SETUP   Equipment Conditions     Engine shut down (TM 9-2320-366-10-1).   Personnel Required     (2)   Tools and Special Tools     Tool Kit, Genl Mech (Item 78, Appendix B)     Tester, Hydraulic (Item 73, Appendix B)       Pan, Drain (Item 43, Appendix B)     Goggles, Industrial (Item 28, Appendix B) Faulty control valve. Faulty holding valve. Faulty thermal relief valve. Faulty erection cylinder. Three stage hydraulic      pump OK. Monoblock valve OK. Hydraulic oil level OK. Hydraulic hoses, tubes and fittings OK. Monoblock valve OK. Materials/Parts   Rag, Wiping (Item 60, Appendix C)   Hose (2) (Item 40, Appendix C)   Fitting (2) (Item 31, Appendix C)   Reducer, Tube (Item 61, Appendix C)   Adapter, Swivel (Item 3, Appendix C)   Adapter, Pipe (Item 2, Appendix C)   Fitting (Item 32, Appendix C)   Adapter, Pipe (Item 1, Appendix C)