TROUBLESHOOTING PROCEDURES - APRON WILL NOT RAISE
Tools and Special Tools
Tool Kit, General Mechanic's: Automotive
Parts Kit, Hydraulic (WP 0054, Table 1, Item 3)
Vehicle MASTER power OFF (TM 5-2350-262-10)
Vehicle on jack stands (TM 5-2350-262-20)
Construction Equipment Repairer, 91L (Two)
APRON WILL NOT RAISE
High oil pressure is present in the M9 ACE hydraulic system. Do not disconnect any hydraulic
system component unless hydraulic system pressure has been relieved. After hydraulic
system has been relieved, wait at least four minutes before disconnecting any hose or fitting.
Ensure each of the hydraulic control levers is moved several times through all positions and
the hydraulic tank dipstick is slowly loosened to relieve pressure. Failure to comply may result
in severe injury or death to personnel.
The apron cylinders receive oil flow from main control valve circuits 19 and 20. Relief valves
at port 19 and 20 of main control valve limit pressure to apron cylinders to 3,500 psi