APRON WILL NOT RAISE
The apron cylinders receive oil flow from main control valve circuits 19 and 20. Relief valves at ports 19 and 20 of
main control valve limit pressure to apron cylinders to 3,500 psi (24,131 kPa).
High pressure is present in the M9 hydraulic system. Do not disconnect any hydraulic
system component unless hydraulic system pressure has been relieved. Ensure each
hydraulic control lever is moved several times through all positions and hydraulic tank
dipstick is slowly loosened to relieve pressure. Failure to comply may result in severe
injury or death to personnel.
1. APRON CYLINDERS
2. RETURN LINE FILTER
3. HIGH-PRESSURE FILTERS
4. DIRECTIONAL CONTROL
5. HYDRAULIC RESERVOIR
6. MAIN HYDRAULIC PUMP
APRON HYDRAULIC CIRCUIT