FRONT CORNER (LEFT OR RIGHT) DOES NOT RAISE IN SPRUNG OR UNSPRUNG MODE
In SPRUNG mode, hydraulic pressure is delivered to front actuator through line 9. In UNSPRUNG mode,
hydraulic pressure to raise front corner of vehicle is delivered through line 3.
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.
Use these procedures to troubleshoot either left or right front of vehicle.
1. BUMP STOP CYLINDER
2. NO. 1 ACTUATOR, RIGHT HAND
3. NO. 2 ACTUATOR, RIGHT HAND
4. MAIN HYDRAULIC PUMP
5. RETURN LINE FILTER
6. MAIN ACCUMULATOR
7. HIGH-PRESSURE FILTERS
8. DIRECTIONAL CONTROL
9. SPRUNG/UNSPRUNG VALVE
10. HYDRAULIC RESERVOIR
11. COMPENSATING PUMP
12. MAIN MANIFOLD, RIGHT HAND
13. CHECK VALVE
FRONT SUSPENSION RAISE/LOWER CIRCUIT