FRONT CORNER (LEFT OR RIGHT) RAISES IN UNSPRUNG, BUT NOT SPRUNG MODE
SPRUNG mode provides for a smooth ride up to 30 mph (48 km/h) and is used for over the road marches and
parking of the vehicle. Hydraulic pressure is supplied to front actuators through line 9.
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