FRONT CORNER (LEFT OR RIGHT) RAISES IN UNSPRUNG, BUT NOT SPRUNG MODE
· 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.
· Transmission shifting lines are pressurized. Do not disconnect lines, fittings, or
accumulator unless transmission shift control valve pressure has been relieved.
Discharge transmission shift accumulator by moving shift control lever through all forward
and reverse ranges several times, with engine off. Failure to comply may result in severe
injury to personnel.
· 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 vehicle. Hydraulic pressure is supplied to front actuators
through line 9.
· Use these procedures to troubleshoot either left or right front of vehicle.
Perform V19 test.
Reset all Hydraulic Diagnostic Center (HDC) solenoid valves by selecting RESET VALVES button
(Figure 1, Item 5) on HDC control box.
Using LINE UP or LINE DOWN button (Figure 1, Item 3) on HDC control box.
Select V5 on HDC display (Figure 1, Item 2), and using CHANGE POSITION button (Figure 1, Item 4),
close V5 on HDC display (Figure 1, Item 2).
Move SPRUNG/UNSPRUNG lever to UNSPRUNG.
Read transducer T-1 hydraulic pressure on HDC display (Figure 1, Item 1).
Using LINE UP or LINE DOWN button (Figure 1, Item 3) on HDC control box, select V5 on HDC display
(Figure 1, Item 2).
Using CHANGE POSITION button (Figure 1, Item 4), open V5 on HDC display (Figure 1, Item 3).