TROUBLESHOOTING PROCEDURES - REAR OF VEHICLE RAISES IN SPRUNG, BUT NOT UNSPRUNG
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)
Pin, Cotter (WP 0055, Table 1, Item 1) Qty: 1
Construction Equipment Repairer, 91L (Two)
REAR OF VEHICLE RAISES IN SPRUNG, BUT NOT UNSPRUNG 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.
The rear of the vehicle is raised by left and right actuators, interconnected by hydraulic circuit
8. The SPRUNG and UNSPRUNG circuits operate left and right rear actuators through valves
and mechanical controls. Circuit 9 operates SPRUNG mode; circuit 11 operates UNSPRUNG