TM 5-2350-378-23&P
0017
REAR OF VEHICLE RAISES IN SPRUNG, BUT NOT UNSPRUNG MODE - Continued
STEP
9.
Perform SPRUNG/UNSPRUNG control valve operation test using HDC.
a.
Reset all HDC solenoid valves by selecting RESET VALVES button (Figure 5, Item 2) on HDC control
box.
b.
Start engine and have assistant move SPRUNG/UNSPRUNG lever between SPRUNG and UNSPRUNG
several times.
c.
Observe transducer T-12 hydraulic pressure on HDC display (Figure 5, Item 1).
1
2
T01507HDC
Figure 5. Hydraulic Diagnostic Center (HDC) Control Box.
d.
Hydraulic pressure should be less than 145 psi (1,000 kPa) in SPRUNG mode and greater than
2,500 psi (17,238 kPa) in UNSPRUNG mode.
e.
Stop engine; relieve hydraulic pressure.
CONDITION/INDICATION
Is valve operating correctly?
DECISION
YES - Verify problem with operator.
NO - Replace SPRUNG/UNSPRUNG control valve (TM 5-2350-262-20).
STEP
10.
Adjust SPRUNG/UNSPRUNG control valve linkage.
