TM 5-2350-378-23&P
0009
TROUBLESHOOTING PROCEDURES - BUMP STOPS INOPERATIVE - Continued
STEP
5.
Perform bump stop cylinder leakage check using the HDC.
a.
Stop engine; relieve hydraulic pressure.
b.
Reset all HDC solenoid valves by selecting the RESET VALVES button (Figure 4, Item 5) on HDC control
box.
c.
Move SPRUNG/UNSPRUNG lever to UNSPRUNG.
d.
For left bump stop circuit; using LINE UP or LINE DOWN button (Figure 4, Item 3), select V10 on HDC
display (Figure 4, Item 2).
e.
Close V10 on the HDC display (Figure 4, Item 2), by selecting the CHANGE POSITION button
(Figure4, Item 4) on HDC control box.
f.
For right bump stop circuit; using LINE UP or LINE DOWN button (Figure 4, Item 3), select V9 on HDC
display (Figure 4, Item 2).
g.
Close V9 on HDC display (Figure 4, Item 2), by selecting the CHANGE POSITION button
(Figure 4, Item 4) on HDC control box.
h.
Start engine and move SPRUNG/UNSPRUNG lever to SPRUNG. Note the time it takes for the bump
stops to extend fully.
i.
Stop engine; relieve hydraulic pressure.
j.
Reset all HDC solenoid valves by selecting the RESET VALVES button (Figure 4, Item 5) on HDC control
box.
CONDITION/INDICATION
Does cylinder fully extend in less than two seconds?
DECISION
YES - Replace or repair affected bump stop cylinder (TM 5-2350-262-20).
NO - Go to Step (6).
STEP
6.
Perform bump stop circuit 11 test using HDC.
a.
Reset all HDC solenoid valves by selecting RESET VALVES button (Figure 4, Item 5) on HDC control
box.
b.
Have assistant start engine and move SPRUNG/UNSPRUNG lever to UNSPRUNG.
c.
For left bump stop circuit; Using LINE UP or LINE DOWN button (Figure 4, Item 3), select V10 on HDC
display (Figure 4, Item 2).
d.
Close V10 on HDC display (Figure 4, Item 2), by selecting CHANGE POSITION button
(Figure 4, Item 4) on HDC control box.
e.
Read transducer T10 hydraulic pressure on HDC display (Figure 4, Item 1).
f.
For right bump stop circuit; Using LINE UP or LINE DOWN button (Figure 4, Item 3), select V9 on HDC
display (Figure 4, Item 2).
g.
Close V9 on HDC display (Figure 4, Item 2), by selecting the CHANGE POSITION button
(Figure 4, Item 4) on HDC control box.
0009-6
03/15/2011Rel(1.8)root(tswp)wpno(T00007)
