TM 9-2330-381-14
4-19. HYDRAULIC SYSTEM BLEEDING (CONT)
SUSPENSION CIRCUIT BLEEDING
1.
Start APU (para. 2-16).
CAUTION
When lowering platform, do not allow suspension cylinders to be completely
compressed or bottomed out. Allow a minimum of 1 inch (2.5 cm) of cylinder
plunger/piston rod to remain exposed or damage to equipment may result.
2.
Operate all three suspension controls (para. 2-19) and lower suspension to approximately 1 inch (2.5 cm) from
being fully lowered. Deck height should be approximately 34 inches (86 cm).
3.
Raise platform (para. 2-19) to approximately 52 inches (132 cm). This is approximately 1 inch (2.5 cm) less than its
maximum height.
4.
Repeat steps 2 and 3 until platform operates smoothly (approximately 30 cycles).
NOTE
If tactical situations permit, allow semitrailer to sit undisturbed for 8 hours or
overnight as outlined in step 5. If not, skip step 5 and continue with step 7.
5.
If semitrailer is allowed to sit undisturbed for 8 hours, continue as follows:
a. Evenly raise platform to a height of 52 inches (132 cm).
b. Shut down APU (para. 2-16).
c. Allow trailer to sit for 8 hours or overnight.
d. If semitrailer has not settled, proceed to step 6. If semitrailer has settled, proceed to step e.
e. Start APU (para. 2-16).
f. Repeat steps 2 and 3 approximately 15 cycles.
g. Repeat step 5.
6.
Lower platform to normal road height (para. 2-19) and shut down APU (para. 2-16).
7.
Perform gooseneck circuit bleeding.
8.
Check hydraulic tank fluid level (para. 4-17) and refill if necessary.
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