TM 55-1520-240-23-6
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BLEED CARGO RAMP AND DOOR HYDRAULIC SYSTEM (WITHOUT EXTERNAL
POWER)
(Continued)
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14.
Set ramp control handle (13) to DN. The ramp
shall lower fully.
15.
Turn lockpin handle (3) on sequence valve (2) to
release manual override knob (1).
16.
Set handle (13) to UP. The ramp shall rise and
pause; the door shall extend fully; then the ramp
shall fully raise.
17.
Repeat steps 14 and 16 until no more air comes
through hose (10) at transfer cylinder (9).
18.
Lower the ramp. Close bleed valve (8) on transfer
cylinder (9) and raise the ramp.
19.
Check extensIon of piston rod (12). Extension
shall be about 4.2 inches. If less than 4.0
inches, repeat bleed procedure.
20.
Lower the ramp. Check that piston rod (12)
retracts.
21.
Remove bleed hose (10) from valve (8). Install
cap (7).
22.
Shut down the APU.
FOLLOW-ON MAINTENANCE:
Close cargo ramp (TM 55-1520-240-T).
Disconnect battery (Task 1-39).
Set ramp switch to OFF.
END OF TASK
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