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Illustration - TM-5-5420-279-230906
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TM-5-5420-279-23 Dry Support Bridge (DSB) (NSN
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CRANE - EXTENSION CYLINDER ASSEMBLY
TM 5-5420-279-23
a.
Remove
(1)
De-pressurize the hydraulic system. See unit maintenance procedure 5-118.
(2)
Remove the two hydraulic hoses (6) attached to the extension cylinder assembly load
holding valve (5).
(3)
Locate and remove the cover (1) from the extension cylinder assembly load holding valve
(5).
(4)
Retain the seal (2).
(5)
Using a 2.5 mm allen key locate and turn the locking set screw (3) counter clockwise one
full turn.
(6)
Place a clean cloth over the extension cylinder assembly load holding valve (5) to catch
any split fluid and to protect the maintainer.
(7)
Using a 4 mm allen key locate and slowly turn the spool valve adjuster (4) counter
clockwise until the hydraulic pressure in the extension cylinders is released. Note the
number of turns it takes to release the pressure.
(8)
Check the condition of the sealing ring (2).
(9)
Check the condition of the cover (1).
(10)
Replace components as required.
b.
Install
(1)
Using a 4 mm allen key locate and turn the spool valve adjuster (4) clockwise the number
of turns noted during removal.
(2)
Using a 2.5 mm allen key locate and turn the locking grub screw (3) clockwise to lock the
spool valve adjuster (4) in position.
(3)
Fit the seal (2) to the cover (1).
(4)
Fit the cover (1) to the extension cylinder assembly (5).
6-163

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