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 TM 5-2420-224-34
BACKHOE CONTROL VALVE, BOOM SECTION VALVE REPAIR (CONT)
2 1 . REMOVE and DISCARD SEAL (47) and
PACKING (48).
2 2 . COMPRESS SPRING (49) and REMOVE
retaining RING (50).
23. SLOWLY RELEASE SPRING (49) and
REMOVE retainer (51), SPRING (49), and
retainer (52) from spool (39).
1.
Check secondary relief valve spring length.
Free length is 1.78 in. (45.3 mm); compressed
length is 1.51 in. (38.4 mm) at 137 16 lb
(627.25 kg).
2.
Check spool spring length. Free length is 2.27
in. (57.6 mm); compressed length is 0.87 in.
(22 mm) at 35 2.1 lb (15.9 1 kg).
I f either spring does not meet length
3.
requirements above, replace spring.
NOTE
A p p l y coat of lubricating oil to
packings and seal prior to
assembly.
I N S T A L L retainer (1), SPRING (2), and
1.
retainer (3) on spool (4).
C O M P R E S S SPRING (2) and INSTALL
2.
retaining RING (5).
20-64
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