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TM 5-2420-222-34
14-15.
LOADER BOOM AND BUCKET VALVES REPAIR (Con’t).
b.
CLEANING AND INSPECTION
WARNING
• Dry cleaning solvent, P-D-680, is toxic and flammable. Always wear protective
goggles and gloves, and use only in a well-ventilated area. Avoid contact with
skin, eyes, and clothes, and DO NOT breathe vapors. DO NOT use near open
flame or excessive heat. The solvent's flash point is 100°F-138°F (38°C-59°C). If
you become dizzy while using cleaning solvent, immediately get fresh air and
medical help. If solvent contacts eyes, immediately wash your eyes and get
medical aid.
• Compressed air used for cleaning or drying purposes, or for clearing restrictions,
should never exceed 30 psi (207 kPa). Wear protective clothing (goggles/shield,
gloves, etc.) and use caution to avoid injury to personnel.
1.
Clean valve body with rags dampened with dry cleaning solvent. Dry thoroughly with compressed air.
2.
Clean fluid flow restrictor and valve with dry cleaning solvent and rags. Dry thoroughly with compressed air.
Ensure that holes are free of material and dirt.
3.
Clean all other metal parts with dry cleaning solvent. Dry thoroughly with compressed air.
4.
Clean bellows with rags dampened with water and detergent solution. Rinse with clean water. Dry thoroughly
5.
Inspect spring (16) for cracks, breaks, and abnormal bends. Using portable spring resiliency tester and
machinist’s rule, apply 8 oz (2.2 N) of force and measure compressed length of spring. Compressed length must
be 0.8125 in. (20.6375 mm).
6.
Inspect spring (25) for cracks, breaks, and abnormal bends. Using spring tester and torque wrench, apply 27 lb
(120 N) of force and measure compressed length of spring. Compressed length must be 1.1875 in.
7.
Inspect spring (8) for cracks, breaks, and abnormal bends. Using spring tester and torque wrench, apply 75 lb
(334 N) of force and measure compressed length of spring. Compressed length must be 0.625 in. (15.875 mm).
NOTE
Valve body and valve are a matched set. If either part is damaged, both must be
replaced.
8.
Inspect valve for burrs and rough spots.
9.
Inspect all other metal parts for cracks, breaks, and abnormal bends. Inspect threaded parts for damaged
threads.
c.
REPAIR
1.
Remove rough spots or burrs from valve (12) using 600 grit abrasive cloth.
2.
Restore damaged threads using pipe threading or screw threading set.
d.
ASSEMBLY
NOTE
Perform steps 1 through 3 only if repairing boom valve.
1.
Install ball bearing (29) and spring pin (27) in plug valve (26).
2.
Install plug valve (26), new backup washer (30), and two new preformed packings (28 and 31) in valve body (32).
14-77
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