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TM 5-2420-222-34
14-14.
LOADER CONTROL VALVE ASSEMBLY REPAIR.
This Task Covers:
a.
Disassembly
c.
Repair
b.
Cleaning and Inspection
d.
Assembly
Initial Setup:
Equipment Conditions:
Materials/Parts:
•
Loader control valve assembly removed (see
•
Detergent (Item 13, Appendix B)
TM 5-2420-222-20).
•
Hydraulic fluid (Item 15, Appendix B)
Tools/Test Equipment:
•
Rags (Item 28, Appendix B)
•
General mechanic's tool kit
•
Dry cleaning solvent (Item 31, Appendix B)
•
Five lockwashers
General Safety Instructions:
•
Dry cleaning solvent is flammable and must not be used near open flame. Use only in a well-ventilated area.
a.
DISASSEMBLY
1.
Using machinist's scriber, match-mark loader control valve assembly parts to ensure proper assembly.
2.
Remove five capscrews (1) and lockwashers (2) from two valve caps (3 and 6), boom valve (8), and bucket valve
(7). Discard lockwashers.
3.
Remove valve cap (3), two preformed packings (4), and preformed packing (5) from boom valve (8). Discard
preformed packings.
4.
Remove valve cap (6), two preformed packings (4), and preformed packing (5) from bucket valve (7). Discard
preformed packings.
5.
Remove bucket valve (7), two preformed packings (4), and preformed packing (5) from boom valve (8). Discard
preformed packings.
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.
1.
Clean all metal parts with dry cleaning solvent and rags. Dry thoroughly with clean, dry rags.
2.
Inspect all metal parts for cracks, breaks, and abnormal bends.
3.
Inspect valve caps for damaged threads.
14-72
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