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TM 5-2420-222-34
14-20.
BACKHOE BOOM CYLINDER ASSEMBLY REPAIR (Con’t).
CAUTION
Do not remove sleeve bushings unless damaged. Removal may damage parts.
17.
Drive sleeve bushing (1 or 9) out of actuating cylinder (3) or piston rod (8).
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 (380C -
59C). 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 all metal parts with rags dampened with dry cleaning solvent. Dry thoroughly with compressed air.
2.
Inspect actuating cylinder for cracks, breaks, chips, and excessive scoring inside actuating cylinder.
3.
Inspect piston rod for cracks, breaks, and excessive scoring.
4.
Inspect sleeve bushings for cracks, breaks, and excessive scoring.
5.
Inspect all metal parts for cracks, breaks, and abnormal bends.
6.
Inspect all threaded parts for damaged threads.
c.
REPAIR
1.
Remove any minor scoring from actuating cylinder (3) or piston rod (8) using 600 grit abrasive cloth.
2.
Restore damaged threads using pipe threading or screw threading set.
d.
ASSEMBLY
NOTE
Perform step 1 only if sleeve bushings were removed.
1.
Drive sleeve bushing (1 or 9) in actuating cylinder (3) or piston rod (8).
2.
Coat new V-packing (7), new wear ring (12), and new wiper seal (10) with hydraulic fluid.
3.
Install V-packing (7), wear ring (12), and wiper seal (10) in place on valve stem guide (11).
4.
Using retaining ring pliers, install retaining ring (20) in valve stem guide (11).
5.
Install valve stem guide (11) with assembled parts in place on piston rod (8).
14-96
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