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TM 5-2420-222-34
14-21.
BACKHOE BUCKET CYLINDER ASSEMBLY REPAIR.
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-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 (10) or piston rod (20) 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 bushings (11 or 18) in actuating cylinder (10) or piston rod (20).
2.
Coat new V-packing (26), new preformed packing (25), new preformed packing or new packing retainer (24), new
wear ring (23), and new wiper seal (21) with hydraulic fluid.
3.
Install V-packing (26), preformed packing (25), preformed packing or packing retainer (24), wear ring (23), and
wiper seal (21) in place on linear actuating cap (22).
4.
Using retaining ring pliers, install retaining ring (27) in linear actuating cap (22).
5.
Install linear actuating cap (22) with assembled parts in place on piston rod (20).
6.
Coat new preformed packing (16), packing assembly (15), new piston ring (14), and new piston ring (13) with
hydraulic fluid.
14-102
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