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TM 5-2420-222-34
14-18.
JAW CYLINDER ASSEMBLY REPAIR (Con’t).
CAUTION
Do not remove sleeve bushings unless damaged. Removal may damage parts.
13.
Drive two sleeve bushings (10) out of piston rod (11).
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 all metal parts with rags dampened with dry cleaning solvent. Dry thoroughly with compressed air.
2.
Inspect hydraulic cylinder block for cracks, breaks, chips, and excessive scoring inside hydraulic cylinder block.
3.
Inspect piston rod for cracks, breaks, and excessive scoring.
4.
Inspect all threaded parts for damaged threads.
c.
REPAIR
1.
Remove any minor scoring from hydraulic cylinder block (4) or piston rod (11) 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 two sleeve bushings (10) into piston rod (11).
2.
Coat new preformed packings (12, 15, and 17), packing retainer (16), and sleeve bearing (14) with hydraulic fluid.
3.
Install preformed packings (12, 15, and 17), packing retainer (16), and sleeve bearing (14) in place on retainer
(13).
4.
Install retainer (13) with assembled parts in place on piston rod (11).
5.
Coat two new preformed packings (7) and packing retainer (8) with hydraulic fluid.
6.
Install two preformed packings (7) and packing retainer (8) in place on piston (9).
14-86
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