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TM 5-2420-222-34
14-19.
BACKHOE CROWD CYLINDER ASSEMBLY REPAIR (Con’t).
9.
Remove actuating cylinder (29) from vise.
10.
Place piston rod (19) in vise with caps. Remove nut (16) from piston rod.
11.
Tap pistons (15 and 11) with assembled parts loose and remove from piston rod (19). Remove piston rod from
vise.
12.
Remove valve stem guide (21) with assembled parts from piston rod (19).
13.
Remove wear ring (14) and V-packing (13) from piston (15). Discard wear ring and V-packing.
14.
Remove preformed packing (12), piston ring (10), preformed packing (26), and packing retainer (25) from piston
(11). Discard preformed packings.
15.
Using retaining ring pliers, remove retaining ring (24) from valve stem guide (21).
16.
Remove V-packing (23), wear ring (22), and wiper seal (20) from valve stem guide (21). Discard V-packing and
wear ring.
17.
Remove lubrication fitting (17) from piston rod (19).
CAUTION
Do not remove sleeve bushings unless damaged. Removal may damage parts.
18.
Drive sleeve bushing (18 or 28) out of piston rod (19) or actuating cylinder (29).
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 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 (29) or piston rod (19) using 600 grit abrasive cloth.
2.
Restore damaged threads using pipe threading or screw threading set.
14-90
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