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TM 5-2420-222-34
14-19.
BACKHOE CROWD CYLINDER ASSEMBLY REPAIR.
This Task Covers:
a.
Disassembly
c.
Repair
b.
Cleaning and Inspection
d.
Assembly
Initial Setup:
Equipment Conditions:
Materials/Parts:
•
Backhoe crowd cylinder assembly removed (see
•
Abrasive cloth (Item 6, Appendix B)
TM 5-2420-222-20).
•
Hydraulic fluid (Item 15, Appendix B)
•
Rags (Item 28, Appendix B)
•
Dry cleaning solvent (Item 31, Appendix B)
Tools/Test Equipment:
•
General mechanic's tool kit
•
Two preformed packings (serial numbers
319995-342573)
•
Field automotive shop set
•
Two self-locking nuts (serial numbers 235786-
General Safety Instructions:
235999)
•
Dry cleaning solvent is flammable and must not be
•
Two V-packings
used near open flame. Use only in a well-ventilated
•
Two wear rings
area.
•
Eight preformed packings (serial numbers
235786-235999)
•
Compressed air used for cleaning purposes should
never exceed 30 psi (207 kPa).
Personnel Required: Two
a.
DISASSEMBLY
NOTE
Steps 1 through 3 apply only to loader backhoes with serial numbers 235786-
235999.
1.
Remove two self-locking nuts (6), ferrules (5), preformed packings (3), and packing retainers (4) from adapters
(2). Discard self-locking nuts and preformed packings.
2.
Remove two adapters (2) and preformed packings (1) from actuating cylinder (29). Discard preformed packings.
3.
Remove two tubes and fittings (7) and preformed packings (8) from actuating cylinder (29). Discard preformed
packings.
4.
Place actuating cylinder (29) in vise with caps.
5.
Remove lubrication fitting (27) and setscrew (9) from actuating cylinder (29).
6.
Using spanner wrench, loosen valve stem guide (21) from actuating cylinder (29). Slide valve stem guide back
onto piston rod (19).
NOTE
Use a drain pan to catch fluid when draining actuating cylinder. Clean up all spills.
7.
Loosen vise and tilt actuating cylinder (29) to drain hydraulic fluid.
8.
Tighten vise. With the aid of an assistant, remove piston rod (19) with assembled parts from actuating cylinder
(29).
14-88
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