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TM 5-2420-222-34
14-20.
BACKHOE BOOM CYLINDER ASSEMBLY REPAIR.
This Task Covers:
a.
Disassembly
c.
Repair
b.
Cleaning and Inspection
d.
Assembly
Initial Setup:
Equipment Conditions:
Materials/Parts:
•
Backhoe boom 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)
Tools/Test Equipment:
•
Dry cleaning solvent (Item 31, Appendix B)
•
General mechanic's tool kit
•
One repair kit
•
Field automotive shop set
General Safety Instructions:
Personnel Required: Two
•
Dry cleaning solvent is flammable and must not be
used near open flame. Use only in a well-ventilated
area.
•
Compressed air used for cleaning purposes should
never exceed 30 psi (207 kPa).
a.
DISASSEMBLY
1.
Place actuating cylinder (3) in vise with caps.
2.
Remove setscrew (4) from actuating cylinder (3).
3.
Remove lubrication fitting (2) from actuating cylinder (3).
4.
Using spanner wrench, loosen valve stem guide (11) from actuating cylinder (3). Slide valve stem guide back onto
piston rod (8).
NOTE
Use a drain pan to catch fluid when draining actuating cylinder. Clean up all spills.
5.
Loosen vise and tilt actuating cylinder (3) to drain hydraulic fluid.
6.
Tighten vise. With the aid of an assistant, remove piston rod (8) with assembled parts from actuating cylinder (3).
7.
Remove actuating cylinder (3) from vise.
8.
Place piston rod (8) in vise with caps. Remove nut (5) from piston rod.
9.
Tap pistons (13 and 17) with assembled parts loose and remove from piston rod (8). Remove piston rod from
vise.
10.
Remove valve stem guide (11) with assembled parts from piston rod (8).
11.
Remove piston ring (6) and wear ring (14) from piston (13). Discard wear ring.
12.
Remove V-packing (15) and preformed packing (16) from piston (17). Discard V-packing and preformed packing.
14-94
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