TM 5-5420-209-12
4-34. Boom Assembly.
This task covers: Replace
INITIAL SETUP
Tools
Personnel Required
General Mechanic’s Automotive Tool Kit
Minimum of two
(Item I, Appendix B)
Lifting device, web straps/chain
Materials/Parts
Grease, Automotive and Artillery
Grease, Graphite (Item 3, Appendix E)
Walkways removed (para. 4-26).
Compound, Deck, Non-Slip (Item 1, Appendix E)
Equipment Conditions
(Item 2, Appendix E)
Winch and cable removed (para. 4-27).
a. Replace. (figure 4-38)
WARNING
When disconnecting any hydraulic line, open line slowly and protect your face. Hydraulic oil can spray
out due to residual pressure in the system.
CAUTION
Tag and disconnect hydraulic lines from boom assembly (1).
Tag and disconnect electrical leads from boom assembly (1).
Block boom cylinders (2) in position.
Remove retaining ring (3), clevis pin (4), securing cylinders (5) to boom assembly (1).
Secure suitable lifting device to boom (1).
Remove eight nuts (6), lockwashers (8), and two caps (9).
Remove boom assembly (1).
Remove eight screws (6), lockwashers (7), nuts (8), and two caps (9) and remove boom
assembly (1).
Cap all hydraulic connections to prevent contamination from entering the hydraulic system.
NOTE
When removing hoses, have a suitable container to drain oil from hoses. Also cap all hoses and ports
immediately to prevent dirt or foreign matter from entering the system.
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
4-142
