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TM 10-3930-673-34
16
16-11. BOOM ASSEMBLY REPLACEMENT
This Task Covers:
a. Removal
b. Installation
INITIAL SETUP
Materials/Parts
Tools and Special Tools
Compound, Anti-seize (Item 10, Appendix B)
Tool Kit, General Mechanic's: Automotive
Tags (Item 55, Appendix B)
(Item 23, Appendix D)
Locknut
Shop Equipment, Automotive Maintenance and
Locknut (2)
Repair; Field Maintenance, Basic, Less Power (Item
Locknut (2)
Cap and Plug Set (Item 1, Appendix D)
Lockwasher (8)
Lifting Device, 3-ton (2721.55 kg) capacity
Wood Blocks
Jackstand
Container, 5 gal (19.1) capacity
Equipment Condition
Personnel Required
Attachment cylinder removed
Two
(TM 10-3930-673-20)
Attachment removed (TM 10-3930-673-20)
Counterweight removed (TM 10-3530-673-20)
Transmission cover removed
(TM 10-3930-673-20)
Boom assembly fully retracted
(TM 10-3930-673-10)
NOTE
In this procedure, the inner, intermediate, and outer boom sections are removed as a unit. For removal
of individual boom sections, refer to paragraphs 16-12, 16-13, and 16-14.
WARNING
Before removal of complete boom assembly, remove the countweight. Failure to remove the
counterweight will result in the machine being rear end heavy and rear tipping may occur.
Hydraulic oil in the system can be under pressures over 3000 psi (20685 kPa) with the engine OFF.
ALWAYS relieve pressure in hydraulic lines before attempting to remove any component in the
hydraulic system. With engine OFF, move control levers through all operating positions several
times to relieve line pressure. Relieve pressure in hydraulic oil tank by loosening filler cap very
slowly. Failure to follow these precautions could result in serious personal injury.
Boom assembly including boom extend cylinder weighs approximately 4100 lb (1859.72 kg).
Attach suitable lifting device prior to removal to prevent possible injury to personnel.

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