BOOM ASSEMBLY REPLACEMENT - continued

TM 10-3930-673-34

16-11. BOOM ASSEMBLY REPLACEMENT (CONT)

CAUTION

Release hydraulic joystick immediately after boom hoist cylinder to be removed has fully retracted. If

joystick is allowed to remain open, the other cylinder will start to retract, putting extreme stress on

lifting equipment and boom assembly.

(12) Start engine and run at idle. Fully retract

boom hoist cylinder to be removed (20) using

joystick. Boom hoist cylinder will retract

very slowly. Stop engine.

(13) Carefully lower boom hoist cylinder (21)

onto board placed across vehicle deck so

hydraulic line on cylinder is not damaged.

(14) Repeat Steps (10) through (13) for other

boom hoist cylinder (21).

(15) Place jackstand or support on front of

vehicle deck. Adjust support so that boom

assembly (6) will be level when lowered.

(16) Carefully lower boom assembly (6) with hoist

and sling until front of outer boom section is

on jackstand or other suitable support.

TR01367

NOTE

Center of gravity for boom assembly is

approximately 9 ft from rear end of

boom assembly.

Install a bolt and nut to top-front of outer

boom. Install one hook to bolt and other two

hooks to top-rear of outer boom.

(17)

Position hoist and slings to boom assembly

(6). Carefully raise boom assembly until

weight of boom is removed from boom pivot

pins (24).

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(18)

Remove locknut (25) and screw (26) from

boom pivot pin (24). Discard locknut.

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