16-12.3. OUTER BOOM - REPLACE/REPAIR (Contd)
In step 2f, release hydraulic joystick immediately after
boom hoist cylinder (8) being removed has fully
retracted. If joystick is allowed to remain open, the other
cylinder (8) will start to retract, putting extreme stress on
lifting equipment and boom.
Start engine and run at full throttle. Fully
retract boom hoist cylinder (8). Cylinder (8)
will retract very slowly. Stop engine.
Carefully lower cylinder (8) onto board
placed across vehicle deck so hydraulic line
on cylinder (7) is not damaged.
Repeat steps 2d through 2g for other
SUPPORT SO THAT OUTER BOOM (3) WILL
BE LEVEL WHEN LOWERED.
CAREFULLY LOWER OUTER BOOM (3) WITH
HOIST AND SLING UNTIL FRONT OF BOOM
(3) IS ON JACKSTAND OR SUPPORT.
REMOVE OUTER BOOM (3) FROM VEHICLE
Center of gravity for outer boom (4) is approximately
92.5 inches from front flange of outer boom (3).
To prevent damage to lines (4) during step 5a, place
wood boards between underside of outer boom (3) and