SkyTrak 6036 Service Manual - Manual (Page 46)

Boom
3-4 6036, 6042, 8042, 10042, 10054
3.2 SAFETY INFORMATION
3.3 BOOM SYSTEM - THREE SECTION
(6036, 6042, 8042 & 10042)
3.3.1 Boom System Operation
The three section boom assembly consists of first,
second and third boom section assemblies with double
top boom extend chains and a single retract chain. Boom
extension and retraction is accomplished via hydraulic
power and chain movement.
As the Extend/Retract hydraulic cylinder, which is
anchored at the rear of the second boom section and the
rear of the first boom section, begins to extend, it forces
the second boom section out of the first boom section.
The second and third boom sections are connected by
extend and retract chains. These chains are routed
around sheaves on the second boom section. As the
second boom section is forced out, the extend chain pulls
the third boom section out of the second boom section.
As hydraulic pressure is applied to the retract port on the
Extend/Retract cylinder, the second boom section is
pulled back into the first boom section, and retract chain
pulls the third boom section back into the second section.
This mechanical linkage formed by the chains and
supporting hardware extends and retracts the second
and third boom sections at the same rate.
The first boom section does not extend or retract, but lifts
and lowers via action of the lift/lower cylinder.
3.4 BOOM ASSEMBLY MAINTENANCE
These instructions must be completed in sequence. The
third boom section must be removed before removing the
second boom section. The third and second boom
section must be removed at one time before removing the
first boom section.
Before beginning, conduct a visual inspection of the
machine and work area, and review the task about to be
undertaken. Read, understand and follow these
instructions.
3.4.1 Boom Removal
1. Remove any attachment from quick attach assembly.
Note: If replacing the third section boom, remove the
quick attach from the third section. Refer to Section
3.8.1, “Quick Attach Removal.”
2. Park the machine on a hard, level surface, level the
machine, fully retract the boom, lower the boom,
place the transmission control lever in
(N) NEUTRAL, engage the park brake and shut the
engine OFF.
3. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel, stating that the
machine should not be operated.
4. Open the rear door. Allow the system fluids to cool.
5. Move the Attachment Tilt joystick in both directions
to relieve any trapped pressure in the Attachment Tilt
system. If the machine is equipped with Auxiliary
controls, move the Auxiliary hydraulic joystick in both
directions to relieve any trapped pressure in the
Auxiliary hydraulic system.
6. Properly disconnect the battery.
7. Label, disconnect and cap the hydraulic hoses at the
rear of the boom. Cap all fittings to keep dirt and
debris from entering the hydraulic system.
8. Label and disconnect the boom proximity sensor at
the rear of the boom.
9. Remove the pin from the rod end of the
compensation cylinder being careful not to drop the
cylinder. Lower the cylinder onto the frame rails.
10. Remove the pin from the rod end of the lift/lower
cylinders. Lower the cylinders onto the frame rails.
11. Confirm that the boom assembly is balanced with
the sling and remove the boom assembly
pivot pin.
12. Lift the boom assembly from the machine and lower
onto suitable supports
WARNING
DO NOT service the machine without following all
safety precautions as outlined in the “Safety
Practices” section of this manual.
WARNING
NEVER weld or drill the boom unless approved in
writing by the manufacturer. The structural integrity of
the boom will be impaired if subjected to any repair
involving welding or drilling.