SkyTrak 8042 Service Manual - Manual (Page 47)

3-9 6036, 6042, 8042, 10042, 10054
Boom
8. Label, disconnect and cap the hydraulic hoses
attached to both slave cylinders (17). Cap all fittings
to keep dirt and debris from entering the hydraulic
system.
9. Support the slave cylinder on the right side of the
machine. Remove the rod end pins securing the
cylinder in position. Move the cylinder to a clean, flat
surface. Repeat this procedure for the left side slave
cylinder.
10. Remove the boom proximity sensor (18) from the
right side boom pivot mounting plate.
11. Securely block up or support the right Lift/Lower
cylinder. Remove the rod end pin. Repeat this
procedure for the left Lift/Lower cylinder.
12. Remove the boom pivot pins (19) to the frame. While
removing the pins, note the location and quantity of
shims between the outer boom and frame.
13. Using a sling or suitable support, carefully lift the first
boom section away from the machine. Set the boom
section down on a hard, level surface. Support the
boom as required to allow removal of the Extend/
Retract cylinder from the underside of the boom.
14. Use a hoist and slings to support the Extend/Retract
cylinder. At the base end of the cylinder, remove a
retaining ring from one side of the cylinder base end
pin.
15. Lower the base end of the Extend/Retract cylinder
and remove the rod end of the cylinder from the
retainer at the front of the boom. Place the Extend/
Retract cylinder on a clean, flat surface.
16. At the front of the first boom section, remove rubber
bumper to the Extend/Retract cylinder retainer.
Inspect the rubber bumper. If it is in good condition,
the rubber bumper can be reused. If the bumper is
showing signs of cracking or deterioration, it should
be replaced.
17. Remove the two yoke plates to the mount at the front
of the boom. Inspect the yoke plates for wear or
distortion. If any wear or distortion is detected, both
plates must be replaced. If no wear is detected, the
plates can remain assembled to the extend chain
clevis.
18. Inspect all wear pads for wear. Refer to Section 3.9,
“Boom Wear Pads.”
3.4.5 First Boom Section Installation
1. On the rear of the boom, assemble the Extend and
Retract bulkhead fittings to the mounting plate on the
right side. Insert the fittings from the bottom up and
secure in place with the bulkhead fitting nuts on the
top side. Tighten securely. Repeat this procedure for
the Attachment Tilt fittings on the left side.
Note: Keep the caps on the threaded ends of the fittings
to protect the threads from damage and to keep dirt and
debris from entering the hydraulic system.
2. If equipped with Auxiliary hydraulics, assemble the
Auxiliary hydraulic bulkhead fittings to the mounting
plate on the left side. Insert the fittings from the
bottom up into the outer set of holes and secure in
place with the bulkhead fitting nuts on the top side.
Tighten securely.
3. Using a sling, position the Extend/Retract cylinder to
its original orientation under the boom.
4. Coat the base end of the cylinder with anti-seize
compound. Insert the base end cylinder pin through
both mounting ears and the base end of the Extend/
Retract cylinder. Secure the pin in place with a
retaining ring on each side of the pin.
5. Lift the rod end of the Extend/Retract cylinder
enough to insert the threaded stud on the rubber
bumper into the hole in the Extend/Retract cylinder
retainer. Secure the rubber bumper in place with a
locknut. Tighten securely. Lower the rod end of the
Extend/Retract cylinder, and allow it to rest on the
rubber bumper.
MH1221
18
MH1241
19